Android——用对话框做登陆界面(自定义对话框AlertDialog，多线程，进度条ProgressDialog，ListView，GridView，SharedPreferences存，读数据，存取文本，assets文件)

效果：

1.点击图标进入页面二

2.页面2图片暂停显示5秒进入页面三

3.点击页面三登陆按钮，打开登陆对话框，输入密码进入页面四

点击下载按钮，显示水平进度条

点击保存和获取用户名和密码进入页面六操作SharedPreferences

点击文本和文件进入页面八

4.页面四是一个用BaseAdapt适配器加载的ListView,点击相册行时，跳转至页面五

点击地图时，跳转值页面七，gridview视图（图+字）

5.页面五是一个用GridView建的网格视图（图）

6.页面六操作SharedPreferences

7.页面八，操作文本和文件的保存和获取

MainActivity.java

package com.example.chenshuai.test404;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    public void onclick(View view)

    {

        Intent intent = new Intent(this,Activity1.class);

        startActivity(intent);

    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="com.example.chenshuai.test404.MainActivity">

   <ImageButton

       android:layout_width="90dp"

       android:layout_height="90dp"

       android:src="@drawable/logo"

       android:onClick="onclick"/>

</RelativeLayout>

Activity1.java

package com.example.chenshuai.test404;

import android.content.Intent;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import java.util.Timer;

import java.util.TimerTask;

/**

 * Created by chenshuai on 2016/4/3.

 */

public class Activity1 extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity1_layout);

        //图片暂停5秒后显示

        final Intent it = new Intent(this, Activity2.class); //你要转向的Activity

        Timer timer = new Timer();

        TimerTask task = new TimerTask() {

            @Override

            public void run() {

                startActivity(it); //执行

            }

        };

        timer.schedule(task, 1000 * 5); //5秒后

    }

}

activity1_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:background="@drawable/denglu"/>

</LinearLayout>

Activity2.java

package com.example.chenshuai.test404;

import android.app.AlertDialog;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

/**

 * Created by chenshuai on 2016/4/3.

 */

public class Activity2 extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity2_layout);

    }

    public void onclik1(View view)

    {

        //获取加载器

        LayoutInflater layoutInflater = getLayoutInflater();

        //加载layout文件

        View vi_1 = layoutInflater.inflate(R.layout.login_layout,null);

        //添加按钮

        new AlertDialog.Builder(this)

                .setView(vi_1)

                .setNegativeButton("取消", null)

                .setPositiveButton("登陆", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int which) {

                        AlertDialog al = (AlertDialog) dialog;

                        EditText pwd = (EditText) al.findViewById(R.id.pwd);

                        String str = pwd.getText().toString();

                        if (str.equals("123")) {

                            Intent intent = new Intent(Activity2.this, Activity3.class);

                            startActivity(intent);

                        } else {

                            Toast.makeText(Activity2.this, "密码错误！", Toast.LENGTH_SHORT).show();

                        }

                    }

                })

                .show();

    }

    public void onclick2(View v)

    {

        final ProgressDialog pd = new ProgressDialog(this);

        pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

        pd.setMessage("下载进度");

        pd.show();

        //创建thread实例  重写run方法  启动多线程

        new Thread()

        {

            @Override

            public void run() {

                super.run();

                for (int i = 0;i<=pd.getMax();i++)

                {

                    try {

                        Thread.sleep(100);

                    }catch (Exception e)

                    {}

                    pd.setProgress(i);

                }

                pd.dismiss();

            }

        }.start();

    }

    public void onclick3(View view)

    {

        Intent intent = new Intent(this,Activity5.class);

        startActivity(intent);

    }

    public void onclick4(View view)

    {

        Intent intent = new Intent(this,Activity7.class);

        startActivity(intent);

    }

}

activity2_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:background="@drawable/anniu1"

        android:text="点击登陆"

        android:textSize="20dp"

        android:onClick="onclik1"

        />

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:background="@drawable/anniu2"

        android:text="点击下载文件"

        android:textSize="20dp"

        android:onClick="onclick2"

        />

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="点击保存用户名和密码 key/value"

        android:textSize="20dp"

        android:background="@drawable/anniu13"

        android:onClick="onclick3"/>

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="点击文本和文件"

        android:textSize="20dp"

        android:background="@drawable/anniu1"

        android:onClick="onclick4"/>

</LinearLayout>

login_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <ImageView

        android:layout_width="90dp"

        android:layout_height="90dp"

        android:src="@drawable/touxiang"

        android:layout_marginTop="100dp"

        android:layout_gravity="center_horizontal"/>

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="15275969278"

        android:textSize="20dp"

        android:layout_gravity="center_horizontal"

        android:layout_marginTop="10dp"

        />

    <EditText

        android:layout_width="350dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:hint="请填写密码"

       android:inputType="textPassword"

        android:drawableLeft="@drawable/suo1"

        android:layout_marginTop="20dp"

        android:id="@+id/pwd"

     />

</LinearLayout>

Activity3.java

package com.example.chenshuai.test404;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;

import java.util.ArrayList;

import java.util.List;

/**

 * Created by chenshuai on 2016/4/4.

 */

public class Activity3 extends Activity {

    List<Biaozhi> bz;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.base_layout);

        ListView base_1 = (ListView)findViewById(R.id.base_1);

        bz = new ArrayList<Biaozhi>();

        bz.add(new Biaozhi(R.drawable.dazhong,"大众点评"));

        bz.add(new Biaozhi(R.drawable.gallery,"相册"));

        bz.add(new Biaozhi(R.drawable.maps,"地图"));

        bz.add(new Biaozhi(R.drawable.mm,"聊天"));

        bz.add(new Biaozhi(R.drawable.netease,"网易新闻"));

        bz.add(new Biaozhi(R.drawable.qq,"QQ"));

        bz.add(new Biaozhi(R.drawable.settings,"设置"));

        bz.add(new Biaozhi(R.drawable.sinaweibo,"新浪微博"));

        bz.add(new Biaozhi(R.drawable.stormsmart,"暴风影音"));

        bz.add(new Biaozhi(R.drawable.taobao,"淘宝"));

        bz.add(new Biaozhi(R.drawable.videoplayer,"视频"));

        base_1.setAdapter(new mybaseadapt());

        base_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                if (position == 1)

                {

                    Intent in = new Intent(Activity3.this,Activity4.class);

                    startActivity(in);

                }

                if (position ==2)

                {

                    Intent in = new Intent(Activity3.this,Activity6.class);

                    startActivity(in);

                }

            }

        });

    }

    //抽象类 要继承并实现抽象方法后才能使用

    class mybaseadapt extends BaseAdapter{

        @Override

        public int getCount() {

            return bz.size();

        }

        @Override

        public Object getItem(int position) {

            return bz.get(position);

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        //通过getView来实现Listview

        //给视图适配数据返回view视图

        //position 数据的下标（第几个视图）

        //convertView 可重复使用的视图

        //parent 父视图

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            //如果convertView为null，就加载layout文件

            if (convertView == null)

            {

                //1.获取layout文件  用加载器

                LayoutInflater inflater = getLayoutInflater();

                convertView = inflater.inflate(R.layout.activity3_layout,null);

            }

            //2.把数据放入layout文件中  数据和layout文件的视图组件进行绑定

            //（1）从数据源里根据position获取数据

            Biaozhi biaozhi = bz.get(position);

            //（2）获取layout文件的视图组件

            ImageView iv_1 = (ImageView)convertView.findViewById(R.id.iv_1);

            TextView tv_1 = (TextView)convertView.findViewById(R.id.tv_1);

            //(3)绑定  数据适配

            iv_1.setImageResource(biaozhi.getImage());

            tv_1.setText(biaozhi.getName());

            //3.返回视图

            return convertView;

        }

    }

}

base_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<ListView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:id="@+id/base_1">

</ListView>

activity3_layout.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_marginTop="20dp">

    <ImageView

        android:layout_width="80dp"

        android:layout_height="80dp"

        android:src="@drawable/logo"

        android:id="@+id/iv_1"/>

    <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        android:layout_gravity="center_vertical"

        android:paddingLeft="20dp">

        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="微信"

            android:textSize="20dp"

            android:id="@+id/tv_1"/>

    </LinearLayout>

</LinearLayout>

Activity4.java

package com.example.chenshuai.test404;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

public class Activity4 extends AppCompatActivity {

    int img[] = {R.drawable.dazhong,R.drawable.gallery,R.drawable.maps,R.drawable.mm,

                 R.drawable.qq,R.drawable.settings,R.drawable.sinaweibo,R.drawable.netease,

                 R.drawable.stormsmart,R.drawable.torchactivity,R.drawable.videoplayer};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_4);

        GridView grv_1 = (GridView)findViewById(R.id.grv_1);

        grv_1.setAdapter(new mygridview());

    }

    class mygridview extends BaseAdapter{

        @Override

        public int getCount() {

            return img.length;

        }

        @Override

        public Object getItem(int position) {

            return img[position];

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            //先取数据

            int imageid = img[position];

            //直接构造视图

            ImageView imageView =null;

            if (convertView == null)

            {

                imageView = new ImageView(Activity4.this);

                imageView.setLayoutParams(new GridView.LayoutParams(200,200));

            }

            else

            {

                imageView=(ImageView)convertView;

            }

            //给视图绑定数据

            imageView.setImageResource(imageid);

            return imageView;

        }

    }

}

activity_4.xml

<?xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:numColumns="4"

    android:verticalSpacing="10dp"

    android:gravity="center"

    android:stretchMode="columnWidth"

    android:id="@+id/grv_1"

    >

</GridView>

Activity5.java

package com.example.chenshuai.test404;

import android.content.SharedPreferences;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class Activity5 extends AppCompatActivity {

    EditText user;

    EditText pwd;

    SharedPreferences sp;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_5);

         user = (EditText)findViewById(R.id.user);

         pwd = (EditText)findViewById(R.id.pwd);

        //1.获取sp的实例

        sp = getSharedPreferences("mydata",MODE_PRIVATE);

    }

    //保存

    public void baocunclick(View view)

    {

        //1.获取数据

        String username = user.getText().toString();

        String password = pwd.getText().toString();

        //判断不为空

        if (username.length() == 0 || password.length() ==0)

        {

            Toast.makeText(Activity5.this, "用户名和密码不为空", Toast.LENGTH_SHORT).show();

        }

        else

        {

            //2.用Editor存储数据

            //获取Editor

            SharedPreferences.Editor editor_1 = sp.edit();

            //3.往编辑器里放数据(从上面获取的数据)

            editor_1.putString(username,password);

            //4.提交保存

            boolean b = editor_1.commit();

            if (b)

            {

                Toast.makeText(Activity5.this, "保存成功", Toast.LENGTH_SHORT).show();

            }

            else

            {

                Toast.makeText(Activity5.this, "保存失败", Toast.LENGTH_SHORT).show();

            }

        }

    }

    //获取

    public void huoquclick(View view)

    {

        //1.获取要读的key；

        String key = user.getText().toString();

        //2.将通过用户名读取的密码放入第二个Edittext

        pwd.setText(sp.getString(key,"没有发现用户名"));

    }

}

activity_5.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.example.chenshuai.test404.Activity5"

    android:orientation="vertical">

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="用户名："

        android:id="@+id/user"/>

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="密码："

        android:id="@+id/pwd"/>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content">

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="保存"

            android:id="@+id/baocun"

            android:onClick="baocunclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="获取"

            android:id="@+id/huoqu"

            android:onClick="huoquclick"/>

    </LinearLayout>

</LinearLayout>

Activity6.java

package com.example.chenshuai.test404;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

import java.util.ArrayList;

import java.util.List;

public class Activity6 extends AppCompatActivity {

    List<Biaozhi> bz;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_6);

        GridView gv_1 = (GridView)findViewById(R.id.gv_1);

        bz = new ArrayList<Biaozhi>();

        bz.add(new Biaozhi(R.drawable.dazhong,"大众点评"));

        bz.add(new Biaozhi(R.drawable.gallery,"相册"));

        bz.add(new Biaozhi(R.drawable.maps,"地图"));

        bz.add(new Biaozhi(R.drawable.mm,"聊天"));

        bz.add(new Biaozhi(R.drawable.netease,"网易新闻"));

        bz.add(new Biaozhi(R.drawable.qq,"QQ"));

        bz.add(new Biaozhi(R.drawable.settings,"设置"));

        bz.add(new Biaozhi(R.drawable.sinaweibo, "新浪微博"));

        bz.add(new Biaozhi(R.drawable.stormsmart, "暴风影音"));

        bz.add(new Biaozhi(R.drawable.taobao,"淘宝"));

        bz.add(new Biaozhi(R.drawable.videoplayer,"视频"));

        gv_1.setAdapter(new grid_baseadapter());

    }

    //抽象类 要继承并实现抽象方法后才能使用

    class grid_baseadapter extends BaseAdapter

    {

        @Override

        public int getCount() {

            return bz.size();

        }

        @Override

        public Object getItem(int position) {

            return bz.get(position);

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

        //通过getView来实现Listview

        //给视图适配数据返回view视图

        //position 数据的下标（第几个视图）

        //convertView 可重复使用的视图

        //parent 父视图

        @Override

        public View getView(int position, View convertView, ViewGroup parent) {

            //如果convertView为null，就加载layout文件

            if (convertView == null)

            {

                //1.获取layout文件  用加载器

                LayoutInflater inflater = getLayoutInflater();

                convertView = inflater.inflate(R.layout.layout_6_1,null);

            }

            //2.把数据放入layout文件中  数据和layout文件的视图组件进行绑定

            //（1）从数据源里根据position获取数据

            Biaozhi biaozhi = bz.get(position);

            //（2）获取layout文件的视图组件

            ImageView iv_2 = (ImageView)convertView.findViewById(R.id.iv_2);

            TextView tv_2 = (TextView)convertView.findViewById(R.id.tv_2);

            //(3)绑定  数据适配

            iv_2.setImageResource(biaozhi.getImage());

            tv_2.setText(biaozhi.getName());

            //3.返回视图

            return convertView;

        }

    }

}

Biaozhi.java

package com.example.chenshuai.test404;

/**

 * Created by chenshuai on 2016/4/7.

 */

public class Biaozhi {

    private int image;

    private String name;

    public int getImage() {

        return image;

    }

    public String getName() {

        return name;

    }

    public void setImage(int image) {

        this.image = image;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Biaozhi(int image, String name) {

        this.image = image;

        this.name = name;

    }

    public Biaozhi()

    {

    }

    @Override

    public String toString() {

        return "Biaozhi{" +

                "image=" + image +

                ", name='" + name + '\'' +

                '}';

    }

}

Activity_6.xml

<?xml version="1.0" encoding="utf-8"?>

<GridView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:id="@+id/gv_1"

    android:numColumns="4"

    android:verticalSpacing="10dp"

    android:stretchMode="columnWidth"

   >

</GridView>

Activity_6_1.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <ImageView

        android:layout_width="120dp"

        android:layout_height="120dp"

        android:src="@drawable/dazhong"

        android:id="@+id/iv_2"/>

    <TextView

        android:layout_width="120dp"

        android:layout_height="wrap_content"

        android:text="大众点评"

        android:textSize="20dp"

        android:gravity="center"

        android:id="@+id/tv_2"/>

</LinearLayout>

Activity7.java

package com.example.chenshuai.test404;

import android.content.res.AssetManager;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.Toast;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.PrintStream;

public class Activity7 extends AppCompatActivity {

    EditText et_1;

    EditText et_2;

    ImageView iv_3;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_7);

        et_1 = (EditText)findViewById(R.id.et_1);

        et_2 = (EditText)findViewById(R.id.et_2);

        iv_3 = (ImageView)findViewById(R.id.iv_3);

    }

    final String FILENAME = "text.txt";

    public void baocunwenben_onclick(View view)

    {

        //1.获取要存储的内容

        String content = et_1.getText().toString();

        //2.获取输出流 以数据为基准 从手机存储往文件走为输出流

        try {

            //追加模式

            FileOutputStream fos = openFileOutput(FILENAME,MODE_APPEND);

            //3.构造打印流 PrintStream

            PrintStream ps = new PrintStream(fos);

            //4.写入内容（换行）

            ps.println(content);

            //5.关闭

            ps.close();

            fos.close();

            Toast.makeText(Activity7.this, "保存成功", Toast.LENGTH_SHORT).show();

        } catch (Exception e) {

            e.printStackTrace();

            Toast.makeText(Activity7.this, "保存失败", Toast.LENGTH_SHORT).show();

        }

    }

    //获取

    public void huoquwenben_onclick(View view)

    {

        //1.获取输入流  从文件到手机存储

        try {

            FileInputStream fis = openFileInput(FILENAME);

            //2.用数组方法读取

            //定义读取的数组

            byte[] b = new byte[1024];

            //3.读出的数据的长度

            int i = 0;

            StringBuilder sbr = new StringBuilder();

            //fis.read(b)返回长度

            while ((i = fis.read(b))>0)

            {

                //在这里需要字符串，转为字符串

                sbr.append(new String(b,0,i));

            }

            fis.close();

            et_2.setText(sbr);

            Toast.makeText(Activity7.this, "读取成功", Toast.LENGTH_SHORT).show();

        } catch (Exception e) {

            e.printStackTrace();

            Toast.makeText(Activity7.this, "读取失败", Toast.LENGTH_SHORT).show();

        }

    }

    //操作assets内的文件

    public void baocuntupianwj_onclick(View view)

    {

        //1.获取AssetManager

        AssetManager assetManager = getAssets();

        //2.打开文件  返回输入流 把文件读到内存里

        try {

            InputStream is = assetManager.open("zixingche.jpg");

            //3.获取输出流

            FileOutputStream fos = openFileOutput("zixingche2.jpg",MODE_PRIVATE);

            //4.边读边写

            byte[] b =new byte[1024];

            int i = 0;

            while((i = is.read(b))>0)

            {

                fos.write(b, 0, i);

            }

            fos.close();

            is.close();

            Toast.makeText(Activity7.this, "保存成功", Toast.LENGTH_SHORT).show();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    //读取文件 从手机内部存储读图片文件

    public void huoqutupianwj_onclick(View view)

    {

        //改变ImageView的图片来源，指向手机存储空间

        //1.获取文件存储的绝对路径

        String filepath  = getFilesDir().getAbsolutePath();

        //2.组合完整路径

        filepath += "/zixingche2.jpg";

        Toast.makeText(Activity7.this, "path= "+filepath, Toast.LENGTH_SHORT).show();

        //3.生成位图实例

        Bitmap bm = BitmapFactory.decodeFile(filepath);

        //4.改变ImageView的图片来源 显示图片

        iv_3.setImageBitmap(bm);

    }

}

Activity_7.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    >

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="输入要保存的文本"

        android:id="@+id/et_1"/>

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:hint="显示保存的文本"

        android:id="@+id/et_2"/>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <Button

            android:layout_width="0dp"

            android:layout_height="match_parent"

            android:text="点击保存文本"

            android:layout_weight="1"

            android:onClick="baocunwenben_onclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="match_parent"

            android:text="点击获取文本"

            android:layout_weight="1"

            android:onClick="huoquwenben_onclick"/>

    </LinearLayout>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal">

        <Button

            android:layout_width="0dp"

            android:layout_height="match_parent"

            android:text="点击保存图片文件"

            android:layout_weight="1"

            android:onClick="baocuntupianwj_onclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="match_parent"

            android:text="点击获取图片文件"

            android:layout_weight="1"

            android:onClick="huoqutupianwj_onclick"/>

    </LinearLayout>

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/touxiang"

        android:layout_gravity="center"

        android:id="@+id/iv_3"

        />

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.chenshuai.test404">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity1">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity2">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity3">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity4">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity5">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity6">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

        <activity android:name=".Activity7">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>

        </activity>

    </application>

</manifest>

AndroidManifest.xml

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