Activity总结练习

package com.example.wang.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText et_usercode;

    EditText et_password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        et_password=(EditText)findViewById(R.id.et_password);
        et_usercode=(EditText)findViewById(R.id.et_usercode);

    }

    public void zhuce(View v)
    {
        Intent intent=new Intent(this,ZhuceActivity.class);

        startActivityForResult(intent,1);
    }

    String username;
    String usercode;
    String password;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode==1)
        {
            if (resultCode==RESULT_OK)
            {

                 username=data.getStringExtra("name");

                 usercode=data.getStringExtra("code");

                 password=data.getStringExtra("pass");
            }
        }
    }

    public void denglu(View v)
    {
        String et_code=et_usercode.getText().toString();
        String et_pass=et_password.getText().toString();

        if (et_code.trim().length()==0||et_pass.trim().length()==0)
        {
            Toast.makeText(MainActivity.this, "用户名或密码不能为空", Toast.LENGTH_SHORT).show();
            return;
        }

        if (et_code==null||!et_code.equals(usercode))
        {
            Toast.makeText(MainActivity.this, "用户未注册", Toast.LENGTH_SHORT).show();
            return;
        }

        if (et_pass==null||!et_pass.equals(password))
        {
            Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_SHORT).show();
            return;
        }
        else
        {
            Toast.makeText(this,"用户登录成功",Toast.LENGTH_LONG).show();

//传递信息到TestActivity页面
            Intent intent=new Intent(this,TestActivity.class);

            intent.putExtra("code",usercode);

            intent.putExtra("name",username);

            startActivity(intent);

        }

    }
}

MainActivity

package com.example.wang.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class ZhuceActivity extends AppCompatActivity {

    EditText usercode;

    EditText username;

    EditText password;

    Button  bt_quxiao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_zhuce);

        usercode=(EditText)findViewById(R.id.usercode);
        username=(EditText)findViewById(R.id.username);
        password=(EditText)findViewById(R.id.password);

        bt_quxiao=(Button)findViewById(R.id.bt_quxiao);

        bt_quxiao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setResult(RESULT_CANCELED,null);
                finish();
            }
        });
    }

    public void queding(View v)
    {
        String user_name=username.getText().toString();

        if (user_name==null||user_name.trim().length()==0)
        {
            Toast.makeText(ZhuceActivity.this, "请正确输入用户名", Toast.LENGTH_SHORT).show();
            return;
        }

        String user_code=usercode.getText().toString();

        if (user_code==null||user_code.trim().length()==0)
        {
            Toast.makeText(ZhuceActivity.this, "请正确输入用户代码", Toast.LENGTH_SHORT).show();
            return;
        }

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

        if (pass_word==null||pass_word.trim().length()==0)
        {
            Toast.makeText(ZhuceActivity.this, "请正确填写用户密码", Toast.LENGTH_SHORT).show();
            return;
        }

        Intent intent=new Intent();

        intent.putExtra("name",user_name );

        intent.putExtra("code",user_code);

        intent.putExtra("pass",pass_word);

        setResult(RESULT_OK,intent);

        finish();
    }

}

ZhuceActivity

package com.example.wang.myapplication;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class TestActivity extends AppCompatActivity {

    Button bt_1;
    EditText et_1;
    TextView tv_1;
    TextView tv_2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);

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

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

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

//从上一个页面传递信息到本页面
        Intent intent=getIntent();

        String str1=intent.getStringExtra("code");
        String str2=intent.getStringExtra("name");

        tv_1.setText("用户代码："+str1);
        tv_2.setText("用户名称："+str2);

        bt_1=(Button)findViewById(R.id.bt_1);

//间接拨打电话
        bt_1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

//                //方法1
//                String str1=et_1.getText().toString();
//
//                if (str1.trim().length()==0||str1==null)
//                {
//                    Toast.makeText(TestActivity.this, "请正确填写号码", Toast.LENGTH_SHORT).show();
//                    return;
//                }
//
//                Intent intent=new Intent(Intent.ACTION_DIAL);
//
//                intent.setData(Uri.parse("tel:"+str1));
//
//                startActivity(intent);

                //方法2 调用getphone()方法

                String phone=getphone();

                if (phone==null) return;

                Intent intent=new Intent(Intent.ACTION_DIAL);

                intent.setData(Uri.parse("tel:"+phone));

                startActivity(intent);

            }
        });
    }
//由于方法重复使用，定义一个方法
    public String getphone()
    {
        String phone=et_1.getText().toString();

        if (phone.trim().length()==0||phone==null)
        {
            Toast.makeText(TestActivity.this, "请正确填写号码", Toast.LENGTH_SHORT).show();
            return null;
        }
        else
        {
            return phone;
        }

    }

//直接拨打电话方法
    public void zhibo(View v)
    {
        String phone=getphone();

        if (phone==null) return;

        Intent intent=new Intent(Intent.ACTION_CALL);

        intent.setData(Uri.parse("tel:" + phone));

        try {
            startActivity(intent);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finish();

    }
}

TestActivity

<?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.wang.myapplication.MainActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="用户代码"
        android:id="@+id/et_usercode"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="密码"
        android:layout_below="@id/et_usercode"
        android:id="@+id/et_password"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/et_password">
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="登陆"
            android:id="@+id/bt_denglu"
            android:onClick="denglu"
            android:layout_weight="1"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="注册"
            android:id="@+id/bt_zhuce"
            android:onClick="zhuce"
            android:layout_weight="1"/>
    </LinearLayout>

</RelativeLayout>

activity_main

<?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"
    android:layout_margin="16dp"
    android:orientation="vertical"
  >

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="用户代码"
        android:id="@+id/usercode"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="用户名称"
        android:id="@+id/username"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="密码"
        android:id="@+id/password"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="取消"
            android:id="@+id/bt_quxiao"
            android:layout_weight="1"/>
        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="确定"
            android:id="@+id/bt_queding"
            android:layout_weight="1"
            android:onClick="queding"/>
    </LinearLayout>

</LinearLayout>

activity_zhuce

<?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"
    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.wang.myapplication.TestActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:id="@+id/tv_1" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:id="@+id/tv_2" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:layout_width="170dp"
            android:layout_height="wrap_content"
            android:hint="电话号码"
            android:inputType="phone"
            android:id="@+id/et_1"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="间接拨打"
            android:id="@+id/bt_1"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="直接拨打"
            android:id="@+id/bt_2"
            android:onClick="zhibo"/>

    </LinearLayout>

</LinearLayout>

activity_test

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