android 数据存储----android短信发送器之文件的读写（手机+SD卡）

本文实践知识点有有三：

1.布局文件，android布局有相对布局，线性布局，绝对布局，表格布局，标签布局等。各个布局能够嵌套的。本文的布局文件就是线性布局的嵌套

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

         android:layout_width="fill_parent"

          android:layout_height="fill_parent"

          android:orientation="vertical">

          <TextView

              android:layout_width="fill_parent"

              android:layout_height="wrap_content"

              android:text="@string/Telhint"

              android:textSize="19sp"

              android:textColor="#FFFFFF"

              android:background="#000000"

              />

          <EditText

              android:id="@+id/Tel"

              android:inputType="number"

              android:layout_width="fill_parent"

              android:layout_height="75sp"

             android:textSize="30sp"

             android:paddingLeft="10sp"

              android:paddingRight="10sp"

             android:background="@drawable/text1"

              />

          <TextView

              android:layout_width="fill_parent"

              android:layout_height="wrap_content"

              android:text="@string/Smshint"

              android:textSize="19sp"

               android:textColor="#FFFFFF"

              android:background="#000000"

              />

             <EditText

              android:id="@+id/Sms"

              android:inputType="textMultiLine"

              android:layout_width="fill_parent"

              android:layout_height="180dip"

              android:textSize="19sp"

              android:minLines="10"

              android:gravity="left"

              android:background="@drawable/text2"

              android:paddingTop="19sp"

               android:paddingBottom="22sp"

              android:paddingLeft="22sp"

              android:paddingRight="15sp"

              />

        <LinearLayout

             android:layout_width="fill_parent"

             android:layout_height="wrap_content"

             android:orientation="horizontal">

             <Button

              android:layout_marginTop="10sp"

              android:layout_marginLeft="3sp"

              android:id="@+id/button0"

              android:layout_width="wrap_content"

              android:layout_height="75sp"

              android:text="@string/send"

              android:textColor="#7cfc00"

              android:textSize="19sp"

              />

             <Button

                 android:id="@+id/button1"

                 android:layout_width="wrap_content"

                 android:layout_height="75sp"

                 android:layout_marginTop="10sp"

                  android:layout_marginLeft="3sp"

                 android:text="@string/savephone"

                 android:textColor="#800080"

                 android:textSize="19sp" />

              <Button

                 android:id="@+id/button6"

                 android:layout_marginTop="10sp"

                 android:layout_width="wrap_content"

                 android:layout_height="75sp"

                  android:layout_marginLeft="3sp"

                 android:text="@string/savecache"

                 android:textColor="#800080"

                 android:textSize="19sp" />

              <Button

                  android:id="@+id/button10"

                  android:layout_width="wrap_content"

                  android:layout_height="75sp"

                 android:layout_marginTop="5sp"

                  android:layout_marginLeft="1sp"

                  android:layout_gravity="center"

                   android:text="@string/deletecache"

                  android:textColor="#800080"

                  android:textSize="19sp" />

           </LinearLayout>

         <LinearLayout

             android:layout_width="fill_parent"

             android:layout_height="wrap_content"

             android:orientation="horizontal">

             <Button

               android:layout_marginTop="10sp"

               android:layout_marginLeft="3sp"

              android:id="@+id/button2"

              android:layout_width="wrap_content"

              android:layout_height="75sp"

              android:text="@string/clear"

              android:textColor="#ff0000"

              android:textSize="19sp"

              />

              <Button

               android:layout_marginTop="10sp"

              android:layout_marginLeft="3sp"

              android:id="@+id/button3"

              android:layout_width="wrap_content"

              android:layout_height="75sp"

              android:text="@string/savesdcard"

              android:textColor="#800080"

              android:textSize="19sp"

                />

               <Button

               android:layout_marginTop="10sp"

              android:layout_marginLeft="3sp"

              android:id="@+id/button7"

              android:layout_width="wrap_content"

              android:layout_height="75sp"

              android:text="@string/Readcache"

              android:textColor="#800080"

              android:textSize="19sp"

                />

                 <Button

               android:id="@+id/button11"

               android:layout_width="wrap_content"

              android:layout_height="75sp"

              android:text="@string/future"

              android:layout_marginTop="2sp"

              android:layout_marginLeft="1sp"

              android:gravity="center"

              android:textColor="#800080"

              android:textSize="19sp" />

         </LinearLayout>

            <LinearLayout

             android:layout_width="fill_parent"

             android:layout_height="wrap_content"

             android:orientation="horizontal"> 

             <Button

                 android:id="@+id/button4"

                 android:layout_width="90dp"

                 android:layout_height="wrap_content"

                 android:layout_marginTop="10sp"

              android:layout_marginLeft="1sp"

                 android:text="@string/Readphone"

                 android:textColor="#0000ff"

                 android:textSize="19sp" />

             <Button

                 android:id="@+id/button5"

                 android:layout_width="90dp"

                 android:layout_height="wrap_content"

                  android:layout_marginTop="10sp"

              android:layout_marginLeft="1sp"

                 android:text="@string/Readsdcard"

                 android:textColor="#0000ff"

                 android:textSize="19sp" />

             <Button

                 android:id="@+id/button8"

                 android:layout_width="90dp"

                 android:layout_height="wrap_content"

                  android:layout_marginTop="10sp"

              android:layout_marginLeft="1sp"

                 android:text="@string/deletephone"

                 android:textColor="#0000ff"

                 android:textSize="19sp" />

               <Button

                 android:id="@+id/button9"

                 android:layout_width="wrap_content"

                 android:layout_height="wrap_content"

                 android:layout_marginTop="10sp"

              android:layout_marginLeft="1sp"

                 android:text="@string/deletesd"

                 android:textColor="#0000ff"

                 android:textSize="19sp" />

         </LinearLayout>

    </LinearLayout>

l
2.布局文件里使用字符以及Java源码中使用的字符最好在string.xml先定义，然后再引用

<?

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

<resources>

    <string name="app_name">MySMS</string>

    <string name="Telhint">请输入号码：</string>

    <string name="Smshint">请输入短信内容：</string>

     <string name="send">发送</string>

     <string name="OK">发送成功</string>

     <string name="savephone">to-手机</string>

     <string name="savesdcard">to-SD卡</string>

      <string name="ReadSD">读SD卡信息</string>

       <string name="clear">清除</string>

      <string name="action_settings">Settings</string>

          <string name="Readphone">读手机短信</string>

     <string name="Readsdcard">读sd卡短信</string>

      <string name="future"> --NULL-- </string>

      <string name="savecache">to-cache</string>

      <string name="Readcache">读cache</string>

     <string name="deletephone">删手机短信</string>

      <string name="deletesd">删sd卡短信</string>

       <string name="deletecache">C-Cache</string>

</resources>

3.涉及的安全方面的业务。必需在androidMainifest.xml注冊，如发送短信，拨打电话。读取SD卡数据等

<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>"

当中当中竖屏翻转，也须要在这里注冊

android:screenOrientation="portrait"

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

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

    package="com.example.mysms"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="19" />

  <uses-permission android:name="android.permission.SEND_SMS"/>

   <uses-permission  android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

   <uses-permission  android:name="android.permission.READ_EXTERNAL_STORAGE"/>

       <uses-permission  android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>"

    <application

        android:allowBackup="true"

        android:icon="@drawable/sms"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" 

        >

        <activity

            android:name="com.example.mysms.MainActivity"

            android:label="@string/app_name"

            android:screenOrientation="portrait"

            >

            <intent-filter>

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

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

            </intent-filter>

        </activity>

    </application>

</manifest>

4.操作文件的功能实现最好新建一个业务类

package com.example.FileService;

import android.content.Context;

import android.os.Environment;

import android.util.Log;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

public class Fileservice {

	private Context context;

	public Fileservice(Context context) {

		this.context = context;

	}

	private final String tag ="mytag";

    public void SavefileToPhone(String filename,String content) throws Exception

    {

    	Log.e(tag, "hello,start save file to phone internal");

       	FileOutputStream outStream = context.openFileOutput(filename, Context.MODE_PRIVATE);

    	Log.e(tag, "hello,open file is ok");

    	outStream.write(content.getBytes());

    	outStream.close();

    }

    public void SavefileToCache(String filename,String content) throws Exception

    {

       File cachedir = context.getCacheDir();

       File file=new File(cachedir,filename);

       OutputStream os = new FileOutputStream(file);

       os.write(content.getBytes());

       os.close();

    }

    public void SavefileToSD(String filename,String content) throws Exception

    {

    	Log.e(tag,"SD card is begint!");

       File path= Environment.getExternalStorageDirectory();

       Log.e(tag,"SD card save is start!");

       File file=new File(path,filename);

       Log.e(tag,"SD card file  is creat!");

       OutputStream os = new FileOutputStream(file);

       Log.e(tag,"SD card outputstream is get!");

       os.write(content.getBytes());

       Log.e(tag,"SD card is write!");

       os.close();

    }

    public String ReadfileToSD(String filename) throws Exception

    {

       File path= Environment.getExternalStorageDirectory();

       int len = 0;

       byte[] buffer = new byte[1024];

       Log.e(tag, "hello,Read cache file begin");

       File file=new File(path,filename);

       Log.e(tag, "hello,get a file string");

       ByteArrayOutputStream outStream = new ByteArrayOutputStream();

       Log.e(tag, "hello,get a outstream");

       FileInputStream InputStream = new FileInputStream(file);

       Log.e(tag, "hello,get a Inputstream");

   	while((len=InputStream.read(buffer))!=-1)

   	{

   		outStream.write(buffer, 0, len);

   	}

   	byte[] data=outStream.toByteArray();

   	InputStream.close();

   	return new String (data);

    }

    public String ReadfileFromcache(String filename) throws Exception

    {

    int len = 0;

    byte[] buffer = new byte[1024];

    File cachedir = context.getCacheDir();

    Log.e(tag, "hello,Read cache file begin");

    File file=new File(cachedir,filename);

    Log.e(tag, "hello,get a file string");

    ByteArrayOutputStream outStream = new ByteArrayOutputStream();

    Log.e(tag, "hello,get a outstream");

    FileInputStream InputStream = new FileInputStream(file);

    Log.e(tag, "hello,get a Inputstream");

	while((len=InputStream.read(buffer))!=-1)

	{

		outStream.write(buffer, 0, len);

	}

	byte[] data=outStream.toByteArray();

	InputStream.close();

	return new String (data);

    }

    public String ReadfileFromPhone(String file) throws Exception

    {

    	int len = 0;

    	byte[] buffer = new byte[1024];

    	ByteArrayOutputStream outStream = new ByteArrayOutputStream();

    	FileInputStream InputStream= context.openFileInput(file);

    	while((len=InputStream.read(buffer))!=-1)

    	{

    		outStream.write(buffer, 0, len);

    	}

    	byte[] data=outStream.toByteArray();

    	return new String (data);

    }

}

注意android操作文件有两种方式：

一。

使用context类，context提供了输入输出流接口，一般用于读写手机内部文件

二。.使用file类。这个是更顶层的类。通过文件路径和文件名称。能够用于读写系统不论什么地方的文件，一般用于读写cache。SD卡。其它路径文件。

5.activity类，用于GUI操作

package com.example.mysms;

import java.io.File;

import java.util.ArrayList;

import com.example.FileService.Fileservice;

import android.support.v7.app.ActionBarActivity;

import android.telephony.SmsManager;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import android.view.View.OnClickListener;

import android.os.Bundle;

import android.os.Environment;

public class MainActivity extends ActionBarActivity {

	 EditText text1;

	 EditText text2;

	Button bt,bt1,bt2,bt3,bt4,bt5,bt6,bt7,bt8,bt9,bt10;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

         text1=(EditText)findViewById(R.id.Tel);

         text2=(EditText)findViewById(R.id.Sms); 

         bt=(Button)findViewById(R.id.button0);

         bt1=(Button)findViewById(R.id.button1);

         bt2=(Button)findViewById(R.id.button2);

         bt3=(Button)findViewById(R.id.button3);

         bt4=(Button)findViewById(R.id.button4);

         bt5=(Button)findViewById(R.id.button5);

         bt6=(Button)findViewById(R.id.button6);

         bt7=(Button)findViewById(R.id.button7);

         bt8=(Button)findViewById(R.id.button8);

         bt9=(Button)findViewById(R.id.button9);

         bt10=(Button)findViewById(R.id.button10);

         bt.setOnClickListener(listener);

         bt1.setOnClickListener(listener);

         bt2.setOnClickListener(listener);

         bt3.setOnClickListener(listener);

         bt4.setOnClickListener(listener);

         bt5.setOnClickListener(listener);

         bt6.setOnClickListener(listener);

         bt7.setOnClickListener(listener);

         bt8.setOnClickListener(listener);

         bt9.setOnClickListener(listener);

         bt10.setOnClickListener(listener);

    }

    private OnClickListener listener =new OnClickListener()

    {

       String Tel;

       String Sms;

       String filename ;

       private final String Tag=new String("Activity_tag");

		@Override

		public void onClick(View v) {

			Button btx=(Button)v;

			switch(btx.getId())

			{

			case R.id.button0:

				Tel=text1.getText().toString();

				Sms = text2.getText().toString();

				if(Tel.equals("")==true)

				{

			    Toast.makeText(MainActivity.this, "请输入号码！", Toast.LENGTH_LONG).show();

				return;

				}

				if(Sms.equals("")==true)

				{

					Toast.makeText(MainActivity.this, "请输入信息。", Toast.LENGTH_LONG).show();

					return;

				}

			    SmsManager smsm=SmsManager.getDefault();

			    ArrayList<String> texts=smsm.divideMessage(Sms);

			    for(String text:texts)

			    {

			    	smsm.sendTextMessage(Tel, null, text, null, null);

			    }

			    text1.setText("");

			    text2.setText("");

			    Toast.makeText(MainActivity.this, R.string.OK, Toast.LENGTH_LONG).show();

			    break;

			case R.id.button1:

				Tel=text1.getText().toString();

				Sms = text2.getText().toString();

				filename = Tel+".txt";

				Fileservice savetophone = new Fileservice(getApplicationContext());

				try

				{

					savetophone.SavefileToPhone(filename, Sms);

				    Toast.makeText(getApplicationContext(), "保存到手机成功", Toast.LENGTH_SHORT).show();

					Toast.makeText(getApplicationContext(), "文件路径为"+getApplicationContext().getFilesDir().toString(), Toast.LENGTH_SHORT).show();

				}

				catch(Exception e)

				{

					Toast.makeText(getApplicationContext(), "保存到手机失败", Toast.LENGTH_SHORT).show();

				}

				break;

			case R.id.button2:

				text2.setText("");

				Toast.makeText(getApplicationContext(), "清除成功", Toast.LENGTH_SHORT).show();

				break;

			case R.id.button3:

				Tel=text1.getText().toString();

				Sms = text2.getText().toString();

                filename = Tel+".txt";

                Fileservice service3 = new Fileservice(getApplicationContext());

                try

                {

                	if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))

                	{

                		 service3.SavefileToSD(filename, Sms);

                		 File path= Environment.getExternalStorageDirectory();

                	     String PATH = path.toString();

                	   	Toast.makeText(getApplicationContext(), "保存SD卡中的短信成功", Toast.LENGTH_SHORT).show();

                	   	Toast.makeText(getApplicationContext(), "SD卡路径为"+PATH, Toast.LENGTH_SHORT).show();

                	}

                	else

                	{

                		Toast.makeText(getApplicationContext(), "SD卡无法识别", Toast.LENGTH_SHORT).show();

                	}

                }

                catch(Exception e)

                {

                	Toast.makeText(getApplicationContext(), "保存SD卡中的短信失败", Toast.LENGTH_SHORT).show();

                }

				break;

			case R.id.button4:

				Tel=text1.getText().toString();

				filename = Tel+".txt";

				Fileservice service = new Fileservice(getApplicationContext());

				try

				{   Sms=service.ReadfileFromPhone(filename);

				    text2.setText(Sms);

				    Toast.makeText(getApplicationContext(), "读取手机中的短信成功", Toast.LENGTH_SHORT).show();

					Toast.makeText(getApplicationContext(),  "文件路径为"+getApplicationContext().getFilesDir().toString(), Toast.LENGTH_SHORT).show();

				}

				catch(Exception e)

				{

				Toast.makeText(getApplicationContext(), "读取手机中的短信失败", Toast.LENGTH_SHORT).show();

				}

				break;

			case R.id.button5:

				Tel=text1.getText().toString();

		        filename = Tel+".txt";

                Fileservice service4 = new Fileservice(getApplicationContext());

                try

                {

                	if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))

                	{

                		 text2.setText(service4.ReadfileToSD(filename));

                	   	Toast.makeText(getApplicationContext(), "读取SD卡中的短信成功", Toast.LENGTH_SHORT).show();

                	}

                	else

                	{

                		Toast.makeText(getApplicationContext(), "SD卡无法识别", Toast.LENGTH_SHORT).show();

                	}

                }

                catch(Exception e)

                {

                	Toast.makeText(getApplicationContext(), "读取SD卡中的短信失败", Toast.LENGTH_SHORT).show();

                }

                break;

			case R.id.button6:

				Tel=text1.getText().toString();

				Sms = text2.getText().toString();

                filename = Tel+".txt";

				Fileservice savecache = new Fileservice(getApplicationContext());

				try

				{

					savecache. SavefileToCache(filename, Sms);

				    Toast.makeText(getApplicationContext(), "保存到cache成功", Toast.LENGTH_SHORT).show();

					Toast.makeText(getApplicationContext(), "文件路径为"+getApplicationContext().getCacheDir().toString(), Toast.LENGTH_SHORT).show();

				}

				catch(Exception e)

				{

					Toast.makeText(getApplicationContext(), "保存到手机失败", Toast.LENGTH_SHORT).show();

				}

			case R.id.button7:

				Tel=text1.getText().toString();

			    filename = Tel+".txt";

			    try{

			    	 Fileservice service1=new Fileservice(getApplicationContext());

					 text2.setText(service1.ReadfileFromcache(filename));;

					 Toast.makeText(getApplicationContext(), "读取cache中的数据成功", Toast.LENGTH_SHORT).show();

			    }

			    catch(Exception e)

			    {

			    	Toast.makeText(getApplicationContext(), "读取cache中的数据失败", Toast.LENGTH_SHORT).show();

			    }

				break;

			case R.id.button8:

				Tel=text1.getText().toString();

				filename = Tel+".txt";

				getApplicationContext().deleteFile(filename);

				Toast.makeText(getApplicationContext(), "删除手机短信的短信成功", Toast.LENGTH_SHORT).show();

				break;

			case R.id.button9:

				Tel=text1.getText().toString();

		        filename = Tel+".txt";

                try

                {

                	if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))

                	{

                		File file=new File(Environment.getExternalStorageDirectory(),filename);

                		file.delete();

                	   	Toast.makeText(getApplicationContext(), "删除SD卡中的短信成功", Toast.LENGTH_SHORT).show();

                	}

                	else

                	{

                		Toast.makeText(getApplicationContext(), "SD卡无法识别", Toast.LENGTH_SHORT).show();

                	}

                }

                catch(Exception e)

                {

                	Toast.makeText(getApplicationContext(), "删除SD卡中的短信失败", Toast.LENGTH_SHORT).show();

                }

                break;

			case R.id.button10:

				Log.i(Tag,"Clear the cache\n");

				File cachedir = getApplicationContext().getCacheDir();

				Log.i(Tag,"Get the patch\n");

			    File file=new File(cachedir,filename);

			    Log.i(Tag,"Get the file structor\n");

			    file.delete();

			    Log.i(Tag,"Clear the cache end\n");

				Toast.makeText(getApplicationContext(), "删除Cache中数据成功", Toast.LENGTH_SHORT).show();

				break;

			}

			}

		};

}

在本实践中还要学会调试方式：

1.採用logcat查看日志调试

2.通过File explorer 导出文件调试

3.单元測试调试

4. 怎样通过google 官方手冊学习API的使用

重要类;context,上下文，一般一个类实例化后就有一个上下文。

測试结果：

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