Android实现手机壁纸改变的方法

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical" android:layout_width="fill_parent"  android:layout_height="fill_parent">  <Button android:id="@+id/clearWall"    android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:text="恢复默认墙纸" />  <ImageView android:id="@+id/currWall"     android:layout_width="100px"    android:layout_height="150px"    android:layout_gravity="center_horizontal" />  <Button android:id="@+id/getWall"     android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:text="获取当前墙纸" />  <Gallery android:id="@+id/gallery"    android:layout_width="fill_parent"    android:layout_height="wrap_content" />  <Button android:id="@+id/setWall"     android:layout_width="fill_parent"    android:layout_height="wrap_content"     android:text="设置为当前墙纸" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.ljq.activity"   android:versionCode="1"   android:versionName="1.0">  <application android:icon="@drawable/icon" android:label="@string/app_name">    <activity android:name=".WallActivity"         android:label="@string/app_name">      <intent-filter>        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.LAUNCHER" />      </intent-filter>    </activity>  </application>  <uses-sdk android:minSdkVersion="7" />  <!-- 设置手机墙纸权限 -->  <uses-permission android:name="android.permission.SET_WALLPAPER" /></manifest>

package com.ljq.activity;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class WallAdapter extends BaseAdapter {  private int[] imgIds = null;  private Context context = null;  public WallAdapter(int[] imgIds, Context context) {    super();    this.imgIds = imgIds;    this.context = context;  }  public int getCount() {    return imgIds.length;  }  public Object getItem(int position) {    //return imgIds[position];    return imgIds[position%imgIds.length];//可循环  }  public long getItemId(int position) {    return position;  }  public View getView(int position, View convertView, ViewGroup parent) {    ImageView imageView = new ImageView(context);    imageView.setBackgroundResource(imgIds[position]);// 设置ImageView的背景图片    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);    imageView.setLayoutParams(new Gallery.LayoutParams(120, 120));    return imageView;  }}

package com.ljq.activity;import java.io.IOException;import java.io.InputStream;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.Button;import android.widget.Gallery;import android.widget.ImageView;import android.widget.AdapterView.OnItemSelectedListener;public class WallActivity extends Activity {  private int[] imgIds={R.drawable.w1, R.drawable.w2, R.drawable.w3, R.drawable.w4};  private int selectIndex=-1;//被选中的图片在id数组中的索引  private ImageView currWall=null;  private Gallery gallery=null;  private Button clearWall=null;  private Button getWall=null;  private Button setWall=null;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    gallery=(Gallery)findViewById(R.id.gallery);    gallery.setAdapter(new WallAdapter(imgIds, WallActivity.this));    gallery.setSpacing(5);    gallery.setOnItemSelectedListener(new OnItemSelectedListener(){      public void onItemSelected(AdapterView<?> parent, View view,          int position, long id) {        selectIndex = position;//记录被选中的图片索引      }      public void onNothingSelected(AdapterView<?> parent) {      }    });    currWall=(ImageView)findViewById(R.id.currWall);    clearWall=(Button)findViewById(R.id.clearWall);    getWall=(Button)findViewById(R.id.getWall);    setWall=(Button)findViewById(R.id.setWall);    clearWall.setOnClickListener(listener);    getWall.setOnClickListener(listener);    setWall.setOnClickListener(listener);  }  View.OnClickListener listener=new View.OnClickListener(){    public void onClick(View v) {      Button btn=(Button)v;      switch (btn.getId()) {      case R.id.clearWall://还原手机壁纸        try {          WallActivity.this.clearWallpaper();        } catch (IOException e) {          e.printStackTrace();        }        break;      case R.id.getWall://设置ImageView显示的内容为当前墙纸        currWall.setBackgroundDrawable(getWallpaper());        break;      case R.id.setWall://设置墙纸        InputStream in=WallActivity.this.getResources().openRawResource(imgIds[selectIndex]);        try {          setWallpaper(in);        } catch (IOException e) {          e.printStackTrace();        }        break;      }    }  };}