安卓中改变手机壁纸-蒲公英云

布局文件如下:
XML文件如下所示:
<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:background="#000000"
    android:orientation="vertical" >
    <Button
        android:id="@+id/btn_reset"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/returns" />
    <ImageView
        android:id="@+id/iv_current"
        android:layout_width="80dp"
        android:layout_height="130dp"
        android:layout_gravity="center_horizontal"
        android:contentDescription="@string/action_settings" />
    <Button
        android:id="@+id/btn_current"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/getcurrent" />
    <Gallery
        android:id="@+id/gallery"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:layout_gravity="center"
         />
    <Button
        android:id="@+id/btn_setwall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/setcurretn" />
</LinearLayout>

安卓手机壁纸的改变

<1>要实现这一功能需要添加一个权限

代码实现如下所示:
一、需要创建一个适配器
package com.brucecheng.waller;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
@SuppressWarnings("deprecation")
public class WallPaper extends BaseAdapter {
    //创建资源数组
    private int[] imageIds;
    private Context context;
    //重写构造方法
    public WallPaper(Context context,int[] imageIds){
        this.imageIds=imageIds;
        this.context=context;
    }
    @Override
    public int getCount() {
        return imageIds.length;
    }
    @Override
    public Object getItem(int position) {
        return imageIds[position];
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //创建一个ImageView用于显示壁纸图片
        ImageView iv=new ImageView(context);
        //设置参数
        iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
        iv.setLayoutParams(new Gallery.LayoutParams(120, 120));
        iv.setImageResource(imageIds[position]);
        return iv;
    }
二、Activity的代码实现如下所示:
package com.brucecheng.waller;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.ImageView;
@SuppressWarnings("deprecation")
public class WallerActivity extends Activity {
    //创建资源数组
    private int[] imageIds={R.drawable.bing11,
            R.drawable.bing12,
            R.drawable.bing5,
            R.drawable.bing6,
            R.drawable.bing7,
            R.drawable.album,
    };
    //创建一个整型值表示当前的壁纸
    int currentIndex=-1;
    //寻找控件
    Gallery gallery;
    Button btn_reset,btn_current,btn_setwall;
    ImageView iv_current;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //调用方法实例化控件
        findViewById();
        //为gallery绑定适配器
        gallery.setAdapter(new WallPaper(this, imageIds));
        //设置监听事件
        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                //记录被选中的图片索引
                currentIndex=position;
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
        //为其他的控件设置监听事件
        btn_current.setOnClickListener(listener);
        btn_setwall.setOnClickListener(listener);
        btn_reset.setOnClickListener(listener);
    }
    //重写监听事件
    OnClickListener listener=new OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
            //获取当前壁纸
            case R.id.btn_current:
                iv_current.setBackgroundDrawable(getWallpaper());
                break;
                //设置壁纸
            case R.id.btn_setwall:
                InputStream in=WallerActivity.this.getResources().openRawResource(imageIds[currentIndex]);
                //设为当前壁纸
                try {
                    setWallpaper(in);
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
                break;
                //恢复默认壁纸
            case R.id.btn_reset:
                try {
                    WallerActivity.this.clearWallpaper();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                break;
            }
        }
    };
    //自定义方法实例化控件
    public void findViewById(){
        btn_current=(Button) findViewById(R.id.btn_current);
        btn_reset=(Button) findViewById(R.id.btn_reset);
        btn_setwall=(Button) findViewById(R.id.btn_setwall);
        iv_current=(ImageView) findViewById(R.id.iv_current);
        gallery=(Gallery) findViewById(R.id.gallery);
    }
}