Android实现手机壁纸改变的方法

本文实例讲述了Android实现手机壁纸改变的方法。分享给大家供大家参考。具体如下：

main.xml布局文件：

清单文件：

WallAdapter自定义适配器：

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;
  }
}

WallActivity类：

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;
      }
    }
  };
}

运行结果：

希望本文所述对大家的Android程序设计有所帮助。