android修改默认桌面

package com.lxl.lock;

import java.util.List;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;

public class MainActivity extends Activity {  
    private GridView mGridView;  
    private List<ResolveInfo> mApps;  
 
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);  
        
        loadApps();  
        mGridView = (GridView) findViewById(R.id.gridView1);  
        mGridView.setAdapter(new AppAdapter(this, mApps));  
          
          
        mGridView.setOnItemClickListener(new OnItemClickListener() {  
 
            @Override  
            public void onItemClick(AdapterView<?> parent, View view,  
                    int position, long id) {  
                ResolveInfo info = mApps.get(position);  
                // 应用的包名  
                String pkg = info.activityInfo.packageName;  
                // 应用的主Activity  
                String cls = info.activityInfo.name;  
                ComponentName componentName = new ComponentName(pkg, cls);  
                Intent intent = new Intent();  
                intent.setComponent(componentName);  
                startActivity(intent);  
            }  
        });  
    }  
 
    /**
     * 加载app
     */  
    private void loadApps() {  
        Intent intent = new Intent(Intent.ACTION_MAIN, null);  
        intent.addCategory(Intent.CATEGORY_LAUNCHER);  
        mApps = getPackageManager().queryIntentActivities(intent, 0);  
    }  
 
} 

//适配器
package com.lxl.lock;

import java.util.List;

import android.content.Context;
import android.content.pm.ResolveInfo;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class AppAdapter extends BaseAdapter {
List<ResolveInfo> mApps;
Context context;

public AppAdapter(Context context, List<ResolveInfo> apps) {
super();
this.context = context;
this.mApps = apps;
}

@Override
public int getCount() {
return mApps.size();
}

@Override
public Object getItem(int position) {
return mApps.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView iv;
if (convertView == null) {
iv = new ImageView(context);
iv.setScaleType(ScaleType.FIT_CENTER);
iv.setLayoutParams(new GridView.LayoutParams(50,50));
} else {
iv = (ImageView) convertView;
}
ResolveInfo info = mApps.get(position);
iv.setImageDrawable(info.activityInfo.loadIcon(context.getPackageManager()));
return iv;
}

}

mainfest文件。。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.lxl.lock"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />

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

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.lxl.lock.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

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

<!-- 增加以下两行 -->
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>

</manifest>

设置流程：
找到设置-》显示-》默认桌面-》选择自定义的那个

然后点击home，发现弹出的应该就是自定义的那个界面了。