通过PackageManager的api 查询已经安装的apk

2011-06-14 20:23:00 955 收藏
分类专栏： Android 文章标签： api import null class object list
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通过PackageManager的api 查询已经安装的apk
我们写一个叫做loadApps的方法将活得的应用程序列表放到private List<ResolveInfo> mApps; 中，如下：

 

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private void loadApps() {
         Intent mainIntent = new Intent(Intent.ACTION_MAIN, null );
         mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
  
         mApps = getPackageManager().queryIntentActivities(mainIntent, 0 );
     }

‘

package org.bangchui.myhome;
  
  
import java.util.List;
  
  
import android.app.Activity;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
  
  
public class MyHome extends Activity {
       GridView mGrid;
      
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
          
         loadApps();
         setContentView(R.layout.main);
         mGrid = (GridView) findViewById(R.id.apps_list);
         mGrid.setAdapter( new AppsAdapter());
     }
      
      
     private List<ResolveInfo> mApps;
  
  
     private void loadApps() {
         Intent mainIntent = new Intent(Intent.ACTION_MAIN, null );
         mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
  
  
         mApps = getPackageManager().queryIntentActivities(mainIntent, 0 );
     }
  
  
     public class AppsAdapter extends BaseAdapter {
         public AppsAdapter() {
         }
  
  
         public View getView( int position, View convertView, ViewGroup parent) {
             ImageView i;
  
  
             if (convertView == null ) {
                 i = new ImageView(MyHome. this );
                 i.setScaleType(ImageView.ScaleType.FIT_CENTER);
                 i.setLayoutParams( new GridView.LayoutParams( 50 , 50 ));
             } else {
                 i = (ImageView) convertView;
             }
  
  
             ResolveInfo info = mApps.get(position);
             i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));
  
  
             return i;
         }
  
  
  
  
         public final int getCount() {
             return mApps.size();
         }
  
  
         public final Object getItem( int position) {
             return mApps.get(position);
         }
  
  
         public final long getItemId( int position) {
             return position;
         }
     }
}