通过PackageManager的api 查询已经安装的apk

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;

        }

    }

}