android 获取lanucher 列表

引用：http://www.iteye.com/topic/696187

获取Launcher 启动列表

即 列出所有Launcher程序 通过PackageManager 来获取

[代码 步骤]

1. 定义内部类 LauncherItem  用于定义Application相关属性 比如：图标 名称 以及 ComponentName

public class LauncherItem {
        Drawable icon;
        String name;
        ComponentName component;

        LauncherItem(Drawable d, String s,ComponentName cn){
            icon = d;
            name = s;
            component = cn;
        }
    };

2.  定义List<LauncherItem> lvalue 用于存放查询结果

public void addLauncher(){
        lvalue = new ArrayList<LauncherItem>();

        pkgMgt = this.getPackageManager();

        //to query all launcher & load into List<>
        Intent it = new Intent(Intent.ACTION_MAIN);
        it.addCategory(Intent.CATEGORY_LAUNCHER);

        List<ResolveInfo> ra =pkgMgt.queryIntentActivities(it,0);

        for(int i=0;i<ra.size();i++){
            ActivityInfo ai = ra.get(i).activityInfo;

            //String ainfo = ai.toString();
            Drawable icon = ai.loadIcon(pkgMgt);
            String label = ai.loadLabel(pkgMgt).toString();
            ComponentName c = new ComponentName(ai.applicationInfo.packageName,ai.name);


            LauncherItem item = new LauncherItem(icon,label,c);

            lvalue.add(item);
        }

    }

3. 定义LauncherAdapter 并指定各个item显示样式

public class LauncherAdapter extends BaseAdapter {
        Activity activity;

        public LauncherAdapter(Activity a){
            activity = a;
        }

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return lvalue.size();
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return arg0;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            return composeItem(position);
        }

        public View composeItem(int position){
            LinearLayout layout = new LinearLayout(activity);
            layout.setOrientation(LinearLayout.HORIZONTAL);

            ImageView iv = new ImageView(activity);
            iv.setImageDrawable(lvalue.get(position).icon);
            layout.addView(iv);

            TextView tv = new TextView(activity);
            tv.setText(lvalue.get(position).name);
            tv.setPadding(10, 5, 0, 0);
            layout.addView(tv);

            return layout;
        }



    }

4. 启动某个item 当单击时

adapter = new LauncherAdapter(this);
        lv.setAdapter(adapter);

        lv.setOnItemClickListener(new OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                Intent intent =new Intent(Intent.ACTION_VIEW);
                intent.setComponent(lvalue.get(arg2).component);
                startActivity(intent);
            }

        });

  

5.  emulator 结果结果

- 列出所有application

- 单击Alarm Clock 的情形：