获取Launcher启动列表，即列出所有Launcher程序，通过PackageManager来获龋
[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
- 列出所有application
- 单击Alarm Clock的情形
