Go语言视频零基础入门到精通

2878qw

  即列出所有Launcher程序通过PackageManager来获取

       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

java代码： 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

java代码： 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

java代码： 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

java代码： 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);

}

});