android系统中，运行指定的应用程序

在android开发中，如何才能运行选定的应用程序。

例如有一个像settings中的应用程序列表，点击一个应用程序后，android将运行该程序？

本人正好在项目中实现了该功能，现与大家分享，代码如下：

private void runActivity() {

String packageName = applicationInfo.packageName;

Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);

resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);

resolveIntent.setPackage(packageName);

List<ResolveInfo> apps = getPackageManager().queryIntentActivities(resolveIntent, PackageManager.GET_ACTIVITIES);

if(apps.size() == 0) {

Toast.makeText(this, "无法启动该应用", Toast.LENGTH_SHORT).show();

return;

}

ResolveInfo ri = apps.get(0);

if (ri != null) {

String className = ri.activityInfo.name;

ComponentName cn = new ComponentName(packageName, className);

Intent intent = new Intent();

intent.setComponent(cn);

startActivity(intent);

}

}

applicationInfo很重要，可将ApplicationInfo对象设置为全局变量，点击一个item后对其进行赋值，如下：

private ApplicationInfo applicationInfo ;

public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {

applicationInfo = packageInfos.get(position).applicationInfo;

boolean flag = false;

if((applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) {

// Updated system app

flag = true;

} else if((applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {

// Non-system app

flag = true;

}

if(flag) {

Log.e("sky", "is not system app");

}

}