发起一个特定程序以及直接发起一个地图而不加载地图

1.

// to get the list of apps you can launch 
Intent intent = new Intent(ACTION_MAIN); 
intent.addCategory(CATEGORY_LAUNCHER); 
List<ResolveInfo> infos = getPackageManager().queryIntentActivities(intent, 0); 
 
// resolveInfo.activityInfo.packageName = packageName 
// resolveInfo.activityInfo.name = className 
// reusing that intent 
intent.setClassName(packageName, className); 
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); 
startActivity(intent) 
2.Intent intent = new Intent(android.content.Intent.ACTION_VIEW,  
Uri.parse("http://maps.google.com/maps?saddr=20.344,34.34&daddr=20.5666,45.345"); 
startActivity(intent);