学步园

Android SDK中有这样一个API：

public abstract Intent getLaunchIntentForPackage (String packageName)

如果packageName存在返回入口Intent， startActivity(Intent)可以启动应用，否则返回nullimport android.app.Activity;

下面有个小示例：

import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;

public class Main extends Activity {
        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
	PackageManager packageManager = getPackageManager(); 
       	Intent intent=new Intent(); 
       	intent =packageManager.getLaunchIntentForPackage("pkgName"); 
       	if(intent==null){
        	System.out.println("APP not found!");
       }
       	startActivity(intent);       
	}
}