android启动另一应用

http://www.2cto.com/kf/201203/122910.html

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);
    }
}
//-----启动我们自身写的程序------------------
        mButton01.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v) {
                //-----核心部分----- 前名一个参数是应用程序的包名,后一个是这个应用程序的主Activity名
                Intent intent=new Intent();
                intent.setComponent(new ComponentName("com.droidnova.android.games.vortex",
                                                     "com.droidnova.android.games.vortex..Vortex"));
                startActivity(intent);
            }
        });
      //-----启动系统自带的应用程序------------------
        mButton02.setOnClickListener(new Button.OnClickListener(){
            public void onClick(View v) {
                Intent intent=new Intent();
                intent.setComponent(new ComponentName("com.android.calendar", "com.android.calendar.LaunchActivity"));
                startActivity(intent);
            }
        });