android 程序间跳转

demo：

package com.android.tutor;
 
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class StartAnotherApplicationDemo extends Activity {
    private Button mButton01, mButton02;
 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        mButton01 = (Button) findViewById(R.id.button);
        mButton02 = (Button) findViewById(R.id.start_calender);
 
        // -----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);
            }
        });
    }
}