android call intent the other package. example source code.

package lowmans.test.MyTest;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MyTest extends Activity {

private Intent intent;

private final String packageName = "com.android.music";   

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        intent = this.getPackageManager().getLaunchIntentForPackage(packageName);

        Button btn  = (Button)findViewById(R.id.Button01);

        btn.setOnClickListener(new OnClickListener(){

         public void onClick(View v){

         MyTest.this.startActivity(intent);

         }

        });

    }

}