看代码学Android ：启动APK.

package com.test;

import java.net.URISyntaxException;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class TestActivity1 extends Activity  {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button btn = (Button)this.findViewById(R.id.button1);
        btn.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {
                //com.test.ApplicationManager
                try {
                    Intent intent = Intent.parseUri("intent:#Intent;action=android.intent.action.MAIN;component=com.test.ApplicationManager/.MainActivity;end", 0);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(intent);
                } catch (URISyntaxException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });
    }
}