android singleTop学习

在Flag标志位设置t.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

与在androidManifest.xml中设置android:lauchmode="singleTop"

效果一样，

如下：

package com.singletop.test1;

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

public class SingleTopTest1Activity extends Activity {
    /** Called when the activity is first created. */
    private Button btn1;
    private String TAG="SingleTopTest1Activity";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn1 = (Button) findViewById(R.id.btn1);
        btn1.setOnClickListener(mylistener);
        Log.d(TAG,"11111oncreateid=="+this.getTaskId());
    }
    OnClickListener mylistener = new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent t = new Intent();
            t.setClass(SingleTopTest1Activity.this, SingleTopTest1Activity.class);
            t.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
            startActivity(t);
        }

    };
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.d(TAG,"11111oncreateid=="+this.getTaskId());
    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        Log.d(TAG,"11111onPause=="+this.getTaskId());
    }
    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        Log.d(TAG,"11111onResume=="+this.getTaskId());
    }
    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        Log.d(TAG,"11111onStop=="+this.getTaskId());
    }
    @Override
    protected void onNewIntent(Intent intent) {
        // TODO Auto-generated method stub
        super.onNewIntent(intent);
        Log.d(TAG,"11111onNewIntent=="+this.getTaskId());
    }
    
    
}

 

Log信息如下：

02-20 05:39:07.347: D/SingleTopTest1Activity(1249): 11111oncreateid==4
02-20 05:39:07.349: D/SingleTopTest1Activity(1249): 11111onResume==4
02-20 05:39:13.565: D/SingleTopTest1Activity(1249): 11111onPause==4
02-20 05:39:13.566: D/SingleTopTest1Activity(1249): 11111onNewIntent==4
02-20 05:39:13.566: D/SingleTopTest1Activity(1249): 11111onResume==4
02-20 05:39:23.197: D/SingleTopTest1Activity(1249): 11111onPause==4
02-20 05:39:23.810: D/SingleTopTest1Activity(1249): 11111onStop==4
02-20 05:39:23.813: D/SingleTopTest1Activity(1249): 11111oncreateid==4

不会new instance，而是调用onNewIntent。

还是这一个实例。