学步园

activity生命周期图解：

测试类：

package com.zizhu.lifecycle;

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

public class Lifecycle_activityActivity extends Activity {
	
	public static final String TAG = "Lifecycle_activityActivity";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    	Log.i(TAG, "onCreate method invoked!");
    }
    
    public void openStopActitity(View view){
    	startActivity(new Intent(this, StopActivity.class));
    }
    
    public void openPauseActitity(View view){
    	startActivity(new Intent(this, PauseActivity.class));
    }

	@Override
	protected void onStart() {
		Log.i(TAG, "onStart method invoked!");
		super.onStart();//调用父类的方法不能删除，用于管理生命周期
	}

	@Override
	protected void onRestart() {
		Log.i(TAG, "onRestart method invoked!");
		super.onRestart();
	}

	@Override
	protected void onResume() {
		Log.i(TAG, "onResume method invoked!");
		super.onResume();
	}

	@Override
	protected void onPause() {
		Log.i(TAG, "onPause method invoked!");
		super.onPause();
	}

	@Override
	protected void onStop() {
		Log.i(TAG, "onStop method invoked!");
		super.onStop();
	}

	@Override
	protected void onDestroy() {
		Log.i(TAG, "onDestroy method invoked!");
		super.onDestroy();
	}
    
    
    
}

1.当打开activity的时候：调用 onCreate，onStart，onResume三个方法

2.当打开PauseActivity的时候，PauseActivity是对话形式的Activity,调用onPause方法

3.按下返回健，让其回到MainActivity，调用onResume方法

4.当打开StopActivity的时候，StopActivity会全部覆盖MainActivity,调用onPause，onStop两个方法

5.再次按下返回健，回到MainActivity，调用onRestart,onStart，onResume三个方法

6.按下返回健，回到主桌面，调用onPause，onStop，onDestroy三个方法，Activity生命周期结束