Android編程之基于Log演示一個activity生命周期實例詳解

2020-04-11 11:09:36

字體：大中小

供稿：網(wǎng)友

本文實例講述了Android編程之基于Log演示一個activity生命周期。分享給大家供大家參考，具體如下：

利用Android的Log 演示一個activity的生命周期

代碼：

//DemoActivity.javapackage uni.activity;/*@author octobershiner2011 7 22SE.HIT*/import android.app.Activity;import android.os.Bundle;import android.util.Log;public class ActivityDemoActivity extends Activity {  /** Called when the activity is first created. */  private static final String TAG = "demo";  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   Log.d("demo", "this is a test string ");  }  protected void onStart(){   super.onStart();   Log.i(TAG, "The activity state---->onStart");  }  protected void onRestart(){   super.onRestart();   Log.i(TAG, "The activity state---->onReatart");  }  protected void onResume(){   super.onResume();   Log.i(TAG, "The activity state---->onResume");  }  protected void onPause(){   super.onPause();   Log.i(TAG, "The activity state---->onPause");  }  protected void onStop(){   super.onStop();   Log.i(TAG, "The activity state---->onStop");  }  protected void onDestroy(){   super.onDestroy();   Log.i(TAG, "The activity state---->onDestroy");  }}

這是演示的結(jié)果

利用LOG展示activity的生命周期

注釋表示中間執(zhí)行的操作為方便的觀察數(shù)據(jù)，可以在LOGCAT窗口（沒有的話可以在window菜單中的show view中調(diào)出）的右側(cè)單擊加號創(chuàng)建一個過濾器，我的例子中過濾的是demo

//開始運行demo 07-22 11:18:19.311: INFO/demo(281): The activity state---->onStart07-22 11:18:19.311: INFO/demo(281): The activity state---->onResume//按下了back鍵 返回 activity從stack中彈出07-22 11:18:34.821: INFO/demo(281): The activity state---->onPause07-22 11:18:35.090: INFO/demo(281): The activity state---->onStop07-22 11:18:35.090: INFO/demo(281): The activity state---->onDestroy//再次啟動demo07-22 11:18:45.550: INFO/demo(281): The activity state---->onStart07-22 11:18:45.550: INFO/demo(281): The activity state---->onResume//按下了HOME鍵 當前TASK 處于后臺轉(zhuǎn)態(tài)，系統(tǒng)保存狀態(tài)07-22 11:18:53.750: INFO/demo(281): The activity state---->onPause07-22 11:18:54.820: INFO/demo(281): The activity state---->onStop//再次啟動demo 回復(fù)原來的TASK activity在棧頂07-22 11:19:03.550: INFO/demo(281): The activity state---->onReatart07-22 11:19:03.550: INFO/demo(281): The activity state---->onStart07-22 11:19:03.550: INFO/demo(281): The activity state---->onResume

另外過濾查看log的方法：

實例

復(fù)制代碼代碼如下:

Log.i("yourDemo","this is my log");

沒有LOGCAT窗口的朋友可以在window菜單中的show view中調(diào)出窗口