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：
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//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）的右側單擊加號創(chuàng)建一個過濾器，我的例子中過濾的是demo
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//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
復制代碼 代碼如下:
log.i("yourdemo","this is my log");
沒有l(wèi)ogcat窗口的朋友可以在window菜單中的show view中調(diào)出窗口
五個圓圈分別可以過濾五種不同的log
注意右邊的綠色加號，單擊可以自定義自己的過濾器，名字隨便起就好了
by log tag欄目中 選擇你要創(chuàng)建的過濾規(guī)則，比如你要過濾出所遇tag標記為“yourdemo”的log，就可以在里面輸入yourdemo了
希望本文所述對大家android程序設計有所幫助。
