解決如何監(jiān)聽Activity切換
來源：程序員人生 發(fā)布時間：2014-09-18 03:29:56 閱讀次數(shù)：5197次
本篇博文在我之前的博文中已經(jīng)提到了，但是監(jiān)聽Activity切換又可以作為一個單獨的內(nèi)容來敘述，因此這里又單獨拿了出來進(jìn)行贅述。
Activity的切換無非有兩種，第一種：啟動或者創(chuàng)建一個新的Activity；第二種：喚醒后臺運行的Activity。因此如果我們能夠成功監(jiān)聽到啟動或者創(chuàng)建一個Activity，或者喚醒Activity我們就基本完成了Activity的切換的監(jiān)聽。
在源碼/frameworks/base/core/java/android/app目錄下ActivityThread.java中為我們提供了這樣一個方法來幫助我們完成對Activity啟動、創(chuàng)建、銷毀、暫停、停止，喚醒等生命周期的監(jiān)聽。
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public void handleMessage(Message msg) {
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if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
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switch (msg.what) {
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case LAUNCH_ACTIVITY: {
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if ( true == mEnableAppLaunchLog && !mIsUserBuild && false == mTraceEnabled ) {
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try {
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FileInputStream fprofsts_in = new FileInputStream("/proc/mtprof/status");
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if ( fprofsts_in.read()== '3' ) {
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Log.v(TAG, "start Profiling for empty process");
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mTraceEnabled = true;
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Debug.startMethodTracing("/data/data/applaunch");
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}
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} catch (FileNotFoundException e) {
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Slog.e(TAG, "mtprof entry can not be found", e);
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} catch (java.io.IOException e) {
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Slog.e(TAG, "mtprof entry open failed", e);
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}
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}
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Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER | Trace.TRACE_TAG_PERF, "activityStart");
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ActivityClientRecord r = (ActivityClientRecord)msg.obj;
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r.packageInfo = getPackageInfoNoCheck(
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r.activityInfo.applicationInfo, r.compatInfo);
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handleLaunchActivity(r, null);
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Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER | Trace.TRACE_TAG_PERF);
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} break;
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case RELAUNCH_ACTIVITY: {
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Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityRestart");
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ActivityClientRecord r = (ActivityClientRecord)msg.obj;
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handleRelaunchActivity(r);
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Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
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} break;
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case PAUSE_ACTIVITY:
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Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityPause");
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handlePauseActivity((IBinder)msg.obj, false, msg.arg1 != 0, msg.arg2);
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maybeSnapshot();
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Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
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break;
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case PAUSE_ACTIVITY_FINISHING:
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