java– 为什么在循环中读取logcat只读一次

概述我在2.3.3到4.1的任何仿真器和实际设备上运行我的服务(写logcat到文件).一切都好.在此设备上生成正确的日志：---------beginningof/dev/log/main---------beginningof/dev/log/systemI/ActivityManager(3386):START{act=android.intent.action.MAINcat=[android.inte

我在2.3.3到4.1的任何仿真器和实际设备上运行我的服务(写logcat到文件).一切都好.
在此设备上生成正确的日志：

--------- beginning of /dev/log/main--------- beginning of /dev/log/systemI/ActivityManager( 3386): START {act=androID.intent.action.MAIN cat=[androID.intent.category.HOME] flg=0x10000000 cmp=com.androID.launcher/com.androWAcivtMaae( 36:Ivldakgnme W/ActivityManager( 3386): Duplcaefns eus orcitRod45c6 o.vnotsolet.tiiyilgI/ActivityManager( 3386): displayed com.androID.calculator2/.Calculator: +9s374ms<br>..........

但是当我在4.1.2(三星(谷歌)Nexus S(soju,crespo),SDK 16,flash 485486,构建JZO54K)或2.3.6上运行服务时,我的服务停在日志中的一行之后.

在此设备上生成错误的日志：

--------- beginning of /dev/log/main

只打印一行,什么都没有….服务留在内存中,但不能正常工作……

这是我的代码

AndroIDManifest

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"          package="com.my.logcatt"          androID:versionCode="1"          androID:versionname="0.5">    <uses-sdk androID:minSdkVersion="10" />    <uses-permission androID:name="androID.permission.READ_EXTERNAL_STORAGE" />    <uses-permission androID:name="androID.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission androID:name="androID.permission.RECEIVE_BOOT_COMPLETED" />    <uses-permission androID:name="androID.permission.READ_LOGS" />    <application androID:theme="@androID:style/theme.NoTitlebar">     <activity androID:name=".ActivityMain" androID:label="logcatt">      <intent-filter>       <action   androID:name="androID.intent.action.MAIN" />       <category androID:name="androID.intent.category.LAUNCHER" />       </intent-filter>     </activity>     <receiver androID:name=".broadcastBoot" androID:enabled="true" androID:exported="false">      <intent-filter>       <action androID:name="androID.intent.action.BOOT_COMPLETED" />      </intent-filter>     </receiver>     <service androID:name=".ServiceMain" androID:enabled="true" />    </application></manifest>

活动

package com.my.logcatt;import androID.app.Activity;import androID.content.Intent;import androID.os.Bundle;public class ActivityMain extends Activity {   @OverrIDe   public voID onCreate( Bundle savedInstanceState)     {      super.onCreate( savedInstanceState);      setContentVIEw( R.layout.main);      try { startService( new Intent( getApplicationContext(), ServiceMain.class)); }  catch( Exception e) {}    }  }

服务

package com.my.logcatt;import java.io.BufferedReader;import java.io.BuffereDWriter;import java.io.fileWriter;import java.io.inputStreamReader;import androID.app.Service;import androID.content.Intent;import androID.os.Environment;import androID.os.IBinder;public class ServiceMain extends Service {   public  static Process             procLogcatClean = null;   public  static Process             procLogcatAM    = null;   public  static BufferedReader      readerLogcat    = null;   public static voID fLog( String sLogMessage)    {      fileWriter     fileLog   = null;      BuffereDWriter bufferLog = null;      try        {          fileLog = new fileWriter( Environment.getExternalStorageDirectory().getabsolutePath() + "/123.log", true);          if( fileLog != null)            {              bufferLog = new BuffereDWriter( fileLog);              bufferLog.write( sLogMessage + "\r\n");              bufferLog.flush();            }        }       catch( Exception e) {}       finally         {          if( bufferLog != null) { try { bufferLog.close(); } catch( Exception e) {} }          if( fileLog   != null) { try { fileLog.close();   } catch( Exception e)   {} }        }    }   @OverrIDe   public voID onCreate()    {      super.onCreate();      startService();    }   @OverrIDe   public IBinder onBind(Intent intent)     {      return null;    }   @OverrIDe   public voID onDestroy()    {      super.onDestroy();    }   public voID startService()    {      final Thread thread = new Thread()       {         public voID run()          {            try              {                Runtime localRuntimeClear = Runtime.getRuntime();                String[] sLogcatClear = new String[ 2];                sLogcatClear[ 0] = "logcat";                sLogcatClear[ 1] = "-c";                procLogcatClean = localRuntimeClear.exec( sLogcatClear);                procLogcatClean.waitFor();                Runtime localRuntimeAM = Runtime.getRuntime();                String[] sLogcatAM = new String[ 2];                sLogcatAM[ 0] = "logcat";                sLogcatAM[ 1] = "ActivityManager:I *:S";                procLogcatAM = localRuntimeAM.exec( sLogcatAM);                readerLogcat = new BufferedReader( new inputStreamReader( procLogcatAM.getinputStream()), 1024);                String str = "";                while( true)                 {                   str = "";                   try                     {                       if( readerLogcat != null)                         {                           str = readerLogcat.readline();                           fLog( str);                         }                     }                    catch( Exception e) {}                   if( str.compareto( "") == 0)  continue;                 }              }             catch( Exception e) {}             finally {}           }       };      thread.setPriority( Thread.MAX_PRIORITY);      thread.start();   } }

怎么了？

解决方法:

在4.1.2.,只有root和系统应用程序才能访问logcat.如果是root,你可以使用“su logcat”.

https://groups.google.com/forum/?fromgroups=#!topic/android-developers/6U4A5irWang

我怀疑你会发现这一行引发了一个你不能处理的异常(糟糕的做法顺便说一下 – 如果你有一个合适的捕获,你会发现我认为这个).

procLogcatAM = localRuntimeAM.exec( sLogcatAM);

否则,请检查AndroID版本并执行其他 *** 作或检查是否允许拒绝.或者,将您的应用限制为< 4.1.

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