【移动应用开发技术】Android 之 LogDog

【移动应用开发技术】Android之LogDog

在写Android程序时，经常碰到在模拟器和调试器中无法捕捉的exception。有时自己运行好好的程序到了其他机器上就出现了问题。虽然GooglePlay有错误堆栈上传功能，但是没有办法把整个运行的过程记录下来。为此我写了一个LogDog类来试图解决这个问题。

importjava.io.BufferedWriter;

importjava.io.File;

importjava.io.FileWriter;

importjava.io.IOException;

importjava.io.PrintWriter;

importjava.lang.Thread.UncaughtExceptionHandler;

importjava.sql.Date;

importjava.text.SimpleDateFormat;

importjava.util.HashSet;

importandroid.content.Context;

importandroid.content.pm.PackageInfo;

importandroid.content.pm.PackageManager;

importandroid.content.pm.PackageManager.NameNotFoundException;

importandroid.os.Build;

importandroid.os.Environment;

importandroid.os.Looper;

//importandroid.util.Log;

importandroid.util.Log;

publicclassLogDogimplementsUncaughtExceptionHandler{

publicstaticString TAG="LogDog";

privatestaticHashSet _tags=newHashSet();

privatestaticboolean _debug=false;

static{

//addtagstobecaptured

_tags.add(PDFMaster.TAG);

_tags.add(RecentlyUsedActivity.TAG);

_tags.add(DB.TAG);

}

publicstaticLogDoginstance(){

return_instance;

}

publicstaticvoidi(Stringtag,Stringmessage){

if(_debug){

Log.i(tag,message);

return;

}

PrintWriterwriter=_instance.getWriter();

if(writer!=null&&_tags.contains(tag)){

_instance._writer.println("i:"+tag+":"+message);

}

}

publicstaticvoide(Stringtag,Stringmessage){

if(_debug){

Log.i(tag,message);

return;

}

PrintWriterwriter=_instance.getWriter();

if(writer!=null&&_tags.contains(tag)){

_instance._writer.println("e"+tag+":"+message);

}

}

publicstaticvoidw(Stringtag,Stringmessage){

if(_debug){

Log.i(tag,message);

return;

}

PrintWriterwriter=_instance.getWriter();

if(writer!=null&&_tags.contains(tag)){

_instance._writer.println("w"+tag+":"+message);

}

}

publicvoidinit(Contextcontext){

_context=context;

_fileName=_context.getString(R.string.app_name)+".log";

_defaultHandler=Thread.getDefaultUncaughtExceptionHandler();

Thread.setDefaultUncaughtExceptionHandler(this);

}

publicvoidclose(){

if(_writer!=null){

_writer.close();

_writer=null;

}

}

//private

privatestaticLogDog _instance=newLogDog();

privatestaticfinalString PATH=

Environment.getExternalStorageDirectory().getPath()+"/log";

privateContext _context;

privateString _fileName;

privateThread.UncaughtExceptionHandler _defaultHandler;

privatePrintWriter _writer=null;

privateLogDog(){

}

privatePrintWritergetWriter(){

if(_writer!=null)

return_writer;

//checkifwehaveSDcard

if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){

//Log.w(TAG,"sdcardunmounted,skipdumpexception");

returnnull;

}

Filedir=newFile(PATH);

if(!dir.exists()){

dir.mkdirs();

}

Filefile=newFile(PATH+"/"+_fileName);

try{

_writer=newPrintWriter(newBufferedWriter(newFileWriter(file)));

}catch(IOExceptione){

//Log.e(TAG,"Failedtoopen"+PATH+"/"+FILE_NAME);

_writer=null;

}

return_writer;

}

@Override

publicvoiduncaughtException(Threadthread,Throwableex){

//firstdisplayatoastmessage

newThread(){

@Override

publicvoidrun(){

Looper.prepare();

PDFMarkerApp.instance().showToast("Sorryforthetrouble,dumpinguncaughtexeptiontoSDcard");

}

}.start();

try{

dump(ex);

}catch(Exceptione){

//Log.e(TAG,"Failedtodumpbecause"+e.getMessage());

e.printStackTrace();

}

if(_defaultHandler!=null){

_defaultHandler.uncaughtException(thread,ex);

}else{

//sleepsothetoastcanhavetimetodisplay

try{

Thread.sleep(3000);

}catch(InterruptedExceptione){

}

android.os.Process.killProcess(android.os.Process.myPid());

}

}

privatevoiddump(Throwableex)throwsIOException,NameNotFoundException{

PrintWriterwriter=_instance.getWriter();

if(writer==null)

return;

longcurrent=System.currentTimeMillis();

Stringtime=newSimpleDateFormat("yyyyMMdd.HHmmss").format(newDate(current));

_writer.println(time);

PackageManagerpm=_context.getPackageManager();

PackageInfopi=pm.getPackageInfo(_context.getPackageName(),PackageManager.GET_ACTIVITIES);

_writer.print("AppVersion:");

_writer.print(pi.versionName);

_writer.print('_');

_writer.println(pi.versionCode);

_writer.print("OSVersion:");

_writer.print(Build.VERSION.RELEASE);

_writer.print("_");

_writer.println(Build.VERSION.SDK_INT);

_writer.print("Vendor:");

_writer.println(Build.MANUFACTURER);

_writer.print("Model:");

_writer.println(Build.MODEL);

_writer.print("CPUABI:");

_writer.println(Build.CPU_ABI);

_writer.println();

ex.printStackTrace(_writer);

close();

Filefile=newFil