UncaughtExceptionHandler定制自己的错误日志系统

Java为我们提供了一个机制，用来捕获并处理在一个线程对象中抛出的未检测异常，以避免程序终止。我们可以通过UncaughtExceptionHandler来实现这种机制。

 

具体实现：

public class CrashManager implements UncaughtExceptionHandler {
public static final String TAG = "CrashHandler";
// CrashHandler实例
private static CrashManager instance;
// 程序的Context对象
private Application application;
// 系统默认的UncaughtException处理类
private UncaughtExceptionHandler mDefaultHandler;

/**
* 保证只有一个CrashHandler实例
*/
private CrashManager(Context context) {
application = (Application) context.getApplicationContext();
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
}

/**
* 获取CrashHandler实例 ,单例模式
*/
public static CrashManager getInstance(Context context) {
CrashManager inst = instance;
if (inst == null) {
synchronized (CrashManager.class) {
inst = instance;
if (inst == null) {
inst = new CrashManager(context.getApplicationContext());
instance = inst;
}
}
}
return inst;
}

/**
* 当UncaughtException发生时会转入该函数来处理
*/
@Override
public void uncaughtException(Thread thread, Throwable ex) {
TaskManager.getInstance(application).saveErrorLog(ex);
mDefaultHandler.uncaughtException(thread, ex);
}

}

日志写入sdcard代码：

public class SaveErrorTask<T> extends Task<Object, Object, Void> {
private SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.CHINA);
private Context context;
private Throwable ex;

public SaveErrorTask(Context context, Throwable ex) {
setPriority(TaskPriority.UI_LOW);
this.context = context;
this.ex = ex;
}

@Override
protected Void doInBackground(Object... arg0) {
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
String time = formatter.format(new Date());
String fileName = time + ".txt";
StringBuilder stringBuffer = new StringBuilder();
DeviceInfo deviceInfo = Utils.getDeviceInfo(context);
stringBuffer.append("\nsdkVersion：" + deviceInfo.sdkVersion);
stringBuffer.append("\nmanufacturer：" + deviceInfo.manufacturer);
stringBuffer.append("\nmodel：" + deviceInfo.model);
stringBuffer.append("\nversion" + ConfigManager.getVersionName(context));
stringBuffer.append("\nerrorStr：" + result);
stringBuffer.append("\ntime：" + time);
String filePath = CacheFileUtils.getLogPath(fileName);
CacheFileUtils.saveErrorStr(filePath, stringBuffer.toString());
return null;
}
}

初始化：

public class MyApplication extends MultiDexApplication {

@Override
public void onCreate() {
super.onCreate();
//初始化 错误日子系统
CrashManager.getInstance(this);

}
}