前言：
每当我们app测试的时候，测试人员总是对我们说这里崩溃了，那里挂掉了！我们只能默默接受，然后尝试着重现bug，更可悲的是有时候bug很难复现，为了解决这种现状所以我们要尝试这建立一个自己的bug日志系统。
实现原理：
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);
}
}
展望：我们也可以把日志再下次启动的时候发送至我们自己的日志服务器，监控用户错误信息