Android 使用UncaughtExceptionHandler定制自己的错误日志系统

2.什么是uncaught exception

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uncaught exception即没有捕获的异常 很多异常是没有去捕获的,比如NullPointerException,这种错误一旦出现则app必崩溃,一般可能是自己的代码写得有点问题.

3.写一个类实现UncaughtExceptionHandler

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/**

• UncaughtException处理类,当程序发生Uncaught异常的时候,由该类来接管程序,并记录发送错误报告. 需要在Application中注册，为了要在程序启动器就监控整个程序。

*/

public class CrashHandler implements UncaughtExceptionHandler {

private static CrashHandler mInstance;

private Map<String, String> mErrorMap = new HashMap<>();

private DateFormat mFormatter = new SimpleDateFormat(“yyyy-MM-dd-HH-mm-ss”);

private CrashHandler() {

}

public static CrashHandler getInstance() {

if (mInstance == null){

mInstance = new CrashHandler();

}

return mInstance;

}

/**

• 初始化

*/

public void init() {

Thread.setDefaultUncaughtExceptionHandler(this);

}

/**

• 当UncaughtException发生时会转入该函数来处理

*/

@Override

public void uncaughtException(Thread thread, Throwable ex) {

try {

handleException(ex);

Thread.sleep(1000);

//退出所有Activity

AppManager.getAppManager().finishAllActivity();

//友盟,用来提交错误日志

MobclickAgent.reportError(BaseApplication.getInstance(), “崩溃：” + ex.getCause());

android.os.Process.killProcess(android.os.Process.myPid()); // 获取PID

System.exit(0); // 常规java、c#的标准退出法，返回值为0代表正常退出

} catch (InterruptedException e) {

}

}

/**

• 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.

• @param ex

• @return true:如果处理了该异常信息;否则返回false.

*/

private boolean handleException(final Throwable ex) {

if (ex == null) {

return false;

}

new Thread() {

@Override

public void run() {

//子线程 自己管理Looper

Looper.prepare();

ToastUtils.showMessage(BaseApplication.getInstance(), “很抱歉，程序出现异常，即将退出”);

ex.printStackTrace();

Looper.loop();

}

}.start();

collectDeviceInfo();

saveCatchInfo2File(ex);

return true;

}

/**

• 收集设备参数信息

*/

private void collectDeviceInfo() {

mErrorMap.put(“versionName”, PackageUtils.getVersionName(BaseApplication.getInstance()));

mErrorMap.put(“versionCode”, PackageUtils.getVersionCode(BaseApplication.getInstance()) + “”);

//通过反射获取所有的字段信息 比如时间,设备系统版本,设备型号等等

Field[] fields = Build.class.getDeclaredFields();

for (Field field : fields) {

try {

field.setAccessible(true);

mErrorMap.put(field.getName(), field.get(null).toString());

} catch (Exception e) {

}

}

}

private String getFilePath() {

String file_dir;

boolean isSDCardExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());

boolean isRootDirExist = Environment.getExternalStorageDirectory().exists();

if (isSDCardExist && isRootDirExist) {

file_dir = Environment.getExternalStorageDirectory().getAbsolutePath() + “/crashlog/”;

} else {

file_dir = MyApplication.getInstance().getFilesDir().getAbsolutePath() + “/crashlog/”;

}

return file_dir;

}

/**

• 保存错误信息到文件中

• @param ex

• @return 返回文件名称, 便于将文件传送到服务器

*/

private String saveCatchInfo2File(Throwable ex) {

StringBuffer sb = new StringBuffer();

for (Map.Entry<String, String> entry : mErrorMap.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

sb.append(key + “=” + value + “\n”);

}

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();

sb.append(result);

try {

String time = mFormatter.format(new Date());

String fileName = “crash-” + time + “.log”;

String file_dir = getFilePath();

File dir = new File(file_dir);