android 保存 app crash日志（UncaughtExceptionHandler）

前言：android 开发中常常会遇到程序奔溃的问题，如果不是在开发环境下，很难找到问题，这时候就需要查看日志文件，来定位问题。我所使用的方法可能不完美，但是简单，具体使用如下：

1.首先需要自定义一个application，然后继承自MultiDexApplication（使用这个的原因是有些lib里边可能出现65535限制），然后继承Thread.UncaughtExceptionHandler：

/**
 1. @author xyd
 */
public class IsIpManagerApplication extends MultiDexApplication implements Thread.UncaughtExceptionHandler {
}
           

2.然后重写uncaughtException方法：

@Override
    public void uncaughtException(Thread thread, Throwable throwable) {
        ThreadPoolManager threadPoolManager = ThreadPoolManager.getmInstance();
        threadPoolManager.execute(new Runnable() {
            @Override
            public void run() {
                saveErrorLog2Sdcard(throwable);
                android.os.Process.killProcess(android.os.Process.myPid());
            }
        });
    }
     private void saveErrorLog2Sdcard(Throwable ex) {
        try {
            Calendar cal = Calendar.getInstance(TimeZone
                    .getTimeZone("GMT+08:00"));
            int year = cal.get(Calendar.YEAR);
            int month = cal.get(Calendar.MONTH) + ;
            int day = cal.get(Calendar.DAY_OF_MONTH);
            int hour = cal.get(Calendar.HOUR_OF_DAY);
            int minute = cal.get(Calendar.MINUTE);
            int second = cal.get(Calendar.SECOND);
            File dir = new File(Constant.FOLDER_EXCEPTION);
            if (!dir.exists()) {
                dir.mkdirs();
            }
            File file = new File(dir, "自定义名字.log");
            if (!file.exists()) {
                file.createNewFile();
            }
            FileOutputStream fos = new FileOutputStream(file, true);
            String exceptionHeader ="*************************自定义名字************";
            exceptionHeader=exceptionHeader+"********************at " + year + "/"
                    + month + "/" + day + "  " + hour + ":" + minute + ":"
                    + second + "  ***************\r\n</br>";
            fos.write(exceptionHeader.getBytes());
            ex.printStackTrace(new PrintStream(fos));
            fos.flush();
            fos.close();
            Log.e("自定义名字", "********************at " + year + "/" + month
                    + "/" + day + "  " + hour + ":" + minute + ":" + second
                    + "  ***************\n");
            try {
                PackageInfo pi = getPackageManager().getPackageInfo(
                        this.getPackageName(), );
                exceptionHeader = exceptionHeader + "version:" + pi.versionCode
                        + ",versionName:" + pi.versionName + "\n";
            } catch (Exception e) {
                e.printStackTrace();
            }
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ex.printStackTrace();
            ex.printStackTrace(new PrintStream(baos));
            exceptionHeader = exceptionHeader.replaceAll("\n", "</br>");
            /*Api.getInstance(getApplicationContext()).requestNet(ApiIdConstants.APIID_UPLOADCREASHINFO, exceptionHeader,
                    "[email protected],[email protected]");*/
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
           

3.最后在application的oncreate（）方法中注册一下：

Thread.setDefaultUncaughtExceptionHandler(this);
           

这样文件就会保存在下边路径下，可以自定义路径

/**
     * //项目目录的根路径
     */
    public static String FOLDER_ROOT = Environment.getExternalStorageDirectory().getPath() + "/isip/";  
/**
     * //log所在目录
     */
    public static String FOLDER_EXCEPTION = FOLDER_ROOT + "exception_log/";