今天看到迅雷动漫里面一个CrashHandler 的类，我猜是崩溃处理类。进去一看。果然。顺便学习一下。

Android系统的“程序异常退出”，给应用的用户体验造成不良影响。为了捕获应用执行时异常并给出友好提示，便可继承类来处理。

通过Thread.setDefaultUncaughtExceptionHandler()方法将异常处理类设置到线程上就可以。

代码：

public class CrashHandler implements UncaughtExceptionHandler {    private static final Logger LOG = Logger.getLogger(CrashHandler.class);    private final Application mApplication;    private Handler mUIHandler;    private Thread mUiThread;    public CrashHandler(Application app) {        mApplication = app;        mUIHandler = new Handler();        mUiThread = Thread.currentThread();    }    @Override    public void uncaughtException(Thread thread, Throwable e) {        LOG.error(e);        Throwable cause = e.getCause();        while (cause != null) {            LOG.error(cause);            cause = cause.getCause();        }        writeCrashInfoToFile(e);        if (Thread.currentThread() != mUiThread) {            mUIHandler.post(new Runnable() {                @Override                public void run() {                    mApplication.onTerminate();                }            });        } else {            mApplication.onTerminate();        }    }    private void writeCrashInfoToFile(Throwable t) {        StringWriter sw = new StringWriter();        PrintWriter pw = new PrintWriter(sw);        t.printStackTrace(pw);        Throwable cause = t.getCause();        while (cause != null) {            cause.printStackTrace(pw);            cause = cause.getCause();        }        String crashInfo = sw.toString();        pw.close();        try {            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {                File file = mApplication.getApplicationContext().getExternalCacheDir();                if (file != null) {                    file = FileUtils.getFile(file, "crash");                    file.mkdirs();                    FileUtils.writeStringToFile(FileUtils.getFile(file, "crash.log"), crashInfo);                }            }        } catch (IOException e) {            LOG.warn(e);        }    }}

两个能够看的參考：

代码是自己的。尽管简单，算我是原创吧。不然。真的非常难装逼。