Android应用总是会不可避免的发生crash，也就是崩溃。Android提供了处理这类问题的方法，当crash发生的时候，系统就会回调UncaughtExceptionHandler的uncaughtException方法。在uncaughtException方法中就可以获取到异常信息，可以选择将异常信息存储到sd卡，然后在合适的时候将其上传到服务器。

实现方法：

<1> 创建一个类CrashHanlder继承UnCaughtExceptionHandler,实现里面的uncaughtException方法

 public class CrashHandler implements Thread.UncaughtExceptionHandler {

     private static CrashHandler crashHandler;
     private Context context;
     private Thread.UncaughtExceptionHandler mDefaultCrashHandler;
     private static final String PATH = Environment.getExternalStorageDirectory().getPath() + "/crash/log/";
     private static final String FILE_NAME = "crash";
     private static final String FILE_NAME_SUFFIX = ".trace";

     public static CrashHandler getInstance(){

         if(crashHandler == null){
             crashHandler = new CrashHandler();
         }
         return crashHandler;
     }

     public void init(Context context){
         context = context.getApplicationContext();
         //设置系统默认异常处理器
         Thread.setDefaultUncaughtExceptionHandler(this);
         mDefaultCrashHandler = Thread.getDefaultUncaughtExceptionHandler();
     }

     @Override
     public void uncaughtException(Thread t, Throwable e) {
         try {
             //将异常信息导出到SD卡中
             dumpExceptionToSDCard(e);
//               //上传异常信息到服务器，以便开发人员分析
//               uploadExceptionToServer();
         }catch (Exception e1){
             e1.printStackTrace();
         }
         e.printStackTrace();
         
		 if(mDefaultCrashHandler != null){
             mDefaultCrashHandler.uncaughtException(t,e);
         }else{
             Process.killProcess(Process.myPid());
         }

     }

     private void dumpExceptionToSDCard(Throwable ex) throws Exception{
         //判断SD卡是否存在或能否使用，不存在或无法使用就返回
         if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
             return;
         }

         File dir = new File(PATH);
         if(!dir.exists()){
             dir.mkdirs();
         }
         long current = System.currentTimeMillis();
         String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(current));
         File file = new File(PATH + FILE_NAME + time + FILE_NAME_SUFFIX);
         if(!file.exists()){
             file.createNewFile();
         }
     PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(file)));
     pw.println(time);
     dumpPhoneInfo(pw);
     pw.println();
     ex.printStackTrace(pw);
    }

     private void dumpPhoneInfo(PrintWriter pw) throws PackageManager.NameNotFoundException {
         PackageManager pm = context.getPackageManager();
         PackageInfo pi = pm.getPackageInfo(context.getPackageName(),PackageManager.GET_ACTIVITIES);
         pw.println("APP Version");
         pw.println(pi.versionName);
         pw.println("_");
         pw.println(pi.versionCode);

         //Android版本号
         pw.println("OS Version: ");
         pw.println(Build.VERSION.RELEASE);
         pw.println("_");
         pw.println(Build.VERSION.SDK_INT);

         //手机制造商
         pw.println("Vendor:");
         pw.println(Build.MANUFACTURER);

         //手机号
         pw.println("Model:");
         pw.println(Build.MODEL);

         //CPU架构
         pw.println("CPU ABI:");
         pw.println(Build.CPU_ABI);
     }
 }	

<2> 在Application的onCreate方法中调用

     CrashHandler crashHandler = CrashHandler.getInstance();
	 crashHandler.init(this);