Thread中提供了一个UncaughtExceptionHandler接口能够获取应用的crash信息 该方法设置系统的默认异常处理器，发生crash的时候，系统就会回调UncaughtExceptionHandler的uncaughtException(Thread t, Throwable e) 我们可以在uncaughtException方法中获取到crash信息，也可以选择把异常信息存储到本地以及上传到服务器提供给开发人员分析。
public class CrashHandler implements Thread.UncaughtExceptionHandler { private static final String TAG = "CrashHandler"; private static final String PATH = Environment.getExternalStorageDirectory() + "/crash/log/"; private Context mContext; private volatile static CrashHandler mCrashHandler; private Thread.UncaughtExceptionHandler mDefaultHandler; private CrashHandler() { } public static CrashHandler getInstance() { if (mCrashHandler == null) { synchronized (CrashHandler.class) { if (mCrashHandler == null) { mCrashHandler = new CrashHandler(); } } } return mCrashHandler; } public void init(Context context) { mContext = context.getApplicationContext(); mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler(); Thread.setDefaultUncaughtExceptionHandler(this); } @Override public void uncaughtException(Thread t, Throwable e) { dumpExceptionToFile(e); uploadExceptionToServer(); if (mDefaultHandler != null) { //系统默认的异常处理器来处理,否则由自己来处理 mDefaultHandler.uncaughtException(t, e); } else { android.os.Process.killProcess(android.os.Process.myPid()); System.exit(1); } } //可以根据自己需求来,比如获取手机厂商、型号、系统版本、内存大小等等 private void dumpExceptionToFile(Throwable e) { File dir = new File(PATH); if (!dir.exists()) { dir.mkdirs(); } long timeMillis = System.currentTimeMillis(); String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(timeMillis)); File file = new File(PATH + time + ".trace"); try { PrintWriter pw = new PrintWriter(new BufferedWriter(new FileWriter(file))); pw.println(time); pw.print("Android版本号 :"); pw.println(Build.VERSION.RELEASE); pw.print("手机型号 :"); pw.println(Build.MODEL); pw.print("CUP架构 :"); pw.println(Build.CPU_ABI); e.printStackTrace(pw); pw.close(); } catch (IOException ex) { Log.e(TAG, "dump crash info error"); } } // 上传到Server private void uploadExceptionToServer() { // TODO } } public class CrashApplication extends Application { @Override public void onCreate() { super.onCreate(); // 在这里为程序设置异常处理，才能捕获到未处理的异常 CrashHandler crashHandler = CrashHandler.getInstance(); crashHandler.init(getApplicationContext()); } }在Activity模拟一下异常，看程序是如何处理的
public class MainActivity extends AppCompatActivity implements View.OnClickListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.button).setOnClickListener(this); } @Override public void onClick(View v) { if (v != null) { throw new RuntimeException("自定义异常,模拟抛出异常~"); } } }CrashHandler 创建了异常信息文件，在手机打开文件很方便的查看手机信息和异常信息。
