添加异常信息的收集之后，当APK出现异常崩溃，会收集异常信息，以及体现用户用户当前APK出现异常

1、核心类：CrashHandler

/**
 * UncaughtException处理类,
 * 当程序发生Uncaught异常的时候,
 * 有该类来接管程序,
 * 并记录发送错误报告.(路径：sdcard/crash/yyyy-MM-dd-HH-mm-ss)
 */
public class CrashHandler implements UncaughtExceptionHandler {
    
    public static final String TAG = "CrashHandler";
    
    /**系统默认的UncaughtException处理类*/ 
    private UncaughtExceptionHandler mExceptionHandler;
    
    /**CrashHandler实例*/
    private static CrashHandler INSTANCE = new CrashHandler();
    
    /**程序的Context对象*/
    private Context mContext;
    
    /**用来存储设备信息和异常信息*/
    private Map<String, String> mInfos = new HashMap<String, String>();

    /**用于格式化日期,作为日志文件名的一部分*/
    private DateFormat mDateFormat = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /** 保证只有一个CrashHandler实例 */
    private CrashHandler() {
    }

    /** 获取CrashHandler实例 ,单例模式 */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     */
    public void init(Context context) {
        mContext = context;
        //获取系统默认的UncaughtException处理器
        mExceptionHandler = Thread.getDefaultUncaughtExceptionHandler();
        //设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread pThread, Throwable pThrowable) {
        if (!handleException(pThrowable) && mExceptionHandler != null) {
            //如果用户没有处理则让系统默认的异常处理器来处理
            mExceptionHandler.uncaughtException(pThread, pThrowable);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            //退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 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 pThrowable
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable pThrowable) {
        if (pThrowable == null) {
            return false;
        }
        //使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        //收集设备参数信息 
        collectDeviceInfo(mContext);
        //保存日志文件 
        saveCrashInfo2File(pThrowable);
        return true;
    }
    
    /**
     * 收集设备参数信息
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                mInfos.put("versionName", versionName);
                mInfos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                mInfos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 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 saveCrashInfo2File(Throwable ex) {
        
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : mInfos.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 {
            long timestamp = System.currentTimeMillis();
            String time = mDateFormat.format(new Date());
            String fileName = "crash-" + time + "-" + timestamp + ".log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path = "/sdcard/crash/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }
}

2、使用方法：在项目的Application类中

    @Override
    public void onCreate() {
        super.onCreate();
        // 获取Context
        sContexts = getApplicationContext();

        //开启异常管理
        CrashHandler crashHandler = CrashHandler.getInstance();
        crashHandler.init(getApplicationContext());
    }