Android 如何自定义CrashHandler与崩溃后自动重启

为什么要捕获Crash信息：

开发阶段，我们会使用Monitor查看logcat 信息，但由于很多原因，Android Monitor抓不到logcat信息。 因此需要一个CrashHandler来将Crash写入到本地或者上传到服务器方便我们分析。
线上应用：
崩溃率是衡量应用稳定性的重要标准，那么应用上线以后 我们无法向用户借手机来分析崩溃原因。为了减低崩溃率，这个时候需要CrashHandler 来帮我们将崩溃信息返回给后台，以便及时修复。

如何捕获捕获Crash分如下三步：

1、实现Thread.UncaughtExceptionHandler接口，并重写uncaughtException方法，在uncaughtException 方法中接收异常信息
2、调用Thread.setDefaultUncaughtExceptionHandler(CrashHandler) ,来使用我们自定义的CrashHandler来取代系统默认的CrashHandler
3、异常信息的获取、本地写入以及异常信息的上传

首先贴自定义的RCrashHandler

/**
* Created by Owen Chan
* On 2017-06-07.
*/

public class CrashHandler implements Thread.UncaughtExceptionHandler {

    private static CrashHandler INSTANCE;
    private static Context mContext;

    private static PendingIntent restartIntent;

    private Thread.UncaughtExceptionHandler mDefaultHandler;
    private CrashUploader crashUploader;

   private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    public static final String EXCEPTION_INFO = "EXCEPTION_INFO";
    public static final String PACKAGE_INFO = "PACKAGE_INFO";
    public static final String DEVICE_INFO = "DEVICE_INFO";
    public static final String SYSTEM_INFO = "SYSTEM_INFO";
    public static final String SECURE_INFO = "SECURE_INFO";
    public static final String MEM_INFO = "MEM_INFO";



    private String mExceptionInfo;
    private String mMemInfo;

    private ConcurrentHashMap mPackageInfo = new ConcurrentHashMap<>();
    private ConcurrentHashMap mDeviceInfo = new ConcurrentHashMap<>();
    private ConcurrentHashMap mSystemInfo = new ConcurrentHashMap<>();
    private ConcurrentHashMap mSecureInfo = new ConcurrentHashMap<>();

    private ConcurrentHashMap totalInfo = new ConcurrentHashMap<>();



    private CrashHandler() {

    }

    public static CrashHandler getInstance() {
        if (INSTANCE == null) {
            synchronized (CrashHandler.class) {
                if (INSTANCE == null) {
                    INSTANCE = new CrashHandler();
                }
            }
        }
        return INSTANCE;
    }

    public void init(Context context, CrashUploader crashUploader, PendingIntent pendingIntent) {
        mContext = context;
        this.crashUploader = crashUploader;
        this.restartIntent = pendingIntent;
        //保存一份系统默认的CrashHandler
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //使用我们自定义的异常处理器替换程序默认的
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * @param t 出现未捕获异常的线程
     * @param e 未捕获的异常，有了这个ex，我们就可以得到异常信息
     */
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        if (!catchCrashException(e) && mDefaultHandler != null) {
            //没有自定义的CrashHandler的时候就调用系统默认的异常处理方式
            mDefaultHandler.uncaughtException(t, e);
        } else {
            //退出应用
            killProcess();
        }
    }


    /**
     * 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 ex 未捕获的异常
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean catchCrashException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(ClientApp.getInstance().getApplicationContext(), "Duang~~崩啦~~崩啦~~~~", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();
        collectInfo(ex);
        //保存日志文件
        saveCrashInfo2File();
        //上传崩溃信息
        uploadCrashMessage(totalInfo);

        return true;
    }

    /**
     * 退出应用
     */
    private static void killProcess() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            Log.e("application", "error : ", e);
        }
        // 退出程序
        AlarmManager mgr = (AlarmManager) ClientApp.getInstance().getApplicationContext().getSystemService(Context.ALARM_SERVICE);
        mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 2000, restartIntent); // 2秒钟后重启应用
        Process.killProcess(Process.myPid());
        System.exit(1);
    }


    /**
     * 获取异常信息和设备参数信息
     */
    private void collectInfo(Throwable ex) {
        mExceptionInfo = collectExceptionInfo(ex);
        collectPackageInfo();
        collectBuildInfos();
        collectSystemInfos();
        collectSecureInfo();
        mMemInfo = collectMemInfo();

        totalInfo.put(EXCEPTION_INFO, mExceptionInfo);
        totalInfo.put(PACKAGE_INFO, mPackageInfo);
        totalInfo.put(DEVICE_INFO, mDeviceInfo);
        totalInfo.put(SYSTEM_INFO, mSecureInfo);
        totalInfo.put(SECURE_INFO, mSecureInfo);
        totalInfo.put(MEM_INFO, MEM_INFO);
    }

    /**
     * 获取捕获异常的信息
     */
    private String collectExceptionInfo(Throwable ex) {
        Writer mWriter = new StringWriter();
        PrintWriter mPrintWriter = new PrintWriter(mWriter);
        ex.printStackTrace(mPrintWriter);
        ex.printStackTrace();
        Throwable mThrowable = ex.getCause();
        // 迭代栈队列把所有的异常信息写入writer中
        while (mThrowable != null) {
            mThrowable.printStackTrace(mPrintWriter);
            // 换行 每个个异常栈之间换行
            mPrintWriter.append("\r\n");
            mThrowable = mThrowable.getCause();
        }
        // 记得关闭
        mPrintWriter.close();
        return mWriter.toString();
    }

    /**
     * 获取应用包参数信息
     */
    private void collectPackageInfo() {
        try {
            // 获得包管理器
            PackageManager mPackageManager = mContext.getPackageManager();
            // 得到该应用的信息，即主Activity
            PackageInfo mPackageInfo = mPackageManager.getPackageInfo(mContext.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (mPackageInfo != null) {
                String versionName = mPackageInfo.versionName == null ? "null" : mPackageInfo.versionName;
                String versionCode = mPackageInfo.versionCode + "";
                this.mPackageInfo.put("VersionName", versionName);
                this.mPackageInfo.put("VersionCode", versionCode);
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * 从系统属性中提取设备硬件和版本信息
     */
    private void collectBuildInfos() {
        // 反射机制
        Field[] mFields = Build.class.getDeclaredFields();
        // 迭代Build的字段key-value 此处的信息主要是为了在服务器端手机各种版本手机报错的原因
        for (Field field : mFields) {
            try {
                field.setAccessible(true);
                mDeviceInfo.put(field.getName(), field.get("").toString());
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 获取系统常规设定属性
     */
    private void collectSystemInfos() {
        Field[] fields = Settings.System.class.getFields();
        for (Field field : fields) {
            if (!field.isAnnotationPresent(Deprecated.class)
                    && field.getType() == String.class) {
                try {
                    String value = Settings.System.getString(mContext.getContentResolver(), (String) field.get(null));
                    if (value != null) {
                        mSystemInfo.put(field.getName(), value);
                    }
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 获取系统安全设置信息
     */
    private void collectSecureInfo() {
        Field[] fields = Settings.Secure.class.getFields();
        for (Field field : fields) {
            if (!field.isAnnotationPresent(Deprecated.class)
                    && field.getType() == String.class
                    && field.getName().startsWith("WIFI_AP")) {
                try {
                    String value = Settings.Secure.getString(mContext.getContentResolver(), (String) field.get(null));
                    if (value != null) {
                        mSecureInfo.put(field.getName(), value);
                    }
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 获取内存信息
     */
    private String collectMemInfo() {
        BufferedReader br = null;
        StringBuffer sb = new StringBuffer();

        ArrayList commandLine = new ArrayList<>();
        commandLine.add("cat");
        commandLine.add("/proc/meminfo");
        commandLine.add(Integer.toString(Process.myPid()));
        try {
            java.lang.Process process = Runtime.getRuntime()
                    .exec(commandLine.toArray(new String[commandLine.size()]));
            br = new BufferedReader(new InputStreamReader(process.getInputStream()), 1024);

            while (true) {
                String line = br.readLine();
                if (line == null) {
                    break;
                }
                sb.append(line);
                sb.append("\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return sb.toString();
    }

    /**
     * 将崩溃日志信息写入本地文件
     */
    private String saveCrashInfo2File() {
        StringBuffer mStringBuffer = getInfoStr(mPackageInfo);
        mStringBuffer.append(mExceptionInfo);
        // 保存文件，设置文件名
        String mTime = formatter.format(new Date());
        String mFileName = "crash-" + mTime + ".log";
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            try {
                File mDirectory = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/hive-crash");
                if (!mDirectory.exists()) {
                   boolean success = mDirectory.mkdirs();
                }
                FileOutputStream mFileOutputStream = new FileOutputStream(mDirectory + File.separator + mFileName);
                mFileOutputStream.write(mStringBuffer.toString().getBytes());
                mFileOutputStream.close();
                return mFileName;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * 将HashMap遍历转换成StringBuffer
     */
    @NonNull
    private static StringBuffer getInfoStr(ConcurrentHashMap info) {
        StringBuffer mStringBuffer = new StringBuffer();
        for (Map.Entry entry : info.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            mStringBuffer.append(key + "=" + value + "\r\n");
        }
        return mStringBuffer;
    }

    /**
     * 上传崩溃信息到服务器
     */
    private void uploadCrashMessage(ConcurrentHashMap info) {
        crashUploader.uploadCrashMessage(info);
    }

    /**
     * 崩溃信息上传接口回调
     */
    public interface CrashUploader {
        void uploadCrashMessage(ConcurrentHashMap info);
    }
}

Application 中的初始化：

/**
 * Created by Owen Chan
 * On 2017-06-07.
 */

public class ClientApp extends Application {

    private static ClientApp INSTANCE;
    private PendingIntent restartIntent;


    @Override
    public void onCreate() {
        super.onCreate();
        CrashHandler.CrashUploader crashUploader = new CrashHandler.CrashUploader() {

            @Override
            public void uploadCrashMessage(ConcurrentHashMap info) {
        //这个地方自定义崩溃信息的上传
            }
        };
        INSTANCE = this;
        // 以下用来捕获程序崩溃异常
        Intent intent = new Intent();
        intent.setClassName("com.owen.crashhandler", "com.owen.crashhandler.main.MainActivity");
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        restartIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);

        CrashHandler.getInstance().init(this, crashUploader, restartIntent);
    }


    public synchronized static ClientApp getInstance() {
        return INSTANCE;
    }

}