Android_MVP之错误异常信息收集处理 CrashHandler

程序出错开发者应该尽量避免。可设备种类数不胜数，如果出现了错误我们就应该正确收集出现错误异常的相关信息，
下面是本人在开发时写的一种收集方法。
先在Compontent包下创建CrashHandler.java并实现Thread.UncaughtExceptionHandler。

Thread.UncaughtExceptionHandler：线程未捕获异常处理器，用来处理未捕获异常。如果程序出现了未捕获异常，默认会弹出系统中强制关闭对话框。我们需要实现此接口，并注册为程序中默认未捕获异常处理。这样当未捕获异常发生时，就可以做一些个性化的异常处理操作。

CrashHandler.java 代码如下（详情看注释）：

import android.content.Context;import android.content.pm.PackageInfo;import android.content.pm.PackageManager;import android.os.Build;import com.example.chen.news2.app.App;import com.example.chen.news2.util.LogUtil;import com.example.chen.news2.util.ToastUtil;import java.io.PrintWriter;import java.io.StringWriter;import java.io.Writer;/** * Created by chen on 2017/7/21. *//** 全局处理异常* */public class CrashHandler implements Thread.UncaughtExceptionHandler{    public static Thread.UncaughtExceptionHandler defaultHandler = null;    private Context context = null;    public final  String TAG = CrashHandler.class.getSimpleName();    public CrashHandler(Context context){        this.context = context;    }    /*    * 初始化    * 设置该CrashHander为程序的默认处理器    * */    public static void init(CrashHandler crashHandler){        defaultHandler = Thread.getDefaultUncaughtExceptionHandler();        Thread.setDefaultUncaughtExceptionHandler(crashHandler);    }    /*    * 未处理异常    * */    @Override    public void uncaughtException(Thread thread, Throwable ex) {        System.out.println(ex.toString());        LogUtil.e(TAG,  ex.toString());        LogUtil.e(TAG, collectCrashDeviceInfo());        LogUtil.e(TAG,  getCrashInfo(ex));        //调用系统错误机制        defaultHandler.uncaughtException(thread,ex);        ToastUtil.shortShow("抱歉,程序发生异常即将退出");        App.getInstance().exitApp();    }    /*    * 得到程序崩溃的详细信息    * */    private String getCrashInfo(Throwable ex) {        Writer result = new StringWriter();        PrintWriter printWriter = new PrintWriter(result);        ex.setStackTrace(ex.getStackTrace());        ex.printStackTrace(printWriter);        return result.toString();    }    /*    * 收集程序崩溃的设备信息*/    private String collectCrashDeviceInfo() {        try {            PackageManager packageManager = context.getPackageManager();            PackageInfo packageInfo = packageManager.getPackageInfo(context.getPackageName(),PackageManager.GET_ACTIVITIES);            String VersionName = packageInfo.versionName;            String model = Build.MODEL;            String androidVersion = Build.VERSION.RELEASE;            String manufacturer = Build.MANUFACTURER;            return VersionName + " " + model+ " " + androidVersion + " " + manufacturer;        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return null;    }}

因为是MVP的结构我们还要写两个工具类，在util包下创建ToastUtil.java和LogUtil.java两个文件。前面是定义一个通知，告诉用户程序出了问题；后面是获取日志，方便反馈和开发者获得具体的错误情况。

ToastUtil.java 代码如下：

package com.example.chen.news2.util;import android.content.Context;import android.view.Gravity;import android.view.View;import android.widget.TextView;import android.widget.Toast;import com.example.chen.news2.R;import com.example.chen.news2.app.App;/** * Created by chen on 2017/7/21. */public class ToastUtil {    static ToastUtil td;    public static void show(int resId) {        show(App.getInstance().getString(resId));    }    public static void show(String msg) {        if (td == null) {            td = new ToastUtil(App.getInstance());        }        td.setText(msg);        td.create().show();    }    public static void shortShow(String msg) {        if (td == null) {            td = new ToastUtil(App.getInstance());        }        td.setText(msg);        td.createShort().show();    }    Context context;    Toast toast;    String msg;    public ToastUtil(Context context) {        this.context = context;    }    public Toast create() {        View contentView = View.inflate(context, R.layout.dialog_toast, null);        TextView tvMsg = (TextView) contentView.findViewById(R.id.tv_toast_msg);        toast = new Toast(context);        toast.setView(contentView);        toast.setGravity(Gravity.CENTER, 0, 0);        toast.setDuration(Toast.LENGTH_LONG);        tvMsg.setText(msg);        return toast;    }    public Toast createShort() {        View contentView = View.inflate(context, R.layout.dialog_toast, null);        TextView tvMsg = (TextView) contentView.findViewById(R.id.tv_toast_msg);        toast = new Toast(context);        toast.setView(contentView);        toast.setGravity(Gravity.CENTER, 0, 0);        toast.setDuration(Toast.LENGTH_SHORT);        tvMsg.setText(msg);        return toast;    }    public void show() {        if (toast != null) {            toast.show();        }    }    public void setText(String text) {        msg = text;    }}

LogUtil.java 代码如下：

package com.example.chen.news2.util;import com.orhanobut.logger.BuildConfig;import com.orhanobut.logger.Logger;/** * Created by chen on 2017/7/21. */public class LogUtil {    public static boolean isDebug = BuildConfig.DEBUG;    private static final String TAG = "com.example.chen.news2";    public static void e(String tag, Object o) {        if(isDebug) {            Logger.e(tag, o);        }    }    public static void e(Object o) {        LogUtil.e(TAG,o);    }    public static void w(String tag, Object o) {        if(isDebug) {            Logger.w(tag, o);        }    }    public static void w(Object o) {        LogUtil.w(TAG,o);    }    public static void d(String msg) {        if(isDebug) {            Logger.d(msg);        }    }    public static void i(String msg) {        if(isDebug) {            Logger.i(msg);        }    }}

最后还要在App包下App.java中初始化：

 //初始化日志        Logger.init(getPackageName()).hideThreadInfo();

  //初始化错误收集        CrashHandler.init(new CrashHandler(getApplicationContext()));

并且退出程序：

 public void exitApp() {        if (allActivities != null) {            synchronized (allActivities) {                for (Activity act : allActivities) {                    act.finish();                }            }        }        android.os.Process.killProcess(android.os.Process.myPid());        System.exit(0);    }

这是我的项目目录：