Android进阶之路 - 捕获异常崩溃后重新自启动App

前情提要：三个版本之间完全解耦，可独立查看任一版本； 篇中版本之间的代码重复率在百分之90以上，只是争对不同场景，做了归纳 ~

篇中归纳皆来自多篇网络Blog，只是在其基础上进行效果实验，整合之后写出自己的想法 ，方便予己 ~

经检测针对 Android 9.0 系统，代码有效，可实现我们的需求效果 ~

• 简洁版代码较少，基本均为必要代码；
• 业务版主要针对需要上传App奔溃错误到后台的需求；
• 封装版适用项目，解耦的同时也方便管理；

效果 - 封装版

简洁版

基础配置

初始化 - Application

MyApplication

package nk.com.restartapp;

import android.app.Activity;
import android.app.Application;
import android.content.Context;

import java.util.ArrayList;
import java.util.List;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc
 */
public class MyApplication extends Application {
    private static Context context;
    List<Activity> activityList = new ArrayList<>();

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();
    }

    /**
     * context
     */
    public static Context getContext() {
        return context;
    }

    public void init() {
        // 设置该CrashHandler为程序的默认处理器
        CrashHandler unCeHandler = new CrashHandler(this);
        Thread.setDefaultUncaughtExceptionHandler(unCeHandler);
    }

    /**
     * @param activity activity关闭时，删除Activity列表中的Activity对象
     */
    public void removeActivity(Activity activity) {
        activityList.remove(activity);
    }

    /**
     * @param activity 向列表中添加Activity对象
     */
    public void addActivity(Activity activity) {
        activityList.add(activity);
    }

    /**
     * 关闭Activity列表中的 所有Activity
     */
    public void finishAllActivity() {
        for (Activity activity : activityList) {
            if (null != activity) {
                activity.finish();
            }
        }
        // 杀死应用进程
        android.os.Process.killProcess(android.os.Process.myPid());
    }
}

清单注册

application内注册我们自己的application

android:name=".MyApplication"

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="nk.com.restartapp">

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>

manifest>

捕获异常

CrashHandler

package nk.com.restartapp;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc 捕获异常
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    MyApplication application;

    public CrashHandler(MyApplication myApplication) {
        // // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        this.application = myApplication;
    }

    /**
     * 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
     * @return true:如果处理了该异常信息;否则返回false.
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handlerException(ex) && mDefaultHandler != null) {
            // 若果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                Log.e("CatchExcep", "error ;", e);
            }
            // 重启app
            Intent intent = new Intent(application.getApplicationContext(), MainActivity.class);
//            PendingIntent restartIntent = PendingIntent.getActivity(application.getApplicationContext(), 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK);
            PendingIntent restartIntent = PendingIntent.getActivity(MyApplication.getContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            // 退出程序
            AlarmManager mgr = (AlarmManager) application.getSystemService(Context.ALARM_SERVICE);
            // 3秒后重启
            mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 3000, restartIntent);
            application.finishAllActivity();
        }
    }

    /**
     * 获取具体异常，此处可做崩溃前的处理
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handlerException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 发个友好的提示，弹个土司 - 此处只是为了效果，可进行注释或替换为自己的逻辑代码
        new Thread() {
            public void run() {
                Looper.prepare();
                Toast.makeText(application.getApplicationContext(), "检测到程序异常，即将退出", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();
        return true;
    }
}

使用方式

MainActivity

package nk.com.restartapp;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 检测程序异常
        CatchExcApplication();
    }

    /**
     * 检测程序异常，重启
     */
    public void CatchExcApplication() {
        // 添加程序异常检测
        MyApplication application = (MyApplication) getApplication();
        application.init();
        application.addActivity(this);
    }
}

---

业务版

百分之90的代码相同，唯一不同的是CrashHandler（异常）的一个处理方式，在这个版本中可以在APP崩溃之前将错误上传到后台，主要用于及时定位问题 ； 不过题外话一下，其实现在有很多方式可以三方平台的SDK可以进行错误收集 ~

基础配置

初始化 - Application

MyApplication

package nk.com.startappdemo;

import android.app.Activity;
import android.app.Application;
import android.content.Context;

import java.util.ArrayList;
import java.util.List;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc
 */
public class MyApplication extends Application {
    private static Context context;
    List<Activity> activityList = new ArrayList<>();

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();
    }

    /**
     * context
     */
    public static Context getContext() {
        return context;
    }

    public void init() {
        // 设置该CrashHandler为程序的默认处理器
        CrashHandler unCeHandler = new CrashHandler(this);
        Thread.setDefaultUncaughtExceptionHandler(unCeHandler);
    }

    /**
     * @param activity activity关闭时，删除Activity列表中的Activity对象
     */
    public void removeActivity(Activity activity) {
        activityList.remove(activity);
    }

    /**
     * @param activity 向列表中添加Activity对象
     */
    public void addActivity(Activity activity) {
        activityList.add(activity);
    }

    /**
     * 关闭Activity列表中的 所有Activity
     */
    public void finishAllActivity() {
        for (Activity activity : activityList) {
            if (null != activity) {
                activity.finish();
            }
        }
        // 杀死应用进程
        android.os.Process.killProcess(android.os.Process.myPid());
    }
}

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="nk.com.startappdemo">

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>

manifest>

捕获异常

CrashHandler

package nk.com.startappdemo;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @author MrLiu
 * @date 2020/5/12
 * desc 异常捕获处理 ~
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {
    public static final String TAG = "CrashHandler";

    private static CrashHandler INSTANCE = new CrashHandler();
    /**
     * 系统默认的UncaughtException处理类
     **/
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    /**
     * 用来存储设备信息和异常信息
     **/
    private Map<String, String> mInfos = new HashMap<String, String>();

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


    public CrashHandler() {
    }

    public static CrashHandler getInstance() {
        return INSTANCE;
    }

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

    /**
     * @描述: 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                Log.e(this.getClass().toString(), e == null ? "" : e.toString());
            }

            // 重新启动应用
            Intent intent = new Intent(MyApplication.getContext(), MainActivity.class);
            PendingIntent restartIntent = PendingIntent.getActivity(MyApplication.getContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager mgr = (AlarmManager) MyApplication.getContext().getSystemService(Context.ALARM_SERVICE);
            // 1秒钟后重启应用
            mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent);

            // todo:退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * @return true:如果处理了该异常信息;否则返回false.
     * @throws
     * @描述: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.
     */
    private boolean handleException(Throwable ex) {
        if (null == ex) {
            return false;
        }
        // 使用Toast来显示异信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(MyApplication.getContext(), "程序开了个小差，即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(MyApplication.getContext());
        // 保存日志文件
        saveCrashInfo2File(ex);
        return true;
    }

    /**
     * @描述:收集设备参数信息
     */
    private void collectDeviceInfo(Context context) {
        try {
            PackageManager pm = context.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(context.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 (PackageManager.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);
            }
        }
    }

    /**
     * @throws
     * @描述:保存错误信息到文件中 目录/sdcard/qfangadtv/crash/
     * @返回类型 void 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 = mFormatter.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;
    }
}

使用方式

MainActivity

package nk.com.restartapp;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 检测程序异常
        CatchExcApplication();
    }

    /**
     * 检测程序异常，重启
     */
    public void CatchExcApplication() {
        // 添加程序异常检测
        MyApplication application = (MyApplication) getApplication();
        application.init();
        application.addActivity(this);
    }
}

---

封装版

基于项目开发原则进行二次简单封装，方便管理 ( Demo地址在此 ) ~

基础配置

初始化 - Application

MyApplication

package nk.com.restartapp;

import android.app.Activity;
import android.app.Application;
import android.content.Context;

import java.util.ArrayList;
import java.util.List;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc
 */
public class MyApplication extends Application {
    private static Context context;
    List<Activity> activityList = new ArrayList<>();

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();
        init();
    }

    /**
     * context
     */
    public static Context getContext() {
        return context;
    }

    public void init() {
        // 设置该CrashHandler为程序的默认处理器
        CrashHandler unCeHandler = new CrashHandler(this);
        Thread.setDefaultUncaughtExceptionHandler(unCeHandler);
    }

    /**
     * @param activity activity关闭时，删除Activity列表中的Activity对象
     */
    public void removeActivity(Activity activity) {
        activityList.remove(activity);
    }

    /**
     * @param activity 向列表中添加Activity对象
     */
    public void addActivity(Activity activity) {
        activityList.add(activity);
    }

    /**
     * 关闭Activity列表中的 所有Activity
     */
    public void finishAllActivity() {
        for (Activity activity : activityList) {
            if (null != activity) {
                activity.finish();
            }
        }
        // 杀死应用进程
        android.os.Process.killProcess(android.os.Process.myPid());
    }
}

清单注册

application内注册我们自己的application

android:name=".MyApplication"

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="nk.com.restartapp">

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
    application>

manifest>

捕获异常

CrashHandler

package nk.com.restartapp;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc 捕获异常
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    MyApplication application;

    public CrashHandler(MyApplication myApplication) {
        // // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        this.application = myApplication;
    }

    /**
     * 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
     * @return true:如果处理了该异常信息;否则返回false.
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handlerException(ex) && mDefaultHandler != null) {
            // 若果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                Log.e("CatchExcep", "error ;", e);
            }
            // 重启app
            Intent intent = new Intent(application.getApplicationContext(), MainActivity.class);
//            PendingIntent restartIntent = PendingIntent.getActivity(application.getApplicationContext(), 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK);
            PendingIntent restartIntent = PendingIntent.getActivity(MyApplication.getContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
            // 退出程序
            AlarmManager mgr = (AlarmManager) application.getSystemService(Context.ALARM_SERVICE);
            // 3秒后重启
            mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 3000, restartIntent);
            application.finishAllActivity();
        }
    }

    /**
     * 获取具体异常，此处可做崩溃前的处理
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handlerException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 发个友好的提示，弹个土司 - 此处只是为了效果，可进行注释或替换为自己的逻辑代码
        new Thread() {
            public void run() {
                Looper.prepare();
                Toast.makeText(application.getApplicationContext(), "检测到程序异常，即将退出", Toast.LENGTH_SHORT).show();
                Looper.loop();
            }
        }.start();
        return true;
    }
}

封装BaseActivity

BaseActivity

package nk.com.restartapp;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

/**
 * @author MrLiu
 * @date 2020/5/13
 * desc
 */
public class BaseActivity extends AppCompatActivity {

    private MyApplication application;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        application = (MyApplication) getApplication();
        // 添加 - 检测程序异常
        CatchExcApplication();
    }

    public void CatchExcApplication() {
        application.init();
        application.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        application.removeActivity(this);
    }
}

自造异常 - 测试效果

MainActivity

package nk.com.restartapp;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toast.makeText(this, "启动完成", Toast.LENGTH_SHORT).show();

        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                List<Object> list = new ArrayList<>();
            }
        });
    }
}

activity_main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:background="#ff7"
        android:gravity="center"
        android:textColor="#f42"
        android:text="自创崩溃 - 数据越界" />

LinearLayout>