Android程序异常崩溃后重启

有时候&＃xff0c;我们需要应用在崩溃的时候自动重启&＃xff0c;并打开崩溃前的那个Activity。

这时候&＃xff0c;我们就需要用到Thread.UncaughtExceptionHandler这个接口。

首先&＃xff0c;我们知道&＃xff0c;既然是要在整个Application的生命周期范围内都有效&＃xff0c;那么我们也应该在Application中绑定它。这里有两个做法&＃xff1a;

1.程序的Application实现这个接口&＃xff1a;

package com.example.msi_cn.myapplication;import android.app.ActivityManager;
import android.app.Application;
import android.content.Intent;/*** Created by afei on 2016/6/4.*/
public class MyApplication extends Application implements Thread.UncaughtExceptionHandler {&＃64;Overridepublic void onCreate() {super.onCreate();Thread.setDefaultUncaughtExceptionHandler(this);}&＃64;Overridepublic void uncaughtException(Thread thread, Throwable ex) {Intent intent &＃61; new Intent(this, getTopActivity());intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);android.os.Process.killProcess(android.os.Process.myPid());}/*** 获取栈中最顶部的Activity&＃xff0c;即最后发生崩溃的Activity。* 如果你只需要打开MainActivity等固定的Activity则无需使用此方法*/public Class getTopActivity() {ActivityManager manager &＃61; (ActivityManager) getSystemService(ACTIVITY_SERVICE);String className &＃61; manager.getRunningTasks(1).get(0).topActivity.getClassName();Class cls &＃61; null;try {cls &＃61; Class.forName(className);} catch (ClassNotFoundException e) {e.printStackTrace();}return cls;}
}

2.自定义类实现此接口&＃xff0c;在MyApplication中绑定&＃xff0c;如&＃xff1a;

package com.example.msi_cn.myapplication;import android.app.Application;/*** Created by afei on 2016/6/4.*/
public class MyApplication extends Application {&＃64;Overridepublic void onCreate() {super.onCreate();CrashHandler.getInstance().init(this); // 一定要先初始化Thread.setDefaultUncaughtExceptionHandler(CrashHandler.getInstance());}}

这里我们使用了一个自定义的CrashHandler类来处理

package com.example.msi_cn.myapplication;import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
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;import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;/*** 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.*/
public class CrashHandler implements UncaughtExceptionHandler {public static final String TAG &＃61; "CrashHandler";// 系统默认的UncaughtException处理类private Thread.UncaughtExceptionHandler mDefaultHandler;// CrashHandler实例private static CrashHandler INSTANCE &＃61; 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 infos &＃61; new HashMap();// 用于格式化日期,作为日志文件名的一部分private DateFormat formatter &＃61; 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** &＃64;param context*/public void init(Context context) {mContext &＃61; context;// 获取系统默认的UncaughtException处理器mDefaultHandler &＃61; 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*/&＃64;Overridepublic void uncaughtException(Thread thread, Throwable ex) {if (!handleException(ex) && mDefaultHandler !&＃61; 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(1000); // 1秒后重启&＃xff0c;可有可无&＃xff0c;仅凭个人喜好Intent intent &＃61; new Intent(mContext, getTopActivity());intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);mContext.startActivity(intent);} catch (InterruptedException e) {Log.e(TAG, "error : ", e);}// 退出程序android.os.Process.killProcess(android.os.Process.myPid());System.exit(0);}}public Class getTopActivity() {ActivityManager manager &＃61; (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE);String className &＃61; manager.getRunningTasks(1).get(0).topActivity.getClassName();Class cls &＃61; null;try {cls &＃61; Class.forName(className);} catch (ClassNotFoundException e) {e.printStackTrace();}return cls;}/*** 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.* &＃64;return true:如果处理了该异常信息;否则返回false.*/private boolean handleException(Throwable ex) {if (ex &＃61;&＃61; null) {return false;}// 使用Toast来显示异常信息new Thread() {&＃64;Overridepublic void run() {Looper.prepare();Toast.makeText(mContext, "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(ex);return true;}/*** 收集设备参数信息*/public void collectDeviceInfo(Context ctx) {try {PackageManager pm &＃61; ctx.getPackageManager();PackageInfo pi &＃61; pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);if (pi !&＃61; null) {String versionName &＃61; pi.versionName &＃61;&＃61; null ? "null" : pi.versionName;String versionCode &＃61; pi.versionCode &＃43; "";infos.put("versionName", versionName);infos.put("versionCode", versionCode);}} catch (NameNotFoundException e) {Log.e(TAG, "an error occured when collect package info", e);}Field[] fields &＃61; Build.class.getDeclaredFields();for (Field field : fields) {try {field.setAccessible(true);infos.put(field.getName(), field.get(null).toString());Log.d(TAG, field.getName() &＃43; " : " &＃43; 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&＃xff0c;需要有对SD的读写权限&＃xff01;** &＃64;param ex* &＃64;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 &＃61; new StringBuffer();for (Map.Entry entry : infos.entrySet()) {String key &＃61; entry.getKey();String value &＃61; entry.getValue();sb.append(key &＃43; "&＃61;" &＃43; value &＃43; "\n");}Writer writer &＃61; new StringWriter();PrintWriter printWriter &＃61; new PrintWriter(writer);ex.printStackTrace(printWriter);Throwable cause &＃61; ex.getCause();while (cause !&＃61; null) {cause.printStackTrace(printWriter);cause &＃61; cause.getCause();}printWriter.close();String result &＃61; writer.toString();sb.append(result);try {long timestamp &＃61; System.currentTimeMillis();String time &＃61; formatter.format(new Date());String fileName &＃61; "crash-" &＃43; time &＃43; "-" &＃43; timestamp &＃43; ".log"; // 崩溃日志的文件if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {String path &＃61; "/sdcard/crash/"; // 崩溃日志的存储路径File dir &＃61; new File(path);if (!dir.exists()) {dir.mkdirs();}FileOutputStream fos &＃61; new FileOutputStream(path &＃43; 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;}
}

当然&＃xff0c;这个工具类还做了很多其他的事&＃xff0c;包括Toast提示用户程序异常&＃xff0c;收集设备信息输出崩溃日记&＃xff08;SD读写权限&＃xff09;&＃xff0c;程序重启等。根据个人爱好定制自己的处理方式都可以。

重要的是我们可以通过继承Thread.UncaughtExceptionHandler这个接口的方式来实现程序崩溃重庆