本文主要是介绍Android开发如何使用UncaughtExceptionHandler捕获程序崩溃错误信息？，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
关于UncaughtExceptionHandler这个异常接口的作用，我想对于大多数的APP来说一般都是为了给用户更好的体验，在我们程序崩溃时不让其直接报一个错误信息界面然后退出我们的应用程序，而是让我们的应用程序在崩溃时直接跳回到我们的应用程序首页
下面是博主在工作中的使用，主要是在我们应用程序崩溃退出时进行一个错误log分析，将错误信息保存到我们机器SD卡上，然后进行错误分析。代码如下：
package com.asir.mediaplayer;import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
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.content.Context;
import android.content.pm.ApplicationInfo;
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;public class CrashHandler implements UncaughtExceptionHandler {public static final String TAG = "CrashHandler";public static final String PATH_SD = "/mnt/sdcard/log/";// 系统默认的UncaughtException处理类private Thread.UncaughtExceptionHandler mDefaultHandler;// CrashHandler实例private static CrashHandler instance;// 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> infos = new HashMap<String, String>();// 用于格式化日期,作为日志文件名的一部分private DateFormat formatter = 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() {if (instance == null)instance = new CrashHandler();return instance;}/*** 初始化*/public void init(Context context) {mContext = context;// 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);}/*** 当UncaughtException发生时会转入该函数来处理*/@Overridepublic void uncaughtException(Thread thread, Throwable ex) {Log.e(TAG, "___________ erre start");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(5000);} catch (InterruptedException e) {Log.e(TAG, "error : ", e);}// 退出程序android.os.Process.killProcess(android.os.Process.myPid());System.exit(1);}}public String getApplicationName() {PackageManager packageManager = null;ApplicationInfo applicationInfo = null;try {packageManager = mContext.getApplicationContext().getPackageManager();applicationInfo = packageManager.getApplicationInfo(mContext.getPackageName(), 0);} catch (PackageManager.NameNotFoundException e) {applicationInfo = null;}String applicationName = (String) packageManager.getApplicationLabel(applicationInfo);return applicationName;}/*** 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.*/private boolean handleException(Throwable ex) {if (ex == null) {return false;}// 收集设备参数信息collectDeviceInfo(mContext);// 使用Toast来显示异常信息new Thread() {@Overridepublic void run() {Looper.prepare();String applicationName = getApplicationName();applicationName += "程序出现异常,即将退出";Toast.makeText(mContext, applicationName, Toast.LENGTH_LONG).show();Looper.loop();}}.start();// 保存日志文件saveCatchInfo2File(ex, PATH_SD);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 + "";infos.put("versionName", versionName);infos.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);infos.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 saveCatchInfo2File(Throwable ex, String path) {StringBuffer sb = new StringBuffer();for (Map.Entry<String, String> entry : infos.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 = formatter.format(new Date());String fileName = "crash-" + time + "-" + timestamp + ".log";if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File dir = new File(path);if (!dir.exists()) {dir.mkdirs();}FileOutputStream fos = new FileOutputStream(path + fileName);fos.write(sb.toString().getBytes());Log.e(TAG, "___________wirt erre info");// 发送给开发人员// sendCrashLog2PM(path+fileName);fos.close();}return fileName;} catch (Exception e) {Log.e(TAG, "an error occured while writing file...", e);}return null;}
/*** 将捕获的导致崩溃的错误信息发送给开发人员* * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。*/private void sendCrashLog2PM(String fileName) {if (!new File(fileName).exists()) {Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();return;}FileInputStream fis = null;BufferedReader reader = null;String s = null;try {fis = new FileInputStream(fileName);reader = new BufferedReader(new InputStreamReader(fis, "GBK"));while (true) {s = reader.readLine();if (s == null)break;// 由于目前尚未确定以何种方式发送，所以先打出log日志。Log.i("info", s.toString());}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally { // 关闭流try {reader.close();fis.close();} catch (IOException e) {e.printStackTrace();}}}}这个类相当的简单，没什么好解释的了! 那么用法如下，在我们的工程目录自己创建的Application的oncreate方法中执行下面的代码即可：
CrashHandler catchHandler = CrashHandler.getInstance();catchHandler.init(this);这篇关于Android开发如何使用UncaughtExceptionHandler捕获程序崩溃错误信息？的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
