众所周知，android的设备千差万别，难免会发生崩溃异常等现象，这个时候就需要捕获哪些崩溃异常了，也就是捕获崩溃异常的相关信息，并记录下来，这样一来方便开发人员和测试人员的分析与调试。
1.首先我们得创建一个处理崩溃异常的类，暂且命名为：CrashHandler吧。实现如下：
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 java.util.TimeZone; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; 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.Looper; import android.sax.StartElementListener; 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到log文件中. * * @author caizhiming */ public class CrashHandler implements UncaughtExceptionHandler { public static final String TAG = "CrashHandler"; // 系统默认的UncaughtException处理类 private Thread.UncaughtExceptionHandler mDefaultHandler; // CrashHandler实例 private static CrashHandler INSTANCE = 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<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 SimpleDateFormat formatter; /** * 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 * * @param context */ 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 */ @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 { // 退出程序 try { Thread.sleep(300); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } android.os.Process.killProcess(android.os.Process.myPid()); System.exit(1); } } /** * 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(final Throwable ex) { if (ex == null) { return false; } // Intent showcrashDLg = new Intent(mContext,CrashActivity.class); // mContext.startActivity(showcrashDLg); ex.printStackTrace(); // 使用Toast来显示异常信息 // 收集设备参数信息 collectDeviceInfo(mContext); // 保存日志文件 saveCrashInfoToFile(ex); 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 错误崩溃信息写到log文件中 */ private void saveCrashInfoToFile(Throwable ex) { StringBuffer sb = new StringBuffer(); sb.append("==============================Crash happened at Time：" + CommonUtils.getCurTime() + "==============================\r\n"); for (Map.Entry<String, String> entry : infos.entrySet()) { String key = entry.getKey(); String value = entry.getValue(); sb.append(key + "=" + value + "\r\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 { LogCore.addLog(sb.toString()); } catch (Exception e) { Log.e(TAG, "an error occured while writing file...", e); } Analyse.uplodcrash(sb.toString()); } /** * 用Dialog显示错误信息 * * @param ex * @return 用Dialog显示错误信息 */ private void showCrashInfoDialog(Throwable ex) { StringBuffer sb = new StringBuffer(); 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 { // DlgUtils.ShowDialog(mContext,"程序崩溃了"); // LogCore.d(mContext,sb.toString()); AlertDialog.Builder builder = new AlertDialog.Builder(mContext); builder.setTitle("程序崩溃啦~"); builder.setMessage(sb.toString()); builder.setPositiveButton("我知道了", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub android.os.Process.killProcess(android.os.Process.myPid()); System.exit(1); } }); // builder.create().show(); } catch (Exception e) { Log.e(TAG, "an error occured while writing file...", e); } } }
2.完成这个CrashHandler后，我们需要在一个Application环境中让其运行，为此，我们继承android.app.Application，添加自己的代码，CrashApplication.java代码如下：
package com.czm.crash; import android.app.Application; public class CrashApplication extends Application { @Override public void onCreate() { super.onCreate(); CrashHandler crashHandler = CrashHandler.getInstance(); crashHandler.init(getApplicationContext()); } }
3.除此之外，最后，为了让上面的CrashApplication取代android.app.Application的地位，在我们的代码中生效，我们需要修改AndroidManifest.xml：
<application android:name=".CrashApplication" ...> </application>