app运行中的crash崩溃异常日志收集

在Android开发中，一个app在推广后。我们怎么才能知道这个app运行的如何，有没有出现崩溃等问题。这也就是app数据监控的一部分。下面的这个就是介绍关于crash日志的收集。这个就是核心代码：

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 com.example.lianshou_test.MainActivity;import com.example.lianshou_test.base.BaseActivity;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.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";// 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 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() {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 */@Overridepublic void uncaughtException(Thread thread, Throwable ex) {if (ex != null && ex.getCause() != null&& ex.getCause().getMessage() != null&& ex.getCause().getMessage().contains("PDF file is corrupted")) {Log.e(TAG, "error : " + ex.getCause().getMessage());Looper.prepare();Toast.makeText(mContext, "该文件已经损坏，请检查！",Toast.LENGTH_SHORT).show();Looper.loop();// 收集设备参数信息collectDeviceInfo(mContext);// 保存日志文件saveCrashInfo2File(ex);} else {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(3000);} catch (InterruptedException e) {Log.e(TAG, "error : ", e);}Intent intent = new Intent(mContext.getApplicationContext(),MainActivity.class);PendingIntent restartIntent = PendingIntent.getActivity(mContext.getApplicationContext(), 0, intent,Intent.FLAG_ACTIVITY_NEW_TASK);// 退出程序AlarmManager mgr = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 1000,restartIntent); // 1秒钟后重启应用BaseActivity.getInstance().closeAll();// 退出程序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(Throwable ex) {if (ex == null) {return false;}// 使用Toast来显示异常信息new Thread() {@Overridepublic void run() {Looper.prepare();Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.",Toast.LENGTH_SHORT).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 *  * @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 saveCrashInfo2File(Throwable ex) {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)) {String path = Environment.getExternalStorageDirectory().getPath() + "/henry/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;}}

由于这个是在很多activity中会用到的。因此建议在appliction中进行初始化操作

CrashHandler crashHandler = CrashHandler.getInstance();crashHandler.init(getApplicationContext());

最后。我们在测试时对app制造一点运行崩溃的错误。如图：

这样就可以了。最后部分就是将这个log文件上传到服务器就ok了（这个上传的过程大家就自己写写。很简单）。

注意一点就是记得在代码中写个定时器定时清理这些log日志文件。比如一周自动清理一次都可以。