為Android程式設定全域性的捕獲異常,提升使用者體驗(UncaughtExceptionHandler捕獲全域性異常)
阿新 • • 發佈:2019-01-08
主要方法:通過Thread.setDefaultUncaughtExceptionHandler()方法將異常處理類設定到執行緒上即可。
實現類
public class CrashHandler implements UncaughtExceptionHandler { public static final String TAG = "CrashHandler"; //系統預設的UncaughtException處理類 private Thread.UncaughtExceptionHandler mDefaultHandler; //CrashHandler例項 private static CrashHandler INSTANCE = new CrashHandler(); //程式的Context物件 private Context mContext; //用來儲存裝置資訊和異常資訊 private Map<String, String> infos = new HashMap<String, String>(); //用於格式化日期,作為日誌檔名的一部分 private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss"); /** 保證只有一個CrashHandler例項 */ public CrashHandler() { } /** 獲取CrashHandler例項 ,單例模式 */ public static CrashHandler getInstance() { return INSTANCE; } /** * 初始化 * * @param context */ public void init(Context context) { mContext = context; //獲取系統預設的UncaughtException處理器 mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler(); //設定該CrashHandler為程式的預設處理器 Thread.setDefaultUncaughtExceptionHandler(this); } /** * 當UncaughtException發生時會轉入該函式來處理 */ @Override public void uncaughtException(Thread thread, Throwable ex) { if (!handleException(ex) && mDefaultHandler != null) { //如果使用者沒有處理則讓系統預設的異常處理器來處理 mDefaultHandler.uncaughtException(thread, ex); } else { try { Thread.sleep(3000); } catch (InterruptedException e) { Log.e(TAG, "error : ", e); } //退出程式 android.os.Process.killProcess(android.os.Process.myPid()); System.exit(1); } } /** * 自定義錯誤處理,收集錯誤資訊 傳送錯誤報告等操作均在此完成. * * @param ex * @return true:如果處理了該異常資訊;否則返回false. */ private boolean handleException(Throwable ex) { if (ex == null) { return false; } //使用Toast來顯示異常資訊 new Thread() { @Override public void run() { Looper.prepare(); //Toast.makeText(mContext, "...程式.出錯了...", Toast.LENGTH_SHORT).show(); Looper.loop(); } }.start(); //收集裝置引數資訊 collectDeviceInfo(mContext); //儲存日誌檔案 saveCrashInfo2File(ex); return true; } /** * 收集裝置引數資訊 * @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); } } } /** * 儲存錯誤資訊到檔案中 * * @param ex * @return 返回檔名稱,便於將檔案傳送到伺服器 */ 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()+ "/crash/"; File dir = new File(path); if (!dir.exists()) { dir.mkdirs(); }else{ deleteExpireFiles(path); } File logFile=new File(path + fileName); if(!logFile.exists()){ logFile.createNewFile(); } FileOutputStream fos = new FileOutputStream(logFile); fos.write(sb.toString().getBytes()); fos.close(); } return fileName; } catch (Exception e) { Log.e(TAG, "an error occured while writing file...", e); } return null; } public static void deleteExpireFiles(String dirName) { File dir = new File(dirName); if(dir.isDirectory()){ File[] files = dir.listFiles(); for (int i = 0 ; i<files.length ; i++){ if(i < 5 && files.length > 5){ Log.i(TAG,"file is delete "+files[i].getName() + " result : "+files[i].delete()); } } } } public static void reportError(Context context, String error){ } //或 public static void reportError(Context context, Throwable e){ } }
在Application初始化時直接呼叫
CrashHandler crashHandler = CrashHandler.getInstance();
crashHandler.init(getApplicationContext());