Android异常捕捉并写入文本
应用场景
开发的软件应用在实际的场景中不可避免的出现各种问题,但是开发人员不能在现场实时调试,远程不能在现该场景,以至于
无法解决该问题,最好的解决方法是集成腾讯的移动分析,可以实时的监控用户的每一步操作,出现问题的地方,但是若是软件
应用在内网环境下这种方法是没有效果的,因此可采用捕捉异常并将其写入文本,调试时可依据此文本调试
代码
/**
* 继承UncaughtExceptionHandler 所有未处理的异常都由此类处理
*/
public class CrashHandler implements Thread.UncaughtExceptionHandler {
private Context context;
public static final String TAG = "CrashHandler";
private Thread.UncaughtExceptionHandler mDefaultHandler;
private static CrashHandler crashHandler;
private Map<String, String> infos = new HashMap<>();
private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
/**
* 保证只有一个CrashHandler实例
*/
private CrashHandler() {
}
/**
* 单例模式 获取CrashHandler实例
* @return
*/
public static CrashHandler getInstance() {
if (crashHandler == null) {
crashHandler = new CrashHandler();
}
return crashHandler;
}
/**
* 此方法必须在Application中调用初始化
*/
public void init(Context context) {
this.context = context;
mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
Thread.setDefaultUncaughtExceptionHandler(this);
}
/**
* 当UncaughtException发生时会转入该函数来处理
*/
@Override
public void uncaughtException(Thread thread, Throwable throwable) {
if (!handleException(throwable) && mDefaultHandler != null) {
mDefaultHandler.uncaughtException(thread, throwable);
} else {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
Log.e(TAG, "error : ", e);
}
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;
}
Log.d("异常:", ex.getMessage());
new Thread() {
@Override
public void run() {
Looper.prepare();
Toast.makeText(context, "很抱歉,程序出现异常,即将退出,可在crash文件夹中查看错误日志",
Toast.LENGTH_LONG).show();
Looper.loop();
}
}.start();
collectDeviceInfo(context);
saveCrashInfoFile(ex);
return true;
}
/**
* 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 saveCrashInfoFile(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 + ".txt";
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
String path = Environment.getExternalStorageDirectory().toString()+"/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;
}
/**
* 收集设备参数信息
* @param ctx
*/
private 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 (PackageManager.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);
}
}
}
备注
此方法是参考一个项目,此项目来源不确定,无法给出原作链接,特此说明