在流程的中间应用程序在android中关闭？

Question

我有一项从网络下载数据的活动。如果我不止一次开始下载过程，则在下载过程中应用程序将关闭。我正在使用 AsyncTask 下载数据并使用 Runnable 来完成这些步骤。这是我的代码。我必须在任务完成时删除处理程序的回调吗？如果我将删除回调放在暂停或销毁方法中，它会给出强制关闭错误。

mBackgroundHandler = new Handler();
mRunnable = new Runnable()
{
    public void run()
    {
        mCounterProgress = KamaApplication.getStep();
        Log.v(TAG, "Progress: " + mCounterProgress);
        mRefreshProgress.setProgress(mCounterProgress);
        mRefreshProgress.invalidate();

        if(KamaApplication.getTotalStep() == 100 && KamaApplication.getStep() == 99)
        {
            mStop = true;
        }

        if(!mStop)
        {
            mBackgroundHandler.postDelayed(this, 1000);
        }
    }
};
mBackgroundHandler.postDelayed(mRunnable, 1000);

这是我的异步任务

private class DownloadFilesTask extends AsyncTask<Void, Integer, Void> 
{
    protected Void doInBackground(Void... params) 
    {
        try 
        {
            StepsGeneratorInputJsonData stepsGeneratorInputJsonData = new StepsGeneratorInputJsonData();
            stepsGeneratorInputJsonData.provider = "Android";
            stepsGeneratorInputJsonData.identification = "Vogue";
            stepsGeneratorInputJsonData.password = "abcd";
            mResult = createAndExecuteStepsGenerator(stepsGeneratorInputJsonData);
            JSONObject mNewJSONObject = new JSONObject(mResult);
            String mEndDate = mNewJSONObject.getString("endDate");
            if(mEndDate.equals("null"))
            {
                mRefreshSuccess = false;
            }
            else
            {
                mRefreshSuccess = true;
            }

        } 
        catch (Exception eException) 
        {
            Log.v(TAG, "HotTestGettingError: " + eException.toString());
            mRefreshSuccess = false;
        }
        return null;
   }
   protected void onProgressUpdate(Integer... progress) 
   { }
   protected void onPostExecute(Void result) 
   {
        if(mRefreshSuccess)
        {
            insertData();
        }
        else
        {
            Message mMessage = new  Message();
            mMessage.what = 0;
            mHandler.sendMessage(mMessage);
        }
        mBackgroundHandler.removeCallbacks(mRunnable);
        updateDisplay();
    }
}

我看到了 logcat 并得到了这个：

06-25 12:08:28.007: INFO/WindowManager(128): WIN DEATH: Window{408fc1d8 com.mygosoftware.kama/com.mygosoftware.kama.Usage paused=false}
06-25 12:08:28.011: INFO/ActivityManager(128): Process com.mygosoftware.kama (pid 17691) has died.
06-25 12:08:28.078: INFO/ActivityManager(128): Start proc com.sec.android.app.twlauncher for activity com.sec.android.app.twlauncher/.Launcher: pid=17817 uid=10015 gids={3003, 1015, 3002}
06-25 12:08:28.078: INFO/ActivityManager(128): Low Memory: No more background processes.
06-25 12:08:28.148: INFO/Zygote(17817): Zygote: pid 17817 has CALL PRIVILEGED permission, then set capability for CAP_SYS_ADMIN (21)
06-25 12:08:28.312: INFO/ActivityThread(17817): Pub com.sec.android.app.twlauncher.settings: com.sec.android.app.twlauncher.LauncherProvider
06-25 12:08:28.445: INFO/Launcher(17817): onCreate():  product model family:S1 product model : GT-I9000

06-24 16:47:38.269: ERROR/InputDispatcher(128): channel '40823250 com.mygosoftware.kama/com.mygosoftware.kama.Usage (server)' ~ Consumer closed input channel or an error occurred.  events=0x8
06-24 16:47:38.269: ERROR/InputDispatcher(128): channel '40823250 com.mygosoftware.kama/com.mygosoftware.kama.Usage (server)' ~ Channel is unrecoverably broken and will be disposed!
06-24 16:47:38.304: INFO/ActivityManager(128): Process com.mygosoftware.kama (pid 7637) has died.

我已放入 AndroidManifest 文件

<activity android:name=".Usage" android:screenOrientation="portrait"
        android:clearTaskOnLaunch="true">

还有设置

 intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

并且还放 我活动中的onPause() 方法。

此外，我已经提到了这个链接Activity restarts on Force Close。我的问题非常相似。我已经完成了他们在回答中写的所有内容，但仍然出现错误。

我应该怎么做才能消除这个错误？

谢谢。

Answer 1

private void startDownload() {
        String url = GlobalVariable.Getstr();
        new DownloadFileAsync().execute(url);

    }
class DownloadFileAsync extends AsyncTask<String, String, String> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            showDialog(DIALOG_DOWNLOAD_PROGRESS);
        }

        @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DIALOG_DOWNLOAD_PROGRESS:
            mProgressDialog = new ProgressDialog(this);

//          mProgressDialog.setIcon(R.drawable.icon);
            mProgressDialog.setIcon(R.drawable.tab_icon_pitchforkfm);
            mProgressDialog.setTitle("Downloading file... "
                    + fileName.toString());

            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            mProgressDialog.setCancelable(true);
            mProgressDialog.show();
            return mProgressDialog;
        default:
            return null;
        }
    }   

    @Override
        protected String doInBackground(String... arg0) {

            int len1 = 0;
            int count;
            try {
                URL url = new URL(GlobalVariable.Getstr());
                HttpURLConnection c = (HttpURLConnection) url.openConnection();
                c.setRequestMethod("GET");
                c.setDoOutput(true);
                c.connect();
                int lenghtOfFile = c.getContentLength();
                Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
                String PATH = Environment.getExternalStorageDirectory()
                        + "/download/";
                Log.v(LOG_TAG, "PATH: " + PATH);
                File file = new File(PATH);
                file.mkdirs();

                 String fileName = "workTest.mp3";


                File outputFile = new File(file, fileName);

                FileOutputStream fos = new FileOutputStream(outputFile);

                InputStream is = c.getInputStream();

                byte[] buffer = new byte[1024];
                long total = 0;

                while ((count = is.read(buffer)) != -1) {
                    total += count;
                    publishProgress("" + (int) ((total * 100) / lenghtOfFile));
                    // fos.write(buffer, 0, len1);
                    fos.write(buffer, 0, count);
                }
                fos.close();
                is.close();

            } catch (IOException e) {
                Log.d(LOG_TAG, "Error: " + e);
            }
            return null;
        }

        protected void onProgressUpdate(String... progress) {
            Log.d("ANDRO_ASYNC", progress[0]);

            mProgressDialog.setProgress(Integer.parseInt(progress[0]));
        }
        protected void onPostExecute(String unused) {
            dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
            //refreshList();
            Toast.makeText(
                    FindFilesByType.this,
                    "Downloading of " + fileName
                            + " complete.", Toast.LENGTH_LONG).show();
            try{
            refreshList();
            } catch (Exception e) {
                Toast.makeText(FindFilesByType.this, "ERROR " + e.toString(),
                        Toast.LENGTH_LONG).show();
            }

以上是我的全部代码..此代码正在从 URL 下载指定的 mp3 文件..并将其保存到 SDCARD..并根据下载完成向我显示进度条..希望这对您有用..仍然得到 和问题让我知道快乐编码:):) Pragna