android - MediaPlayer 播放时 ProgressBar 被阻塞

Question

我正在尝试使 MediaPlayer 循环播放，因此它在播放时准备和设置进度时不确定。

我尝试了很多方法，但这是我的最后一个:我在 AsyncTask<Object, Object, Object> 上更新栏.

我使用的类是 CircularProgressView 但我试着换成ProgressBar并且行为是相同:

public void startPlaying(final Audio audio, final CircularProgressView progress_view) {

    if (!isPLAYING) {
        progress_view.setIndeterminate(true);
        progress_view.setVisibility(View.VISIBLE);
        progress_view.startAnimation();
        isPLAYING = true;
        audioPlaying = audio;
        mp = new MediaPlayer();

        new AsyncTask<Object, Object, Object>() {
            @Override
            protected Object doInBackground(Object... objects) {
                try {
                    mp.prepare();
                    publishProgress((int)-1);

                    mediaFileLengthInMilliseconds = mp.getDuration();
                    mp.start();

                    while (mp != null && mp.isPlaying()) {
                        Thread.sleep(100);
                        publishProgress((int) (mp.getCurrentPosition()));
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                try {
                    mp.setDataSource(audio.getFile().getUrl());
                } catch (IOException e) {
                    e.printStackTrace();
                }
                mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mediaPlayer) {
                        stopPlaying();
                        publishProgress((int)-2);
                    }
                });
            }

            @Override
            protected void onProgressUpdate(Object... values) {
                super.onProgressUpdate(values);
                int value = (int)values[0];
                if (value == -1) {
                    progress_view.setIndeterminate(false);
                    progress_view.setMaxProgress(mediaFileLengthInMilliseconds);
                } else if (value == -2) {
                    progress_view.setVisibility(View.GONE);
                } else {
                    progress_view.setProgress((int) values[0]);
                    System.out.println("setting: " + values[0]);
                }
            }

            @Override
            protected void onPostExecute(Object o) {
                super.onPostExecute(o);
            }
        }.execute();

    } else {
        isPLAYING = false;
        stopPlaying();
    }
}

调试时，ProgressBar或 CircularProgressView .setProgress()在音频再现期间被调用，但它在 indeterminate 中仍然被阻止，但是progress_view.setIndeterminate(false)也被调用，并且它不会变得不确定。

当音频结束时，ProgressBar或 CircularProgressView获得 100% 的进度。

有什么线索吗？

非常感谢您。

---

编辑:

正如@Blackbelt 所建议的，我不得不调用 mediaFileLengthInMilliseconds = mp.getDuration();之前publishProgress((int)-1);

但现在这是行为:

https://drive.google.com/file/d/0B-V0KHNRjbE_b3hkbkwtTXhIeTg/view?usp=sharing

---

编辑 2:mp.getDuration() 的日志和 mp.getCurrentPosition() :

http://pastebin.com/g93V5X9F

或者这可能更清楚:

http://pastebin.com/kYm01Gpg

调用这部分:

            @Override
            protected void onProgressUpdate(Object... values) {
                super.onProgressUpdate(values);
                int value = (int)values[0];
                if (value == -1) {
                    progress_view.setIndeterminate(false);
                    progress_view.setMaxProgress(mediaFileLengthInMilliseconds);
                    Log.i("Stackoverflow:", "setMaxProgress to " + mediaFileLengthInMilliseconds);
                } else if (value == -2) {
                    progress_view.setVisibility(View.GONE);
                } else {
                    progress_view.setProgress((int) values[0]);
                    Log.i("Stackoverflow:", "setProgress to " + (int)values[0]);

                }
            }

---

编辑 3:我正在添加新代码，注释掉函数 setIndeterminate(boolean)并换成 ProgressBar :

XML:

<ProgressBar
        android:id="@+id/progress_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:indeterminate="false"
        android:progress="40"
        android:visibility="gone"
        android:layout_alignTop="@+id/play_button"
        android:layout_alignLeft="@+id/play_button"
        android:layout_alignStart="@+id/play_button"
        android:layout_alignRight="@+id/play_button"
        android:layout_alignEnd="@+id/play_button"
        android:layout_alignBottom="@+id/play_button" />

Java:

public void startPlaying(final Audio audio, final ProgressBar progress_view) {

    if (!isPLAYING) {
        Log.i("Stackoverflow", "startPlaying called");
        audio.put("times_listened", audio.getTimes_Listened() + 1);
        audio.saveEventually();

        progress_view.setVisibility(View.VISIBLE);
        isPLAYING = true;
        audioPlaying = audio;
        mp = new MediaPlayer();

        new AsyncTask<Object, Object, Object>() {
            @Override
            protected Object doInBackground(Object... objects) {
                try {
                    mp.prepare();
                    mediaFileLengthInMilliseconds = mp.getDuration();
                    publishProgress((int)-1);


                    mp.start();

                    while (mp != null && mp.isPlaying()) {
                        Thread.sleep(100);
                        publishProgress((int) (mp.getCurrentPosition()));
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

                return null;
            }

            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                try {
                    mp.setDataSource(audio.getFile().getUrl());
                } catch (IOException e) {
                    e.printStackTrace();
                }
                mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mediaPlayer) {
                        stopPlaying();
                        publishProgress((int)-2);
                    }
                });
            }

            @Override
            protected void onProgressUpdate(Object... values) {
                super.onProgressUpdate(values);
                int value = (int)values[0];
                if (value == -1) {
                    progress_view.setMax(mediaFileLengthInMilliseconds);
                    Log.i("Stackoverflow:", "setMaxProgress to " + mediaFileLengthInMilliseconds);
                } else if (value == -2) {
                    progress_view.setVisibility(View.GONE);
                } else {
                    progress_view.setProgress((int) values[0]);
                    Log.i("Stackoverflow:", "setProgress to " + (int)values[0]);

                    System.out.println("setting: " + values[0]);
                }
            }

            @Override
            protected void onPostExecute(Object o) {
                super.onPostExecute(o);
            }
        }.execute();

    } else {
        isPLAYING = false;
        stopPlaying();
    }
}

---

编辑 4:

我调用 progress_view.isDeterminate()它正在返回我true每次。所以我决定在修改进度的时候做:

 @Override
            protected void onProgressUpdate(Object... values) {
                super.onProgressUpdate(values);
                int value = (int)values[0];
                if (value == -1) {
                    progress_view.setMax(mediaFileLengthInMilliseconds);
                    Log.i("Stackoverflow:", "setMaxProgress to " + mediaFileLengthInMilliseconds);
                } else if (value == -2) {
                    progress_view.setVisibility(View.GONE);
                } else {
                    if (progress_view.isIndeterminate()) // LOOK AT THIS
                        progress_view.setIndeterminate(false);
                    progress_view.setProgress((int) values[0]);
                    Log.i("Stackoverflow:", "setProgress to " + (int) values[0]);
                    Log.i("Stackoverflow", "Indeterminate state: " + progress_view.isIndeterminate());

                    System.out.println("setting: " + values[0]);
                }
            }

输出总是:

Indeterminate state: true

*为什么？ * :'(

Answer 1

可能您想在调用 publishProgress((int)-1); 之前调用 mediaFileLengthInMilliseconds = mp.getDuration(); 而不是之后，或者不使用该成员总之，因为您已经将 MediaPlayer 保留为成员，所以您可以直接查询它。

编辑

要解决视频中的问题，您必须使用以下样式 style="@android:style/Widget.ProgressBar.Horizo​​ntal。使用圆形 ProgressBar , setIndetermiate 标志被忽略