java - 如何在上一个 Activity 中单击某个按钮时播放音频文件

Question

我正在制作一款语言应用，用于我的学习目的和在 Android 中练习 我想将所有类(class)的音频存储在一个数组中，当我按下例如音频 1 时，每节课都有一个 Activity ，它会弹出一个带有播放器的新 Activity (AudioPopup.java) 但问题是我不想让弹出窗口为每节课播放某些音频 我需要的是识别按下了哪个按钮并打开我创建的 AudioPopup 并播放特定的 mp3

AudioPopup代码

public class AudioPopup extends AppCompatActivity {

    SeekBar seek_bar;
    ImageView play_button, pause_button;
    MediaPlayer player;
    ImageView exitPlayer;
    Handler seekHandler = new Handler();
    private int [] audioFiles;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.audio_popup);

        setFinishOnTouchOutside(false);
        audioFiles = new int [] {R.raw.lesson1-1,R.raw.lesson1-2,R.raw.lesson1-3,R.raw.lesson1-4};


        getInit();
        seekUpdation();

        exitPlayer = (ImageView) findViewById(R.id.audio_exit_1);
        exitPlayer.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                finish();
                player.stop();

            }
        });

    }

    public void getInit() {
        seek_bar = (SeekBar) findViewById(R.id.seekbar_1);
        play_button = (ImageView) findViewById(R.id.audio_play_1);
        pause_button = (ImageView) findViewById(R.id.audio_stop_1);

        play_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                PlayAudio();

            }
        });
        pause_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                player.stop();
                releaseMediaPlayer();
                player = MediaPlayer.create(AudioPopup.this, lesson1-1);
                play_button.setImageResource(R.drawable.ic_play_circle_filled_black_48dp);
            }
        });

        player = MediaPlayer.create(this, R.raw.l01_audiotraining_grammatik_01);
        seek_bar.setMax(player.getDuration());
        seek_bar.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                seekChange(v);
                return false;
            }
        });


    }

    Runnable run = new Runnable() {
        @Override
        public void run() {
            seekUpdate();

        }
    };

public void seekUpdate() {


    seek_bar.setProgress(player.getCurrentPosition());
    seekHandler.postDelayed(run, 1000);



}

//event handler for the progress of seek bar
private void seekChange(View view) {
    if (player.isPlaying()) {
        SeekBar sb = (SeekBar) view;
        player.seekTo(sb.getProgress());

    }

}

private void releaseMediaPlayer() {
    // If the media player is not null, then it may be currently playing a sound.
    if (player != null) {
        // Regardless of the current state of the media player, release its resources
            // because we no longer need it.
            player.release();

            // Set the media player back to null. For our code, we've decided that
            // setting the media player to null is an easy way to tell that the media player
            // is not configured to play an audio file at the moment.
            player = null;
        }
    }

    private void PlayAudio(){

        if (player == null) {
            player = MediaPlayer.create(AudioPopup.this,R.raw.lesson1-1 );
        }

        if (player.isPlaying()) {

            player.pause();
            play_button.setImageResource(R.drawable.ic_play_circle_filled_black_48dp);
            try {
                player.prepare();
            } catch (IllegalStateException e) {

                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        } else {


            play_button.setImageResource(R.drawable.ic_pause_circle_filled_black_48dp);
            player.start();


        }
    }

}

这只播放我插入的音频，它无法识别第一个 Activity 中来自哪个按钮

audio1 = (ImageView) popupView.findViewById(R.id.lesson1_audio_gramar_1);
assert audio1 != null;
audio1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent audio_intent = new Intent(getApplicationContext(), AudioPopup.class);
        startActivity(audio_intent);

    }
});

每节课的每个音频我都有很多按钮要按，实际上是 24 节课:(

Answer 1

您需要做的是通过第一个 Activity 中选定的类(class) 并在第二个中加载播放正确的音频

您可以通过多种方式识别播放哪个按钮(类(class))，

简单的一个是数字 1 , 2 ,3 ... 每个数字代表类(class) 或者您可以传递音频文件的资源 ID，然后在下一个 Activity 中播放 此选项更好，因为您不必在下一个 Activity 中使用 if 语句来了解索引 4 代表哪一课。

我们开始吧

对于 audio1 按钮，传递第 1 课的 res id

audio1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent audio_intent = new Intent(getApplicationContext(), AudioPopup.class);
        audio_intent.putExtra("lesson_res_id", R.raw.lesson1-1);
        startActivity(audio_intent);

    }
});

对于 audio2 按钮，传递第 2 课的 res id

audio2.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent audio_intent = new Intent(getApplicationContext(), AudioPopup.class);
        audio_intent.putExtra("lesson_res_id", R.raw.lesson2-2);
        startActivity(audio_intent);

    }
});

现在在第二个 Activity 中，获取这个传递的值，然后播放音频。

int lessonResId = getIntent().getIntExtra("lesson_res_id", -100); //-100 is default, means the key 'lesson_res_id' was not found in extras bundle
playAudio(lessonResId);

你可以重构代码(如果你有太多的按钮) 通过创建一个启动弹出 Activity 的方法，并从传递音频资源 ID 的 onClick 调用它

private void openPopupActivity(int resId){
    Intent audio_intent = new Intent(getApplicationContext(), AudioPopup.class);
    audio_intent.putExtra("lesson_res_id", resId);
    startActivity(audio_intent);
}

和 onClick 将是

audio2.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        openPopupActivity(R.raw.lesson2-2);
    }
});