按下按钮时声音无法播放？

Question

所以目前我已经实现了这段代码：

最终MediaPlayer mp = new MediaPlayer（）;         按钮b =（按钮）findViewById（R.id.button）;

    b.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            if (mp.isPlaying()) {
                mp.stop();
                mp.reset();
            }
            try {

                AssetFileDescriptor afd;
                afd = getAssets().openFd("pop.mp3");
                mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                mp.prepare();
                mp.start();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    });

完全没有错误。应用程序启动并正常工作，但即使上面的方法已经实现，我也听不到任何声音。

以下是我的其余代码：

public class MyActivity2 extends Activity {
private String[] colors;
private String[] values;
private TextView tv;
private RelativeLayout rl;
Button n;
int index = 0;
int position2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my_activity2);
    n = (Button) findViewById(R.id.button);
    tv = (TextView) findViewById(R.id.textView);
    rl = (RelativeLayout) findViewById(R.id.layout_view);

    Typeface typeface = Typeface.createFromAsset(getAssets(), "BebasNeue Bold.ttf");
    n.setTypeface(typeface);
    Typeface face = Typeface.createFromAsset(getAssets(), "OSP-DIN.ttf");
    tv.setTypeface(face);

    final MediaPlayer mp = new MediaPlayer();
    Button b = (Button) findViewById(R.id.button);

    b.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            if (mp.isPlaying()) {
                mp.stop();
                mp.reset();
            }
            try {

                AssetFileDescriptor afd;
                afd = getAssets().openFd("Facebook Chat 'pop' Sound 3.mp3");
                mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                mp.prepare();
                mp.start();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (Exception e) {

            }

        }
    });
            values = getResources().getStringArray(R.array.allthings_array);
            colors = getResources().getStringArray(R.array.colorcode_array);

            n.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    switch (event.getAction()) {
                        case MotionEvent.ACTION_DOWN:
                            if (index == 5) {
                                Toast.makeText(getApplicationContext(), "More coming soon!", Toast.LENGTH_SHORT).show();
                            } else {
                                position2 = (index++);
                            }
                            String textValue = values[position2];
                            tv.setText(textValue);
                            Random RAND = new Random();
                            int position = RAND.nextInt(colors.length);
                            String nextValue = colors[position];
                            rl.setBackgroundColor(Color.parseColor(nextValue));
                            n.setBackgroundColor(Color.argb(00, 00, 00, 00));
                            return true;
                        case MotionEvent.ACTION_UP:
                            n.setBackgroundColor(Color.argb(00, 00, 00, 00));
                            return true;
                        default:
                            return false;
                    }
                }
            });
        }

        @Override
        public void onBackPressed() {
            super.onBackPressed();
            overridePendingTransition(R.anim.animation4, R.anim.animation3);
        }
    }

Answer 1

首先，我建议您在res文件夹中创建一个名为raw的新文件夹，然后将您的音频文件放在此文件夹中。

然后在onClick方法中编写此代码源：

b.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

           // mp = new MediaPlayer();
            mp = MediaPlayer.create(this, R.raw.pop);
           mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
           mp.setLooping(true);
            mp.start();

        }
    });