在AndroidStudio中播放声音的按钮不播放-ButtonthatPlaysSoundinAndroidStudionotPlaying

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The first parameter of MediaPlayer.create is a Context. The usage of MediaPlayer.create(this, R.raw.shotgun) works when you are working in your Activitys scope, because Activity extends Context, therefore this in this case ends up being a Context as well.

MediaPlayer.create的第一个参数是Context。当您在Activitys范围内工作时，MediaPlayer.create（this，R.raw.shotgun）的使用起作用，因为Activity扩展了Context，因此在这种情况下，这也最终成为Context。

However, you're working within View.OnClickListener scope, and this assumes this class' value, and not Context as required. To fix that, just set the Context variable to this while still in your Activity scope.

但是，您正在View.OnClickListener范围内工作，并且这假设此类的值，而不是需要的Context。要解决这个问题，只需将Context变量设置为此值，同时仍在Activity范围内。

public class MainActivity extends AppCompatActivity {

private Button button;
Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    cOntext= this;

    Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            MediaPlayer mp = MediaPlayer.create(context, R.raw.shotgun);
            mp.start();
        }
    });