Question

我是编程新手，在过去的几个小时里一直试图解决这个问题。我知道这是愚蠢的事。我试图让每个按钮发出声音。任何帮助是极大的赞赏。（增加"import android.view.View.OnClickListener;"，把我的问题变成了绿色，直到我用＃34;＆＃34;然后＃34;然后将进口变为灰色。）

public class PocketParent extends ActionBarActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final MediaPlayer stopMP = MediaPlayer.create(this, R.raw.btmg);
        final MediaPlayer dropMP = MediaPlayer.create(this, R.raw.knock);
        final MediaPlayer popMP = MediaPlayer.create(this, R.raw.oldsoulwr);
        final MediaPlayer noMP = MediaPlayer.create(this, R.raw.smpr);
        final MediaPlayer yeahMP = MediaPlayer.create(this, R.raw.upbeaty);

        ImageButton playstop = (ImageButton) this.findViewById(R.id.imageButton);
        ImageButton playdrop = (ImageButton) this.findViewById(R.id.imageButton2);
        ImageButton playpop = (ImageButton) this.findViewById(R.id.imageButton3);
        ImageButton playno = (ImageButton) this.findViewById(R.id.imageButton4);
        ImageButton playyeah = (ImageButton) this.findViewById(R.id.imageButton5);

        // (HERE IS WHERE MY PROBLEM LIES)
        // *OnClickListener is abstract, cannot be instantiated.*
        // (IT ALSO SAYS IT'S EXPECTING A "," OR " ' " RIGHT BEFORE "new",
        // but that doesn't work either.)

        playstop.setOnClickListener(new View.OnClickListener()
        playdrop.setOnClickListener(new View.OnClickListener()
        playpop.setOnClickListener(new View.OnClickListener()
        playno.setOnClickListener(new View.OnClickListener()
        playyeah.setOnClickListener(new View.OnClickListener()      {
            @Override
            public void onClick(View v) {
                stopMP.start();
                dropMP.start();
                popMP.start();
                noMP.start();
                yeahMP.start();
            }
        });
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        }
         ....
    }
}

Answer 1

你不能这样做：

playstop.setOnClickListener(new View.OnClickListener()
playdrop.setOnClickListener(new View.OnClickListener()
playpop.setOnClickListener(new View.OnClickListener()
....

因为这意味着在java中，你传递给playstop方法很多参数没有逗号分割，

执行

语法更有意义

playstop.setOnClickListener(new View.OnClickListener());
playdrop.setOnClickListener(new View.OnClickListener());
playpop.setOnClickListener(new View.OnClickListener());
....

但您无法做到这一点，因为View.OnClickListener是界面创建View.OnClickListener的对象只是没有意义......

你需要匿名实现所有按钮上的界面，就像你使用playYeah按钮一样

playyeah.setOnClickListener(new View.OnClickListener()      {
        @Override
        public void onClick(View v) {
            .... 
        }
        });
 playstop.setOnClickListener(new View.OnClickListener()      {
        @Override
        public void onClick(View v) {
            .... 
        }
        });
 playdrop.setOnClickListener(new View.OnClickListener()      {
        @Override
        public void onClick(View v) {
            .... 
        }
        });
 Etc etc

Answer 2

尝试更改

ImageButton playstop = (ImageButton) this.findViewById(R.id.imageButton);
ImageButton playdrop = (ImageButton) this.findViewById(R.id.imageButton2);
ImageButton playpop = (ImageButton) this.findViewById(R.id.imageButton3);
ImageButton playno = (ImageButton) this.findViewById(R.id.imageButton4);
ImageButton playyeah = (ImageButton) this.findViewById(R.id.imageButton5);

到

ImageButton playstop = (ImageButton) findViewById(R.id.imageButton);
ImageButton playdrop = (ImageButton) findViewById(R.id.imageButton2);
ImageButton playpop = (ImageButton) findViewById(R.id.imageButton3);
ImageButton playno = (ImageButton) findViewById(R.id.imageButton4);
ImageButton playyeah = (ImageButton) findViewById(R.id.imageButton5);

希望它能帮到你!!

OnClickListener是抽象的，无法实例化

2 个答案: