android - 在 Android 上进行音频开始/停止切换

Question

我到处寻找关于 Android 开发的音乐。我看过API，但我不明白。这是我的代码：

 Button b = (Button) findViewById(R.id.button1);
 b.setOnClickListener(new OnClickListener() {
       @Override
       public void onClick(View v) {
            MediaPlayer mp = MediaPlayer.create(Main.this, R.raw.track1);
        mp.start();
       }           
});

我怎样才能改变它，以便当我再次按下同一个按钮时它会停止它？

Answer 1

package com.my.testing;

import android.R;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class TestAndActivity extends Activity {

    public MediaPlayer mp = null;

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

        Button b = (Button) findViewById(R.id.button1);
        b.setOnClickListener(new OnClickListener() {

                @Override
            public void onClick(View v) {
                if (mp == null) {
                    mp = MediaPlayer.create(TestAndActivity.this, R.raw.track1);
                    mp.start();
                } else {
                    mp.stop();
                    mp = null;
                }
            }

        });
    }
}

Answer 2

为了好玩，您可以在布局中的同一位置定义两个相同的按钮并制作这样的技巧......

     <ImageView
    android:id="@+id/media_player12"
    android:layout_width="40dp"
    android:layout_height="40dp"
    android:layout_alignParentLeft="true"
 android:layout_alignParentTop="true"
    android:src="@drawable/media_player" />    
<ImageView
 android:id="@+id/mute12"
 android:layout_width="40dp"
    android:layout_height="40dp"
 android:layout_alignParentLeft="true"
 android:layout_alignParentTop="true"
 android:visibility="gone"
 android:clickable="false"
 android:src="@drawable/mute" /> 

和代码...

    final ImageView s_on12 = (ImageView) findViewById(R.id.media_player12);
    s_on12.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            mp.release();
            MediaPlayer mp = MediaPlayer.create(Main.this, R.raw.track1);
    mp.start();
            final ImageView s_off12 = (ImageView) findViewById(R.id.mute12);
            s_on12.setVisibility(View.GONE);
            s_on12.setClickable(false);
            s_off12.setVisibility(1);
            s_off12.setClickable(true);
            s_off12.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    mp.stop();

                    s_on12.setVisibility(1);
                    s_on12.setClickable(true);
                    s_off12.setVisibility(View.GONE);
                    s_off12.setClickable(false);
                }
            });

        }
    });