android - Android:更改背景颜色后，声音应用崩溃

Question

我有以下问题。我有3个用于更改背景颜色的按钮(分别为蓝色，红色和绿色)，还有5个单选按钮，单击它们将播放声音。背景颜色更改按钮和声音单选按钮都可以完全独立地正常工作。将它们放到一个屏幕上后，一旦选择背景颜色更改按钮之一，应用程序就会崩溃。问题出在RadioButton行，特别是在这里:
RadioButton rb = (RadioButton) v;
我不知道该如何处理该错误。有人可以帮我吗？

这是onClick方法中的代码:

               public void onClick(View v) {


            RelativeLayout rl = (RelativeLayout) findViewById(R.id.RelativeLayout1);

               switch (v.getId()) 
               {
               case R.id.button1:
                   Toast.makeText(getBaseContext(), "You switched the color to red!" , Toast.LENGTH_SHORT ).show();
                   rl.setBackgroundColor(Color.RED);

               break;
               case R.id.button2:
                   Toast.makeText(getBaseContext(), "You switched the color to green!" , Toast.LENGTH_SHORT ).show();
                   rl.setBackgroundColor(Color.GREEN);
               break;
               case R.id.button3:
                   Toast.makeText(getBaseContext(), "You switched the color to blue" , Toast.LENGTH_SHORT ).show();
                   rl.setBackgroundColor(Color.BLUE);
               break;
               case R.id.cancel:
                   Toast.makeText(getBaseContext(), "This application will be closed!" , Toast.LENGTH_SHORT ).show();
                   finish();
               break;
               }


               //Perform action on clicks
                 RadioButton rb = (RadioButton) v;  

                 //get the user sound settings
                 AudioManager audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);

                 //get current volume
                 float actualVolume = (float) audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);

                 //get maximum volume
                 float maxVolume = (float) audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);

                 float volume = actualVolume / maxVolume;

             //is the sound loaded already?
                 if(loaded) {
                     //play the sound
                     if (rb.getText().toString().equals("Clong!"))
                         gameAudio.play(soundIDs[0], volume, volume, 1, 0, 1f);
                     else if (rb.getText().toString().equals("Hammering!"))
                         gameAudio.play(soundIDs[1], volume, volume, 1, 0, 1f);
                     else if (rb.getText().toString().equals("Chainsaw Attack!"))
                         gameAudio.play(soundIDs[2], volume, volume, 1, 0, 1f);
                     else if (rb.getText().toString().equals("Smoke alarm!"))
                         gameAudio.play(soundIDs[3], volume, volume, 1, 0, 1f);
                     else if (rb.getText().toString().equals("Sharp the knife!"))
                         gameAudio.play(soundIDs[4], volume, volume, 1, 0, 1f);
                 }

           }

Answer 1

听起来您的onClick()会因按下按钮而被触发...在这种情况下，View v并不是RadioButton而是按钮。

在这种情况下，您的logcat(应始终包括在此处)将显示ClassCastException。

将第二部分包装(处理声音)

if( v instanceof RadioButton ) {
    ... your code here
}

你应该没事的