无法在 Android 应用程序中的 new View.OnFocusChangeListener() 中使用 MediaPlayer.create
好的，我的 Android 应用程序遇到了一个我不明白的问题。在下面的代码中，我在 MediaPlayer mpWeight = MediaPlayer.create(this, R.raw.mppig); 上遇到错误
将光标放在 create 上会显示：
MediaPlayer 类型中的方法 create(Context, int) 不适用于参数 (new View.OnFocusChangeListener(){ }, int)
这是什么意思，更重要的是，我该如何解决它？
这是整个例程：
TextView tv=(TextView)findViewById(R.id.weight);
tv.setOnFocusChangeListener(new OnFocusChangeListener(){
@Override
public void onFocusChange(View v,boolean hasFocus){
/* When focus is lost check that the text field
* has valid values.
*/
if (!hasFocus) {
float tempweight = Float.parseFloat(et_weight.getText().toString());
if(tempweight > 200){
MediaPlayer mpWeight = MediaPlayer.create(this, R.raw.mppig);
mpWeight.start();
}
}
}
});
OK, I'm having an issue that I don't understand in my Android app. In the code below, I'm getting an error on the MediaPlayer mpWeight = MediaPlayer.create(this, R.raw.mppig);
Holding my cursor over create says:
The method create(Context, int) in the type MediaPlayer is not applicable for the arguments (new View.OnFocusChangeListener(){}, int)
What does that mean, and more importantly, how do I resolve it?
Here's the whole routine:
TextView tv=(TextView)findViewById(R.id.weight);
tv.setOnFocusChangeListener(new OnFocusChangeListener(){
@Override
public void onFocusChange(View v,boolean hasFocus){
/* When focus is lost check that the text field
* has valid values.
*/
if (!hasFocus) {
float tempweight = Float.parseFloat(et_weight.getText().toString());
if(tempweight > 200){
MediaPlayer mpWeight = MediaPlayer.create(this, R.raw.mppig);
mpWeight.start();
}
}
}
});
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MediaPlayer.create(this, R.raw.mppig);中的this对应于OnFocusChangeListener的实例，但您需要传递应用程序上下文。将创建调用更改为
MediaPlayer.Create(getApplicationContext(), R.raw.mppig);The
thisin yourMediaPlayer.create(this, R.raw.mppig);corresponds to the instance ofOnFocusChangeListenerbut you need to pass the application context.Change your create call to
MediaPlayer.Create(getApplicationContext(), R.raw.mppig);