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  • Toast--报错

    Toast的makeText()方法报错
    帖上一代码,用Toast来简单处理回调机制.但是Toast的makeText()方法老报错:
    import android.content.Context;
    import android.util.AttributeSet;
    import android.util.Log;
    import android.view.KeyEvent;
    import android.widget.Button;
    import android.widget.Toast;

    public class MyButton  extends  Button {


    public MyButton(Context context, AttributeSet attrs) {
       super(context, attrs);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    super.onKeyDown(keyCode, event);
      //就是这里了

    Toast toast=Toast.makeText(MyButton.this, "the callBack test", 5000);
    toast.show();
    return true;
    }
    }
    报错信息:

    The method makeText(Context, CharSequence, int) in the type Toast is not applicable for the arguments (MyButton, String, int)

    ------解决方案--------------------
    public class MyButton extends Button {

    private Context mContext;

    public MyButton(Context context, AttributeSet attrs) {
    super(context, attrs);
       mContext = context;
    }

    Toast toast=Toast.makeText(mContext, "the callBack test", 5000);
    toast.show(); 
    ------解决方案--------------------
    第一个参数,使用  getContext() 或者 getApplicationContext()
    第三个参数也不正确,应该是   Toast.makeText(getContext(), "the callBack test", Toast.LENGTH_LONG).show();

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  • 原文地址:https://www.cnblogs.com/awkflf11/p/6847844.html
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