OnCheckedChangeListener问题

Question

package com.example.to;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity implements OnCheckedChangeListener{
    /**
     * 初始化
     * */
    private ImageView ima;
    private ToggleButton tb;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        tb = (ToggleButton) findViewById(R.id.toggleButton);
        ima = (ImageView) findViewById(R.id.imageView;

        tb.setOnCheckedChangeListener(this);
    }
    @Override
    public void OnCheckedChanged(CompoundButton buttonView, boolean isChecked){
        ima.setBackground(isChecked?R.drawable.OFF:R.drawable.ON);
    }


}

OnCheckedChangeListener

OnCheckedChangeListener

有问题，一直报错。

Answer 1

应该是没有导包import android.widget.CompoundButton.OnCheckedChangeListener;

Answer 2

implements CompoundButton.OnCheckedChangeListener这样写试试

Answer 3

错误如上图