CheckBox的使用和监听

在安卓入门的学习中，遇到了CheckBox，在此记录以便以后阅读。
首先在布局文件中创建CheckBox

然后在activity中添加监听事件
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private LinearLayout mLinear;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLinear = findViewById(R.id.linearlayout);
Button btn_submit = findViewById(R.id.btn_submit);
btn_submit.setOnClickListener(this);
}

@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_submit:
btn_submit_click();
break;
}
}

private void btn_submit_click() {
int checkBoxCount = mLinear.getChildCount();
String hobby = "";
for (int i = 0; i < checkBoxCount; i++) {
CheckBox cb = (CheckBox) mLinear.getChildAt(i);
if (cb.isChecked()) {
hobby = hobby + (String) cb.getText();
}
}
Toast.makeText(this, hobby, Toast.LENGTH_SHORT).show();
}

}

运行效果如图