isChecked()不能工作

Question

我不知道为什么，但是isChecked()不能工作，它说它不能解析符号。我有什么要进口的吗。我也想问一下，你将如何修改Textview中的文本，谢谢！

package xyz.ashraf.whoisdelasalle;

import android.view.View;
import android.widget.CheckBox;

/**
 * Created by Ashraf on 3/2/2016.
 */
public class check_Button extends Pop_sallian{
CheckBox concern = (CheckBox) findViewById(R.id.concern);
CheckBox faith = (CheckBox) findViewById(R.id.faith);
CheckBox respect = (CheckBox) findViewById(R.id.respect);
CheckBox education = (CheckBox) findViewById(R.id.education);
CheckBox community = (CheckBox) findViewById(R.id.community);

int con = 0;
int fai = 0;
int res = 0;
int edu = 0;
int com = 0;

if (concern.isChecked()) {
    con++;
}
if (faith.isChecked()) {
    fai++;
}
if(respect.isChecked()){
    res++;
}
if(education.isChecked()){
    edu++;
}
if(community.isChecked()){
    com++;
}
}

Answer 1

必须首先创建onCreate方法..。然后将代码添加到其中。

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

     CheckBox concern = (CheckBox) findViewById(R.id.concern);
     CheckBox faith = (CheckBox) findViewById(R.id.faith);
     CheckBox respect = (CheckBox) findViewById(R.id.respect);
     CheckBox education = (CheckBox) findViewById(R.id.education);
     CheckBox community = (CheckBox) findViewById(R.id.community);

     int con = 0;
    int fai = 0;
    int res = 0;
    int edu = 0;
    int com = 0;

    if (concern.isChecked()) {
        con++;
    }
    if (faith.isChecked()) {
        fai++;
    }
    if(respect.isChecked()){
        res++;
    }
    if(education.isChecked()){
        edu++;
    }
    if(community.isChecked()){
        com++;
    }


}