import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements 
 
CompoundButton.OnCheckedChangeListener, View.OnClickListener {
    private CheckBox one, two, three, forth;
//存放CheckBox的ID的陣列
private int[] ids = {R.id.ck_one, R.id.ck_two, R.id.ck_three, R.id.ck_forth};
    private List<String> checkBoxData;//存放CheckBox的內容
private List<Boolean> checkBoxStates
 
;//存放CheckBox的狀態
@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//checkBox是多選框
checkBoxData = new ArrayList<>();
checkBoxStates = new ArrayList<>();
        for (int i = 0; i < ids.length; i++) {
            CheckBox checkBox = (CheckBox) findViewById(ids
 
[i]);
checkBox.setOnCheckedChangeListener(this);
checkBoxData.add(checkBox.getText().toString());
checkBoxStates.add(checkBox.isChecked());
}


        findViewById(R.id.btn_main).setOnClickListener(this);
}


    /**
     * isChecked 引數  是用來記錄CheckBox改變之後的狀態的
     */
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        switch (buttonView.getId()) {
            case R.id.ck_one:
                checkBoxStates.set(0, isChecked);
                break;
            case R.id.ck_two:
                checkBoxStates.set(1, isChecked);
                break;
            case R.id.ck_three:
                checkBoxStates.set(2, isChecked);
                break;
            case R.id.ck_forth:
                checkBoxStates.set(3, isChecked);
                break;
}
    }

    @Override
public void onClick(View v) {
        String result = "";
        for (int i = 0; i < checkBoxStates.size(); i++) {
            if (checkBoxStates.get(i)) {
                result += checkBoxData.get(i) + " ";
}
        }
        Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
}