步步为营_Android开发课[24]_用户界面之Checkbox(复选框)

Focus on technology, enjoy life！—— QQ：804212028

浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305

• 主题：用户界面之Checkbox(复选框)

  -

  Checkbox复选框（实例）：

  activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical">  

  <CheckBox
    android:id="@+id/beijing"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="北京"
    />
  <CheckBox
    android:id="@+id/shanghai"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="上海"
    />
  <CheckBox
    android:id="@+id/shenzhen"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="深圳"
    />
  <TextView
    android:id="@+id/txt"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
</LinearLayout>  

MainActivity.java:

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    CheckBox beijing=null;
    CheckBox shanghai=null;
    CheckBox shenzhen=null;
    TextView txt =null;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        beijing=(CheckBox)findViewById(R.id.beijing);
        shanghai=(CheckBox)findViewById(R.id.shanghai);
        shenzhen=(CheckBox)findViewById(R.id.shenzhen);
        txt=(TextView)findViewById(R.id.txt);
        //CompoundButton是一个带有选中/未选中状态的按钮，当按钮按下或点中时自动改变状态。
        beijing.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked){
                    txt.setText(buttonView.getText()+"选中");

                }else{
                    txt.setText(buttonView.getText()+"未选中");
                }
            }
        });

        shanghai.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked){
                    txt.setText(buttonView.getText()+"选中");
                }else{
                    txt.setText(buttonView.getText()+"未选中");
                }
            }
        }); 

        shenzhen.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked){
                    txt.setText(buttonView.getText()+"选中");
                }else{
                    txt.setText(buttonView.getText()+"未选中");
                }
            }
        });
    }
}  

运行结果：

Focus on technology, enjoy life！—— QQ：804212028

浏览链接：http://blog.csdn.net/y18334702058/article/details/44624305