Android 使用CheckBox實現多選效果

CheckBox:複選框
1.有兩種狀態:
 選中狀態(true),未選中狀態(false)
2.屬性:
 android:id="@+id/checkbox"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:checked="false"
 android:text="男"java

CheckBox的默認android:checked屬性爲false。
checkBox的OnCheckedChangeListener事件檢查勾是否勾選。
樣例程序中有3個CheckBox和1個TextView,TextView事實演示了有多少CheckBox被勾選了以及被勾選的CheckBox的名稱。android

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="籃球" />

    <CheckBox
        android:id="@+id/checkBox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="足球" />

    <CheckBox
        android:id="@+id/checkBox3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="乒乓球" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="0項選擇" />

</LinearLayout>
activity_main.xml
package com.example.checkbox;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {
    
    private CheckBox basketballCheckBox;
    private CheckBox footballCheckBox;
    private CheckBox pingpongCheckBox;

    private boolean[] checkedArray = new boolean[] {false, false, false}; 
    
    private TextView textView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        basketballCheckBox = (CheckBox) findViewById(R.id.checkBox1);
        footballCheckBox = (CheckBox) findViewById(R.id.checkBox2);
        pingpongCheckBox = (CheckBox) findViewById(R.id.checkBox3);
        textView = (TextView) findViewById(R.id.textView1);
        
        basketballCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                checkedArray[0] = isChecked;
                textViewResetValue();
            }
        });
        footballCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                checkedArray[1] = isChecked;
                textViewResetValue();
            }
        });
        pingpongCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                checkedArray[2] = isChecked;
                textViewResetValue();
            }
        });
        
    }

    private void textViewResetValue() {
        String values = "";
        int sumChecked = 0;
        for (boolean val : checkedArray)
            if (val == true)
                sumChecked += 1;
        if (sumChecked == 0) 
            textView.setText("0 項選擇");
        else {
            if (checkedArray[0] == true) values += ",籃球";
            if (checkedArray[1] == true) values += ",足球";
            if (checkedArray[2] == true) values += ",乒乓球";
            values = sumChecked + "項選擇:" + values.substring(1);
            textView.setText(values);
        }
    }
}
MainActivity.java

效果:app

注:Android有一個本身的log記錄函數:Log.i()。ide

相關文章
相關標籤/搜索