3.3复选框

CheckBox复选按钮是一种有双状态按钮的特殊类型，可以选中或者不选中。可以现在布局文件中定义多选按钮，然后对每一个多选按钮进行定义点击事件android:onclick 或者 事件监听setOnCheckedChangeListener，通过isChecked来判断选项是否被选中

1.界面



2.布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.liang.checkboxliang.MainActivity">

<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:text="Sports"
android:textAppearance="?android:attr/textAppearanceLarge" />

<CheckBox
android:id="@+id/cbsoccer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_below="@+id/textView"
android:checked="false"
android:onClick="cbclick"
android:text="soccer" />

<CheckBox
android:id="@+id/cbbasketball"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/cbsoccer"
android:layout_toEndOf="@+id/cbsoccer"
android:checked="false"
android:onClick="cbclick"
android:text="basketball" />

<CheckBox
android:id="@+id/cbtennis"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/cbbasketball"
android:layout_toEndOf="@+id/cbbasketball"
android:checked="false"
android:onClick="cbclick"
android:text="tennis" />
</RelativeLayout>

3.代码

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
private static List<String> list = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
list.clear();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//也可以用监听方法 建议用android:onclick
}

public void cbclick(View view) {
CheckBox cb = (CheckBox) view;
boolean ischecked = cb.isChecked();
String content = cb.getText().toString();
switch (view.getId()) {
case R.id.cbsoccer:
//可以做点保存的工作 StringBuffer或者数据库等等
if (ischecked) {
list.add(content);
} else {
list.remove(content);
}
if (list.size() > 0) {
StringBuffer sb = new StringBuffer("");
for (String s : list) {
sb.append(s + " ");
}
Toast.makeText(MainActivity.this, sb.toString(), Toast.LENGTH_SHORT).show();
}
break;
case R.id.cbbasketball:
if (ischecked) {
list.add(content);
Toast.makeText(MainActivity.this, "basketball checked is true", Toast.LENGTH_SHORT).show();
} else {
list.remove(content);
Toast.makeText(MainActivity.this, "basketball checked is false", Toast.LENGTH_SHORT).show();
}
break;
case R.id.cbtennis:
/*      if (ischecked) {
list.add(content);
} else {
list.remove(content);
}*/
Toast.makeText(MainActivity.this, "tennis checked is " + ischecked, Toast.LENGTH_SHORT).show();
break;
}
}
}