Android控件——CheckBox

1. 有两种状态：选中状态（true）、未选中状态（false）
2. 属性：
   android:checked=”true”
   android:id=”@+id/checkBox1”
   android:layout_width=”wrap_content”
   android:layout_height=”wrap_content”
   android:layout_alignLeft=”@+id/textView1”
   android:layout_alignTop=”@+id/textView1”
   android:text=”篮球”
3. 实例：

<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.example.checkedbox.MainActivity" >    <CheckBox        android:checked="true"        android:id="@+id/checkBox1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView1"        android:layout_alignTop="@+id/textView1"        android:text="篮球" /></RelativeLayout>

package com.example.checkedbox;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;public class MainActivity extends ActionBarActivity {    private CheckBox checkBox;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //初始化        checkBox=(CheckBox) findViewById(R.id.checkBox1);        //通过设置checkBox的监听事件判断是否被选中        checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener(){            @Override            public void onCheckedChanged(CompoundButton buttonView,                    boolean isChecked) {                Log.i("tag", isChecked+"");                //通过onCheckedChanged来监听当前的checkBox是否被选中                if(isChecked)                {                    //获得checkBox的文本内容                    String text=checkBox.getText().toString();                    Log.i("tag",text);                }            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}