Android多选与单选效果的实现

CheckBox实现多选效果

1.在xml文件中建立CheckBox

    <CheckBox android:id="@+id/cbox"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="bt1"
        android:checked="true"/>

    //可设置多个CheckBox

2.在Activity中初始化操作

public class MainActivity extends Activity {
    private CheckBox cb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        cb = (CheckBox) findViewById(R.id.cbox);

    }

3.通过匿名内部类方式设置监听器

        cb.setOnCheckedChangeListener(new OnCheckedChangeListener(){

            @Override
            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                Log.i("tag", isChecked+" ");//每次ChexkBox被触摸时的操作
                // TODO Auto-generated method stub
                if(isChecked){//此次触摸后，CheckBox处于被按下时的操作
                    String st = cb.getText().toString();
                    Log.i("tag",st);
                }
            }});

二.通过RadioButton和RadioGrop实现单选效果

1.在xml文件中建立RedioGrop

    <RadioGroup
        android:id="@+id/rg1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true" >

        <RadioButton
            android:id="@+id/r1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="RB1" />

        <RadioButton
            android:id="@+id/r2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RB2" />

    </RadioGroup>

2.在Activity 中初始化操作

public class MainActivity extends Activity{
    private RadioGroup rg;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        rg = (RadioGroup) findViewById(R.id.rg1);
        rg.setOnCheckedChangeListener(this);

    }
}

3.通过接口方式设置监听器

public class MainActivity extends Activity implements OnCheckedChangeListener{
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        rg = (RadioGroup) findViewById(R.id.rg1);
        rg.setOnCheckedChangeListener(this);
    }
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub
        switch(checkedId){//判定不同的RadioButton被按下并执行响应操作
        case R.id.r1:
            Log.i("tag","r1");
            break;
        case R.id.r2:
            Log.i("Tag", "r2");
            break;
        }
    }
}