Android 开发：带有文本的自定义单选按钮？

Question

我为我的 Android 应用程序创建了一个自定义 RadioButton，它只是用自定义图像替换了标准单选按钮。现在我想让通常出现在标准按钮右侧的文本标签与中心的自定义按钮重叠。

有办法做到这一点吗？

更新：这是我尝试创建一个自定义组件来执行此操作：

public class RadioButtonText extends RadioButton {
    Paint myPaint = new Paint();

    public RadioButtonText(Context context) {
        super(context);
    }

    public RadioButtonText(Context context, AttributeSet attrbs) {
        super(context, attrbs);
    }

    @Override
    protected void onDraw (Canvas canvas) {
        super.onDraw(canvas);
        String myText = (String) getText();
        canvas.drawText(myText, 10, 10, myPaint);
    }       
}

这是我在layout.xml中使用它：

<view
    class="com.stickfigs.blockball.BlockBallLevelSelect$RadioButtonText"
    android:button="@drawable/bb_button"
    android:id="@+id/levelButton0"
    android:layout_height="96px"
    android:layout_width="96px"
    android:textColor="#fff"
    android:text="1">
</view>

但是当我尝试运行该应用程序时，我收到此错误：

06-11 22:16:32.642: ERROR/AndroidRuntime(323): Caused by: android.view.InflateException: Binary XML file line #16: Error inflating class com.stickfigs.blockball.BlockBallLevelSelect$RadioButtonText
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.createView(LayoutInflater.java:503)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.app.Activity.setContentView(Activity.java:1647)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at com.stickfigs.blockball.BlockBallLevelSelect.onCreate(BlockBallLevelSelect.java:30)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     ... 11 more
06-11 22:16:32.642: ERROR/AndroidRuntime(323): Caused by: java.lang.NoSuchMethodException: RadioButtonText(Context,AttributeSet)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at java.lang.Class.getMatchingConstructor(Class.java:660)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at java.lang.Class.getConstructor(Class.java:477)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     at android.view.LayoutInflater.createView(LayoutInflater.java:475)
06-11 22:16:32.642: ERROR/AndroidRuntime(323):     ... 23 more
06-11 22:16:32.662: WARN/ActivityManager(42):   Force finishing activity com.stickfigs.blockball/.BlockBallLevelSelect
06-11 22:16:33.198: WARN/ActivityManager(42): Activity pause timeout for HistoryRecord{43edc648 com.stickfigs.blockball/.BlockBallLevelSelect}

我做错了什么？

Answer 1

radioButton 是 TextView 的子类，图像只是左侧可绘制，因此删除左侧可绘制并使用底部可绘制可能更容易。其余的样式与任何文本视图一样，因此适用drawablePadding、paddings 和margin。

<RadioButton
            android:id="@+id/level"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:drawableLeft="@null"
            android:drawableBottom="@android:drawable/btn_radio"  
            android:text="1" />

Answer 2

RadioButtonText 是BlockBallLevelSelect 的内部类。如果没有现有的外部类对象，则无法实例化它的实例。因此，您需要将 RadioButtonText 标记为 static 以引用 XML 中的类型。

附带说明一下，由于它将是静态的，因此将其保留为内部类不再有意义。