Question

我已设法通过XML代码

创建自定义按钮背景形状

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="true" >
        <shape android:shape="rectangle"  >
            <corners android:radius="24dp" />
            <stroke android:width="2dp" android:color="@color/colorWhite" />
            <solid android:color="@color/colorPrimary" />
        </shape>
    </item>
    <item android:state_focused="true">
        <shape android:shape="rectangle"  >
            <corners android:radius="24dp" />
            <stroke android:width="2dp" android:color="@color/colorWhite" />
            <solid android:color="@color/colorPrimary" />
        </shape>
    </item>
    <item >
        <shape android:shape="rectangle"  >
            <corners android:radius="24dp" />
            <stroke android:width="2dp" android:color="@color/colorWhite" />
            <solid android:color="@color/colorWhite" />
        </shape>
    </item>
</selector>

但我想知道Java代码是什么等同于什么？请问任何指南？

Answer 1

在Java中使用它会更加冗长，但这是您需要做的事情。

创建new StateListDrawable()
对于每个州：
- 创建new ShapeDrawable(new RoundRectShape(...))。我不记得构造函数arg是如何工作的，但你可以进行实验。
- 使用shapeDrawable.getPaint()获取其Paint对象并进行修改。您可能会使用setColor()，setStyle()和setStrokeWidth()。
- 构建状态集。这是一个由各种android状态属性组成的整数数组，如android.R.attr.state_pressed，用于你想要的状态。
- 致电stateListDrawable.addState(stateSet, shapeDrawable)。您可以使用StateSet.NOTHING（或空int []）作为默认状态。确保按照它们在XML中显示的顺序添加它们。

这样的事情：

StateListDrawable stateListDrawable = new StateListDrawable();
Shape roundRect = new RoundRectShape(...);
// Add states in order. I'll just demonstrate one.
ShapeDrawable pressed = new ShapeDrawable(roundRect);
Paint paint = pressed.getPaint();
paint.setColor(Color.BLUE);
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(10f); // this is in pixels, you'll have to convert to dp yourself
int[] pressedState = { android.R.attr.state_pressed };
stateListDrawable.addState(pressedState, pressed);

Answer 2

你可以像这样处理按钮状态：

StateListDrawable states = new StateListDrawable();
    states.addState(new int[] { android.R.attr.state_pressed }, getSelectedBackground());
    states.addState(new int[] { android.R.attr.state_focused }, getSelectedBackground());
    states.addState(new int[] {}, getNormalBackground());
    button.setBackgroundDrawable(states);

private ShapeDrawable getNormalBackground() {

    int r = 10;
    float[] outerR = new float[] { r, r, r, r, r, r, r, r };
    RoundRectShape rr = new RoundRectShape(outerR, null, null);
    ShapeDrawable drawable = new ShapeDrawable(rr);
    drawable.getPaint().setColor(Color.GRAY);

    return drawable;

}

private ShapeDrawable getSelectedBackground() {

    float[] outerR2 = new float[] { 10, 10, 10, 10, 10, 10, 10, 10 };
    RectF inset2 = new RectF(3, 3, 3, 3);
    float[] innerR2 = new float[] { 9, 9, 0, 0, 0, 5, 0, 0 };
    ShapeDrawable sh2 = new ShapeDrawable(new RoundRectShape(outerR2, inset2, innerR2));
    return sh2;

}

请参阅此示例以供参考：

{{1}}

检查一次Defining Drawable Shape with in JAVA code

按钮的自定义背景形状通过代码

2 个答案: