2

这是三角形的 xml：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:id="@+id/shape_id">
        <rotate
            android:fromDegrees="45"
            android:toDegrees="45"
            android:pivotX="-40%"
            android:pivotY="87%" >
            <shape android:shape="rectangle" >
                <stroke android:width="10dp"/>
            </shape>
        </rotate>
    </item>
</layer-list>

这是一个文本视图的背景

<TextView
    android:id="@+id/headlineSelect_TXT2"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_weight="1"
    android:background="@drawable/category_triangle_shape1"
    android:visibility="invisible" />

我想以编程方式更改形状的颜色。我试过这个，但我得到空指针异常

LayerDrawable bgDrawable = (LayerDrawable) getActivity()
    .getResources()
    .getDrawable(R.drawable.category_triangle_shape1);
final GradientDrawable shape = (GradientDrawable) bgDrawable
    .findDrawableByLayerId(R.id.shape_id);
shape.setStroke(10,Color.GREEN);

我怎样才能做到这一点？感谢帮助。

4

3 回答 3

15

这有点棘手，涉及很多演员表：

TextView view = (TextView) findViewById( R.id.my_text_view );

// Get the drawable from the view, if you're using an imageview src
// element you'll go with view.getDrawable()
LayerDrawable layers = (LayerDrawable) view.getBackground();

// Now get your shape by selecting the id
RotateDrawable rotate = (RotateDrawable) layers.findDrawableByLayerId( R.id.shape_id );

// Finally you can access the underlying shape
GradientDrawable drawable = (GradientDrawable) rotate.getDrawable();

// ... and do you fancy things
drawable.setColor( ... );
于 2014-08-04T12:25:30.100 回答
0

忘记 XML 并通过如下代码来完成：

   TextView txtView = (TextView)findViewById(R.id. headlineSelect_TXT2);
    ShapeDrawable.ShaderFactory sf = new ShapeDrawable.ShaderFactory() {
        @Override
        public Shader resize(int width, int height) {
            LinearGradient lg = new LinearGradient(0, 0, 0, txtView.getHeight(),
                new int[] { 
                    Color.LIGHT_GREEN, 
                    Color.WHITE, 
                    Color.MID_GREEN, 
                    Color.DARK_GREEN },  
                new float[] {
                    0, 0.45f, 0.55f, 1 },
                Shader.TileMode.REPEAT);
             return lg;
        }
    };
    PaintDrawable p = new PaintDrawable();
    p.setShape(new RectShape());
    p.setShaderFactory(sf);
    txtView.setBackgroundDrawable((Drawable)p);
于 2014-02-25T00:04:32.300 回答
0

如果您在 res/drawable 内的 xml 文件中有 RotateDrawable，那么您可以尝试以下代码来更改旋转可绘制对象的颜色。

LayerDrawable layers = (LayerDrawable) getResources().getDrawable(R.drawable.triangle);
RotateDrawable rotateShape = (RotateDrawable) (layers.findDrawableByLayerId(R.id.user_color));
GradientDrawable shape = (GradientDrawable) rotateShape.getDrawable();
shape.setColor(Color.parseColor("#FF0000"));
TextView NotchTV = (TextView) view.findViewById(R.id.bubble_notch);
NotchTV.setBackgroundDrawable(layers);

`

于 2016-01-21T06:50:32.510 回答