以编程方式更改小部件的渐变背景

Question

我想要完成的事情：

int[] colors = new int[]{colorDark,colorLight}
GradientDrawable gd = new GradientDrawable(TOP_BOTTOM, colors);
remoteView.setBackgroundDrawable(gd); //method does not exist

显然这是不可能的。

我怎样才能做到这一点？（如果可能的话）

我不想在 xml 文件中为不同的颜色创建多个形状，因为这会限制选项。

我尝试将我的可绘制对象转换为位图并调用setImageViewBitmap。我用this code 转换并使用this code 来获取宽度/高度，但我无法填充小部件（此外，设备的显示宽度/高度真的不是我需要的）

Answer 1

我只是猜测。能否尝试扩展 RemoteViews 并覆盖 apply 函数：

public class MySpecialRemoteViews extends RemoteViews {

    //add the Constructors

    public View apply(Context context, ViewGroup parent) {
        View result = super.apply(context, parent);

        //your code
        int[] colors = new int[]{colorDark,colorLight}
        GradientDrawable gd = new GradientDrawable(TOP_BOTTOM, colors);
        result.setBackgroundDrawable(gd);
        //end of your code

        return result;
    }
}

Answer 2

use following class 

import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Shader;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.StateListDrawable;
import android.graphics.drawable.shapes.RoundRectShape;
import android.view.View;

public class UtilForGradientBackground {

   public static void gradientBgCreatorFromHex(View view, String bgColorHex, String gradColorHex) {

      ColorDefinitionResult bgColor = getArgbFromHexaString(bgColorHex);

      ColorDefinitionResult gradientColor = getArgbFromHexaString("1b6da7");
      CreateGradientBackground(view, bgColor, gradientColor);

   }

   public static void CreateGradientBackground(View view, ColorDefinitionResult bgColor, ColorDefinitionResult gradientColor) {

      int argbBgColor = Color.argb((int) bgColor.Alpha, bgColor.Red, bgColor.Green, bgColor.Blue);
      int argbGradient = Color.argb((int) gradientColor.Alpha, gradientColor.Red, gradientColor.Green, gradientColor.Blue);

      final Shader upperShader = new LinearGradient(0, 0, 0, 40, argbBgColor, argbGradient, Shader.TileMode.CLAMP);

      float[] roundedCorner = new float[] { 0, 0, 0, 0, 0, 0, 0, 0 };

      ShapeDrawable normal = new ShapeDrawable(new RoundRectShape(roundedCorner, null, null));
      normal.getPaint().setShader(upperShader);

      normal.setPadding(7, 3, 7, 0);
      StateListDrawable stateList = new StateListDrawable();
      stateList.addState(new int[] {}, normal);
      view.setBackgroundDrawable(stateList);
   }

   public static ColorDefinitionResult getArgbFromHexaString(String hexColorString) {
      ColorDefinitionResult colorDefinitionResult = new ColorDefinitionResult();
      if (hexColorString.length() == 6) {
         String redHex = hexColorString.substring(0, 2);
         String greenHex = hexColorString.substring(2, 4);
         String blueHex = hexColorString.substring(4, 6);
         colorDefinitionResult.Red = Integer.parseInt(redHex, 16);
         colorDefinitionResult.Green = Integer.parseInt(greenHex, 16);
         colorDefinitionResult.Blue = Integer.parseInt(blueHex, 16);
         colorDefinitionResult.Alpha = 255;

      }
      return colorDefinitionResult;
   }
}


and use it as follow:
give it your View id and RGB values as arguments
      View findViewById = findViewById(R.id.your_view_id);
      UtilForGradientBackground.gradientBgCreatorFromHex(findViewById, "2E64FE", "819FF7");

Answer 3

好久没做RemoteViews了：

您能否添加一个自定义视图，该视图具有采用单个字符串的方法。 然后您可以使用 RemoteViews.setString 调用此方法，此方法可以解析字符串中的数字并将其应用为背景。