Pepa Zapletal Pepa Zapletal - 6 days ago 8
Android Question

Android: Make a button with triangle shape using xml definitions (drawable)

I want create this using button (TextView) by using XML definiton:

my image

In layout of the Activity I have:

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/button_arrow" <!-- I NEED IMPLEMENT THIS -->
android:clickable="true"
android:drawablePadding="7dp"
android:gravity="center"
android:drawableLeft="@drawable/music_cloud"
android:onClick="exportSong"
android:padding="20dp"
android:text="@string/export_upload"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/dark_yellow_text_color"
android:textStyle="bold" />


I founded several posts:

making-a-triangle-shape-using-xml-definitions

Android triangle (arrow) defined as an XML shape

or Android - make an arrow shape with xml

I tried modify several XML definition but nothing was good. Is there some easy way how to implement this shape? Also it should have a transparent background.

Answer

If someone still has issues with this :

  1. xml:

    <item android:top="45dp">
        <shape>
            <size android:height="100dp" android:width="90dp"/>
            <solid android:color="@android:color/holo_orange_light" />
        </shape>
    </item>
    <item android:top="36dp" android:left="11dp">
        <rotate
            android:fromDegrees="45"
            android:toDegrees="0"
            android:pivotX="80%"
            android:pivotY="20%" >
            <shape>
                <size android:width="40dp"
                    android:height="30dp"/>
                <stroke android:color="@android:color/holo_orange_light" android:width="1dp"/>
                <solid android:color="@android:color/holo_orange_light" />
            </shape>
        </rotate>
    </item>
    </layer-list>
    
  2. override TextView and use it in your layout:

    public class CustomTextView extends TextView {
    
        private int mWidth;
        private int mHeight;
    
    
        public CustomTextView(Context context, AttributeSet attrs)  {
            super(context, attrs);
    
        }
    
        @Override
        protected void onDraw(Canvas canvas) {
    
           super.onDraw(canvas);
            Paint mPaint = new Paint();
            int color = getResources().getColor(R.color.YourColor);
    
            mPaint.setColor(color);
            Path mPath = new Path();
            mPath.moveTo(.0f, this.getHeight());
            mPath.lineTo(0.8f * this.getWidth(), this.getHeight());
            mPath.lineTo(this.getWidth(), 0.5f * this.getHeight());
            mPath.lineTo(0.8f * this.getWidth(), .0f);
            mPath.lineTo(.0f, .0f);
            mPath.lineTo(.0f, this.getHeight());
    
            canvas.clipPath(mPath);
            canvas.drawPath(mPath,mPaint);
    
    
        }
    }
    

Regarding the xml example: there are two rectangles overlapping.You have to play around with the values a lot and this makes it difficult to use on different views. I think using a custom view is the best solution in this case.

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