天天看點

Android 代碼改變圖示顔色及動态生成Drawerable Selector

原創文章,如有轉載,請注明出處:http://blog.csdn.net/myth13141314/article/details/64906237

Android 開發中Drawerable的Selector檔案用得很頻繁,有時候圖示檔案隻有預設的,缺少選中狀态或是按下狀态的圖示資源,這個時候就需要用代碼改變圖示的顔色,動态生成Selector檔案

改變圖示的顔色

主要就是改變畫筆的顔色重新繪制

/*
* change image color
* @params context
* @params resId, the image resource need to change color
* @params color, target color, default is white
* 
* @return bitmap
*
* */
public static Bitmap changeImageColor(Context context, int resId, int color) {
        Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resId);

        Bitmap mAlphaBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas mCanvas = new Canvas(mAlphaBitmap);
        Paint mPaint = new Paint();
        if (color != ) {
            mPaint.setColor(color);
        }else {
            mPaint.setColor(Color.parseColor("#FFFFFF"));
        }
        Bitmap alphaBitmap = bitmap.extractAlpha();
        mCanvas.drawBitmap(alphaBitmap, , , mPaint);

        return mAlphaBitmap;
    }
           

将Bitmap轉化為Drawerable

new BitmapDrawable(context.getResources(), bitmap)
           

生成Selector檔案

/*
* 生成selector
* 
* */
public static StateListDrawable initSelector(Context context, int normal) {
    StateListDrawable states = new StateListDrawable();

    //按下狀态
    states.addState(new int[] {android.R.attr.state_pressed},
            new BitmapDrawable(context.getResources(), changeImageColor(context, normal, Color.parseColor("#eb3636"))));

    //選中狀态
    states.addState(new int[] {android.R.attr.state_selected},
            new BitmapDrawable(context.getResources(), changeImageColor(context, normal, Color.parseColor("#eb3636"))));

    if (Build.VERSION.SDK_INT > LOLLIPOP) {
        states.addState(new int[] {}, context.getResources().getDrawable(normal, null));
    }else {
        states.addState(new int[] {}, context.getResources().getDrawable(normal));
    }

    return states;
}
           

應用

imageView.setImageDrawable(initSelector(context, R.mipmap.icon))
           

雖然還是讓設計切圖來得友善,但是掌握一些基本的技巧還是很有必要的

歡迎關注我的公衆号,和我一起每天進步一點點!

Android 代碼改變圖示顔色及動态生成Drawerable Selector