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ImageView实现AndroidcolorPikcer选择器的示例代码

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本文介绍了ImageView 实现Android colorPikcer 选择器的示例代码,分享给大家,具体如下:

Android colorPikcer 选择器

环形的ColorPicker,主要思路是:

  1. Color 选在放在ImageView 的background上面,根据点击的位置判断选择的颜色。
  2. 重写onTouch,在onTouch 里面判断点击点的颜色。
  3. 根据当前选择的颜色设置图片的src.

获取Bitmap

在 ColorPickerView 构造函数中初始化 Bitmap。因为getBackground有多种drawable,然后获取Bitmap 的方式也不用,

 void init(Context context, @Nullable AttributeSet attrs, int defStyleAttr){ Drawable drawable = getBackground(); if(drawable instanceof BitmapDrawable){ mBitmap = ((BitmapDrawable) drawable).getBitmap(); } else if(drawable instanceof VectorDrawable){ mBitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); Canvas vectorCanvas = new Canvas(mBitmap); drawable.setBounds(0, 0, vectorCanvas.getWidth(), vectorCanvas.getHeight()); drawable.draw(vectorCanvas); }

重写onTouch

根据Touch 事件的左边获取 Bitmap 对应点的颜色。

需要注意的是如果 View 的宽和高参数是 wrap_content, MotionEvent 的点击的点一定在Bitmap 的坐标内。但是如果不是wrap_content, 需要对坐标转换,利用矩阵Matrix 对点击点转换。

 public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN && mBitmap != null) { float scaleX = mBitmap.getWidth()*1.0f/v.getWidth(); float scaleY = mBitmap.getHeight()*1.0f/v.getHeight(); float[] touchPoint = new float[] { event.getX(), event.getY() }; Matrix matrix = new Matrix(); matrix.setScale(scaleX, scaleY); matrix.mapPoints(touchPoint); mSelectColor = mBitmap.getPixel((int) touchPoint[0], (int) touchPoint[1]); } return false; } 

完整的代码:

 public class ColorPickerView extends android.support.v7.widget.AppCompatImageView implements View.OnTouchListener{ private Bitmap mBitmap; private int mSelectColor = -1; private int mIndex = -1; private int[] mDrawableSelects; private int[] mColorArray; private OnColorSelectedListener mOnColorSelectedListener; public ColorPickerView(Context context) { this(context, null); } public ColorPickerView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public ColorPickerView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context, attrs, defStyleAttr); } void init(Context context, @Nullable AttributeSet attrs, int defStyleAttr){ Drawable drawable = getBackground(); if(drawable instanceof BitmapDrawable){ mBitmap = ((BitmapDrawable) drawable).getBitmap(); } else if(drawable instanceof VectorDrawable){ mBitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888); Canvas vectorCanvas = new Canvas(mBitmap); drawable.setBounds(0, 0, vectorCanvas.getWidth(), vectorCanvas.getHeight()); drawable.draw(vectorCanvas); } TypedArray resTypeArray = context.obtainStyledAttributes(attrs, R.styleable.ColorPickerView); int colorPickerArrayId = resTypeArray.getResourceId(R.styleable.ColorPickerView_cp_selected_drawable_array, 0); resTypeArray.recycle(); if (colorPickerArrayId != 0) { TypedArray typeArray = getResources().obtainTypedArray(colorPickerArrayId); mDrawableSelects = new int[typeArray.length()]; for (int i = 0; i  v.getWidth() || event.getX() <0){ return false; } if(event.getY() > v.getHeight() || event.getY() <0){ return false; } float scaleX = mBitmap.getWidth()*1.0f/v.getWidth(); float scaleY = mBitmap.getHeight()*1.0f/v.getHeight(); float[] touchPoint = new float[] { event.getX(), event.getY() }; Matrix matrix = new Matrix(); matrix.setScale(scaleX, scaleY); matrix.mapPoints(touchPoint); mSelectColor = mBitmap.getPixel((int) touchPoint[0], (int) touchPoint[1]); mIndex = getColorIndex(mSelectColor); if(mDrawableSelects.length > 0 && mIndex >=0 && mIndex  

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

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