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ackage com.example.mofangweixin;
 
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.os.Looper;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
 
public class ChangeColorIconWithText extends View {
 
    private int mColor = 0xFF6495ED;
    private Bitmap mIconBitmap;
    private String mText = "微信";
    private int mTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12,
            getResources().getDisplayMetrics());
 
    private Canvas mCanvas;
    private Bitmap mBitmap;
    private Paint mPaint;
 
    private float mAlpha;
 
    private Rect mIconRect;
    private Rect mTextBound;
    private Paint mTextPaint;
 
    public ChangeColorIconWithText(Context context) {
        this(context, null);
    }
 
    public ChangeColorIconWithText(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
 
    /**
     * 获取自定义属性的值
     *
     * @param context
     * @param attrs
     * @param defStyleAttr
     */
    public ChangeColorIconWithText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
 
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ChangeColorIconWithText);
 
        int n = a.getIndexCount();
 
        for (int i = 0; i < n; i++) {
            int attr = a.getIndex(i);
            switch (attr) {
            case R.styleable.ChangeColorIconWithText_icon:
                BitmapDrawable drawable = (BitmapDrawable) a.getDrawable(attr);
                mIconBitmap = drawable.getBitmap();
                break;
            case R.styleable.ChangeColorIconWithText_color:
                mColor = a.getColor(attr, 0xFF191970);
                break;
            case R.styleable.ChangeColorIconWithText_text:
                mText = a.getString(attr);
                break;
            case R.styleable.ChangeColorIconWithText_text_size:
                mTextSize = (int) a.getDimension(attr,
                        TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, getResources().getDisplayMetrics()));
                break;
            }
 
        }
 
        a.recycle();
 
        mTextBound = new Rect();
        mTextPaint = new Paint();
        mTextPaint.setTextSize(mTextSize);
        mTextPaint.setColor(0XFF6495ED);
        mTextPaint.getTextBounds(mText, 0, mText.length(), mTextBound);
 
    }
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int iconWidth = Math.min(getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
                getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - mTextBound.height());
 
        int left = getMeasuredWidth() / 2 - iconWidth / 2;
        int top = getMeasuredHeight() / 2 - (mTextBound.height() + iconWidth) / 2;
        mIconRect = new Rect(left, top, left + iconWidth, top + iconWidth);
    }
 
    @Override
    protected void onDraw(Canvas canvas) {
        canvas.drawBitmap(mIconBitmap, null, mIconRect, null);
 
        int alpha = (int) Math.ceil(255 * mAlpha);
 
        // 内存去准备mBitmap , setAlpha , 纯色 ，xfermode ， 图标
        setupTargetBitmap(alpha);
        // 1、绘制原文本 ； 2、绘制变色的文本
        drawSourceText(canvas, alpha);
        drawTargetText(canvas, alpha);
 
        canvas.drawBitmap(mBitmap, 0, 0, null);
 
    }
 
    /**
     * 绘制变色的文本
     *
     * @param canvas
     * @param alpha
     */
    private void drawTargetText(Canvas canvas, int alpha) {
        mTextPaint.setColor(mColor);
        mTextPaint.setAlpha(alpha);
        int x = getMeasuredWidth() / 2 - mTextBound.width() / 2;
        int y = mIconRect.bottom + mTextBound.height();
        canvas.drawText(mText, x, y, mTextPaint);
 
    }
 
    /**
     * 绘制原文本
     *
     * @param canvas
     * @param alpha
     */
    private void drawSourceText(Canvas canvas, int alpha) {
        //底部字体的颜色
        mTextPaint.setColor(0xFF696969);
        mTextPaint.setAlpha(255 - alpha);
        int x = getMeasuredWidth() / 2 - mTextBound.width() / 2;
        int y = mIconRect.bottom + mTextBound.height();
        canvas.drawText(mText, x, y, mTextPaint);
 
    }
 
    /**
     * 在内存中绘制可变色的Icon
     */
    private void setupTargetBitmap(int alpha) {
        mBitmap = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(), Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
        mPaint = new Paint();
        mPaint.setColor(mColor);
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setAlpha(alpha);
        mCanvas.drawRect(mIconRect, mPaint);
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        mPaint.setAlpha(255);
        mCanvas.drawBitmap(mIconBitmap, null, mIconRect, mPaint);
    }
 
    private static final String INSTANCE_STATUS = "instance_status";
    private static final String STATUS_ALPHA = "status_alpha";
 
    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle bundle = new Bundle();
        bundle.putParcelable(INSTANCE_STATUS, super.onSaveInstanceState());
        bundle.putFloat(STATUS_ALPHA, mAlpha);
        return bundle;
    }
 
    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle bundle = (Bundle) state;
            mAlpha = bundle.getFloat(STATUS_ALPHA);
            super.onRestoreInstanceState(bundle.getParcelable(INSTANCE_STATUS));
            return;
        }
        super.onRestoreInstanceState(state);
    }
 
    public void setIconAlpha(float alpha) {
        this.mAlpha = alpha;
        invalidateView();
    }
 
    /**
     * 重绘
     */
    private void invalidateView() {
        if (Looper.getMainLooper() == Looper.myLooper()) {
            invalidate();
        } else {
            postInvalidate();
        }
    }
 
}