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Android动态改变图片颜色

方法一、通过属性动画来改变图片的颜色

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  if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
ObjectAnimator objectAnimatorTran = ObjectAnimator.ofArgb(mSplashImage, "ColorFilter", getResources().getColor(R.color.colorWhite), getResources().getColor(R.color.colorAccent));
objectAnimatorTran.setDuration(5000);
//objectAnimatorTran.setRepeatCount(-1);
objectAnimatorTran.start();

}
```
# 方法二
## 关键点
获取目标图标的所有像素点
验证像素点的alpha值,是否透明
在不透明的像素点上修改为我们想要的颜色
根据输入的颜色值改变图标颜色

final EditText et = findViewById(R.id.et);
final ImageView iv = findViewById(R.id.iv);
iv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//获取ImageView上的图片
iv.setDrawingCacheEnabled(true);
Bitmap bitmap = iv.getDrawingCache();

    //按照输入的颜色转换图标
    String s = et.getText().toString();
    Bitmap newBitmap = changeBitmapColor(bitmap,s);
    iv.setDrawingCacheEnabled(false);
    iv.setImageBitmap(newBitmap);
}

});

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## 实现方法:

public Bitmap changeBitmapColor(Bitmap sourceBitmap,String aimColorStr){
//验证参数合理
if(sourceBitmap == null || sourceBitmap.isRecycled()){
throw new RuntimeException(“source exception!!!”);
}
int aimColor;
try {
aimColor = Color.parseColor(aimColorStr.trim());
} catch (Exception e){
throw new RuntimeException(“aimColorStr error!!!”);
}
//按照图标的大小创建数组
int mBitmapWidth = sourceBitmap.getWidth();
int mBitmapHeight = sourceBitmap.getHeight();
int mArrayColorLengh = mBitmapWidth * mBitmapHeight;
int[] mArrayColor = new int[mArrayColorLengh];

//循环bitmap 的每个像素点,查看alpha值
int count = 0;
for (int i = 0; i < mBitmapHeight; i++) {
    for (int j = 0; j < mBitmapWidth; j++) {
        //获得Bitmap 图片中每一个点的color颜色值
        int color = sourceBitmap.getPixel(j, i);
        int a = Color.alpha(color);
        if(a != 0){//不等于0 即不透明部分,设置成我们想要的颜色
            mArrayColor[count] = aimColor;
        } else {//透明仍然为透明
            int aimColor2 = Color.parseColor("#00000000");
            mArrayColor[count] = aimColor2;
        }
        count++;
    }
}
//根据数组创建新的Bitmap
Bitmap newBitmap = Bitmap.createBitmap(mBitmapWidth,mBitmapHeight, Bitmap.Config.ARGB_8888);
newBitmap.setPixels(mArrayColor,0,mBitmapWidth,0,0,mBitmapWidth,mBitmapHeight);
return newBitmap;

}

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# 方法三
//提取图像Alpha位图  
        public static Bitmap getAlphaBitmap(Bitmap mBitmap,int mColor) {  
//          BitmapDrawable mBitmapDrawable = (BitmapDrawable) mContext.getResources().getDrawable(R.drawable.enemy_infantry_ninja);  
//          Bitmap mBitmap = mBitmapDrawable.getBitmap();  

            //BitmapDrawable的getIntrinsicWidth()方法,Bitmap的getWidth()方法  
            //注意这两个方法的区别  
            //Bitmap mAlphaBitmap = Bitmap.createBitmap(mBitmapDrawable.getIntrinsicWidth(), mBitmapDrawable.getIntrinsicHeight(), Config.ARGB_8888);  
            Bitmap mAlphaBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), Config.ARGB_8888);  

            Canvas mCanvas = new Canvas(mAlphaBitmap);  
            Paint mPaint = new Paint();  

            mPaint.setColor(mColor);  
            //从原位图中提取只包含alpha的位图  
            Bitmap alphaBitmap = mBitmap.extractAlpha();  
            //在画布上(mAlphaBitmap)绘制alpha位图  
            mCanvas.drawBitmap(alphaBitmap, 0, 0, mPaint);  

            return mAlphaBitmap;  
        }  
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## 实现

ImageView deviceIV.setDrawingCacheEnabled(true);
Bitmap deviceBmp = deviceIV.getDrawingCache();
int color = Color.parseColor(“#00000000”);
Bitmap bitmap = getAlphaBitmap(deviceBmp,color);
deviceIV.setImageBitmap(bitmap);
时常会出现null,原因是超出系统提供最大的DrawingCache值,所以要在此代码前添加如下代码:
deviceIV.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
deviceIV.layout(0, 0, deviceIV.getMeasuredWidth(), deviceIV.getMeasuredHeight());

`