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  • colorMatrix色彩旋转设置

    package com.loaderman.customviewdemo;
    
    import android.app.Activity;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Canvas;
    import android.graphics.ColorMatrix;
    import android.graphics.ColorMatrixColorFilter;
    import android.graphics.Paint;
    import android.os.Bundle;
    import android.widget.ImageView;
    import android.widget.SeekBar;
    import android.widget.TextView;
    
    public class MainActivity extends Activity {
        private SeekBar mSeekBar;
        private ImageView mImageView;
        private Bitmap mOriginBmp,mTempBmp;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mImageView = (ImageView) findViewById(R.id.img);
            mSeekBar = (SeekBar)findViewById(R.id.seekbar);
            mOriginBmp = BitmapFactory.decodeResource(getResources(), R.drawable.dog);
            mTempBmp = Bitmap.createBitmap(mOriginBmp.getWidth(), mOriginBmp.getHeight(),
                    Bitmap.Config.ARGB_8888);
            TextView tv = (TextView)findViewById(R.id.tv);
            tv.setText("色彩旋转(-180——180):");
    
    
            mSeekBar.setMax(360);
            mSeekBar.setProgress(180);
    
            mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    
                    Bitmap bitmap = handleColorRotateBmp(progress);
                    mImageView.setImageBitmap(bitmap);
                }
    
                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
    
                }
    
                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {
    
                }
            });
    
        }
    
        private Bitmap handleColorRotateBmp(int progress){
    
            // 创建一个相同尺寸的可变的位图区,用于绘制调色后的图片
            Canvas canvas = new Canvas(mTempBmp); // 得到画笔对象
            Paint paint = new Paint(); // 新建paint
            paint.setAntiAlias(true); // 设置抗锯齿,也即是边缘做平滑处理
            ColorMatrix colorMatrix = new ColorMatrix();
    
            colorMatrix.setRotate(0,progress-180);
    
            paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));// 设置颜色变换效果
            canvas.drawBitmap(mOriginBmp, 0, 0, paint); // 将颜色变化后的图片输出到新创建的位图区
            // 返回新的位图,也即调色处理后的图片
            return mTempBmp;
        }
    }

    效果:

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  • 原文地址:https://www.cnblogs.com/loaderman/p/10232391.html
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