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;
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);
mSeekBar.setMax(20);
mSeekBar.setProgress(1);
mSeekBar.setProgress(10);
mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
Bitmap bitmap = handleColorMatrixBmp(progress);
mImageView.setImageBitmap(bitmap);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
private Bitmap handleColorMatrixBmp(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 mSaturationMatrix = new ColorMatrix();
mSaturationMatrix.setSaturation(progress);
paint.setColorFilter(new ColorMatrixColorFilter(mSaturationMatrix));// 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;
}
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 mSaturationMatrix = new ColorMatrix();
mSaturationMatrix.setSaturation(progress);
paint.setColorFilter(new ColorMatrixColorFilter(mSaturationMatrix));// 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:
