Android革新图像的饱和度、亮度和对比度

发布时间：2021-12-16 13:50:32 所属栏目：教程来源：互联网

导读：使用到了ColorMatrix。 Java代码： package com.figo.imgedit; import java.io.FileNotFoundException; import Android.app.Activity; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.BitmapFactory; imp

使用到了ColorMatrix。

Java代码：

package com.figo.imgedit;

import java.io.FileNotFoundException;

import Android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class ImgeditActivity extends Activity {
    /** Called when the activity is first created. */
    private Bitmap srcBitmap, dstBitmap;
    private String pathName = "/sdcard/testimg.jpg";

    private ImageView dstimage = null;
    private SeekBar SaturationseekBar = null;
    private SeekBar BrightnessseekBar = null;
    private SeekBar ContrastseekBar = null;
    private int imgHeight, imgWidth;

    public static final int PICTURE = 0;
    public static final int MAX_WIDTH = 240;
    public static final int MAX_HEIGHT = 240;
    private Uri imageUri;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        dstimage = (ImageView) findViewById(R.id.dstImageView);
        SaturationseekBar = (SeekBar) findViewById(R.id.Saturationseekbar);
        BrightnessseekBar = (SeekBar) findViewById(R.id.Brightnessseekbar);
        ContrastseekBar = (SeekBar) findViewById(R.id.Contrastseekbar);

        srcBitmap = BitmapFactory.decodeFile(pathName);
        dstimage.setImageBitmap(srcBitmap);
        imgHeight = srcBitmap.getHeight();
        imgWidth = srcBitmap.getWidth();

        dstBitmap = Bitmap.createBitmap(imgWidth, imgHeight, Config.ARGB_8888);

        SaturationseekBar
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
                    // 当拖动条的滑块位置发生改变时触发该方法
                    public void onProgressChanged(SeekBar arg0, int progress,
                            boolean fromUser) {
                        // 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
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,
                                Config.ARGB_8888);
                        ColorMatrix cMatrix = new ColorMatrix();
                        // 设置饱和度
                        cMatrix.setSaturation((float) (progress / 100.0));

                        Paint paint = new Paint();
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));

                        Canvas canvas = new Canvas(bmp);
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);

                        dstimage.setImageBitmap(bmp);

                    }

                    public void onStartTrackingTouch(SeekBar bar) {
                    }

                    public void onStopTrackingTouch(SeekBar bar) {
                    }
                });

        BrightnessseekBar
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
                    // 当拖动条的滑块位置发生改变时触发该方法
                    public void onProgressChanged(SeekBar arg0, int progress,
                            boolean fromUser) {
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,
                                Config.ARGB_8888);
                        int brightness = progress - 127;
                        ColorMatrix cMatrix = new ColorMatrix();
                        cMatrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1,
                                0, 0, brightness,// 改变亮度
                                0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });

                        Paint paint = new Paint();
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));

                        Canvas canvas = new Canvas(bmp);
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);
                        dstimage.setImageBitmap(bmp);

                    }

                    public void onStartTrackingTouch(SeekBar bar) {
                    }

                    public void onStopTrackingTouch(SeekBar bar) {
                    }
                });

        ContrastseekBar
                .setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
                    // 当拖动条的滑块位置发生改变时触发该方法
                    public void onProgressChanged(SeekBar arg0, int progress,
                            boolean fromUser) {
                        Bitmap bmp = Bitmap.createBitmap(imgWidth, imgHeight,
                                Config.ARGB_8888);
                        // int brightness = progress - 127;
                        float contrast = (float) ((progress + 64) / 128.0);
                        ColorMatrix cMatrix = new ColorMatrix();
                        cMatrix.set(new float[] { contrast, 0, 0, 0, 0, 0,
                                contrast, 0, 0, 0,// 改变对比度
                                0, 0, contrast, 0, 0, 0, 0, 0, 1, 0 });

                        Paint paint = new Paint();
                        paint.setColorFilter(new ColorMatrixColorFilter(cMatrix));

                        Canvas canvas = new Canvas(bmp);
                        // 在Canvas上绘制一个已经存在的Bitmap。这样，dstBitmap就和srcBitmap一摸一样了
                        canvas.drawBitmap(srcBitmap, 0, 0, paint);

                        dstimage.setImageBitmap(bmp);
                    }

                    public void onStartTrackingTouch(SeekBar arg0) {
                        // TODO Auto-generated method stub

                    }

                    public void onStopTrackingTouch(SeekBar seekBar) {
                        // TODO Auto-generated method stub
                    }
                });
    }

    /**
     * 需要加载的图片可能是大图，我们需要对其进行合适的缩小处理
     *
     * @param imageUri
     */
    private Bitmap getSrcImage(Uri imageUri) {
        try {
            BitmapFactory.Options ops = new BitmapFactory.Options();
            ops.inJustDecodeBounds = true;
            Bitmap bmp = BitmapFactory.decodeStream(this.getContentResolver()
                    .openInputStream(imageUri), null, ops);
            int wRatio = (int) Math.ceil(ops.outWidth / (float) MAX_WIDTH);
            int hRatio = (int) Math.ceil(ops.outHeight / (float) MAX_HEIGHT);

            if (wRatio > 1 && hRatio > 1) {
                if (wRatio > hRatio) {
                    ops.inSampleSize = wRatio;
                } else {
                    ops.inSampleSize = hRatio;
                }
            }

            ops.inJustDecodeBounds = false;
            bmp = BitmapFactory.decodeStream(this.getContentResolver()
                    .openInputStream(imageUri), null, ops);

            return bmp;

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Log.e(this.getClass().getName(), e.getMessage());
        }

        return null;
    }
}

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