Android photo color change

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity"     android:orientation="vertical">    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        />    <SeekBar         android:id="@+id/sb1"        android:max="255"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />     <SeekBar         android:id="@+id/sb2"         android:max="255"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />      <SeekBar         android:id="@+id/sb3"         android:max="255"        android:layout_width="match_parent"        android:layout_height="wrap_content"        />             <SeekBar         android:id="@+id/sb4"         android:max="255"        android:layout_width="match_parent"        android:layout_height="wrap_content"        /></LinearLayout>

see the MainActivity.java:

package com.example.photocolorchange;import android.os.Bundle;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.ColorFilter;import android.graphics.ColorMatrix;import android.graphics.ColorMatrixColorFilter;import android.graphics.Matrix;import android.graphics.Paint;import android.view.Menu;import android.widget.ImageView;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;public class MainActivity extends Activity {private ImageView iv1;private SeekBar sb1,sb2,sb3,sb4;private Bitmap alertBitmap;private Canvas canvas;private Paint paint;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iv1 = (ImageView)findViewById(R.id.iv);final Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.shuishou); alertBitmap = Bitmap.createBitmap(bitmap1.getWidth(),bitmap1.getHeight(),bitmap1.getConfig()); paint = new Paint(); canvas = new Canvas(alertBitmap);final Matrix matrix = new Matrix();final ColorMatrix cm = new ColorMatrix();paint.setColorFilter(new ColorMatrixColorFilter(cm));paint.setAntiAlias(true);canvas.drawBitmap(bitmap1, matrix, paint);iv1.setImageBitmap(alertBitmap);sb1 = (SeekBar) findViewById(R.id.sb1);sb2 = (SeekBar) findViewById(R.id.sb2);sb3 = (SeekBar) findViewById(R.id.sb3);sb4 = (SeekBar) findViewById(R.id.sb4);//REDsb1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();cm.set(new float[]{progress/128.0f,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,});paint.setColorFilter(new ColorMatrixColorFilter(cm));canvas.drawBitmap(bitmap1, matrix, paint);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}});//GREENsb2.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();cm.set(new float[]{1,0,0,0,0,0,progress/128.0f,0,0,0,0,0,1,0,0,0,0,0,1,0,});paint.setColorFilter(new ColorMatrixColorFilter(cm));canvas.drawBitmap(bitmap1, matrix, paint);iv1.setImageBitmap(alertBitmap);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}});//BLUEsb3.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();cm.set(new float[]{1,0,0,0,0,0,1,0,0,0,0,0,progress/128.0f,0,0,0,0,0,1,0,});paint.setColorFilter(new ColorMatrixColorFilter(cm));canvas.drawBitmap(bitmap1, matrix, paint);iv1.setImageBitmap(alertBitmap);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}});//sensitometrysb4.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {int progress = seekBar.getProgress();cm.set(new float[]{progress/128.0f,0,0,0,0,0,progress/128.0f,0,0,0,0,0,progress/128.0f,0,0,0,0,0,1,0,});//cm.setSaturation(progress/128.0f);  //saturabilitypaint.setColorFilter(new ColorMatrixColorFilter(cm));canvas.drawBitmap(bitmap1, matrix, paint);iv1.setImageBitmap(alertBitmap);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

final result: