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;
@Override
protected 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);
//RED
sb1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public 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);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
}
});
//GREEN
sb2.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public 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);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
}
});
//BLUE
sb3.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public 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);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
}
});
//sensitometry
sb4.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public 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); //saturability
paint.setColorFilter(new ColorMatrixColorFilter(cm));
canvas.drawBitmap(bitmap1, matrix, paint);
iv1.setImageBitmap(alertBitmap);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
}
});
}
@Override
public 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: