Android image color processing,

Android image color processing,

You can move the mouse to adjust the seekbar and adjust the color of the image.

The project layout is as follows:

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

The effect is as follows:

The logic code is as follows:

Package com. wuyudong. resize; import android. OS. bundle; import android. app. activity; import android. graphics. bitmap; import android. graphics. bitmapFactory; import android. graphics. canvas; import android. graphics. color; 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; private Bitmap alterBitmap; 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); // set the final bitmap bitmap1 = BitmapFactory. decodeResource (getResources (), R. drawable. ic_launcher); // creates a bitmap alterBitmap = Bitmap. createBitmap (bitmap1.getWidth (), bitmap1.getHeight (), bitmap1.getConfig (); // use alterBitmap as the template to create a canvas = new Canvas (alterBitmap ); // create a paint brush and set the property Paint = new paint (); paint. setColor (Color. BLACK); // create a Matrix final matrix Matrix = new Matrix (); // specify the color matrix final ColorMatrix cm = new ColorMatrix ();/*** Set this colormatrix to identity: * [1 0 0 0 0 0-red vector * 0 1 0 0 0-green vector * 0 0 1 0 0-blue vector * 0 0 0 1 0]-alpha vector */ paint. setColorFilter (new ColorMatrixColorFilter (cm); paint. setAntiAlias (true); // sets the canvas. drawBitmap (bitmap1, matrix, paint); iv1.setImageBitmap (alterBitmap); sb1 = (SeekBar) findViewById (R. id. sb1); sb2 = (SeekBar) findViewById (R. id. sb2); sb3 = (SeekBar) findViewById (R. id. sb3); 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, 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); transform (alterBitmap) ;}@ Override public void onStartTrackingTouch (SeekBar seekBar) {}@ Override public void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser) {}}); sb2.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, progress/128.0f, 0, 0, 0, 0, 0, 1, 0,}); paint. setColorFilter (new ColorMatrixColorFilter (cm); canvas. drawBitmap (bitmap1, matrix, paint); transform (alterBitmap) ;}@ Override public void onStartTrackingTouch (SeekBar seekBar) {}@ Override public void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser) {}}); 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, progress/128.0f, 0, 0, 0, 0, 0, 0, 1, 0,}); paint. setColorFilter (new ColorMatrixColorFilter (cm); canvas. drawBitmap (bitmap1, matrix, paint); transform (alterBitmap) ;}@ Override public void onStartTrackingTouch (SeekBar seekBar) {}@ Override public void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser ){}});}}

Running effect: