仿造美图秀秀移动鼠标调整seekbar，调整图片的颜色

项目布局如下：

<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>

效果如下：

逻辑部分代码如下：

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); // 设置第一个bitmap的图标 final Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); // 新建一个bitmap alterBitmap = Bitmap.createBitmap(bitmap1.getWidth(), bitmap1.getHeight(), bitmap1.getConfig()); // 以alterBitmap为模板新建画布 canvas = new Canvas(alterBitmap); // 新建画笔并设置属性 paint = new Paint(); paint.setColor(Color.BLACK); // 新建矩阵 final Matrix matrix = new Matrix(); // 指定颜色矩阵 final ColorMatrix cm = new ColorMatrix(); /** * Set this colormatrix to identity: * [ 1 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); // 设置画布 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, 1, 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(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, 0, progress/128.0f, 0, 0, 0, 0, 0, 1, 0, }); paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(bitmap1, matrix, paint); iv1.setImageBitmap(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, 0, progress/128.0f, 0, 0, 0, 0, 0, 1, 0, }); paint.setColorFilter(new ColorMatrixColorFilter(cm)); canvas.drawBitmap(bitmap1, matrix, paint); iv1.setImageBitmap(alterBitmap); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { } }); } }

运行效果：

出处：http://www.cnblogs.com/wuyudong/