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/
