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：
