这篇文章将为大家详细讲解有关Android中怎么对图片的颜色进行处理,文章内容质量较高,因此小编分享给大家做个参考,希望大家阅读完这篇文章后对相关知识有一定的了解。
布局:
<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">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="青--红" />
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/red_seekbar"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="青--绿" />
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/green_seekbar"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="青--蓝" />
<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/blue_seekbar"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/im"
android:src="@drawable/img_small_1"/>
</LinearLayout>
activity:
public class MainActivity extends Activity implements OnSeekBarChangeListener{
private SeekBar red_sb,green_sb,blue_sb;
private ImageView imageView;
private Canvas canvas;
private Paint paint;
private Bitmap baseBitmap,copyBitmap;
private float red_vector,green_vector,blue_vector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
red_sb=(SeekBar) findViewById(R.id.red_seekbar);
green_sb=(SeekBar) findViewById(R.id.green_seekbar);
blue_sb=(SeekBar) findViewById(R.id.blue_seekbar);
imageView=(ImageView) findViewById(R.id.im);
red_sb.setOnSeekBarChangeListener(this);
green_sb.setOnSeekBarChangeListener(this);
blue_sb.setOnSeekBarChangeListener(this);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
int progress=seekBar.getProgress();
float count=progress/50f;//使拖动条的取值为0f-2f,满足我们的取值要求
switch (seekBar.getId()) {
case R.id.red_seekbar:
this.red_vector=count;
break;
case R.id.green_seekbar:
this.green_vector=count;
break;
case R.id.blue_seekbar:
this.blue_vector=count;
break;
default:
break;
}
//主题代码
baseBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.img_small_1);
copyBitmap=Bitmap.createBitmap(baseBitmap.getWidth(), baseBitmap.getHeight(), baseBitmap.getConfig());
canvas=new Canvas(copyBitmap);
Matrix matrix=new Matrix();
paint=new Paint();
//vector:取值范围(0-2)
float[] colors=new float[]{
red_vector,0,0,0,0,
0,green_vector,0,0,0,
0,0,blue_vector,0,0,
0,0,0,1,0};
paint.setColorFilter(new ColorMatrixColorFilter(colors));
canvas.drawBitmap(baseBitmap, matrix, paint);
imageView.setImageBitmap(copyBitmap);
}
}
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