Java 结合两个onTouch事件
对于我的应用程序,我需要结合两个onTouch事件。对于第一个事件,我希望获得imageView中单击像素的颜色,而另一个事件应该使图片可缩放。我试着把它分开,它似乎能自己工作,但当我试着把这两件事结合起来时,它就不再工作了。他们为什么不一起工作 我的代码:Java 结合两个onTouch事件,java,android,Java,Android,对于我的应用程序,我需要结合两个onTouch事件。对于第一个事件,我希望获得imageView中单击像素的颜色,而另一个事件应该使图片可缩放。我试着把它分开,它似乎能自己工作,但当我试着把这两件事结合起来时,它就不再工作了。他们为什么不一起工作 我的代码: public class MainActivity extends AppCompatActivity { private ImageView imageView; private Bitmap bitmap; private Scale
public class MainActivity extends AppCompatActivity {
private ImageView imageView;
private Bitmap bitmap;
private ScaleGestureDetector mScaleGestureDetector;
private float mScaleFactor = 1.0f;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ImageView imageView = (ImageView) findViewById(R.id.imageView);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setDrawingCacheEnabled(true);
imageView.buildDrawingCache(true);
mScaleGestureDetector = new ScaleGestureDetector(this, new ScaleListener());
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleGestureDetector.onTouchEvent(event);
bitmap = imageView.getDrawingCache();
int pixel = bitmap.getPixel((int) event.getX(), (int) event.getY());
String text = "x = " + event.getX() + ", y = " + event.getY();
Log.d("Position", text);
int redValue = Color.red(pixel);
int greenValue = Color.green(pixel);
int blueValue = Color.blue(pixel);
return true;
}
});
}
private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
@Override
public boolean onScale(ScaleGestureDetector scaleGestureDetector){
mScaleFactor *= scaleGestureDetector.getScaleFactor();
mScaleFactor = Math.max(1.0f,
Math.min(mScaleFactor, 1.7f));
imageView.setScaleX(mScaleFactor);
imageView.setScaleY(mScaleFactor);
return true;
}
}
}
我猜这是因为你在这里消费触觉。尝试返回false。这是一个很好的观点,它确实有助于处理错误。我现在不可能在物理设备上测试它,我会尽快做。不幸的是,我的模拟器没有显示任何缩放,但我要看看真正的设备将如何处理它
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleGestureDetector.onTouchEvent(event);
bitmap = imageView.getDrawingCache();
int pixel = bitmap.getPixel((int) event.getX(), (int) event.getY());
String text = "x = " + event.getX() + ", y = " + event.getY();
Log.d("Position", text);
int redValue = Color.red(pixel);
int greenValue = Color.green(pixel);
int blueValue = Color.blue(pixel);
return false;
}
});