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[英]Android Studio: How to get an ImageView to move in the direction of rotation
[英]Android - How to move ImageView on Swipe
我是新手,為Android應用程序實現Swipe Gesture。 我正在嘗試使用以下代碼從屏幕的左側向右側滑動ImageView:
public class MainActivity extends Activity implements OnClickListener{
private static final int SWIPE_MIN_DISTANCE = 10;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView btnSwipe = (ImageView)findViewById(R.id.imgBtnSwipe);
btnSwipe.setOnClickListener(this);
gestureDetector = new GestureDetector(this, new MyGestureDetector());
gestureListener = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
};
btnSwipe.setOnTouchListener(gestureListener);
}
class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(MainActivity.this, "Left Swipe", Toast.LENGTH_SHORT).show();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(MainActivity.this, "Right Swipe", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// nothing
}
return false;
}
}
@Override
public void onClick(View v) {
}
}
我正在收到Toast消息作為右鍵滑動。 但是形象並沒有動人。 我該如何實現呢? 請幫我提供示例代碼/鏈接。
我找到了一個簡單的解決方案如下:
右側滑動(朝向右側):
btnSwipe.setTranslationX(e2.getX());
左側滑動(向左)
btnSwipe.setTranslation(e1.getX());
現在,ImageView正在從右向左和從左向右水平過渡。 但這適用於Android API
Level 11以上版本。
您需要使用PagerAdapter進行滑動功能。 像這樣的東西:
public class FullScreenImageAdapter extends PagerAdapter {
//Stores all the image paths
private ArrayList<String> _imagePaths;
.........
@Override
public Object instantiateItem(ViewGroup container, int position) {
//This method is called each time user swipes the screen
//Write suitable code to display next image on the screen
}
......
}
這是官方文檔的鏈接。
http://developer.android.com/training/animation/screen-slide.html http://developer.android.com/reference/android/support/v4/view/PagerAdapter.html
這是關於Image Slider的優秀教程的鏈接
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