Android 如何停止在Gallery小部件中滚动？

我把一些图片载入了一个图库。现在我可以滚动了，但一旦开始滚动，滚动就不会停止。我想画廊只是滚动到下一个图像，然后停止，直到用户再次做滚动手势

这是我的代码

import android.widget.ImageView;
import android.widget.Toast;
 import android.widget.AdapterView.OnItemClickListener;

public class GalleryExample extends Activity {

private Gallery gallery;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

     gallery = (Gallery) findViewById(R.id.examplegallery);
     gallery.setAdapter(new AddImgAdp(this));

     gallery.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id) {

            Toast.makeText(GalleryExample.this, "Position=" + position, Toast.LENGTH_SHORT).show();
        }
    });

}

public class AddImgAdp extends BaseAdapter {
    int GalItemBg;
    private Context cont;


    private Integer[] Imgid = {
            R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4, R.drawable.a_5, R.drawable.a_6, R.drawable.a_7
    };

    public AddImgAdp(Context c) {
        cont = c;
        TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
        GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
        typArray.recycle();
    }

    public int getCount() {
        return Imgid.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imgView = new ImageView(cont);

        imgView.setImageResource(Imgid[position]);

        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imgView.setBackgroundResource(GalItemBg);

        return imgView;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/examplegallery"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />
</LinearLayout>

public class CustomGallery extends Gallery {

public CustomGallery(Context context) {
    super(context);
}

public CustomGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
  return e2.getX() > e1.getX();
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
  int kEvent;
  if(isScrollingLeft(e1, e2)){ //Check if scrolling left
    kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
  }
  else{ //Otherwise scrolling right
    kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
  }
  onKeyDown(kEvent, null);
  return true;  
}
}

}

和xmlLayout文件

import android.widget.ImageView;
import android.widget.Toast;
 import android.widget.AdapterView.OnItemClickListener;

public class GalleryExample extends Activity {

private Gallery gallery;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

     gallery = (Gallery) findViewById(R.id.examplegallery);
     gallery.setAdapter(new AddImgAdp(this));

     gallery.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id) {

            Toast.makeText(GalleryExample.this, "Position=" + position, Toast.LENGTH_SHORT).show();
        }
    });

}

public class AddImgAdp extends BaseAdapter {
    int GalItemBg;
    private Context cont;


    private Integer[] Imgid = {
            R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4, R.drawable.a_5, R.drawable.a_6, R.drawable.a_7
    };

    public AddImgAdp(Context c) {
        cont = c;
        TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
        GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
        typArray.recycle();
    }

    public int getCount() {
        return Imgid.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imgView = new ImageView(cont);

        imgView.setImageResource(Imgid[position]);

        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imgView.setBackgroundResource(GalItemBg);

        return imgView;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/examplegallery"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />
</LinearLayout>

public class CustomGallery extends Gallery {

public CustomGallery(Context context) {
    super(context);
}

public CustomGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
  return e2.getX() > e1.getX();
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
  int kEvent;
  if(isScrollingLeft(e1, e2)){ //Check if scrolling left
    kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
  }
  else{ //Otherwise scrolling right
    kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
  }
  onKeyDown(kEvent, null);
  return true;  
}
}

---

我发现实现这一点的最简单方法是重写Gallery onFling方法，并提供我自己的velocityX值：

@Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        return super.onFling(e1, e2, 10, velocityY);
    }

---

这并不完美，但它确实起到了作用。理想情况下，您可能会为onFling编写一些自定义内容，使其完全按照您的喜好工作。

我想我找到了一种方法，既可以在库中一次只滚动一个视图，又可以使用最小的滑动长度来触发动画

覆盖gallery小部件的onFling方法，而不是调用super.onFling，检查刷卡是从左向右还是从右向左，并调用相应的dpad事件，如下所示：

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
  return e2.getX() > e1.getX();
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
  int kEvent;
  if(isScrollingLeft(e1, e2)){ //Check if scrolling left
    kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
  }
  else{ //Otherwise scrolling right
    kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
  }
  onKeyDown(kEvent, null);
  return true;  
}

---

我发现onFling上的以下覆盖对于小刷卡和单页分页来说已经足够好了：

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) 
{
    boolean leftScroll = isScrollingLeft(e1, e2);

    float velX;
    if(leftScroll)
    {
        velX=500;
    }
    else
    {
        velX=-500;
    }

    return super.onFling(e1, e2, velX, velocityY);
}

velX+-500值似乎提供了足够好的结果，但可以根据您的喜好进行调整

---

（注意：这是使用中介绍的

IsCrollingleft

方法）

这是适用于我的代码

Nadewad的解决方案+一些动画速度调整：

创建扩展库的类，并重写此方法：

  @Override
  public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
    setAnimationDuration(600);
    return super.onScroll(e1, e2, distanceX, distanceY);
  }

  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    float velMax = 2500f;
    float velMin = 1000f;
    float velX = Math.abs(velocityX);
    if (velX > velMax) {
      velX = velMax;
    } else if (velX < velMin) {
      velX = velMin;
    }
    velX -= 600;
    int k = 500000;
    int speed = (int) Math.floor(1f / velX * k);
    setAnimationDuration(speed);

    int kEvent;
    if (isScrollingLeft(e1, e2)) {
      // Check if scrolling left
      kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
    } else {
      // Otherwise scrolling right
      kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
    }
    onKeyDown(kEvent, null);

    return true;
  }

@覆盖
公共布尔onScroll（MotionEvent e1、MotionEvent e2、浮点距离X、浮点距离Y）{
设置动画持续时间（600）；
返回super.onScroll（e1，e2，distanceX，distanceY）；
}
@凌驾
公共布尔onFling（MotionEvent e1、MotionEvent e2、float-velocityX、float-velocityY）{
浮子最大值=2500f；
浮动下限=1000f；
float velX=数学绝对值（velocityX）；
如果（velX>velMax）{
velX=velMax；
}否则如果（velX

---

享受吧

简单的方法如下：

@Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        return super.onFling(e1, e2, 0, velocityY);
    }

您也可以在此处查看： 感谢上帝！！！ 天哪，我真的把它插入了一些代码中，它成功了！啊，连续48小时，我只需要在谷歌上搜索我的答案。实际上，即插即用。非常感谢

新代码

import android.widget.ImageView;
import android.widget.Toast;
 import android.widget.AdapterView.OnItemClickListener;

public class GalleryExample extends Activity {

private Gallery gallery;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

     gallery = (Gallery) findViewById(R.id.examplegallery);
     gallery.setAdapter(new AddImgAdp(this));

     gallery.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView parent, View v, int position, long id) {

            Toast.makeText(GalleryExample.this, "Position=" + position, Toast.LENGTH_SHORT).show();
        }
    });

}

public class AddImgAdp extends BaseAdapter {
    int GalItemBg;
    private Context cont;


    private Integer[] Imgid = {
            R.drawable.a_1, R.drawable.a_2, R.drawable.a_3, R.drawable.a_4, R.drawable.a_5, R.drawable.a_6, R.drawable.a_7
    };

    public AddImgAdp(Context c) {
        cont = c;
        TypedArray typArray = obtainStyledAttributes(R.styleable.GalleryTheme);
        GalItemBg = typArray.getResourceId(R.styleable.GalleryTheme_android_galleryItemBackground, 0);
        typArray.recycle();
    }

    public int getCount() {
        return Imgid.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imgView = new ImageView(cont);

        imgView.setImageResource(Imgid[position]);

        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imgView.setBackgroundResource(GalItemBg);

        return imgView;
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android" >
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/examplegallery"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" />
</LinearLayout>

public class CustomGallery extends Gallery {

public CustomGallery(Context context) {
    super(context);
}

public CustomGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
  return e2.getX() > e1.getX();
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
  int kEvent;
  if(isScrollingLeft(e1, e2)){ //Check if scrolling left
    kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
  }
  else{ //Otherwise scrolling right
    kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
  }
  onKeyDown(kEvent, null);
  return true;  
}
}

旧代码：仅供比较之用

 public class CustomGallery extends Gallery {

public CustomGallery(Context context) {
    super(context);
}

public CustomGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
        float distanceY) {
    //Do something specific here.
    return super.onScroll(e1, e2, distanceX, distanceY);
}
}

---

不需要做任何事情，只需返回false即可

private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
  return e2.getX() > e1.getX();
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
  return false;  
}

---

这对我很有效

你应该提供更多关于你的问题的信息以获得答案好吧，我在一个图库中加载了几张图片，当我向右滚动时，它不会停止，我希望每张图片都停止。Janusz我相信你知道如何解决这个问题！：把你的密码贴出来你是一只聪明的狐狸。感谢您提供了这个优雅的解决方案，这正是我需要的，使我的图库可用。这正是我想要的。为了澄清这个解决方案，我无法弄清楚如何内联设置onFling（），只能求助于创建自定义库。这个解决方案最终帮助了我：这对我来说非常有效，除了如果我尝试滚动（而不是抛出）一个图像，比如说左图像到中心，当我到达中心时，左图像到达中心。如何防止这种情况发生？？？对不起，我不太清楚你在问什么。你能说得更具体一点吗？哈，很好，但我们必须寻找这样的解决办法，而不是一个简单的属性，这是多么可怜啊……我很高兴这对你有所帮助。事实上谷歌已经发布了ViewPager类，它实现了同样的目标，但实际上在你滑动手指的时候做了一个中间的滚动动画，而不是在滑动动作完成后滚动。这一个对我来说效果最好，因为它使图库一次只滚动一个，不管你滑动的速度有多快。我已经尝试过KeyEvent解决方案，如果你刷得太快，它会像两到三个一样跳过。