Question

这是一个简单的应用程序，可以通过右/左糖果切换图像

布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageSwitcher
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageSwitcher"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dp"
        android:background="@drawable/s"
        />
</RelativeLayout>

onCreate中的定义：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sw = (ImageSwitcher) findViewById(R.id.imageSwitcher);

        sw.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView myView = new ImageView(getApplicationContext());
                myView.setImageResource(R.drawable.s);
                myView.setOnTouchListener(new View.OnTouchListener() {

                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        GestureManager.onTouch(v , event);
                        return true;
                    }
                });
                myView.setScaleType(ImageView.ScaleType.FIT_CENTER);
                myView.setLayoutParams(new ImageSwitcher.LayoutParams
                        (LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
                return myView;
            }
        });
    }

GestureManager

    static boolean onTouch(View v, MotionEvent event) {

        int pointerId = event.getPointerId(event.getActionIndex());                                             
        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_DOWN:{
                pointerList.clear();
                mPoints.clear();
                mPoints.add(new MyPoint(pointerId , event.getX() , event.getY()));
                break;
            }

            case MotionEvent.ACTION_MOVE: { 
                for (int size = event.getPointerCount(), i = 0; i < size; i++) {
                    mPoints.add(new MyPoint(event.getPointerId(i) , event.getX(i) , event.getY(i)));
                }
                break;
            }
            case MotionEvent.ACTION_UP:
                processGesture(v,true);
                break;
        }
        return true;
    }

    private static void processGesture(View v,boolean singleGes){
        if(pointerList.size()==1){
            String msg = detectSingleGesture(mPoints);
            int size_x=MainActivity.sw.getWidth();
            switch (msg) {
                case "left":
                    TranslateAnimation left_to_right_in = new TranslateAnimation( size_x,0 , 0, 0 );
                    left_to_right_in.setDuration(1000);
                    left_to_right_in.setZAdjustment(AnimationSet.ZORDER_TOP);

                    TranslateAnimation left_to_right_out = new TranslateAnimation( 0,-size_x, 0, 0 );
                    left_to_right_out.setDuration(1000);
                    left_to_right_out.setZAdjustment(AnimationSet.ZORDER_BOTTOM);


                    MainActivity.sw.setInAnimation(left_to_right_in);
                    MainActivity.sw.setOutAnimation(left_to_right_out);
                    index--;
                    break;
                case "right":
                    TranslateAnimation right_left_in = new TranslateAnimation( -size_x,0 , 0, 0 );
                    right_left_in.setDuration(1000);
                    right_left_in.setZAdjustment(AnimationSet.ZORDER_TOP);

                    TranslateAnimation right_left_in_out = new TranslateAnimation( 0,size_x, 0, 0 );
                    right_left_in_out.setDuration(1000);
                    right_left_in_out.setZAdjustment(AnimationSet.ZORDER_BOTTOM);

                    MainActivity.sw.setInAnimation(right_left_in);
                    MainActivity.sw.setOutAnimation(right_left_in_out);
                    index++;
                    break;
            }
            if(index>4) index=0;
            if(index<0) index=4;
//            MainActivity.sw.setImageResource(image_ids[index]);
            Drawable d=new BitmapDrawable(context.getResources(), bmp[index]);
            MainActivity.sw.setImageDrawable(d);

        }
  }

此代码正常工作，通过向左或向右扫描动画运行并将图像转换为新动画

问题：

如何根据手指在屏幕上的移动来修改此代码以使新图像移动，就像android主屏幕一样？

我还应该使用ImageSwitcher，还是有其他的视图更适合这个应用程序？

（我尝试在MotionEvent.ACTION_MOVE中应用动画，但我不确定它是不是一个好的解决方案。）

感谢您的帮助

Answer 1

尝试使用ViewPager

的屏幕幻灯片

ViewPagers有内置的滑动手势来转换页面，它们默认显示屏幕幻灯片动画，因此您不需要创建任何

ImageSwitcher动画就像主屏幕滑动动画一样

1 个答案: