Question

我想要一张背景图片和另一张在背景图片上向下移动的图片，当它到达底部然后停在那里？我怎样才能做到这一点。 “它可以与落叶的街道图像相同”

Answer 1

在底部创建一个布局，并在该布局中添加一个imageview（将图像保留为此图像视图的背景图像）并在布局上应用平移动画。在XML中，布局不可见，并且在代码中使其可见

您应该在您的XML中使用此代码。将此布局设置在底部，并根据需要更改高度，宽度和可见性。记住你的活动shd实现animationListner

       <LinearLayout
 android:id="@+id/linearLayout3"
 android:layout_width="wrap_content"
 android:layout_height="220dip"
 android:orientation="vertical"

 android:layout_marginTop="480dip"

 >
<ImageView android:id="@+id/imageview" 
   android:layout_width ="wrap_content"
   android:layout_height ="wrap_content"
   android:visibility="invisible" 
   android:layout_centerVertical="true"
   android:layout_centerHorizontal="true" 
   android:background="@drawable/stoke1">
</ImageView>
</LinearLayout>

java代码就像这样

         Animation movement5; 
  layout3 = (LinearLayout) findViewById(R.id.linearLayout3);


 movement5 = AnimationUtils.loadAnimation(this,R.layout.animation_test5);
    movement5.reset();
        movement5.setfillafter(true)
    movement5.setAnimationListener(this);
         layout3.startAnimation(movement5);

animation_test5.xml。

       <?xml version="1.0" encoding="utf-8"?>
     <translate xmlns:android="http://schemas.android.com/apk/res/android"
   android:fromXDelta="0%" android:toXDelta="0%" android:fromYDelta="-300%"
  android:toYDelta="100%" android:duration="3000" android:zAdjustment="normal" />

Answer 2

正常界面情况的最简单解决方案是将要移动的内容放入视图中并执行视图动画。具体来说，在视图上创建并启动新的翻译动画。

这是通常用于为屏幕上的界面对象设置动画的技术。

Answer 3

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;

public class MyImageView extends View {

private static final int INVALID_POINTER_ID = -1;

    private Drawable mImage;
    private float mPosX;
    private float mPosY;

    private float mLastTouchX;
    private float mLastTouchY;
    private int mActivePointerId = INVALID_POINTER_ID;

    private ScaleGestureDetector mScaleDetector;
    private float mScaleFactor = 1.f;

    public MyImageView(Context context) {
        this(context, null, 0);
    mImage=act.getResources().getDrawable(context.getResources().getIdentifier("imagename", "drawable", "packagename"));

        mImage.setBounds(0, 0, mImage.getIntrinsicWidth(), mImage.getIntrinsicHeight());
    }

    public MyImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MyImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mScaleDetector = new ScaleGestureDetector(context, new ScaleListener());
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        // Let the ScaleGestureDetector inspect all events.
        mScaleDetector.onTouchEvent(ev);

        final int action = ev.getAction();
        switch (action & MotionEvent.ACTION_MASK) {
        case MotionEvent.ACTION_DOWN: {
            final float x = ev.getX();
            final float y = ev.getY();

            mLastTouchX = x;
            mLastTouchY = y;
            mActivePointerId = ev.getPointerId(0);
            break;
        }

        case MotionEvent.ACTION_MOVE: {
            final int pointerIndex = ev.findPointerIndex(mActivePointerId);
            final float x = ev.getX(pointerIndex);
            final float y = ev.getY(pointerIndex);

            // Only move if the ScaleGestureDetector isn't processing a gesture.
            if (!mScaleDetector.isInProgress()) {
                final float dx = x - mLastTouchX;
                final float dy = y - mLastTouchY;

                mPosX += dx;
                mPosY += dy;

                invalidate();
            }

            mLastTouchX = x;
            mLastTouchY = y;

            break;
        }

        case MotionEvent.ACTION_UP: {
            mActivePointerId = INVALID_POINTER_ID;
            break;
        }

        case MotionEvent.ACTION_CANCEL: {
            mActivePointerId = INVALID_POINTER_ID;
            break;
        }

        case MotionEvent.ACTION_POINTER_UP: {
            final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                    >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
            final int pointerId = ev.getPointerId(pointerIndex);
            if (pointerId == mActivePointerId) {
                // This was our active pointer going up. Choose a new
                // active pointer and adjust accordingly.
                final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
                mLastTouchX = ev.getX(newPointerIndex);
                mLastTouchY = ev.getY(newPointerIndex);
                mActivePointerId = ev.getPointerId(newPointerIndex);
            }
            break;
        }
        }

        return true;
    }

    @Override
    public void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.save();
        Log.d("DEBUG", "X: "+mPosX+" Y: "+mPosY);
        canvas.translate(mPosX, mPosY);
        canvas.scale(mScaleFactor, mScaleFactor);
        mImage.draw(canvas);
        canvas.restore();
    }

    private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
        @Override
        public boolean onScale(ScaleGestureDetector detector) {
            mScaleFactor *= detector.getScaleFactor();

            // Don't let the object get too small or too large.
            mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 10.0f));

            invalidate();
            return true;
        }
    }

}

将代码确定为可以完成您的工作

在屏幕上显示移动的图像

3 个答案: