最近、私はアニメーションで遊んでいて、同様のことを試みました。これがクラスです。それは基本的に親ビューの周りを跳ね回ります(数学を変更してさらに進むことができます)
package com.example.animationtests.view;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
public class BouncingImageView extends ImageView {
private View mParent;
public BouncingImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public BouncingImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public BouncingImageView(Context context) {
super(context);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
mParent = (View) getParent();
getHandler().post(mRunnable);
}
@Override
protected void onDetachedFromWindow() {
getHandler().removeCallbacks(mRunnable);
super.onDetachedFromWindow();
}
private final Runnable mRunnable = new Runnable() {
private static final int DIRECTION_POSITIVE = 1;
private static final int DIRECTION_NEGATIVE = -1;
private static final int ANIMATION_STEPS = 1;
private int mHorizontalDirection = DIRECTION_POSITIVE;
private int mVerticalDirection = DIRECTION_NEGATIVE;
public boolean mStarted = false;
@Override
public void run() {
if (mParent == null) {
return;
}
final float width = getMeasuredWidth();
final float height = getMeasuredHeight();
final float parentWidth = mParent.getMeasuredWidth();
final float parentHeight = mParent.getMeasuredHeight();
float x = getX();
float y = getY();
if (!mStarted) {
/***
* Randomize initial position
*/
x = (float) Math.random() * (parentWidth - width);
y = (float) Math.random() * (parentHeight - height);
mHorizontalDirection = ((int) x % 2 == 0) ? DIRECTION_NEGATIVE : DIRECTION_POSITIVE;
mVerticalDirection = ((int) y % 2 == 0) ? DIRECTION_NEGATIVE : DIRECTION_POSITIVE;
mStarted = true;
} else {
if (mHorizontalDirection == DIRECTION_NEGATIVE) {
x -= ANIMATION_STEPS;
} else {
x += ANIMATION_STEPS;
}
if (mVerticalDirection == DIRECTION_NEGATIVE) {
y -= ANIMATION_STEPS;
} else {
y += ANIMATION_STEPS;
}
if (x - (width / 3) < 0) {
mHorizontalDirection = DIRECTION_POSITIVE;
} else if (x + (width / 3) > (parentWidth - width)) {
mHorizontalDirection = DIRECTION_NEGATIVE;
}
if (y - (height / 3) < 0) {
mVerticalDirection = DIRECTION_POSITIVE;
} else if (y + (width / 3) > (parentHeight - height)) {
mVerticalDirection = DIRECTION_NEGATIVE;
}
}
setX(x);
setY(y);
getHandler().post(this);
}
};
}
使用法:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".BouncingCircles" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_alignParentBottom="true" >
<com.example.animationtests.view.BouncingImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@drawable/light_dino" />
<com.example.animationtests.view.BouncingImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:src="@drawable/light_dino" />
<com.example.animationtests.view.BouncingImageView
android:layout_width="70dp"
android:layout_height="70dp"
android:src="@drawable/light_dino" />
<com.example.animationtests.view.BouncingImageView
android:layout_width="90dp"
android:layout_height="90dp"
android:src="@drawable/light_dino" />
</RelativeLayout>
</RelativeLayout>