前言
最近在项目开发中有账号关联和切换账号的需求，并且还要有相应的显示和隐藏动画，这时就用到了布局动画 LayoutTransition，LayoutTransition动画是基于ViewGroup的，当你调用View的setVisibility()方法来控制其View的显示或消失时就可以触发该动画，该动画有四中类型：
1.APPEARING — 元素在容器中显现时需要动画显示
2.CHANGE_APPEARING — 由于容器中要显现一个新的元素，其它元素的变化需要动画显示
3.DISAPPEARING —元素在容器中消失时需要动画显示
4.CHANGE_DISAPPEARING — 由于容器中某个元素要消失，其它元素的变化需要动画显示
明白了LayoutTransition的基本使用，我们就可以通过自定义一个ViewGroup来实现该功能
效果图如下：
初始化状态
点击后展开状态
实现
FloatLayout全部代码：
/**
* Created by Mersens on 2016/10/21.
*/
public class FloatLayout extends LinearLayout {
private LayoutParams params = null;
private Context context;
private List list = null;
private static final int ANIMATION_TIME = 20;
private boolean isMenuOpened;
private int i = 0;
private int j = 0;
private ShowRunnable showRunnable = new ShowRunnable();
private HideRunnable hideRunnable = new HideRunnable();
private LayoutTransition layoutTransition;
private LayoutInflater inflater;
private OnItemClickListener onItemClickListener;
public FloatLayout(Context context) {
this(context, null);
}
public FloatLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FloatLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
init();
}
final Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
private void init() {
layoutTransition = new LayoutTransition();
setLayoutTransition(layoutTransition);
list = new ArrayList<>();
inflater = LayoutInflater.from(context);
params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.CENTER;
params.rightMargin = 10;
setGravity(Gravity.RIGHT);
setBackgroundColor(getResources().getColor(android.R.color.transparent));
ObjectAnimator animator1 = ObjectAnimator.ofFloat(null, View.TRANSLATION_X, 0F, 0F).
setDuration(layoutTransition.getDuration(LayoutTransition.APPEARING));
layoutTransition.setAnimator(LayoutTransition.APPEARING, animator1);
ObjectAnimator animator2 = ObjectAnimator.ofFloat(null, View.TRANSLATION_X, 0F, 0F).
setDuration(layoutTransition.getDuration(LayoutTransition.DISAPPEARING));
layoutTransition.setAnimator(LayoutTransition.DISAPPEARING, animator2);
}
public void addMainItem(final ItemBean item) {
View mainView = inflater.inflate(R.layout.list_item, null);
ImageView imageView = (ImageView) mainView.findViewById(R.id.ItemImage);
TextView tv_name = (TextView) mainView.findViewById(R.id.tvname);
Glide.with(context).load(item.getImg()).into(imageView);
tv_name.setText(item.getName());
mainView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (isMenuOpened) {
hidePromotedActions();
isMenuOpened = false;
} else {
isMenuOpened = true;
showPromotedActions();
}
}
});
addView(mainView, params);
}
public void addItem(List items, OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
for (int i = 0; i < items.size(); i++) {
View item = inflater.inflate(R.layout.list_item, null);
ImageView imageView = (ImageView) item.findViewById(R.id.ItemImage);
Glide.with(context).load(items.get(i).getImg()).into(imageView);
TextView tv_name = (TextView) item.findViewById(R.id.tvname);
tv_name.setText(items.get(i).getName());
item.setOnClickListener(new MyOnClicKListener(i));
item.setVisibility(View.GONE);
list.add(item);
addView(item, params);
}
}
private void hidePromotedActions() {
invalidate();
handler.postDelayed(hideRunnable, ANIMATION_TIME);
}
private void showPromotedActions() {
invalidate();
handler.postDelayed(showRunnable, ANIMATION_TIME);
}
class HideRunnable implements Runnable {
@Override
public void run() {
j++;
if (j <= list.size()) {
list.get(j - 1).setVisibility(View.GONE);
handler.postDelayed(hideRunnable, ANIMATION_TIME);
} else {
handler.removeCallbacks(hideRunnable);
j = 0;
}
}
}
class ShowRunnable implements Runnable {
@Override
public void run() {
i++;
if (i <= list.size()) {
list.get(i - 1).setVisibility(View.VISIBLE);
handler.postDelayed(showRunnable, ANIMATION_TIME);
} else {
handler.removeCallbacks(showRunnable);
i = 0;
}
}
}
public class MyOnClicKListener implements OnClickListener {
private int pos;
public MyOnClicKListener(int pos) {
this.pos = pos;
}
@Override
public void onClick(View view) {
onItemClickListener.onItemClick(pos);
}
}
public interface OnItemClickListener {
void onItemClick(int pos);
}
}
list_item.xml文件
这里使用了一个CircleImageView，该View是使用别人的控件，通过自定义ImageView来实现圆形的图片，网上搜索一下会有很多这样的例子，但你也不必这么做，如果你使用了Glide来加载图片的话，Glide本身就可以实现对图片的裁剪，达到圆形展示的效果，不过这里还是打算贴出CircleImageView的代码：
public class CircleImageView extends ImageView {
private static final ScaleType SCALE_TYPE = ScaleType.CENTER_INSIDE;
private static final Bitmap.Config BITMAP_CONFIG = Bitmap.Config.ARGB_8888;
private static final int COLORDRAWABLE_DIMENSION = 1;
private static final int DEFAULT_BORDER_WIDTH = 4;
private static final int DEFAULT_BORDER_COLOR = Color.WHITE;
private final RectF mDrawableRect = new RectF();
private final RectF mBorderRect = new RectF();
private final Matrix mShaderMatrix = new Matrix();
private final Paint mBitmapPaint = new Paint();
private final Paint mBorderPaint = new Paint();
private int mBorderColor = DEFAULT_BORDER_COLOR;
private int mBorderWidth = DEFAULT_BORDER_WIDTH;
private Bitmap mBitmap;
private BitmapShader mBitmapShader;
private int mBitmapWidth;
private int mBitmapHeight;
private float mDrawableRadius;
private float mBorderRadius;
private boolean mReady;
private boolean mSetupPending;
public CircleImageView(Context context) {
super(context);
}
public CircleImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public CircleImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
super.setScaleType(SCALE_TYPE);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleImageView, defStyle, 0);
mBorderWidth = a.getDimensionPixelSize(R.styleable.CircleImageView_border_width, DEFAULT_BORDER_WIDTH);
mBorderColor = a.getColor(R.styleable.CircleImageView_border_color, DEFAULT_BORDER_COLOR);
a.recycle();
mReady = true;
if (mSetupPending) {
setup();
mSetupPending = false;
}
}
@Override
public ScaleType getScaleType() {
return SCALE_TYPE;
}
@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType != SCALE_TYPE) {
throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
}
}
@Override
protected void onDraw(Canvas canvas) {
if (getDrawable() == null) {
return;
}
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mDrawableRadius, mBitmapPaint);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, mBorderPaint);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
setup();
}
public int getBorderColor() {
return mBorderColor;
}
public void setBorderColor(int borderColor) {
if (borderColor == mBorderColor) {
return;
}
mBorderColor = borderColor;
mBorderPaint.setColor(mBorderColor);
invalidate();
}
public int getBorderWidth() {
return mBorderWidth;
}
public void setBorderWidth(int borderWidth) {
if (borderWidth == mBorderWidth) {
return;
}
mBorderWidth = borderWidth;
setup();
}
@Override
public void setImageBitmap(Bitmap bm) {
super.setImageBitmap(bm);
mBitmap = bm;
setup();
}
@Override
public void setImageDrawable(Drawable drawable) {
super.setImageDrawable(drawable);
mBitmap = getBitmapFromDrawable(drawable);
setup();
}
@Override
public void setImageResource(int resId) {
super.setImageResource(resId);
mBitmap = getBitmapFromDrawable(getDrawable());
setup();
}
private Bitmap getBitmapFromDrawable(Drawable drawable) {
if (drawable == null) {
return null;
}
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
try {
Bitmap bitmap;
if (drawable instanceof ColorDrawable) {
bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG);
} else {
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), BITMAP_CONFIG);
}
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
} catch (OutOfMemoryError e) {
return null;
}
}
private void setup() {
if (!mReady) {
mSetupPending = true;
return;
}
if (mBitmap == null) {
return;
}
mBitmapShader = new BitmapShader(mBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
mBitmapPaint.setAntiAlias(true);
mBitmapPaint.setShader(mBitmapShader);
mBorderPaint.setStyle(Paint.Style.STROKE);
mBorderPaint.setAntiAlias(true);
mBorderPaint.setColor(mBorderColor);
mBorderPaint.setStrokeWidth(mBorderWidth);
mBitmapHeight = mBitmap.getHeight();
mBitmapWidth = mBitmap.getWidth();
mBorderRect.set(0, 0, getWidth(), getHeight());
mBorderRadius = Math.min((mBorderRect.height() - mBorderWidth) / 2, (mBorderRect.width() - mBorderWidth) / 2);
mDrawableRect.set(mBorderWidth, mBorderWidth, mBorderRect.width() - mBorderWidth, mBorderRect.height() - mBorderWidth);
mDrawableRadius = Math.min(mDrawableRect.height() / 2, mDrawableRect.width() / 2);
updateShaderMatrix();
invalidate();
}
private void updateShaderMatrix() {
float scale;
float dx = 0;
float dy = 0;
mShaderMatrix.set(null);
if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width() * mBitmapHeight) {
scale = mDrawableRect.height() / (float) mBitmapHeight;
dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f;
} else {
scale = mDrawableRect.width() / (float) mBitmapWidth;
dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f;
}
mShaderMatrix.setScale(scale, scale);
mShaderMatrix.postTranslate((int) (dx + 0.5f) + mBorderWidth, (int) (dy + 0.5f) + mBorderWidth);
mBitmapShader.setLocalMatrix(mShaderMatrix);
}
}
自定义属性attrs.xml文件
ItemBean实体类
/**
* Created by Mersens on 2016/10/22.
*/
public class ItemBean {
private String name;
private String img;
public ItemBean(){
}
public ItemBean(String name, String img) {
this.name = name;
this.img = img;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
添加Glide的依赖
compile 'com.github.bumptech.glide:glide:3.7.0'
具体使用方法
public class MainActivity extends AppCompatActivity {
private FloatLayout floatLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
public void init(){
floatLayout=(FloatLayout)findViewById(R.id.mFloatLayout);
ItemBean mainItem=new ItemBean("小明","http://staging.topmd.cn/UploadFile/image/20160914103216400.jpg");
floatLayout.addMainItem(mainItem);
List list=new ArrayList<>();
list.add(new ItemBean("小王","http://staging.topmd.cn/UploadFile/image/20160923162109048.jpg"));
list.add(new ItemBean("小强","http://staging.topmd.cn/UploadFile/image/20161012160235822.jpg"));
floatLayout.addItem(list, new FloatLayout.OnItemClickListener() {
@Override
public void onItemClick(int pos) {
Toast.makeText(getApplicationContext(), "item"+pos, Toast.LENGTH_SHORT).show();
}
});
}
}