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本篇文章給大家分享的是有關Android開發中實現一個彈出框的方法，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
截圖：
動畫效果介紹：
1.點擊ActionBar上“+”按鈕，菜單從上方彈出（帶反彈效果）；
2.再次點擊“+”、點擊空白區域或者點擊返回鍵，菜單向上方收起；
3.點擊彈出框上的按鈕時，該按鈕放大，其它按鈕縮小，菜單整體漸變退出。
主體代碼：
1.Activity.
/**
* 仿易信動畫彈出框
*/
public class MainActivity extends ActionBarActivity {
//用于標記頁面頂端位置
private View topView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
topView = findViewById(R.id.main_top);
}
private PopupWindow popupWindow;
private int line1DeltaY, line2DeltaY;
//仿易信更多彈出框
private void showPopup() {
if (popupWindow == null) {
View contentView = LayoutInflater.from(this).inflate(R.layout.yixin_pop_layout, null);
//點擊空白區域關閉
View blankView = contentView.findViewById(R.id.yixin_more_blank);
View blankView2 = contentView.findViewById(R.id.yixin_more_blank2);
initItems(contentView);
//測量高度
int line2Height = ViewUtils.getViewMeasuredHeight(itemViews[0]);
line1DeltaY = -getActionBarHeight() - 40;
line2DeltaY = line1DeltaY - line2Height;
blankView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismissPopup();
}
});
blankView2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismissPopup();
}
});
popupWindow = new PopupWindow(contentView, ScreenUtils.getScreenW(this), ScreenUtils.getScreenH(this));
//隨便設置一個drawable作為背景
popupWindow.setBackgroundDrawable(new ColorDrawable());
}
if (!popupWindow.isShowing()) {
popupWindow.showAsDropDown(topView, 0, 0);
for (int i = 0; i < itemViews.length; i++) {
if (i < 3) {
//第一行
itemViews[i].startAnimation(AnimationHelper.createPopupAnimIn(this, line1DeltaY));
} else {
//第二行
itemViews[i].startAnimation(AnimationHelper.createPopupAnimIn(this, line2DeltaY));
}
}
popupWindow.getContentView().startAnimation(AnimationHelper.createPopupBgFadeInAnim());
}
}
private void dismissPopup() {
if (popupWindow == null || !popupWindow.isShowing()) {
return;
}
ViewGroup contentView = (ViewGroup) popupWindow.getContentView();
contentView.startAnimation(AnimationHelper.createPopupBgFadeOutAnim(AnimationHelper.TIME_OUT));
for (int i = 0; i < itemViews.length; i++) {
if (i < 3) {
//第一行
itemViews[i].startAnimation(AnimationHelper.createPopupAnimOut(this, line1DeltaY));
} else {
//第二行
itemViews[i].startAnimation(AnimationHelper.createPopupAnimOut(this, line2DeltaY));
}
}
//動畫結束時隱藏popupWindow
contentView.postDelayed(new Runnable() {
@Override
public void run() {
popupWindow.dismiss();
}
}, AnimationHelper.TIME_OUT + 10);
}
private View[] itemViews;
//初始化popupWindow上的按鈕
private void initItems(View parent) {
int[] viewIds = new int[]{R.id.yixin_more_item1, R.id.yixin_more_item2, R.id.yixin_more_item3,
R.id.yixin_more_item4, R.id.yixin_more_item5, R.id.yixin_more_item6};
itemViews = new View[viewIds.length];
int itemWidth = ScreenUtils.getScreenW(this) / 3;
OnClickImpl l = new OnClickImpl();
for (int i = 0; i < viewIds.length; i++) {
int id = viewIds[i];
itemViews[i] = parent.findViewById(id);
GridLayout.LayoutParams p = (GridLayout.LayoutParams) itemViews[i].getLayoutParams();
p.width = itemWidth;
itemViews[i].setLayoutParams(p);
itemViews[i].setOnClickListener(l);
}
}
private class OnClickImpl implements View.OnClickListener {
@Override
public void onClick(View v) {
final int viewId = v.getId();
//背景動畫
popupWindow.getContentView().startAnimation(AnimationHelper.createPopupBgFadeOutAnim(AnimationHelper.TIME_OUT_CLICK));
//動畫結束時隱藏popupWindow
v.postDelayed(new Runnable() {
@Override
public void run() {
popupWindow.dismiss();
//動畫結束時響應點擊事件
handleEvent(viewId);
}
}, AnimationHelper.TIME_OUT_CLICK + 10);
//按鈕動畫
for (View item : itemViews) {
if (item.getId() == v.getId()) {
//點擊的按鈕，放大
item.startAnimation(AnimationHelper.createPopupItemBiggerAnim(MainActivity.this));
} else {
//其它按鈕，縮小
item.startAnimation(AnimationHelper.createPopupItemSmallerAnim(MainActivity.this));
}
}
}
}
//popupWindow上按鈕的點擊事件
private void handleEvent(int viewId) {
Toast.makeText(this, "點擊了按鈕：" + viewId, Toast.LENGTH_SHORT).show();
}
private int getActionBarHeight() {
return getSupportActionBar().getHeight();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_more) {
if (popupWindow == null || !popupWindow.isShowing()) {
showPopup();
} else {
dismissPopup();
}
return true;
}
return super.onOptionsItemSelected(item);
}
//點擊返回鍵時，如果popupWindow是顯示狀態，則關閉它
@Override
public void onBackPressed() {
if (popupWindow != null && popupWindow.isShowing()) {
dismissPopup();
return;
}
super.onBackPressed();
}
}2.動畫工具類。
/**
* AnimationHelper
*/
public class AnimationHelper {
/**
* 進入動畫的時間
*/
public static final int TIME_IN = 300;
/**
* 進入動畫之后的反彈動畫時間
*/
public static final int TIME_IN_BACK = 100;
/**
* 退出動畫的時間
*/
public static final int TIME_OUT = 300;
/**
* 點擊PopupWindow上菜單后退出動畫的時間
*/
public static final int TIME_OUT_CLICK = 500;
/**
* PopupWindow上菜單進入動畫
*/
public static Animation createPopupAnimIn(Context context, int fromYDelta) {
AnimationSet animationSet = new AnimationSet(context, null);
// animationSet.setInterpolator(new BounceInterpolator()); //結束時彈跳
animationSet.setFillAfter(true);
//移動
TranslateAnimation translateAnim = new TranslateAnimation(0, 0, fromYDelta, 20);
translateAnim.setDuration(TIME_IN);
animationSet.addAnimation(translateAnim);
//回彈效果
TranslateAnimation translateAnim2 = new TranslateAnimation(0, 0, 0, -20);
translateAnim2.setStartOffset(TIME_IN);
translateAnim2.setDuration(TIME_IN_BACK);
animationSet.addAnimation(translateAnim2);
return animationSet;
}
/**
* PopupWindow上菜單離開動畫
*/
public static Animation createPopupAnimOut(Context context, int toYDelta) {
AnimationSet animationSet = new AnimationSet(context, null);
animationSet.setFillAfter(true);
TranslateAnimation translateAnim = new TranslateAnimation(0, 0, 0, toYDelta);
translateAnim.setDuration(TIME_OUT);
animationSet.addAnimation(translateAnim);
return animationSet;
}
/**
* PopupWindow背景進入動畫（透明度漸變）
*/
public static Animation createPopupBgFadeInAnim() {
AlphaAnimation anim = new AlphaAnimation(0, 1.0f);
anim.setDuration(TIME_IN);
anim.setFillAfter(true);
return anim;
}
/**
* PopupWindow背景離開動畫（透明度漸變）
*/
public static Animation createPopupBgFadeOutAnim(int duration) {
AlphaAnimation anim = new AlphaAnimation(1.0f, 0);
anim.setDuration(duration);
anim.setFillAfter(true);
return anim;
}
/**
* PopupWindow按鈕點擊動畫
*/
public static Animation createPopupItemBiggerAnim(Context context) {
AnimationSet animationSet = new AnimationSet(context, null);
animationSet.setFillAfter(true);
//放大(設置縮放的中心點為自己的中心)
ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 2.0f, 1.0f, 2.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
scaleAnim.setDuration(TIME_OUT_CLICK);
animationSet.addAnimation(scaleAnim);
//漸變
AlphaAnimation alphaAnim = new AlphaAnimation(1.0f, 0);
alphaAnim.setInterpolator(new AccelerateInterpolator());
alphaAnim.setDuration(TIME_OUT_CLICK);
animationSet.addAnimation(alphaAnim);
return animationSet;
}
/**
* PopupWindow按鈕點擊時其它按鈕的動畫
*/
public static Animation createPopupItemSmallerAnim(Context context) {
//放大(設置縮放的中心點為自己的中心)
ScaleAnimation scaleAnim = new ScaleAnimation(1.0f, 0, 1.0f, 0,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
scaleAnim.setDuration(TIME_OUT_CLICK);
scaleAnim.setFillAfter(true);
return scaleAnim;
}
}以上就是Android開發中實現一個彈出框的方法，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。
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