Android之 弹框总结
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一 简介
1 弹框即浮与页面之上的窗口，如键盘弹框，吐司弹框，确认弹框，下拉选择框，应用悬浮框等
2 弹框控件也很多，比如常用的Spinner，Dialog，Toast，PopWindow等，以及新增的SnackBar，DialogFragment等。
二 Spinner下拉选择使用
1 Spinner根Listview，Gridview等是同一时代的产物，所以用法也根它们差不多，主要用到BaseAdapter来加载数据源
2 用系统提供的Adapter，使用简单，但样式固定，数据模型固定，只能是String类型。
效果图
布局文件，添加Spinner控件
java文件设置数据源和是配置
private void initSystemAdapter(){ //设置数据源 List list = new ArrayList(); list.add("苹果"); list.add("香蕉"); list.add("橘子"); list.add("香蕉"); //设置系统适配器 ArrayAdapter adapter=new ArrayAdapter(this, android.R.layout.simple_spinner_item,list); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); //设置弹出偏移位置 spinner.setDropDownVerticalOffset(40); //点击监听 spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView parent, View view, int position, long id) { Toast.makeText(SpinnerActivity.this, list.get(position), Toast.LENGTH_SHORT).show(); } }); } 注意：系统Adapter样式固定，有以下几种
simple_spinner_dropdown_item(列表-间距较高比较好看)
simple_spinner_item(列表-间距紧凑不好看)
simple_list_item_checked（复选框-选中的有绿沟）
simple_list_item_single_choice (单选按钮)
3 自定义适配器，灵活度高，可以设置任何类型的数据源和样式
效果图
自定义条目布局 item_fruit_list.xml
自定义数据源 FruitBean.java
public class FruitBean { public String name; public FruitBean(String name) { this.name = name; }}自定义适配器CustomerAdapter.java
public class CustomerAdapter extends BaseAdapter { private Context mContext; private List mList; public CustomerAdapter(Context mContext, List mList) { this.mContext = mContext; this.mList = mList; } @Override public int getCount() { return mList.size(); } @Override public Object getItem(int position) { return mList.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if (convertView == null) { holder = new ViewHolder(); convertView = LayoutInflater.from(mContext).inflate(R.layout.item_fruit_list, null); holder.tvName = (TextView) convertView.findViewById(R.id.tv_name); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.tvName.setText(mList.get(position).name); return convertView; } class ViewHolder { public TextView tvName; }} spinner配置自定义适配器
private void initCustomerAdapter(){//设置数据源List list = new ArrayList<>();list.add(new FruitBean("苹果"));list.add(new FruitBean("香蕉"));list.add(new FruitBean("橘子"));list.add(new FruitBean("香蕉"));//设置系统适配器CustomerAdapter customerAdapter=new CustomerAdapter(this,list);spinner.setAdapter(customerAdapter);//设置弹出偏移位置spinner.setDropDownVerticalOffset(40);} 三 Dialog的使用
1 Dialog是除了Toast之外，用的最频繁的弹框，各种加载框，提示框，选择框也大都用的Dialog
2 Dialog支持任意布局，以及弹出位置，所以非常灵活。
2 示例效果图
3 创建自定义Dialog
dialog_confirm.xm
设置dialog样式custom_dialog.style，半透明度，标题，背景，弹出动画等等
需要继承系统Dialog父类
public class ConfirmDialog extends Dialog { private Context context; private TextView tvTitle; private TextView tvContent; private TextView tvCancel; private TextView tvSure; private String title, content, cancelString, sureString; public interface OnViewClickLiatener { void sureClick(); void cancelClick(); } public OnViewClickLiatener onViewClickLiatener; public void setOnViewClickLiatener(OnViewClickLiatener onViewClickLiatener) { this.onViewClickLiatener = onViewClickLiatener; } public ConfirmDialog(Context context) { this(context, R.style.custom_dialog); } public ConfirmDialog(Context context, int themeResId) { super(context, themeResId); this.context = context; } public ConfirmDialog(Context context, int themeResId, String title, String content, String cancelString, String sureString) { super(context, themeResId); this.context = context; this.title = title; this.content = content; this.cancelString = cancelString; this.sureString = sureString; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.dialog_confirm); setCanceledOnTouchOutside(true); WindowManager.LayoutParams params = getWindow().getAttributes(); params.width = (int) (ScreenUtils.getScreenWidth((Activity) context) * 0.8f); params.height = ViewGroup.LayoutParams.WRAP_CONTENT; getWindow().setGravity(Gravity.CENTER); getWindow().setAttributes(params); getWindow().setBackgroundDrawableResource(R.color.trans); initView(); setData(); } public void initView() { tvTitle = (TextView) findViewById(R.id.tv_title); tvContent = (TextView) findViewById(R.id.tv_content); tvCancel = (TextView) findViewById(R.id.tv_cancel); tvSure = (TextView) findViewById(R.id.tv_sure); } public void setData() { if (!TextUtils.isEmpty(title)) { tvTitle.setText(title); } if (!TextUtils.isEmpty(content)) { tvContent.setText(content); } if (!TextUtils.isEmpty(cancelString)) { tvCancel.setText(cancelString); } if (!TextUtils.isEmpty(sureString)) { tvSure.setText(sureString); } tvCancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dismiss(); if (onViewClickLiatener != null) { onViewClickLiatener.cancelClick(); } } }); tvSure.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { dismiss(); if (onViewClickLiatener != null) { onViewClickLiatener.sureClick(); } } }); } @Override public void dismiss() { super.dismiss(); }}使用
ConfirmDialog showCancelDialog; public void showCancelDialog(String reportOrderNo, String storeCode) { if (showCancelDialog == null) { showCancelDialog = new ConfirmDialog(activity, "取消提醒", "取消后将不再对已添加的内容进行保存", "暂不取消", "确认取消"); showCancelDialog.setOnViewClickLiatener(new ConfirmDialog.OnViewClickLiatener() { @Override public void sureClick() { if (TextUtils.isEmpty(reportOrderNo)) { activity.finish(); } else { httpReportOrderCancel(reportOrderNo, storeCode); } } @Override public void cancelClick() { } }); } if (!showCancelDialog.isShowing()) { showCancelDialog.show(); } }4 设置认为位置的dialog，如下效果图在屏幕右上角，并且有偏移距离
根正常Dialog使用一样，不过在构造函数里面需要传一个view，即对于那个view弹出，通过获取view在屏幕的位置，来设置Dialog的偏移位置。如下示例
public class OtherUserMainMoreDialog extends Dialog { private DialogViewListener listener; private Activity mContext; private View locationView; private LinearLayout llRemarks; private LinearLayout llPullBlack; private LinearLayout llDeleteFriend; public interface DialogViewListener { void remarksClick(); void pullBlackClick(); void deleteFriend(); } public OtherUserMainMoreDialog(Activity context) { super(context); mContext = context; } public void setDialogViewListener(DialogViewListener listener) { this.listener = listener; } public OtherUserMainMoreDialog(Activity context, int themeResId, View locationView) { super(context, themeResId); mContext = context; this.locationView = locationView; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); View view = LayoutInflater.from(mContext).inflate(R.layout.dialog_other_more, null); setContentView(view); //设置Dialog点击外部消失 setCanceledOnTouchOutside(true); setCancelable(true); //获取控件 textview 的绝对坐标,( y 轴坐标是控件上部到屏幕最顶部（不包括控件本身）) //location [0] 为x绝对坐标;location [1] 为y绝对坐标 int[] location = new int[2]; locationView.getLocationInWindow(location); //获取在当前窗体内的绝对坐标 //获取当前Activity所在的窗体 Window window = getWindow(); WindowManager.LayoutParams wlp = window.getAttributes(); //获取通知栏高度 重要的在这，获取到通知栏高度 int notificationBar = Resources.getSystem().getDimensionPixelSize( Resources.getSystem().getIdentifier("status_bar_height", "dimen", "android")); wlp.x = location[0];//对 dialog 设置 x 轴坐标 wlp.y = location[1] + locationView.getHeight() - notificationBar - 15; //对dialog设置y轴坐标 wlp.gravity = Gravity.TOP; wlp.width = WindowManager.LayoutParams.MATCH_PARENT; window.setAttributes(wlp); llRemarks = (LinearLayout) findViewById(R.id.ll_remarks); llPullBlack = (LinearLayout) findViewById(R.id.ll_pull_black); llDeleteFriend = (LinearLayout) findViewById(R.id.ll_delete_friend); llPullBlack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (listener != null) { listener.pullBlackClick(); } cancel(); } }); llRemarks.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (listener != null) { listener.remarksClick(); } cancel(); } }); llDeleteFriend.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (listener != null) { listener.deleteFriend(); } cancel(); } }); }}5 DIalog使用注意：
由于DIalog必须依赖与一个Activty，如果Activity意外销毁，那Dialog再去弹出或者消息就会找不到该Activity，从而发生崩溃。解决方法如下：
- 把Activity设置为弱引用，以便Activity销毁时，持有Activity的对象能够及时回收。
- 在Dialog弹出消息前判断是否Activity存活，从而保证安全弹出或者消息
如下处理：
@Overridepublic void dismiss() {if (context == null || ((Activity) context).isDestroyed() || ((Activity) context).isFinishing()) {return;}super.dismiss();}@Overridepublic void show() {if (context == null || ((Activity) context).isDestroyed() || ((Activity) context).isFinishing()) {return;}super.show();}四，Toast的使用
1 最简单使用，调用系统api
Toast.makeText(context, "提示消息", Toast.LENGTH_SHORT).show();2 设置Toast的位置，顶部，中间，底部等位置
Toast toast = Toast.makeText(context, "提示消息", Toast.LENGTH_SHORT);toast.setGravity(Gravity.TOP, 0, 0);toast.show();3 控制短时间内弹出频率
private static String oldMsg; protected static Toast toast = null; private static long oneTime = 0; private static long twoTime = 0; public static void showToast(Context context, String s, int gravity, int offX, int offY) { if (toast == null) { toast = Toast.makeText(context, s, Toast.LENGTH_SHORT); toast.setGravity(gravity, offX, offY); toast.show(); oneTime = System.currentTimeMillis(); } else { twoTime = System.currentTimeMillis(); if (s.equals(oldMsg)) { if (twoTime - oneTime > Toast.LENGTH_SHORT) { toast.show(); } } else { oldMsg = s; toast.setText(s); toast.show(); } } oneTime = twoTime; }4 自定义Toast布局样式
private static TextView textView; public static void showPicToast(Context context, String text) { if (toast == null) { // 1. 创建前 2.消失后toast为null // 获取打气筒 LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //创建视图 View view = inflater.inflate(R.layout.toast_bg, null); textView = (TextView) view.findViewById(R.id.tv_toast_text); //创建土司 toast = new Toast(context); //设置居中方式 默认在底部 //toast.setGravity(Gravity.CENTER, 0, 0);//如果不设置剧中方式,使用系统默认的吐司位置 //设置土司的持续时长 toast.setDuration(Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); //设置土司的背景View toast.setView(view); } //设置土司的显示额内容 textView.setText(text); toast.show(); }5 使用注意：
Android 30之后Toast位置参数将失效，设置位置也会跟随系统的位置，所以Google建议用SnackBar来替换Toast。
如果坚持用Toast那么推荐一个Toast库，可以设置Toast位置，如下添加依赖库
implementation 'com.hjq:toast:8.8'在application里面初始化
ToastUtils.init(this);在其它位置弹出该Toast
ToastUtils.show("提示消息");五 SnackBar
1
2 简单使用
public void snackbar1(View view) { Snackbar.make(this,llRootLayout,"snack bar",Snackbar.LENGTH_SHORT).show();}第一个参数是Context
第二个参数是要显示的view
第三个参数是显示的字符串
第四个参数是显示时长，时长有下面三种：
Snackbar.LENGTH_SHORT与Toast.LENGHT_SHORT(大约1秒多)一样显示较短时长后自动消失
Snackbar.LENGTH_LONG与Toast.LENGHT_LONG(大约3秒)一样显示相对较长时间后自动消失
Snackbar.LENGTH_INDEFINITE:永不消失除非手动调用dismiss()方法去除Snackbar
3 交互使用
public void snackbar2(View view) {Snackbar snack_bar = Snackbar.make(this,view, "确定退出吗？", Snackbar.LENGTH_INDEFINITE);snack_bar.setAction("确认", new View.OnClickListener() {@Overridepublic void onClick(View v) {//退出}});snack_bar.show();}4 自定义布局SnackBar
布局snackbar_view.xml
工具类SnackBarUtil.java
public class SnackBarUtil { //自定义 SnackBar 布局 public static void show(Activity activity, View view, String msg, String action, SnackBarOnClick listener) { //获取示例 findViewById(android.R.id.content) //LENGTH_LONG/LENGTH_SHORT: 会自动消失 LENGTH_INDEFINITE: 需要手动点击消失 Snackbar snackbar = Snackbar.make(view, "", Snackbar.LENGTH_SHORT); //设置 Snackbar 的深度，避免被其他控件遮挡 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { snackbar.getView().setElevation(0); } //设置背景透明，避免自带黑色背景影响 snackbar.getView().setBackgroundColor(Color.TRANSPARENT); //设置padding 取消自定义时黑色边框 snackbar.getView().setPadding(0, 0, 0, 0); Snackbar.SnackbarLayout snackbarLayout = (Snackbar.SnackbarLayout) snackbar.getView(); //设置SnackBar的显示位置 //ViewGroup.LayoutParams layoutParams = snackbarLayout.getLayoutParams(); FrameLayout.LayoutParams flp = new FrameLayout.LayoutParams(dip2px(activity,260),dip2px(activity,32)); // 将原来Snackbar的宽高传入新的LayoutParams flp.gravity = Gravity.CENTER | Gravity.BOTTOM; // 设置显示位置 flp.bottomMargin = dip2px(activity,8); ((View) snackbarLayout).setLayoutParams(flp); //获取自定义布局 View inflate = LayoutInflater.from(activity).inflate(R.layout.snackbar_view, null); //获取布局内控件 TextView textView = inflate.findViewById(R.id.textView); //TextView 前边添加图片 //Drawable drawable = getResources().getDrawable(R.mipmap.ic_launcher_round);//图片自己选择 //drawable.setBounds(0, 0, drawable.getMinimumWidth(), drawable.getMinimumHeight()); //textView.setCompoundDrawables(drawable, null, null, null); //增加文字和图标的距离 //textView.setCompoundDrawablePadding(20); //设置文本 textView.setText(msg); if (action != null && listener != null) { TextView textViewSub = inflate.findViewById(R.id.textViewSub); textViewSub.setVisibility(View.VISIBLE); textViewSub.setText(action); textViewSub.setOnClickListener(v -> { if (listener != null) { listener.clickEvent(snackbar); } }); } //添加图片 获取布局内控件 //ImageView imageView = inflate.findViewById(R.id.imageView2); //获取图片资源 //Drawable drawable = activity.getResources().getDrawable(closeIcon); //设置图片 //imageView.setImageDrawable(drawable); //将自定义布局添加到 Snackbar 中 snackbarLayout.addView(inflate); //显示 snackbar.show(); } public interface SnackBarOnClick { void clickEvent(Snackbar snackbar); } public static int dip2px(Activity activity, float dpValue) { final float scale = activity.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); }}调用工具类SnackBarUtil
public void snackbar3(View view) { SnackBarUtil.show(this, view, "确定退出吗？", "确认", new SnackBarUtil.SnackBarOnClick() { @Override public void clickEvent(Snackbar snackbar) { //退出 } }); }六 PopWindow下拉弹框使用
1 PopWindow也是一种弹框，相比较Dialog它更多的使用场景是基于某个控件位置的弹出，也支持任意布局和样式
2 示例，添加布局文件，popup_size_listview.xml
3 自定义PopupWindow
public class PopupviewSizeModel extends PopupWindow { private IPopuWindowListener mOnClickListener; private Activity mContext; private RecyclerView recyclerView; private PopupModelListAdapter popupModelListAdapter; private List listString=new ArrayList<>(); public void setPopuWindowListener(IPopuWindowListener mOnClickListener) { this.mOnClickListener = mOnClickListener; } public PopupviewSizeModel(Activity context) { super(context); this.mContext = context; //获取布局文件 View mContentView = LayoutInflater.from(mContext).inflate(R.layout.popup_size_listview, null); initView(mContentView); //设置布局 setContentView(mContentView); int width = context.getWindowManager().getDefaultDisplay().getWidth(); setWidth(ViewGroup.LayoutParams.WRAP_CONTENT); setHeight(ViewGroup.LayoutParams.WRAP_CONTENT); //设置可以点击外部消息 //开始 setOutsideTouchable(true); setFocusable(true);// setBackgroundDrawable(new BitmapDrawable()); setBackgroundDrawable(context.getResources().getDrawable(android.R.color.transparent)); setAnimationStyle(R.style.pop_animation); } private void initView(View contentView) { recyclerView = (RecyclerView) contentView.findViewById(R.id.rcl_view); LinearLayoutManager manager = new LinearLayoutManager(mContext); recyclerView.setLayoutManager(manager); recyclerView.setNestedScrollingEnabled(false); popupModelListAdapter = new PopupModelListAdapter(mContext, R.layout.item_popup_size_list, listString); recyclerView.setAdapter(popupModelListAdapter); popupModelListAdapter.setOnItemClickListener(new MultiItemTypeAdapter.OnItemClickListener() { @Override public void onItemClick(View view, RecyclerView.ViewHolder holder, int position) { dismiss(); if(mOnClickListener!=null){ mOnClickListener.onItemClick(position); } } @Override public boolean onItemLongClick(View view, RecyclerView.ViewHolder holder, int position) { return false; } }); } public void setListData(List list) { listString.clear(); listString.addAll(list); popupModelListAdapter.setData(listString); popupModelListAdapter.notifyDataSetChanged(); }// / * 在android7.0上，如果不主动约束PopuWindow的大小，比如，设置布局大小为 MATCH_PARENT,那么PopuWindow会变得尽可能大，以至于 view下方无空间完全显示PopuWindow，而且view又无法向上滚动，此时PopuWindow会主动上移位置，直到可以显示完全。// * 解决办法：主动约束PopuWindow的内容大小，重写showAsDropDown方法：// * @param anchor// */// @Override// public void showAsDropDown(View anchor,int xoff,int yoff,int gravity) {// if (Build.VERSION.SDK_INT >= 24) {// Rect visibleFrame = new Rect();// anchor.getGlobalVisibleRect(visibleFrame);// int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;// setHeight(height);// showAsDropDown(anchor, xoff, yoff,gravity);// } else {// showAsDropDown(anchor, xoff, yoff,gravity);// }// super.showAsDropDown(anchor);// } public interface IPopuWindowListener { void onItemClick(int position); }} 4 设置数据模型
publicclass BindSizeListDTO{ public String id; public String name; public BindSizeListDTO(String name) { this.name = name; } }5 在指定view位置弹出该PopupWindow
private PopupviewSizeModel popupviewModelSize;List listStringSize = new ArrayList<>();private void showSizePopup() {listStringSize.add(new InfoBean.BindSizeListDTO("230x150"));listStringSize.add(new InfoBean.BindSizeListDTO("270x200"));listStringSize.add(new InfoBean.BindSizeListDTO("300x200"));listStringSize.add(new InfoBean.BindSizeListDTO("330x225"));listStringSize.add(new InfoBean.BindSizeListDTO("340x239"));if (popupviewModelSize == null) {popupviewModelSize = new PopupviewSizeModel(mContext);popupviewModelSize.setPopuWindowListener(new PopupviewSizeModel.IPopuWindowListener() {@Overridepublic void onItemClick(int position) {Toast.makeText(SnackBarActivity.this, "点击了条目", Toast.LENGTH_SHORT).show();}});}popupviewModelSize.setListData(listStringSize);popupviewModelSize.showAsDropDown(tvSize);} 七 DialogFragment
1 Dialog是依赖与Activity的生命周期，DialogFragment与Dialog不同的是它本质上是一个Fragment，也就具有Fragment所拥有的生命周期，
1 创建DialogFragment的方式，用onCreateDialog来创建系统提供的Dialog
public class SystemDialogFragment extends DialogFragment { @NonNull @Override public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) { AlertDialog dialog = new AlertDialog.Builder(getContext()) .setTitle("系统弹窗") .setMessage("信息") //.setIcon(R.drawable.assign_set_question_ic_v2) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(getContext(), "确认", Toast.LENGTH_SHORT).show(); } }).create(); return dialog; }}Activity中调用该DialogFragment
public class DialogFragmentActivity extends ComponentActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activty_dialog_fragment); } public void alertdialog(View view) { SystemDialogFragment systemDialogFragment=new SystemDialogFragment(); systemDialogFragment.show(getFragmentManager(),"ss"); }}效果：
2 自定义布局DialogFragment
创建布局文件dialog_confirm.xml
创建DialogFragment，CustomerDialogFragment.java
public class CustomerDialogFragment extends DialogFragment { public View mRootView; private TextView tvTitle; private TextView tvContent; private TextView tvCancel; private TextView tvSure; @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { if (mRootView == null){ //获取布局 mRootView = inflater.inflate(R.layout.dialog_confirm,container,false); } tvTitle = (TextView) mRootView.findViewById(R.id.tv_title); tvContent = (TextView) mRootView.findViewById(R.id.tv_content); tvCancel = (TextView) mRootView.findViewById(R.id.tv_cancel); tvSure = (TextView) mRootView.findViewById(R.id.tv_sure); tvCancel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { dismiss(); } }); tvSure.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(getActivity(), "点击确定", Toast.LENGTH_SHORT).show(); dismiss(); } }); return mRootView; }}Activity调用该DialogFragment
public void customerdialog(View view) { CustomerDialogFragment systemDialogFragment=new CustomerDialogFragment(); systemDialogFragment.show(getFragmentManager(),"Customer"); }效果演示
八 系统悬浮框
1 系统悬浮框跟随应用生命周期，可以不在Acitivity上面，不依赖Acitivity，适合全局生命周期的弹框
2 使用，新建布局文件，float_layout_window.xml
2 添加悬浮框权限
3 新建FloatWindowsActivity.java，添加悬浮框布局
public class FloatWindowsActivity extends ComponentActivity { public WindowManager mWindowManager; public View mWindowView; public LinearLayout mText; public WindowManager.LayoutParams wmParams; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activty_float_windows); } public void folatwindows(View view) { checkFloatPermission(); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode==0){ checkFloatPermission(); } } public void checkFloatPermission(){ if(!Settings.canDrawOverlays(FloatWindowsActivity.this)) { Toast.makeText( FloatWindowsActivity.this, "当前无权限，请授权", Toast.LENGTH_SHORT); startActivityForResult( new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse( "package:"+ getPackageName())), 0); }else { initWindowParams(); } } private void initWindowParams() { //1,获取系统级别的WindowManager mWindowManager = (WindowManager) getApplication().getSystemService(getApplication().WINDOW_SERVICE); wmParams = new WindowManager.LayoutParams(); //2,添加系统参数，确保悬浮框能显示到手机上 //电话窗口。它用于电话交互（特别是呼入）。它置于所有应用程序之上，状态栏之下。 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { wmParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY; } else { wmParams.type = WindowManager.LayoutParams.TYPE_PHONE; } // flag 设置 Window 属性 wmParams.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN; //期望的位图格式。默认为不透明 wmParams.format = PixelFormat.TRANSLUCENT; //不许获得焦点 wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE; //窗口停靠位置 wmParams.gravity = Gravity.LEFT | Gravity.TOP; wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT; wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT; addWindowViewZWindow(); initClick(); } private void addWindowViewZWindow() { if(mWindowView==null){ mWindowView = LayoutInflater.from(getApplication()).inflate(R.layout.float_layout_window, null); mText = (LinearLayout) mWindowView.findViewById(R.id.linear); } mWindowManager.addView(mWindowView, wmParams); } int mStartX, mStartY; int mEndX, mEndY; private void initClick() { mText.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { //按下鼠标的时候记录下屏幕的位置 case MotionEvent.ACTION_DOWN: mStartX = (int) event.getRawX(); mStartY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: mEndX = (int) event.getRawX(); mEndY = (int) event.getRawY(); if (needIntercept()) {//getRawX是触摸位置相对于整个屏幕的位置，getX是控触摸点相对于控件最左边的位置wmParams.x = (int) event.getRawX() - mWindowView.getMeasuredWidth() / 2;wmParams.y = (int) event.getRawY() - mWindowView.getMeasuredHeight() / 2;mWindowManager.updateViewLayout(mWindowView, wmParams);return true; } break; case MotionEvent.ACTION_UP: if (needIntercept()) {return true; } break; } return false; } }); mText.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(FloatWindowsActivity.this, "点击悬浮框", Toast.LENGTH_SHORT).show(); } }); } private boolean needIntercept() { if (Math.abs(mStartX - mEndX) > 30 || Math.abs(mStartY - mEndY) > 30) { return true; } return false; }}4 效果图
可以在任意Activity显示
也可以退到桌面仍显示
来源地址：https://blog.csdn.net/qq_29848853/article/details/131057663
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