由于项目需求，需要实现一个应用内悬浮窗功能，要求是：
- 点击悬浮窗图标可以跳转到一个固定的Activity A；
- 用户在app内的任一activity里都能看到悬浮窗(除了Activity A)
- 悬浮窗可以关闭，可以拖动，拖动过程中松手可以自动吸附到屏幕边缘。
经过搜索，我发现了一个第三方库EasyFloat（https://github.com/princekin-f/EasyFloat），功能相当强大。
EasyFloat_intro.png
EasyFloat支持四种悬浮窗：
| 类型 | 特点 | 是否需要悬浮窗权限 |
|---|---|---|
| CURRENT_ACTIVITY | 只在当前Activity显示 | 否 |
| FOREGROUND | 仅应用前台时显示 | 是 |
| BACKGROUND | 仅应用后台时显示 | 是 |
| ALL_TIME | 一直显示（不分前后台） | 是 |
那么问题来了，我要实现的功能是应用内的悬浮窗，回到桌面后没必要继续显示悬浮窗。所以我并不想申请悬浮窗权限。何况由于不同安卓手机系统的限制，悬浮窗权限没有一个统一的申请方式，需要针对不同手机系统做单独适配，测试起来也麻烦。
既然CURRENT_ACTIVITY不需要权限，那么有没有办法通过CURRENT_ACTIVITY 来实现应用内全局悬浮窗呢？
思路：
- 每打开一个activity，就创建一个
CURRENT_ACTIVITY类型的悬浮窗，如果创建的速度足够快，用户会以为所有界面的悬浮窗都是同一个； - 拖动悬浮窗后，记录下它的坐标。当跳转到别的activity时，将新创建的悬浮窗的位置设置成已保存的坐标。
经过测试，这个方案完全可行。以下是实现步骤：
1. 实现悬浮窗界面：
App.java:
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
EasyFloat.init(this, true);
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(@NonNull Activity activity, @Nullable Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(@NonNull Activity activity) {
}
@Override
public void onActivityResumed(@NonNull Activity activity) {
doOnActivityResume(activity);
}
@Override
public void onActivityPaused(@NonNull Activity activity) {
}
@Override
public void onActivityStopped(@NonNull Activity activity) {
doOnActivityStopped(activity);
}
@Override
public void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle outState) {
}
@Override
public void onActivityDestroyed(@NonNull Activity activity) {
}
});
}
private static final String TAG_FLOAT_VIEW = "TAG_FLOAT_VIEW";
private void doOnActivityResume(Activity activity) {
EasyFloat.Builder builder = EasyFloat.with(activity)
.setLayout(R.layout.layout_float_window)
.setShowPattern(ShowPattern.CURRENT_ACTIVITY)
.setAnimator(null) /*关闭动画*/
.setSidePattern(SidePattern.RESULT_HORIZONTAL) /*吸附效果*/
.setTag(TAG_FLOAT_VIEW);
builder.setGravity(Gravity.RIGHT | Gravity.CENTER_VERTICAL);
builder.show();
}
private void doOnActivityStopped(Activity activity) {
EasyFloat.dismiss(activity, TAG_FLOAT_VIEW);//关闭前一个界面的悬浮窗
}
}
layout_float_window.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/bg_float_view">
<TextView
android:id="@+id/click_view_float"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:gravity="center"
android:text="点我"
android:textColor="#fff"
android:textSize="24sp">
</TextView>
<ImageView
android:id="@+id/click_view_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@id/click_view_float"
android:layout_alignParentTop="true"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:padding="3dp"
android:src="@drawable/ic_close_circle">
</ImageView>
</RelativeLayout>
实现效果:
效果1
期间遇到一个编译错误：
easyfloat的dismiss方法找不到
查询资料得知，这是由于EasyFloat是kotlin实现的，而我的工程是java开发的，根据 https://www.cnblogs.com/yubo0522/p/11534474.html， 加上kotlin相关支持即可。
2. 实现点击事件
private static final String TAG_FLOAT_VIEW = "TAG_FLOAT_VIEW";
private void doOnActivityResume(Activity activity) {
//客服界面不弹出悬浮窗
if (activity instanceof CustomerServiceActivity){
return;
}
EasyFloat.Builder builder = EasyFloat.with(activity)
.setLayout(R.layout.layout_float_window, new OnInvokeView() {
@Override
public void invoke(View view) {
View click_view_float = view.findViewById(R.id.click_view_float);
View click_view_close = view.findViewById(R.id.click_view_close);
click_view_float.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CustomerServiceActivity.start(view.getContext());
}
});
click_view_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismissFloatView(activity);
}
});
}
})
.setShowPattern(ShowPattern.CURRENT_ACTIVITY)
.setAnimator(null)
.setSidePattern(SidePattern.RESULT_HORIZONTAL)
.setTag(TAG_FLOAT_VIEW);
builder.setGravity(Gravity.RIGHT | Gravity.CENTER_VERTICAL);
builder.show();
}
private void dismissFloatView(Activity activity) {
EasyFloat.dismiss(activity, TAG_FLOAT_VIEW);
}
private void doOnActivityStopped(Activity activity) {
dismissFloatView(activity);
}
效果图：
添加点击事件-效果图
3. 拖动后记录位置
App.java:
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
EasyFloat.init(this, true);
registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
@Override
public void onActivityCreated(@NonNull Activity activity, @Nullable Bundle savedInstanceState) {
}
@Override
public void onActivityStarted(@NonNull Activity activity) {
}
@Override
public void onActivityResumed(@NonNull Activity activity) {
doOnActivityResume(activity);
}
@Override
public void onActivityPaused(@NonNull Activity activity) {
}
@Override
public void onActivityStopped(@NonNull Activity activity) {
doOnActivityStopped(activity);
}
@Override
public void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle outState) {
}
@Override
public void onActivityDestroyed(@NonNull Activity activity) {
}
});
}
private static final String TAG_FLOAT_VIEW = "TAG_FLOAT_VIEW";
private static int floatXOffset;
private static int floatYOffset;
private static boolean hasDragged = false;
private void doOnActivityResume(Activity activity) {
//客服界面不弹出悬浮窗
if (activity instanceof CustomerServiceActivity) {
return;
}
EasyFloat.Builder builder = EasyFloat.with(activity)
.setLayout(R.layout.layout_float_window, new OnInvokeView() {
@Override
public void invoke(View view) {
View click_view_float = view.findViewById(R.id.click_view_float);
View click_view_close = view.findViewById(R.id.click_view_close);
click_view_float.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CustomerServiceActivity.start(view.getContext());
}
});
click_view_close.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismissFloatView(activity);
}
});
}
})
.setShowPattern(ShowPattern.CURRENT_ACTIVITY)
.setAnimator(null)
.setSidePattern(SidePattern.RESULT_HORIZONTAL)
.setTag(TAG_FLOAT_VIEW);
if (!hasDragged) {
builder.setGravity(Gravity.RIGHT | Gravity.CENTER_VERTICAL);
} else {
builder.setLocation(floatXOffset, floatYOffset);
}
builder.registerCallbacks(new OnFloatCallbacks() {
@Override
public void createdResult(boolean b, @org.jetbrains.annotations.Nullable String s, @org.jetbrains.annotations.Nullable View view) {
}
@Override
public void show(@NotNull View view) {
}
@Override
public void hide(@NotNull View view) {
}
@Override
public void dismiss() {
}
@Override
public void touchEvent(@NotNull View view, @NotNull MotionEvent motionEvent) {
}
@Override
public void drag(@NotNull View view, @NotNull MotionEvent motionEvent) {
}
@Override
public void dragEnd(@NotNull View view) {
//拖动结束
hasDragged = true;
saveFloatViewPosition(activity);
}
});
builder.show();
}
private void saveFloatViewPosition(Activity activity) {
View floatView = EasyFloat.getFloatView(activity, TAG_FLOAT_VIEW);
if (floatView != null) {
//获取悬浮窗的位置
int[] outLocation = new int[2];
floatView.getLocationInWindow(outLocation);
floatXOffset = outLocation[0];
floatYOffset = outLocation[1] - Utils.getToolbarHeight(floatView.getContext()) - Utils.getStatusBarHeight(activity);
}
}
private void dismissFloatView(Activity activity) {
EasyFloat.dismiss(activity, TAG_FLOAT_VIEW);
}
private void doOnActivityStopped(Activity activity) {
dismissFloatView(activity);
}
}
Utils.java:
public class Utils {
public static int getStatusBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public static int getToolbarHeight(Context context) {
TypedValue tv = new TypedValue();
if (context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
int height = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
return height;
}
return 0;
}
}
最终实现效果：
记录悬浮窗的位置-效果图
