Android 全局悬浮框（可拖动）

Bertha 。 2023-06-21 12:25 23阅读 0赞

## Android 悬浮框 ##

**效果图：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70_pic_center]  
**代码实现：**

1.  Androidmanifest.xml添加弹框权限

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

1.  自定义悬浮窗类FloatWindow.java

public class FloatWindow implements View.OnTouchListener {
        
    
        private Context mContext;
        private WindowManager.LayoutParams mWindowParams;
        private WindowManager mWindowManager;
    
        private View mFloatLayout;
        private float mInViewX;
        private float mInViewY;
        private float mDownInScreenX;
        private float mDownInScreenY;
        private float mInScreenX;
        private float mInScreenY;
        private TextView infoText;
    
        public FloatWindow(Context context) {
        
            this.mContext = context;
            initFloatWindow();
        }
    
        private void initFloatWindow() {
        
            LayoutInflater inflater = LayoutInflater.from(mContext);
            if(inflater == null)
                return;
            mFloatLayout = (View) inflater.inflate(R.layout.layout_float, null);
            infoText = mFloatLayout.findViewById(R.id.textView);
            mFloatLayout.setOnTouchListener(this);
    
            mWindowParams = new WindowManager.LayoutParams();
            mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
            if (Build.VERSION.SDK_INT >= 26) {
        //8.0新特性
                mWindowParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
            }else{
        
                mWindowParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
            }
            mWindowParams.format = PixelFormat.RGBA_8888;
            mWindowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
            mWindowParams.gravity = Gravity.START | Gravity.TOP;
            mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
            mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        }
    
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
        
            return floatLayoutTouch(motionEvent);
        }
    
        private boolean floatLayoutTouch(MotionEvent motionEvent) {
        
            switch (motionEvent.getAction()) {
        
                case MotionEvent.ACTION_DOWN:
                    // 获取相对View的坐标，即以此View左上角为原点
                    mInViewX = motionEvent.getX();
                    mInViewY = motionEvent.getY();
                    // 获取相对屏幕的坐标，即以屏幕左上角为原点
                    mDownInScreenX = motionEvent.getRawX();
                    mDownInScreenY = motionEvent.getRawY() - getSysBarHeight(mContext);
                    mInScreenX = motionEvent.getRawX();
                    mInScreenY = motionEvent.getRawY() - getSysBarHeight(mContext);
                    break;
                case MotionEvent.ACTION_MOVE:
                    // 更新浮动窗口位置参数
                    mInScreenX = motionEvent.getRawX();
                    mInScreenY = motionEvent.getRawY() - getSysBarHeight(mContext);
                    mWindowParams.x = (int) (mInScreenX- mInViewX);
                    mWindowParams.y = (int) (mInScreenY - mInViewY);
                    // 手指移动的时候更新小悬浮窗的位置
                    mWindowManager.updateViewLayout(mFloatLayout, mWindowParams);
                    break;
                case MotionEvent.ACTION_UP:
                    // 如果手指离开屏幕时，xDownInScreen和xInScreen相等，且yDownInScreen和yInScreen相等，则视为触发了单击事件。
                    if (mDownInScreenX  == mInScreenX && mDownInScreenY == mInScreenY){
        
    
                    }
                    break;
            }
            return true;
        }
    
        public void showFloatWindow(){
        
            if (mFloatLayout.getParent() == null){
        
                DisplayMetrics metrics = new DisplayMetrics();
                // 默认固定位置，靠屏幕右边缘的中间
                mWindowManager.getDefaultDisplay().getMetrics(metrics);
                mWindowParams.x = metrics.widthPixels;
                mWindowParams.y = metrics.heightPixels/2 - getSysBarHeight(mContext);
                mWindowManager.addView(mFloatLayout, mWindowParams);
            }
        }
    
        public void updateText(final String s) {
        
            infoText.setText(s);
        }
    
        public void hideFloatWindow(){
        
            if (mFloatLayout.getParent() != null)
                mWindowManager.removeView(mFloatLayout);
        }
    
        public void setFloatLayoutAlpha(boolean alpha){
        
            if (alpha)
                mFloatLayout.setAlpha((float) 0.5);
            else
                mFloatLayout.setAlpha(1);
        }
    
        // 获取系统状态栏高度
        public static int getSysBarHeight(Context contex) {
        
            Class<?> c;
            Object obj;
            Field field;
            int x;
            int sbar = 0;
            try {
        
                c = Class.forName("com.android.internal.R$dimen");
                obj = c.newInstance();
                field = c.getField("status_bar_height");
                x = Integer.parseInt(field.get(obj).toString());
                sbar = contex.getResources().getDimensionPixelSize(x);
            } catch (Exception e1) {
        
                e1.printStackTrace();
            }
            return sbar;
        }
    }

1.  自定义悬浮窗界面布局文件layout\_float.xml

<?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        xmlns:app="http://schemas.android.com/apk/res-auto">
    
        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/float_win"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"/>
    
        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#00ffffff"
            android:text="hello"
            android:textSize="12sp"
            app:layout_constraintLeft_toLeftOf="@id/imageView"
            app:layout_constraintRight_toRightOf="@id/imageView"
            app:layout_constraintTop_toBottomOf="@id/imageView"/>
    
    </android.support.constraint.ConstraintLayout>

1.  在Activity中使用悬浮窗。

public class MainActivity extends AppCompatActivity {
        
    
        private Button btnShow;
        FloatWindow floatWindow;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        
            super.onCreate(savedInstanceState);
    
            // 权限判断
            if (Build.VERSION.SDK_INT >= 23) {
        
                if(!Settings.canDrawOverlays(getApplicationContext())) {
        
                    // 启动Activity让用户授权
                    Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,Uri.parse("package:" + getPackageName()));
                    startActivityForResult(intent,10);
                } else {
        
                    // 执行6.0以上绘制代码
                    initView();
                }
            } else {
        
                // 执行6.0以下绘制代码
                initView();
            }
        }
    
        @Override
        protected void onResume() {
        
            super.onResume();
            // 权限判断
            if (Build.VERSION.SDK_INT >= 23) {
        
                if(Settings.canDrawOverlays(getApplicationContext())) {
        
                    initView();
                }
            } else {
        
                //执行6.0以下绘制代码
                initView();
            }
        }
    
        private void initView() {
        
            setContentView(R.layout.activity_main);
            floatWindow = new FloatWindow(getApplicationContext());
    
            btnShow = findViewById(R.id.btn_show);
            btnShow.setOnClickListener(new View.OnClickListener() {
        
                @Override
                public void onClick(View view) {
        
                    if (null != floatWindow) {
        
                        floatWindow.showFloatWindow();
                    }
                }
            });
    
            Button btnrefresh = findViewById(R.id.btn_refresh);
            btnrefresh.setOnClickListener(new View.OnClickListener() {
        
                @Override
                public void onClick(View view) {
        
                    int random = (int) (Math.random() * 10);
                    if (null != floatWindow) {
        
                        floatWindow.updateText(String.valueOf(random));
                    }
                }
            });
        }
    
        @Override
        protected void onDestroy() {
        
            super.onDestroy();
            if (null != floatWindow) {
        
                floatWindow.hideFloatWindow();
            }
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/20210125171911599.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RyYWN5ZHJhZ29ubHh5,size_16,color_FFFFFF,t_70#pic_center