Android实现全局悬浮框

本文实例为大家分享了Android实现全局悬浮框的具体代码，供大家参考，具体内容如下

效果图：

代码实现：

Androidmanifest.xml添加弹框权限

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

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;
}
}

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>

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();
 }
}
}

来源：https://blog.csdn.net/tracydragonlxy/article/details/103513842