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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

xmlns:app="http://schemas.android.com/apk/res-auto">

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"/>

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"/>

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();

}

}

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持云海天教程。