Question

我在我的应用中使用了FloatingActionButton。偶尔，它会重叠基本内容，所以我想这样做，这样用户就可以将FAB拖出去了。

本身不需要拖放功能。它只需要是可移动的。文档没有提到这一点，但我确信我已经在其他应用程序中看到了这样的功能。

你能否建议/提供一个代码片段（最好用XML格式）。

Answer 1

所以，你想创建一个Movable FloatingActionButton，呵呵？！

基于this answer for another SO question这是我创建的代码。它似乎运行良好（具有工作点击功能）并且不依赖于FAB的父布局或定位......

package com.example;

import android.content.Context;
import android.support.design.widget.FloatingActionButton;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;

public class MovableFloatingActionButton extends FloatingActionButton implements View.OnTouchListener {

    private final static float CLICK_DRAG_TOLERANCE = 10; // Often, there will be a slight, unintentional, drag when the user taps the FAB, so we need to account for this.

    private float downRawX, downRawY;
    private float dX, dY;

    public MovableFloatingActionButton(Context context) {
        super(context);
        init();
    }

    public MovableFloatingActionButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MovableFloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(View view, MotionEvent motionEvent){

        ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams)view.getLayoutParams();

        int action = motionEvent.getAction();
        if (action == MotionEvent.ACTION_DOWN) {

            downRawX = motionEvent.getRawX();
            downRawY = motionEvent.getRawY();
            dX = view.getX() - downRawX;
            dY = view.getY() - downRawY;

            return true; // Consumed

        }
        else if (action == MotionEvent.ACTION_MOVE) {

            int viewWidth = view.getWidth();
            int viewHeight = view.getHeight();

            View viewParent = (View)view.getParent();
            int parentWidth = viewParent.getWidth();
            int parentHeight = viewParent.getHeight();

            float newX = motionEvent.getRawX() + dX;
            newX = Math.max(layoutParams.leftMargin, newX); // Don't allow the FAB past the left hand side of the parent
            newX = Math.min(parentWidth - viewWidth - layoutParams.rightMargin, newX); // Don't allow the FAB past the right hand side of the parent

            float newY = motionEvent.getRawY() + dY;
            newY = Math.max(layoutParams.topMargin, newY); // Don't allow the FAB past the top of the parent
            newY = Math.min(parentHeight - viewHeight - layoutParams.bottomMargin, newY); // Don't allow the FAB past the bottom of the parent

            view.animate()
                    .x(newX)
                    .y(newY)
                    .setDuration(0)
                    .start();

            return true; // Consumed

        }
        else if (action == MotionEvent.ACTION_UP) {

            float upRawX = motionEvent.getRawX();
            float upRawY = motionEvent.getRawY();

            float upDX = upRawX - downRawX;
            float upDY = upRawY - downRawY;

            if (Math.abs(upDX) < CLICK_DRAG_TOLERANCE && Math.abs(upDY) < CLICK_DRAG_TOLERANCE) { // A click
                return performClick();
            }
            else { // A drag
                return true; // Consumed
            }

        }
        else {
            return super.onTouchEvent(motionEvent);
        }

    }

}

这是XML ......

    <com.example.MovableFloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_navigate_next_white_24dp"/>

基本上，您只需要在XML中将android.support.design.widget.FloatingActionButton替换为com.example.MovableFloatingActionButton。

Answer 2

您只需在onTouch {/ 1>}上实施View即可尝试以下方式

<强> XML

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:id="@+id/rootlayout"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</FrameLayout>

<强>的java

public class dragativity extends AppCompatActivity implements View.OnTouchListener{

    FloatingActionButton fab;

    FrameLayout rootlayout;

     int _xDelta;
     int _yDelta;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.drag);

        rootlayout = (FrameLayout) findViewById(R.id.rootlayout);

        fab = (FloatingActionButton) findViewById(R.id.fab);

        FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(150, 150);
        fab.setLayoutParams(layoutParams);
        fab.setOnTouchListener(dragativity.this);
    }

    public boolean onTouch(View view, MotionEvent event) {
        final int X = (int) event.getRawX();
        final int Y = (int) event.getRawY();
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                FrameLayout.LayoutParams lParams = (FrameLayout.LayoutParams) view.getLayoutParams();
                _xDelta = X - lParams.leftMargin;
                _yDelta = Y - lParams.topMargin;
                break;
            case MotionEvent.ACTION_UP:
                break;
            case MotionEvent.ACTION_POINTER_DOWN:
                break;
            case MotionEvent.ACTION_POINTER_UP:
                break;
            case MotionEvent.ACTION_MOVE:
                FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) view
                        .getLayoutParams();
                layoutParams.leftMargin = X - _xDelta;
                layoutParams.topMargin = Y - _yDelta;
                layoutParams.rightMargin = -250;
                layoutParams.bottomMargin = -250;
                view.setLayoutParams(layoutParams);
                break;
        }
        rootlayout.invalidate();
        return true;
    }


}

Answer 3

尝试一下：

public class MainActivity extends AppCompatActivity implements View.OnTouchListener {
  float dX;
  float dY;
  int lastAction;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final View dragView = findViewById(R.id.draggable_view);
    dragView.setOnTouchListener(this);
  }

  @Override
  public boolean onTouch(View view, MotionEvent event) {
    switch (event.getActionMasked()) {
      case MotionEvent.ACTION_DOWN:
        dX = view.getX() - event.getRawX();
        dY = view.getY() - event.getRawY();
        lastAction = MotionEvent.ACTION_DOWN;
        break;

      case MotionEvent.ACTION_MOVE:
        view.setY(event.getRawY() + dY);
        view.setX(event.getRawX() + dX);
        lastAction = MotionEvent.ACTION_MOVE;
        break;

      case MotionEvent.ACTION_UP:
        if (lastAction == MotionEvent.ACTION_DOWN)
          Toast.makeText(DraggableView.this, "Clicked!", Toast.LENGTH_SHORT).show();
        break;

      default:
        return false;
    }
    return true;
  }
}

和XML：

<ImageButton
        android:id="@+id/draggable_view"
        android:background="@mipmap/ic_launcher"
        android:layout_gravity="bottom|right"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

您可以将任意视图设为可拖动和可点击。

Answer 4

实际上，您可以只使用android.support.design.widget.CoordinatorLayout而不是Relative布局或任何其他布局，这将起作用（移动FAB）

Answer 5

基于@ ban-geoengineering答案，我更新为执行涟漪效应和左右重力，如faceebook聊天气泡。如果在此代码块内消耗了触摸事件，我就创建了自定义的点击侦听器cuz，它的波纹效果无法清晰显示。

    <com.sample.DraggableFloatingActionButton
    android:id="@+id/connect_to_support_fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_marginLeft="@dimen/spacing_10pt"
    android:layout_marginRight="@dimen/spacing_10pt"
    android:layout_marginBottom="@dimen/spacing_16pt"
    android:clickable="true"
    android:focusable="true"
    app:backgroundTint="@color/colorGreen"
    app:fabSize="normal"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:rippleColor="@color/colorWhite"
    app:srcCompat="@drawable/ic_live_support"
    app:tint="@color/colorWhite" />

package com.sample;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.OvershootInterpolator;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

public class DraggableFloatingActionButton extends FloatingActionButton implements View.OnTouchListener {
    CustomClickListener customClickListener;

    private final static float CLICK_DRAG_TOLERANCE = 10; // Often, there will be a slight, unintentional, drag when the user taps the FAB, so we need to account for this.

    private float downRawX, downRawY;
    private float dX, dY;

    int viewWidth;
    int viewHeight;

    int parentWidth;
    int parentHeight;

    float newX;
    float newY;

    public DraggableFloatingActionButton(Context context) {
        super(context);
        init();
    }

    public DraggableFloatingActionButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public DraggableFloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {

        ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) view.getLayoutParams();

        int action = motionEvent.getAction();
        if (action == MotionEvent.ACTION_DOWN) {

            downRawX = motionEvent.getRawX();
            downRawY = motionEvent.getRawY();
            dX = view.getX() - downRawX;
            dY = view.getY() - downRawY;

            return false; // not Consumed for ripple effect

        } else if (action == MotionEvent.ACTION_MOVE) {

            viewWidth = view.getWidth();
            viewHeight = view.getHeight();

            View viewParent = (View) view.getParent();
            parentWidth = viewParent.getWidth();
            parentHeight = viewParent.getHeight();

            newX = motionEvent.getRawX() + dX;
            newX = Math.max(layoutParams.leftMargin, newX); // Don't allow the FAB past the left hand side of the parent
            newX = Math.min(parentWidth - viewWidth - layoutParams.rightMargin, newX); // Don't allow the FAB past the right hand side of the parent

            newY = motionEvent.getRawY() + dY;
            newY = Math.max(layoutParams.topMargin, newY); // Don't allow the FAB past the top of the parent
            newY = Math.min(parentHeight - viewHeight - layoutParams.bottomMargin, newY); // Don't allow the FAB past the bottom of the parent

            view.animate()
                    .x(newX)
                    .y(newY)
                    .setDuration(0)
                    .start();

            return true; // Consumed

        } else if (action == MotionEvent.ACTION_UP) {

            float upRawX = motionEvent.getRawX();
            float upRawY = motionEvent.getRawY();

            float upDX = upRawX - downRawX;
            float upDY = upRawY - downRawY;

            if (newX > ((parentWidth - viewWidth - layoutParams.rightMargin) / 2)) {
                newX = parentWidth - viewWidth - layoutParams.rightMargin;
            } else {
                newX = layoutParams.leftMargin;
            }

            view.animate()
                    .x(newX)
                    .y(newY)
                    .setInterpolator(new OvershootInterpolator())
                    .setDuration(300)
                    .start();

            if (Math.abs(upDX) < CLICK_DRAG_TOLERANCE && Math.abs(upDY) < CLICK_DRAG_TOLERANCE) { // A click
                if (customClickListener != null) {
                    customClickListener.onClick(view);
                }
                return false;// not Consumed for ripple effect
            } else { // A drag
                return false; // not Consumed for ripple effect
            }

        } else {
            return super.onTouchEvent(motionEvent);
        }

    }

    public void setCustomClickListener(CustomClickListener customClickListener) {
        this.customClickListener = customClickListener;
    }

    public interface CustomClickListener {
        void onClick(View view);
    }

}

Answer 6

所有建议的答案都使用OnTouch侦听器，由于可访问性实现，最近的Android API不建议使用。还要注意，startDrag（）方法已过时。开发人员应改用startDragAndDrop（）。我的实现使用OnDragListener（）如下：

定义两个全局浮点变量dX和dY;

将以下代码段放入onCreatView（）方法中，其中 root 是充气机拍摄的根视图（或其他任何可以接收Drop事件的视图）；

final FloatingActionButton fab = root.findViewById(R.id.my_fab);

fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        // Do whatever this button will do on click event
    }
});

root.setOnDragListener(new View.OnDragListener() {
    @Override
    public boolean onDrag(View v, DragEvent event) {
        switch (event.getAction()) {
            case DragEvent.ACTION_DRAG_LOCATION:
                dX = event.getX();
                dY = event.getY();
                break;
            case DragEvent.ACTION_DRAG_ENDED:
                fab.setX(dX-fab.getWidth()/2);
                fab.setY(dY-fab.getHeight()/2);
                break;
        }
        return true;
    }
});


fab.setOnLongClickListener(new View.OnLongClickListener() {
    @Override
    public boolean onLongClick(View v) {
        View.DragShadowBuilder myShadow = new View.DragShadowBuilder(fab);
        v.startDragAndDrop(null, myShadow, null, View.DRAG_FLAG_GLOBAL);
        return true;
    }
});

Answer 7

这是为我工作的听众，公差为70。

private class FloatingOnTouchListener implements View.OnTouchListener {
        private float x;
        private float y;
        private float nowX;
        private float nowY;
        private float downX;
        private float downY;
        private final int tolerance = 70;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                x = (int) event.getRawX();
                y = (int) event.getRawY();
                downX = x;
                downY = y;
            } else
            if (event.getAction() == MotionEvent.ACTION_MOVE) {
                nowX = event.getRawX();
                nowY = event.getRawY();
                float movedX = nowX - x;
                float movedY = nowY - y;
                x = nowX;
                y = nowY;
                iconViewLayoutParams.x = iconViewLayoutParams.x + (int) movedX;
                iconViewLayoutParams.y = iconViewLayoutParams.y + (int) movedY;
                windowManager.updateViewLayout(view, iconViewLayoutParams);
            } else
            if (event.getAction() == MotionEvent.ACTION_UP) {
                float dx = Math.abs(nowX - downX);
                float dy = Math.abs(nowY - downY);
                if (dx < tolerance && dy < tolerance) {
                    Log.d(TAG, "clicou");
                    Log.d(TAG, "dx " + dx);
                    Log.d(TAG, "dy " + dy);
                    windowManager.removeViewImmediate(iconView);
                    windowManager.addView(displayView, layoutParams);
                } else {
                    Log.d(TAG, "dx " + dx);
                    Log.d(TAG, "dy " + dy);
                    return true;
                }
            }
            return true;
        }
    }

Answer 8

您可以尝试此代码 XML

 <com.google.android.material.floatingactionbutton.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginRight="8dp"
    android:id="@+id/dashboardShowActionsFab"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent" />

JAVA

fab.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {


            ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) view.getLayoutParams();

            int action = motionEvent.getAction();
            if (action == MotionEvent.ACTION_DOWN) {

                downRawX = motionEvent.getRawX();
                downRawY = motionEvent.getRawY();
                dX = view.getX() - downRawX;
                dY = view.getY() - downRawY;

                return true; // Consumed

            } else if (action == MotionEvent.ACTION_MOVE) {

                int viewWidth = view.getWidth();
                int viewHeight = view.getHeight();

                View viewParent = (View) view.getParent();
                int parentWidth = viewParent.getWidth();
                int parentHeight = viewParent.getHeight();

                float newX = motionEvent.getRawX() + dX;
                newX = Math.max(layoutParams.leftMargin, newX); // Don't allow the FAB past the left hand side of the parent
                newX = Math.min(parentWidth - viewWidth - layoutParams.rightMargin, newX); // Don't allow the FAB past the right hand side of the parent

                float newY = motionEvent.getRawY() + dY;
                newY = Math.max(layoutParams.topMargin, newY); // Don't allow the FAB past the top of the parent
                newY = Math.min(parentHeight - viewHeight - layoutParams.bottomMargin, newY); // Don't allow the FAB past the bottom of the parent

                view.animate()
                        .x(newX)
                        .y(newY)
                        .setDuration(0)
                        .start();

                return true; // Consumed

            } else if (action == MotionEvent.ACTION_UP) {

                float upRawX = motionEvent.getRawX();
                float upRawY = motionEvent.getRawY();

                float upDX = upRawX - downRawX;
                float upDY = upRawY - downRawY;

                if (Math.abs(upDX) < CLICK_DRAG_TOLERANCE && Math.abs(upDY) < CLICK_DRAG_TOLERANCE) { // A click
                    // return performClick();
                    Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_SHORT).show();

                } else { // A drag
                    return true; // Consumed
                }

            } else {
                //return super.onTouchEvent(motionEvent);
            }

            return true;
        }

Answer 9

这里是一个稍微更新的版本。它可以正确处理涟漪效应，至少对我有用。

public MovableFloatingActionButton(Context context) {
    super(context);
    init();
}

public MovableFloatingActionButton(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public MovableFloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
}

private void init() {
    setOnTouchListener(this);
}

@Override
public boolean onTouch(View view, MotionEvent motionEvent){
    ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams)view.getLayoutParams();

    switch (motionEvent.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            downRawX = motionEvent.getRawX();
            downRawY = motionEvent.getRawY();
            dX = view.getX() - downRawX;
            dY = view.getY() - downRawY;
            return super.onTouchEvent(motionEvent);

        case MotionEvent.ACTION_MOVE:
            int viewWidth = view.getWidth();
            int viewHeight = view.getHeight();

            View viewParent = (View)view.getParent();
            int parentWidth = viewParent.getWidth();
            int parentHeight = viewParent.getHeight();

            float newX = motionEvent.getRawX() + dX;
            newX = Math.max(layoutParams.leftMargin, newX);
            newX = Math.min(parentWidth - viewWidth - layoutParams.rightMargin, newX);

            float newY = motionEvent.getRawY() + dY;
            newY = Math.max(layoutParams.topMargin, newY);
            newY = Math.min(parentHeight - viewHeight - layoutParams.bottomMargin, newY);

            view.animate().x(newX).y(newY).setDuration(0).start();
            setPressed(false);
            return true;

        case MotionEvent.ACTION_UP:
            final float upRawX = motionEvent.getRawX();
            final float upRawY = motionEvent.getRawY();

            final float upDX = upRawX - downRawX;
            final float upDY = upRawY - downRawY;

            final boolean isDrag = Math.abs(upDX) >= CLICK_DRAG_TOLERANCE || Math.abs(upDY) >= CLICK_DRAG_TOLERANCE;
            return isDrag || performClick();

        default:
            return super.onTouchEvent(motionEvent);

    }
}

Android - 可移动/可拖动浮动操作按钮（FAB）

9 个答案: