android: pindahkan tampilan saat bergerak (ACTION_MOVE)

Saya ingin melakukan kontrol sederhana: sebuah wadah dengan pemandangan di dalamnya. Jika saya menyentuh wadah dan saya menggerakkan jari, saya ingin memindahkan pandangan untuk mengikuti jari saya.

Wadah seperti apa (tata letak) yang harus saya gunakan? Bagaimana cara melakukannya?

Saya tidak perlu menggunakan permukaan, tetapi tata letak yang sederhana.

Sesuatu seperti ini:

public class MyActivity extends Activity implements View.OnTouchListener {

TextView _view;
ViewGroup _root;
private int _xDelta;
private int _yDelta;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    _root = (ViewGroup)findViewById(R.id.root);

    _view = new TextView(this);
    _view.setText("TextView!!!!!!!!");

    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(150, 50);
    layoutParams.leftMargin = 50;
    layoutParams.topMargin = 50;
    layoutParams.bottomMargin = -250;
    layoutParams.rightMargin = -250;
    _view.setLayoutParams(layoutParams);

    _view.setOnTouchListener(this);
    _root.addView(_view);
}

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:
            RelativeLayout.LayoutParams lParams = (RelativeLayout.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:
            RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
            layoutParams.leftMargin = X - _xDelta;
            layoutParams.topMargin = Y - _yDelta;
            layoutParams.rightMargin = -250;
            layoutParams.bottomMargin = -250;
            view.setLayoutParams(layoutParams);
            break;
    }
    _root.invalidate();
    return true;
}}

Dalam main.xmlhanya RelativeLayoutdengan@+id/root

Saya telah menemukan pendekatan yang mudah untuk melakukannya dengan ViewPropertyAnimator:

float dX, dY;

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

    switch (event.getAction()) {

        case MotionEvent.ACTION_DOWN:

            dX = view.getX() - event.getRawX();
            dY = view.getY() - event.getRawY();
            break;

        case MotionEvent.ACTION_MOVE:

            view.animate()
                    .x(event.getRawX() + dX)
                    .y(event.getRawY() + dY)
                    .setDuration(0)
                    .start();
            break;
        default:
            return false;
    }
    return true;
}

Mengikuti pendekatan @Andrey, jika Anda ingin memindahkan tampilan dari pusatnya, Anda hanya perlu mengurangi setengah tinggi dan lebar tampilan ke gerakan.

float dX, dY;

@Override
public boolean onTouchEvent(View view, MotionEvent event) {
    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            dX = view.getX() - event.getRawX();
            dY = view.getY() - event.getRawY();
            break;
        case MotionEvent.ACTION_MOVE:
            view.animate()
                .x(event.getRawX() + dX - (view.getWidth() / 2))
                .y(event.getRawY() + dY - (view.getHeight() / 2))
                .setDuration(0)
                .start();
            break;
        default:
            return false;
    }
    return true;
}

Implementasi yang sama di Kotlin

    rightPanel.setOnTouchListener(View.OnTouchListener { view, event ->
        when (event?.action) {
            MotionEvent.ACTION_DOWN -> {

                rightDX = view!!.x - event.rawX
                // rightDY = view!!.getY() - event.rawY;

            }
            MotionEvent.ACTION_MOVE -> {

                var displacement = event.rawX + rightDX

                view!!.animate()
                        .x(displacement)
                        // .y(event.getRawY() + rightDY)
                        .setDuration(0)
                        .start()
            }
            else -> { // Note the block
                return@OnTouchListener false
            }
        }
        true
 })

Sentuh wadah dan tampilan akan mengikuti jari Anda.

kode xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/floating_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >

    <ImageView
      android:id="@+id/btn_chat"
      android:layout_width="42dp"
      android:layout_height="42dp"
      />

<LinearLayout>

Kode Java

public class DashBoardActivity extends Activity implements View.OnClickListener, View.OnTouchListener {

    float dX;
    float dY;
    int lastAction;
    LinearLayout floatingLayout;

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

        floatingLayout = findViewById(R.id.floating_layout);
        floatingLayout.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(DashBoardActivity.this, "Clicked!", Toast.LENGTH_SHORT).show();
                break;

            default:
                return false;
        }
        return true;
    }
}

Saya sarankan untuk menggunakan view.translationX dan view.translationY untuk memindahkan pandangan Anda.

Cuplikan Kotlin:

yourView.translationX = xTouchCoordinate
yourView.translationY = yTouchCoordinate

Buat kelas pendengar sentuh khusus (di Kotlin):

(Kode ini membatasi tampilan Anda dari menyeret keluar dari tampilan induknya)

class CustomTouchListener(
  val screenWidth: Int, 
  val screenHeight: Int
) : View.OnTouchListener {
    private var dX: Float = 0f
    private var dY: Float = 0f

    override fun onTouch(view: View, event: MotionEvent): Boolean {

        val newX: Float
        val newY: Float

        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                dX = view.x - event.rawX
                dY = view.y - event.rawY
            }
            MotionEvent.ACTION_MOVE -> {

                newX = event.rawX + dX
                newY = event.rawY + dY

                if ((newX <= 0 || newX >= screenWidth - view.width) || (newY <= 0 || newY >= screenHeight - view.height)) {
                    return true
                }

                view.animate()
                    .x(newX)
                    .y(newY)
                    .setDuration(0)
                    .start()
            }
        }
        return true
    }
}

Bagaimana cara menggunakannya?

parentView.viewTreeObserver.addOnGlobalLayoutListener { view.setOnTouchListener(CustomTouchListener(parentView.width, parentView.height)) }

parentView adalah induk dari pandangan Anda.

Dalam kode di bawah ini, saya telah membuat sesuatu yang disebut RegionView( git ), yang merupakan wadah yang dapat digunakan kembali yang bertanggung jawab untuk mengelola operasi seret dan perbesar untuk setiap anak yang bersarang.

Di sini, kita memanipulasi topdan leftkoefisien anak View's LayoutParamsgerakan simulasi tentang diagram. Dengan memisahkan interpretasi penanganan apa yang dipahami sebagai operasi seret, dan apa yang ditentukan sebagai operasi skala, kami dapat memberikan manipulasi yang dapat diandalkan anak View.

package com.zonal.regionview;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.os.Vibrator;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.widget.RelativeLayout;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Alexander Thomas (@Cawfree) on 20/07/2017.
 */

/** Enables users to customize Regions Of Interest on a Canvas. */
public class RegionView extends RelativeLayout implements View.OnTouchListener, GestureDetector.OnGestureListener, ScaleGestureDetector.OnScaleGestureListener {

    /* Member Variables. */
    private final GestureDetector      mGestureDetector;
    private final ScaleGestureDetector mScaleGestureDetector;
    private final Map<Integer, View>   mViewMap;
    private       boolean              mScaling;
    private       float                mScale;
    private       boolean              mWrapContent;
    private       boolean              mDropOnScale;

    public RegionView(Context context) {
        // Implement the Parent.
        super(context);
        // Initialize Member Variables.
        this.mGestureDetector      = new GestureDetector(context, this);
        this.mViewMap              = new HashMap<>();
        this.mScaleGestureDetector = new ScaleGestureDetector(context, this);
        this.mScaling              = false;
        this.mScale                = Float.NaN;
        this.mWrapContent          = false;
        this.mDropOnScale          = false;
        // Register ourself as the OnTouchListener.
        this.setOnTouchListener(this);
    }

    public RegionView(Context context, @Nullable AttributeSet attrs) {
        // Implement the Parent.
        super(context, attrs);
        // Initialize Member Variables.
        this.mGestureDetector      = new GestureDetector(context, this);
        this.mViewMap              = new HashMap<>();
        this.mScaleGestureDetector = new ScaleGestureDetector(context, this);
        this.mScaling              = false;
        this.mWrapContent          = false;
        this.mDropOnScale          = false;
        // Register ourself as the OnTouchListener.
        this.setOnTouchListener(this);
    }

    public RegionView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        // Implement the Parent.
        super(context, attrs, defStyleAttr);
        // Initialize Member Variables.
        this.mGestureDetector      = new GestureDetector(context, this);
        this.mViewMap              = new HashMap<>();
        this.mScaleGestureDetector = new ScaleGestureDetector(context, this);
        this.mScaling              = false;
        this.mWrapContent          = false;
        this.mDropOnScale          = false;
        // Register ourself as the OnTouchListener.
        this.setOnTouchListener(this);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public RegionView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        // Implement the Parent.
        super(context, attrs, defStyleAttr, defStyleRes);
        // Initialize Member Variables.
        this.mGestureDetector      = new GestureDetector(context, this);
        this.mViewMap              = new HashMap<>();
        this.mScaleGestureDetector = new ScaleGestureDetector(context, this);
        this.mScaling              = false;
        this.mWrapContent          = false;
        this.mDropOnScale          = false;
        // Register ourself as the OnTouchListener.
        this.setOnTouchListener(this);
    }

    @Override
    public boolean onTouch(final View v, final MotionEvent event) {
        // Calculate the PointerId.
        final int lPointerId = event.getPointerId(event.getActionIndex());
        // Handle the TouchEvent.
        this.getGestureDetector().onTouchEvent(event);
        this.getScaleGestureDetector().onTouchEvent(event);
        // Did the user release a pointer?
        if(event.getAction() == MotionEvent.ACTION_UP) {
            // Was there a View associated with this Action?
            final View lView = this.getViewMap().get(lPointerId);
            // Does the View exist?
            if(lView != null) {
                // Remove the View from the Map.
                this.getViewMap().remove(lPointerId); /** TODO: Provide a Callback? */
            }
        }
        // Consume all events for now.
        return true;
    }

    @Override
    public boolean onDown(MotionEvent e) {
        // Calculate the PointerId.
        final Integer lPointerId = Integer.valueOf(e.getPointerId(e.getActionIndex()));
        // Fetch the View.
        final View    lView      = this.getViewFor(Math.round(e.getRawX()), Math.round(e.getRawY()));
        // Is it valid?
        if(lView != null) {
            // Watch the View.
            this.getViewMap().put(lPointerId, lView);
            // Configure the Anchor.
            lView.setPivotX(0);
            lView.setPivotY(0);
            // Assert that we handled the event.
            return true;
        }
        // Assert that we ignored the event.
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        // Are we not scaling?
        if(!this.isScaling()) {
            // Calculate the PointerId.
            final Integer lPointerId = Integer.valueOf(e1.getPointerId(e1.getActionIndex()));
            // Fetch the View.
            final View    lView      = this.getViewMap().get(lPointerId);
            // Is the scroll valid for a given View?
            if(lView != null) {
                // Calculate the Scaled Width and Height of the View.
                final float lWidth    = lView.getWidth()  * lView.getScaleX();
                final float lHeight   = lView.getHeight() * lView.getScaleY();
                // Declare the initial position.
                final int[] lPosition = new int[] { (int)(e2.getX() - ((lWidth)  / 2)), (int)(e2.getY() - ((lHeight) / 2)) };
                // Are we wrapping content?
                if(this.isWrapContent()) {
                    // Wrap the Position.
                    this.onWrapContent(lPosition, lWidth, lHeight);
                }
                // Update the Drag.
                this.onUpdateDrag(lView, lPosition);
            }
            // Assert we handled the scroll.
            return true;
        }
        // Otherwise, don't permit scrolling. Don't consume the MotionEvent.
        return false;
    }

    /** Forces X/Y values to be coerced within the confines of the RegionView. */
    private final void onWrapContent(final int[] pPosition, final float pWidth, final float pHeight) {
        // Limit the parameters. (Top-Left)
        pPosition[0] = Math.max(pPosition[0], 0);
        pPosition[1] = Math.max(pPosition[1],  0);
        // Limit the parameters. (Bottom-Right)
        pPosition[0] = Math.min(pPosition[0], (int)(this.getWidth()  - pWidth));
        pPosition[1] = Math.min(pPosition[1], (int)(this.getHeight() - pHeight));
    }

    /** Updates the Drag Position of a child View within the Layout. Implicitly, we update the LayoutParams of the View. */
    private final void onUpdateDrag(final View pView, final int pLeft, final int pTop) {
        // Allocate some new MarginLayoutParams.
        final MarginLayoutParams lMarginLayoutParams = new MarginLayoutParams(pView.getLayoutParams());
        // Update the Margin.
        lMarginLayoutParams.setMargins(pLeft, pTop, 0, 0);
        // Refactor the MarginLayoutParams into equivalent LayoutParams for the RelativeLayout.
        pView.setLayoutParams(new RelativeLayout.LayoutParams(lMarginLayoutParams));
    }

    @Override
    public boolean onScale(ScaleGestureDetector detector) {
        // Calculate the ScaleFactor.
              float lScaleFactor = detector.getScaleFactor() - 1;
        // Fetch the Scaled View.
        final View  lView        = this.getViewMap().entrySet().iterator().next().getValue();
        // Update the ScaleFactor.
        final float lScale       = this.getScale() + lScaleFactor;
        // Calculate the Proposed Width and Height.
        final int   lWidth  = Math.round(lView.getWidth()  * lScale);
        final int   lHeight = Math.round(lView.getHeight() * lScale);
        // Is the View already too large for wrap content?
        if(lWidth >= this.getWidth() || lHeight >= this.getHeight()) {
            // Don't update the scale.
            return false;
        }
        // Persist this Scale for the View.
        lView.setScaleX(lScale);
        lView.setScaleY(lScale);
        // Assign the Scale.
        this.setScale(lScale);
        // Compute the Position.
        final int[] lPosition = new int[] { Math.round(detector.getFocusX()) - (lWidth / 2), Math.round(detector.getFocusY()) - (lHeight / 2) };
        // Are we wrapping the Position?
        if(this.isWrapContent()) {
            // Wrap the Position.
            this.onWrapContent(lPosition, lWidth, lHeight);
        }
        // Update the Drag.
        this.onUpdateDrag(lView, lPosition);
        // Assert that we handled the scale.
        return true;
    }

    /** Update the Drag. */
    private final void onUpdateDrag(final View pView, final int[] pPosition) {
        // Call the sub-implementation.
        this.onUpdateDrag(pView, pPosition[0], pPosition[1]);
    }

    @Override
    public boolean onScaleBegin(ScaleGestureDetector detector) { 
        // Is the user not dragging at all?
        if(this.getViewMap().size() == 1) {
            // Fetch the View.
            final View lView = this.getViewMap().entrySet().iterator().next().getValue();
            // Initialize the Scale.
            this.setScale(lView.getScaleX()); 
            // Assert that we've started scaling.
            this.setScaling(true);
            // Inform the callback.
            return true;
        }
        // Otherwise, don't allow scaling.
        return false;
    }

    @Override
    public void onScaleEnd(ScaleGestureDetector detector) {
        // Were we scaling?
        if(this.isScaling()) {
            // Assert that we've stopped scaling.
            this.setScaling(false);
            // Reset the Scale.
            this.setScale(Float.NaN);
            // Should we stop dragging now that we've finished scaling?
            if(this.isDropOnScale()) {
                // Clear the ViewMap.
                this.getViewMap().clear();
            }
        }
    }

    /** Returns the View colliding with the given co-ordinates. */
    private final View getViewFor(final int pX, final int pY) {
        // Declare the LocationBuffer.
        final int[] lLocationBuffer = new int[2];
        // Iterate the Views.
        for(int i = 0; i < this.getChildCount(); i++) {
            // Fetch the child View.
            final View lView = this.getChildAt(i);
            // Fetch its absolute position.
            lView.getLocationOnScreen(lLocationBuffer);
            // Determine if the MotionEvent collides with the View.
            if(pX > lLocationBuffer[0] && pY > lLocationBuffer[1] && (pX < lLocationBuffer[0] + (lView.getWidth() * lView.getScaleX())) && (pY < lLocationBuffer[1] + (lView.getHeight() * lView.getScaleY()))) {
                // Return the View.
                return lView;
            }
        }
        // We couldn't find a View.
        return null;
    }

    /* Unused Overrides. */
    @Override public void      onShowPress(MotionEvent e) {  }
    @Override public boolean onSingleTapUp(MotionEvent e) {
        return false;
    }
    @Override public void      onLongPress(MotionEvent e) { }
    @Override public boolean       onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { return false; }

    /* Getters and Setters. */
    private final GestureDetector getGestureDetector() {
        return this.mGestureDetector;
    }

    private final ScaleGestureDetector getScaleGestureDetector() {
        return this.mScaleGestureDetector;
    }

    private final Map<Integer, View> getViewMap() {
        return this.mViewMap;
    }

    private final void setScaling(final boolean pIsScaling) {
        this.mScaling = pIsScaling;
    }

    private final boolean isScaling() {
        return this.mScaling;
    }

    private final void setScale(final float pScale) {
        this.mScale = pScale;
    }

    private final float getScale() {
        return this.mScale;
    }

    /** Defines whether we coerce the drag and zoom of child Views within the confines of the Layout. */
    public final void setWrapContent(final boolean pIsWrapContent) {
        this.mWrapContent = pIsWrapContent;
    }

    public final boolean isWrapContent() {
        return this.mWrapContent;
    }

    /** Defines whether a drag operation is considered 'finished' once the user finishes scaling a view. */
    public final void setDropOnScale(final boolean pIsDropOnScale) {
        this.mDropOnScale = pIsDropOnScale;
    }

    public final boolean isDropOnScale() {
        return this.mDropOnScale;
    }

}

Di sini saya menunjukkan contoh use case:

package com.zonal.regionview;

import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.AnalogClock;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Allocate a RegionView.
        final RegionView lRegionView = new RegionView(this);
        // Add some example items to drag.
        lRegionView.addView(new AnalogClock(this));
        lRegionView.addView(new AnalogClock(this));
        lRegionView.addView(new AnalogClock(this));
        // Assert that we only want to drag Views within the confines of the RegionView.
        lRegionView.setWrapContent(true);
        // Assert that after we've finished scaling a View, we want to stop being able to drag it until a new drag is started.
        lRegionView.setDropOnScale(true);
        // Look at the RegionView.
        this.setContentView(lRegionView);
    }

}

Mengubah sedikit solusi yang disediakan oleh @Vyacheslav Shylkin untuk menghapus ketergantungan nomor yang dimasukkan secara manual.

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class MainActivity extends Activity implements View.OnTouchListener
{
    private int       _xDelta;
    private int       _yDelta;
    private int       _rightMargin;
    private int       _bottomMargin;
    private ImageView _floatingView;

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

        this._floatingView = (ImageView) findViewById(R.id.textView);

        this._floatingView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener()
        {
            @Override
            public boolean onPreDraw()
            {
                if (_floatingView.getViewTreeObserver().isAlive())
                    _floatingView.getViewTreeObserver().removeOnPreDrawListener(this);

                updateLayoutParams(_floatingView);
                return false;
            }
        });

        this._floatingView.setOnTouchListener(this);
    }

    private void updateLayoutParams(View view)
    {
        this._rightMargin = -view.getMeasuredWidth();
        this._bottomMargin = -view.getMeasuredHeight();

        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(view.getMeasuredWidth(), view.getMeasuredHeight());
        layoutParams.bottomMargin = this._bottomMargin;
        layoutParams.rightMargin = this._rightMargin;

        view.setLayoutParams(layoutParams);
    }

    @Override
    public boolean onTouch(View view, MotionEvent event)
    {
        if (view == this._floatingView)
        {
            final int X = (int) event.getRawX();
            final int Y = (int) event.getRawY();

            switch (event.getAction() & MotionEvent.ACTION_MASK)
            {
                case MotionEvent.ACTION_DOWN:
                    RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
                    this._xDelta = X - lParams.leftMargin;
                    this._yDelta = Y - lParams.topMargin;
                    break;

                case MotionEvent.ACTION_MOVE:
                    RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
                    layoutParams.leftMargin = X - this._xDelta;
                    layoutParams.topMargin = Y - this._yDelta;
                    layoutParams.rightMargin = this._rightMargin;
                    layoutParams.bottomMargin = this._bottomMargin;
                    view.setLayoutParams(layoutParams);
                    break;
            }

            return true;
        }
        else
        {
            return false;
        }
    }
}

Dalam contoh ini Anda dapat memindahkan tampilan di dalam batas induknya terlepas dari ukurannya, animasi tanpa cacat, dan menangkap klik.

Alasan bahwa solusi ini lebih unggul daripada komentar lain adalah bahwa pendekatan ini menggunakan Directional Pad yang menghitung sendiri dan tidak akan menyampaikan pada posisi Lihat yang merupakan sumber untuk banyak bug.

View view;
Animator.AnimatorListener listener;
boolean onMove = false;
boolean firstAnimation = true;
static final int CLICK_DURATION = 175;

float parentWidth;
float parentHeight;

// Those are the max bounds
// within the contianer
float xBoundMax;
float yBoundMax;

// This variables hold the target
// ordinates for the next
// animation in case an animation
// is already in progress.
float targetX;
float targetY;

float downRawX;
float downRawY;

public boolean onTouchEvent(MotionEvent event)
{
    switch (event.getAction())
    {
        case MotionEvent.ACTION_UP:
            if(event.getEventTime() - event.getDownTime() < CLICK_DURATION) click();
            onMove = false;
            break;
        case MotionEvent.ACTION_DOWN:
            firstAnimation = true;
            xBoundMax = parentWidth - view.getWidth();
            yBoundMax = parentHeight - view.getHeight();
            downRawX = event.getRawX();
            downRawY = event.getRawY();
            break;

        case MotionEvent.ACTION_MOVE:
            if(!onMove)
            {
                if(event.getEventTime() - event.getDownTime() < CLICK_DURATION) break;
                else onMove = true;
            }

            // Calculating the position the
            // view should be posed at.
            float offsetX = event.getRawX() - downRawX;
            float offsetY = event.getRawY() - downRawY;
            downRawX = event.getRawX();
            downRawY = event.getRawY();
            targetX = currentX + offsetX;
            targetY = currentY.getY() + offsetY;

            // Checking if view
            // is within parent bounds
            if(targetX > parentWidth - view.getWidth()) targetX = xBoundMax;
            else if (targetX < 0) targetX = 0;
            if(targetY > parentHeight - view.getHeight())targetY = yBoundMax;
            else if (targetY < 0) targetY = 0;

            // This check is becuase the user may just click on the view
            // So if it's a not a click, animate slowly but fastly
            // to the desired position
            if(firstAnimation)
            {
                firstAnimation = false;
                animate(70, getNewAnimationListener());
                break;
            }

            if(listener != null) break;
            animate(0, null);
            break;

            case MotionEvent.ACTION_BUTTON_PRESS:
        default:
            return false;
    }
    return true;
}

// Gets a new animation listener and reset
private android.animation.Animator.AnimatorListener getNewAnimationListener()
{
    listener =  new Animator.AnimatorListener() {
        @Override public void onAnimationStart(Animator animation) { }
        @Override public void onAnimationCancel(Animator animation) { }
        @Override public void onAnimationRepeat(Animator animation) { }
        @Override public void onAnimationEnd(Animator animation) {
            animation.removeListener(listener);
            listener = null;
            view.setAnimation(null);
            animate(0, null);
        }
    };
    return listener;
}

private void animate(int duration, @Nullable Animator.AnimatorListener listener)
{
    view.animate()
            .x(targetX)
            .y(targetY)
            .setDuration(duration)
            .setListener(listener)
            .start();
    currentX = targetX;
    currentY = targetY;
}

private void click()
{
    // Dohere stuff that you desire and than
}

Jika Anda memiliki wadah di dalam ScrollView atau ScrollView dua dimensi, Anda harus menambahkan baris ini ke onTouch

view.getParent().requestDisallowInterceptTouchEvent(true);

Sama seperti jawaban @ Alex Karshin , saya sedikit berubah.

public class MovingObject implements OnTouchListener {
private RelativeLayout.LayoutParams lParams;
private PointF viewPoint, prePoint, currPoint;

public MovingObject() {
    lParams = null;
    viewPoint = new PointF();
    prePoint = new PointF();
    currPoint = new PointF();
}

public boolean onTouch(View view, MotionEvent event) {
    switch (event.getAction() & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN:
        viewPoint.set(view.getX(), view.getY());
        prePoint.set(event.getRawX(), event.getRawY());
        lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
        break;
    case MotionEvent.ACTION_UP:
        break;
    case MotionEvent.ACTION_POINTER_DOWN:
        break;
    case MotionEvent.ACTION_POINTER_UP:
        break;
    case MotionEvent.ACTION_MOVE:
        currPoint.set(event.getRawX(), event.getRawY());
        moveToCurrentPoint(view);
        break;
    }
    view.invalidate();
    return true;
}

private void moveToCurrentPoint(View view) {
    float dx = currPoint.x - prePoint.x - prePoint.x + viewPoint.x;
    float dy = currPoint.y - prePoint.y - prePoint.y + viewPoint.y;
    lParams.leftMargin = (int) (prePoint.x + dx);
    lParams.topMargin = (int) (prePoint.y + dy);
    view.setLayoutParams(lParams);
}
}