android: di chuyển chế độ xem khi di chuyển cảm ứng (ACTION_MOVE)

Tôi muốn thực hiện một điều khiển đơn giản: một container có góc nhìn bên trong. Nếu tôi chạm vào container và tôi di chuyển ngón tay, tôi muốn di chuyển chế độ xem để theo ngón tay của mình.

Những loại container (bố trí) tôi nên sử dụng? làm như thế nào?

Tôi không cần sử dụng bề mặt, nhưng bố cục đơn giản.

Một cái gì đó như thế này:

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;
}}

Trong main.xmlchỉ RelativeLayoutvới@+id/root

Tôi đã tìm thấy một cách tiếp cận dễ dàng để làm điều đó với 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;
}

Theo cách tiếp cận @Andrey, nếu bạn muốn di chuyển chế độ xem từ trung tâm của nó, bạn chỉ phải trừ một nửa chiều cao và chiều rộng của chế độ xem cho chuyển động.

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;
}

Thực hiện tương tự trong 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
 })

Chạm vào container và chế độ xem sẽ theo ngón tay của bạn.

mã 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>

Mã 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;
    }
}

Tôi khuyên bạn nên sử dụng view.translationX và view.translationY để di chuyển quan điểm của bạn.

Đoạn trích Kotlin:

yourView.translationX = xTouchCoordinate
yourView.translationY = yTouchCoordinate

Tạo một lớp trình nghe cảm ứng tùy chỉnh (trong Kotlin):

(Mã này hạn chế chế độ xem của bạn kéo ra khỏi chế độ xem chính)

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
    }
}

Làm thế nào để sử dụng nó?

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

parentView là cha mẹ của quan điểm của bạn.

Trong đoạn mã dưới đây, tôi đã tạo ra một thứ gọi là RegionView( git ), đây là một thùng chứa có thể tái sử dụng chịu trách nhiệm quản lý các hoạt động kéo và thu phóng cho mỗi đứa trẻ lồng nhau của nó.

Ở đây, chúng ta thao tác topvà lefthệ số của một đứa trẻ Viewlà LayoutParamsđể phong trào mô phỏng về biểu đồ. Bằng cách tách rời việc giải thích xử lý những gì được hiểu là hoạt động kéo và những gì được xác định là hoạt động theo quy mô, chúng tôi có thể cung cấp thao tác đáng tin cậy cho trẻ 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;
    }

}

Ở đây tôi chỉ ra một trường hợp sử dụng ví dụ:

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);
    }

}

Đã thay đổi một chút giải pháp được cung cấp bởi @Vyacheslav Shylkin để loại bỏ sự phụ thuộc của bất kỳ số nào được nhập thủ công.

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;
        }
    }
}

Trong ví dụ này, bạn có thể di chuyển chế độ xem trong giới hạn của phụ huynh, bất kể kích thước, hoạt hình hoàn hảo và bắt nhấp chuột.

Lý do giải pháp này vượt trội hơn so với các ý kiến ​​khác là cách tiếp cận này sử dụng Bảng điều hướng tự tính toán và sẽ không chuyển tiếp trên các vị trí Chế độ xem là nguồn gây ra rất nhiều lỗi.

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
}

Nếu bạn có vùng chứa bên trong ScrollView hoặc ScrollView hai chiều, bạn nên thêm dòng này vào onTouch

view.getParent().requestDisallowInterceptTouchEvent(true);

Giống như câu trả lời của @ Alex Karshin , tôi thay đổi một chút.

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);
}
}