如何在触摸事件android上添加移动图像？

Question

这个类有三个按钮添加桌子，添加椅子和重置添加桌子将在第二个布局中添加桌子添加椅子将在第二个布局中添加椅子图像。两个按钮都有效，但我想在屏幕中移动椅子和桌子 (imageView) .

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private ArrayList<String> mSelecetdItems = new ArrayList<>();
    public static final String SELECETD_ITEMS = "SELECETD_ITEMS";

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

    public  void addtable(View v){
        this.mSelecetdItems.add("table");
        showSecondActivity();
    }
    public  void addchair(View v){
        this.mSelecetdItems.add("chair");
        showSecondActivity();
    }

    private void showSecondActivity() {
        Intent i = new Intent(this,Second.class);
        i.putStringArrayListExtra(SELECETD_ITEMS,this.mSelecetdItems);
        startActivity(i);
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        super.onSaveInstanceState(savedInstanceState);
        savedInstanceState.putStringArrayList(SELECETD_ITEMS , mSelecetdItems);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        this.mSelecetdItems = savedInstanceState.getStringArrayList(SELECETD_ITEMS);
    }
}

这个类有三个按钮添加桌子，添加椅子和重置添加桌子将在第二个布局中添加桌子添加椅子将在第二个布局中添加椅子图像。我想在布局图中移动桌椅。

Second.java

public class Second extends AppCompatActivity {

    ImageView iv;
    ImageView iv2;
    private int xDelta;
    private int yDelta;
    LinearLayoutCompat hall;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Toolbar toolbar = (Toolbar) findViewById(R.id.second_toolbar);
        setSupportActionBar(toolbar);
        ActionBar ab = getSupportActionBar();
        ab.setDisplayHomeAsUpEnabled(true);

        hall = (LinearLayoutCompat) findViewById(R.id.hall_layout);
        Intent i = getIntent();

        ArrayList<String> selecetdItems = i.getStringArrayListExtra(MainActivity.SELECETD_ITEMS);
        for (String selecetdItem : selecetdItems) {
            if (selecetdItem.equals("table")) {
                addImageView(R.drawable.table, hall);
            } else if (selecetdItem.equals("chair")) {
                addImageView2(R.drawable.chair2, hall);
            }
        }
    }

    private void addImageView(int imageRes, LinearLayoutCompat hall) {
       iv = new ImageView(this);
        iv.setImageResource(imageRes);
        iv.setLayoutParams(new android.view.ViewGroup.LayoutParams(250, 250));
        iv.setMaxHeight(180);
        iv.setMaxWidth(120);
        iv.setPadding(15,15,0,0);
        hall.addView(iv);
    }

    private void addImageView2(int imageRes, LinearLayoutCompat hall) {
         iv2 = new ImageView(this);
        iv2.setImageResource(imageRes);
        iv2.setLayoutParams(new android.view.ViewGroup.LayoutParams(150, 150));
        iv2.setMaxHeight(30);
        iv2.setMaxWidth(30);

        iv2.setPadding(25,0,0,0);
        hall.addView(iv2);
    }
}

activity_main.xml 这个布局文件在根目录中有ConstraintLayout。

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.andiroot.restaurantbook.MainActivity">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:minHeight="?attr/actionBarSize"
        android:background="#ff1e8622"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
      >
    </android.support.v7.widget.Toolbar>

    <RelativeLayout
        android:layout_width="368dp"
        android:layout_height="495dp"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="64dp">

        <Button
            android:id="@+id/btn_addtbl"
            style="@style/Widget.AppCompat.Button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="76dp"
            android:text="Add Table"
            android:onClick="addtable"/>

        <Button
            android:id="@+id/btn_addchairs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="addchair"
            android:layout_marginTop="27dp"
            android:text="Add Chair"
            android:layout_below="@+id/btn_addtbl"
            android:layout_alignEnd="@+id/btn_addtbl" />

        <Button
            android:id="@+id/btn_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignEnd="@+id/btn_addchairs"
            android:layout_below="@+id/btn_addchairs"
            android:layout_marginTop="51dp"
            android:text="Reset" />
    </RelativeLayout>



</android.support.constraint.ConstraintLayout>

activity_second.xml 这个布局文件在根目录中有LinearLayoutCompat

<?xml version="1.0" encoding="utf-8"?>

<android.support.v7.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/hall_layout"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.andiroot.restaurantbook.Second">

    <android.support.v7.widget.Toolbar
        android:id="@+id/second_toolbar"
        android:minHeight="?attr/actionBarSize"
        android:background="#ff1e8622"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">



    </android.support.v7.widget.Toolbar>
<!--
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/hall_layout2">
    </RelativeLayout>
-->
</android.support.v7.widget.LinearLayoutCompat>


</pre>

Answer 1

试试这个

    ImageView dishaIMG;
    RelativeLayout cropperLayout;
    float dX, dY;
    float windowWidth, windowHeight;

    DisplayMetrics displayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    windowHeight = displayMetrics.heightPixels;
    windowWidth = displayMetrics.widthPixels;

    cropperLayout = (RelativeLayout) findViewById(R.id.activity_main2);

    dishaIMG = (ImageView) findViewById(R.id.img_disha);


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

            int width = dishaIMG.getLayoutParams().width;
            int height = dishaIMG.getLayoutParams().height;

            switch (motionEvent.getAction()) {

                case MotionEvent.ACTION_DOWN:

                    dX = v.getX() - motionEvent.getRawX();
                    dY = v.getY() - motionEvent.getRawY();

                    case MotionEvent.ACTION_MOVE:

                    if (width == windowWidth && height == windowHeight) {


                    } else {
                        v.animate()
                                .x(motionEvent.getRawX() + dX)
                                .y(motionEvent.getRawY() + dY)
                                .setDuration(0)
                                .start();

                        if (motionEvent.getRawX() + dX + width > windowWidth) {
                            v.animate()
                                    .x(windowWidth - width)
                                    .setDuration(0)
                                    .start();
                        }
                        if (motionEvent.getRawX() + dX < 0) {
                            v.animate()
                                    .x(0)
                                    .setDuration(0)
                                    .start();
                        }
                        if (motionEvent.getRawY() + dY + height > windowHeight) {
                            v.animate()
                                    .y(windowHeight - height)
                                    .setDuration(0)
                                    .start();
                        }
                        if (motionEvent.getRawY() + dY < 0) {
                            v.animate()
                                    .y(0)
                                    .setDuration(0)
                                    .start();
                        }

                    }
            }
            return true;
        }
    });