Question

我在主XML中有三个按钮，其中包含添加表格和椅子，重置。当我点击添加表格时，它会在第二个布局中为添加主席添加一个表格。我想在添加后移动两个图像第二种布局就像拖放一样。

包含三个按钮的主要活动。每按一次按钮，它将通过意图传递给second.java

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);
    }


activity_main.xml


<?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>


Second.java



public class Second extends AppCompatActivity {


    @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);

        /*toolbar.setNavigationIcon((R.drawable.back_arrow));

        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed();
            }
        });*/


        LinearLayoutCompat 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) {
        ImageView 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) {
        ImageView 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_second.java


<?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>

Answer 1

您需要在这些图像上实现onTouchListener。

  @Override
public boolean onTouch(View v, MotionEvent event) {
int width=cropperLayout.getLayoutParams().width;;
    int height=cropperLayout.getLayoutParams().height;
    switch (event.getAction()) {

        case MotionEvent.ACTION_DOWN:

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

            return true;

        case MotionEvent.ACTION_MOVE:

            if (width == windowWidth && height == windowHeight){}
            else {
                v.animate()
                        .x(event.getRawX() + dX)
                        .y(event.getRawY() + dY)
                        .setDuration(0)
                        .start();

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

                return true;
            }    
  }
  }

如何在图像android中添加drag n Drop功能？

1 个答案: