点击放大图像

Question

我有一个活动，该活动以水平滚动视图填充图像，其中有大约4张图片可供用户浏览。 因为单个图像的尺寸很小，所以我希望在单击图像时出现一个美观的弹出窗口，其中显示的图像几乎占据了整个活动，并且图像标题显示在弹出窗口的顶部，并且有一个按钮用于关闭弹出窗口在图片的底部。

如果可能的话，当放大图像时，用户可以在放大图像中向左和向右导航，这与关闭图像然后单击另一个图像只是为了在较大视图中查看相反。

我进行了一些研究，但仍然遇到困难。

以下是显示图像的活动的代码：

public class CasualEventsSingleItemActivity extends Activity {

    // Declare Variables
    String list_item_name;
    String list_item_description;
    String list_item_price;
    String list_item_location;

    String single_list_item_description;




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


        ImageLoader mImageLoader = new ImageLoader(Volley.newRequestQueue(this),
                new ImageLoader.ImageCache() {
            private final LruCache<String, Bitmap>
                    cache = new LruCache<String, Bitmap>(20);

            @Override
            public Bitmap getBitmap(String url) {
                return cache.get(url);
            }

            @Override
            public void putBitmap(String url, Bitmap bitmap) {
                cache.put(url, bitmap);
            }
        });


        Intent i = getIntent();
        list_item_name = i.getStringExtra("list_item_name");
        list_item_location = i.getStringExtra("list_item_location");



        single_list_item_description = i.getStringExtra("single_list_item_description");

        TextView txtname = (TextView) findViewById(R.id.name);
        TextView txtlocation = (TextView) findViewById(R.id.location);
        TextView txtsdescription = (TextView) findViewById(R.id.sdescription);


        NetworkImageView hsvimage1 = (NetworkImageView) findViewById(R.id.hsvimage1);
        NetworkImageView hsvimage2 = (NetworkImageView) findViewById(R.id.hsvimage2);
        NetworkImageView hsvimage3 = (NetworkImageView) findViewById(R.id.hsvimage3);

        // Get image URLs from your previous network request...
        // I could not determine where this is stored from code in your question.
        String url1 = "list_item_bac";   // e.g. http://example.com/images/image1.png
        String url2 = "list_item_bac";
        String url3 = "list_item_bac ";

        // Set the URL of the image that should be loaded into this view, and
        // specify the ImageLoader that will be used to make the request.
        hsvimage1.setImageUrl(url1, mImageLoader);
        hsvimage2.setImageUrl(url2, mImageLoader);
        hsvimage3.setImageUrl(url3, mImageLoader);

        // Set results to the TextViews
        txtname.setText(list_item_name);
        txtlocation.setText(list_item_location);
        txtsdescription.setText(single_list_item_description);


        Button mConfirm2 = (Button)findViewById(R.id.bConfirm2);
        mConfirm2.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                ParseUser currentUser = ParseUser.getCurrentUser();

               // Create the class and the columns
                currentUser.saveInBackground();

                currentUser.put("ActivityName", list_item_name); 
                currentUser.saveInBackground(new SaveCallback() {
                    @Override
                    public void done(ParseException e) {
                        setProgressBarIndeterminateVisibility(false);

                        if (e == null) {
                            // Success!
                            Intent intent = new Intent(CasualEventsSingleItemActivity.this, usermatch.class);
                            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                            startActivity(intent);
                        }
                        else {
                            AlertDialog.Builder builder = new AlertDialog.Builder(CasualEventsSingleItemActivity.this);
                            builder.setMessage(e.getMessage())
                                .setTitle(R.string.signup_error_title)
                                .setPositiveButton(android.R.string.ok, null);
                            AlertDialog dialog = builder.create();
                            dialog.show();
                        }
                   }
               });
                //CasualEventsSingleItemActivity.this.startActivity(new Intent(CasualEventsSingleItemActivity.this, MatchingActivity.class));
            }
        });


    }
}

下面是布局代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
        android:background="@drawable/blue_bac3"
    android:gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
         android:layout_marginTop="10dp"

        android:layout_marginRight="15dp"
        android:alpha="0.9"
        android:paddingBottom="3dp"
        android:shadowColor="#000000"
        android:shadowDx="3"
        android:shadowDy="3"
        android:shadowRadius="0.01"
        android:textColor="#82CAFF"
        android:textSize="24sp" />

    <TextView
        android:id="@+id/location"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/name"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:alpha="0.8"
        android:paddingBottom="5dp"
        android:shadowColor="#000000"
        android:shadowDx="3"
        android:shadowDy="3"
        android:shadowRadius="0.01"
        android:textAlignment="center"
        android:textColor="#f2f2f2"
        android:textSize="16sp" />

    <ImageView
        android:id="@+id/dividertop"
        android:layout_width="370dp"
        android:layout_centerHorizontal="true"
        android:layout_height="wrap_content"
        android:layout_below="@+id/location"
        android:alpha="0.6"
        android:background="@drawable/divider11"
        android:paddingBottom="3dp" />

    <ImageView
        android:id="@+id/dividerbottom"
        android:layout_width="370dp"
                android:layout_centerHorizontal="true"

        android:layout_height="wrap_content"
        android:layout_below="@+id/vsvdescription"
       android:alpha="0.6"
        android:background="@drawable/divider11"
        android:paddingBottom="3dp" />

    <ImageView
        android:id="@+id/image_head"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:background="#000000"
        android:padding="1dp" />

    <HorizontalScrollView
        android:id="@+id/isgallery"
        android:layout_width="370dp"
        android:layout_height="90dp"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/dividerbottom"
        android:layout_marginTop="8dp"
         >

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" >

               <com.android.volley.toolbox.NetworkImageView
                android:id="@+id/hsvimage1"
                android:layout_width="148dp"
                android:layout_height="90dp"
                android:layout_marginRight="6dp"
                android:layout_alignParentRight="true"
                android:background="#fff"
                android:padding="1dp" />
               <com.android.volley.toolbox.NetworkImageView
                android:id="@+id/hsvimage2"
                android:layout_width="148dp"
                android:layout_height="90dp"
                android:layout_marginRight="6dp"
                android:layout_alignParentRight="true"
                android:background="#000000"
                android:padding="1dp" />
               <com.android.volley.toolbox.NetworkImageView
                android:id="@+id/hsvimage3"
                android:layout_width="148dp"
                android:layout_height="90dp"
                android:layout_marginRight="6dp"
                android:layout_alignParentRight="true"
                android:background="#CCC"
                android:padding="1dp" />
               <com.android.volley.toolbox.NetworkImageView
                android:id="@+id/hsvimage4"
                android:layout_width="148dp"
                android:layout_height="90dp"
                android:layout_alignParentRight="true"
                android:background="#000000"
                android:padding="1dp" />
                        </LinearLayout>

                  </HorizontalScrollView>

    <Button
        android:id="@+id/bConfirm2"
        android:layout_width="90dp"
        android:layout_height="50dp"
        android:layout_below="@+id/isgallery"
        android:layout_centerHorizontal="true"
        android:alpha="0.7"
        android:layout_marginTop="10dp"
        android:background="@drawable/gray_bac"
        android:text="Confirm"
        android:textColor="#2B3856"
        android:textStyle="bold" />

     <ScrollView
        android:id="@+id/vsvdescription"
        android:layout_width="370dp"
        android:layout_height="250dp"
        android:layout_marginTop="7dp"
        android:layout_marginBottom="7dp" 
        android:padding="5dp"       

        android:layout_centerHorizontal="true"
        android:layout_below="@+id/dividertop"
         >

            <RelativeLayout
                android:orientation="vertical"
                android:gravity="center"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/sdescription"
        android:layout_width="370dp"
        android:layout_height="250dp"
        android:gravity="center"
        android:alpha="0.65"
        android:textColor="#ffffff"
        android:textSize="18sp" />

    </RelativeLayout>
    </ScrollView>

</RelativeLayout>

预先感谢您，如果您需要任何澄清，请告诉我。

Answer 1

按照此处所述使用GestureImageView

https://github.com/jasonpolites/gesture-imageview/blob/master/main/src/com/polites/android/GestureImageView.java

这将提供缩放功能。 虽然我不确定您要在缩放状态下滚动的其他要求

Answer 2

Volley原始的NetworkImageView无法缩放。

您需要在齐射上添加扩展功能以实现缩放功能。

看看https://github.com/naver/volley-extensions/tree/master/volley-views