Android

Question

在我的应用程序中，我能够从服务器（使用 volley 库）加载所有图像并在网格视图中显示。

查看网格视图：

但是当我从图库中单击特定项目（图片）时，它无法以完整视图显示，但一切正常，例如缩放、捏合和滑动等。

FullScreenImageAdapter.java:

    import android.app.Activity;
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.support.v4.view.PagerAdapter;
    import android.support.v4.view.ViewPager;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.Button;
    import android.widget.RelativeLayout;

    import com.android.volley.toolbox.ImageLoader;


    public class FullScreenImageAdapter extends PagerAdapter {

        private Activity _activity;
        private ArrayList<String> _imagePaths;
        private LayoutInflater inflater;

        // constructor
        public FullScreenImageAdapter(Activity activity, ArrayList<String> imagePaths) {
            this._activity = activity;
            this._imagePaths = imagePaths;
        }

        @Override
        public int getCount() {
            return this._imagePaths.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == ((RelativeLayout) object);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            TouchImageView imgDisplay;
            Button btnClose;

            inflater = (LayoutInflater) _activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image, container, false);

            imgDisplay = (TouchImageView) viewLayout.findViewById(R.id.imgDisplay);
            btnClose = (Button) viewLayout.findViewById(R.id.btnClose);

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inPreferredConfig = Bitmap.Config.ARGB_8888;
            options.inJustDecodeBounds = true;
            options.inSampleSize = 4;

            // Bitmap bitmap = BitmapFactory.decodeFile(_imagePaths.get(position),
            // options);
            // imgDisplay.setImageBitmap(bitmap);

            // Loading image with placeholder and error image
            ImageLoader imageLoader = AppController.getInstance().getImageLoader();
            String path = _imagePaths.get(position);
            imageLoader.get(path, ImageLoader.getImageListener(imgDisplay, R.drawable.ic_launcher, R.drawable.logo_final));

            // close button click event
            btnClose.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    _activity.finish();
                }
            });

            ((ViewPager) container).addView(viewLayout);

            return viewLayout;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            ((ViewPager) container).removeView((RelativeLayout) object);

        }

    }

FullScreenViewActivity.java:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;

public class FullScreenViewActivity extends Activity {

    // private Utils utils;
    private FullScreenImageAdapter adapter;
    private ViewPager viewPager;

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

        viewPager = (ViewPager) findViewById(R.id.pager);

        // utils = new Utils(getApplicationContext());

        Intent i = getIntent();
        int position = i.getIntExtra("position", 0);
        ArrayList<String> imagePaths = i.getExtras().getStringArrayList("imagePaths");

        adapter = new FullScreenImageAdapter(FullScreenViewActivity.this, imagePaths);

        viewPager.setAdapter(adapter);

        // displaying selected image first
        viewPager.setCurrentItem(position);
    }
}

activity_fullscreen_view.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <com.example.test.adapter.ExtendedViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

layout_fullscreen_image.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <com.example.test.util.TouchImageView
        android:id="@+id/imgDisplay"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:adjustViewBounds="true"
        android:scaleType="fitXY"
        android:src="@drawable/splash_screen_final" />

    <Button
        android:id="@+id/btnClose"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:background="@drawable/button_background"
        android:paddingBottom="2dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:paddingTop="2dp"
        android:text="@string/close"
        android:textColor="#ffffff" />

</RelativeLayout>

ExtendedViewPager.java:

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;


public class ExtendedViewPager extends ViewPager {

    public ExtendedViewPager(Context context) {
        super(context);
    }

    public ExtendedViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected boolean canScroll(View v, boolean checkV, int dx, int x, int y) {
        if (v instanceof TouchImageView) {
            //
            // canScrollHorizontally is not supported for Api < 14. To get around this issue,
            // ViewPager is extended and canScrollHorizontallyFroyo, a wrapper around
            // canScrollHorizontally supporting Api >= 8, is called.
            //
            return ((TouchImageView) v).canScrollHorizontallyFroyo(-dx);

        } else {
            return super.canScroll(v, checkV, dx, x, y);
        }
    }

}

触摸图像视图：

如有任何建议，我们将不胜感激..在此先感谢..

Answer 1

这里的问题是 URL 编码终于找到了解决方案。

我刚刚在将 imagePaths 发送到 FullScreenViewActivity 之前添加了这一行以使其工作。

imagePathsString.add(uri.toString());

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