以下是我面临的困难：

我可以将图像设置为壁纸成功，但图像不变例如：R.drawable.picture3.But在运行时加载图像转动不同的图像将显示，因此不能给这个恒定的值 R.drawable.picture3。

如何获取显示的运行时图像ID？试图点击＆＃34;设置为壁纸＆＃34;应该设置当前图像作为壁纸。注意：v.getId（）= R.drawable.picture1在这里不起作用都给出了不同的值

以下是我的代码：

             Context context;
         Integer[] imageIDs = {
         R.drawable.picture1,
         R.drawable.picture2,
         R.drawable.picture3,
         R.drawable.picture4,
         R.drawable.picture5,

         }; 

        @Override
         protected void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             setContentView(R.layout.gallery);
             ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
             ImageAdapter adapter = new ImageAdapter(this);
             viewPager.setAdapter(adapter);
             Button button=(Button) findViewById(R.id.button1);
             button.setOnClickListener(new OnClickListener() 
                {

                    @Override
                    public void onClick(View v) {

                         WallpaperManager wallpaperManager = WallpaperManager.getInstance(getApplicationContext());
                         try {
                            wallpaperManager.setResource(R.drawable.picture3);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        Toast.makeText(getApplicationContext(), 
                                "Image is clicked-"+v.getBackground(), Toast.LENGTH_SHORT).show();

                    }
                });        

        }


        public class ImageAdapter extends PagerAdapter{
        Context context;
        int currentPosition;
        private int[] GalImages = new int[] {
                 R.drawable.picture1,
                 R.drawable.picture2,
                 R.drawable.picture3,
                 R.drawable.picture4,
                 R.drawable.picture5,
        };
        ImageAdapter(Context context){
            this.context=context;
        }
        @Override
        public int getCount() {
            return GalImages.length;
        }

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

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ImageView imageView = new ImageView(context);
            int padding = context.getResources().getDimensionPixelSize(R.dimen.abc_action_bar_content_inset_material);
            imageView.setPadding(padding, padding, padding, padding);
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setImageResource(GalImages[position]);
            ((ViewPager) container).addView(imageView, 0);
            return imageView;
        }

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

        <?xml version="1.0" encoding="utf-8"?>
        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" 
        >
                <android.support.v4.view.ViewPager
                    xmlns:android="http://schemas.android.com/apk/res/android"
                    android:id="@+id/pager"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_alignParentTop="true">
                </android.support.v4.view.ViewPager>

                <Button
                    android:id="@+id/button1"
                    android:layout_width="match_parent"
                    android:layout_height="30dp"
                    android:layout_alignParentBottom="true"
                    android:layout_alignParentLeft="true"
                    android:layout_alignParentStart="true"
                    android:background="#cccccc"
                    android:text="@string/set_as_wallpaper" />

        </RelativeLayout>

我不想在图像适配器中的instantiateItem方法中实现此目的。

Answer 1

这很简单。如果我弄错了，那么你想在点击按钮后将图像设置为壁纸。然后这就是逻辑

viewPager.setOnPageChangeListener(new OnPageChangeListener() {

        @Override
        public void onPageSelected(int arg0) {
            // TODO Auto-generated method stub
                    curruntPosition=arg0; //Here you can the position

        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
            // TODO Auto-generated method stub

        }
    });

然后

button.setOnClickListener(new OnClickListener() 
                {

                    @Override
                    public void onClick(View v) {

                         WallpaperManager wallpaperManager = WallpaperManager.getInstance(getApplicationContext());
                         try {
                            wallpaperManager.setResource(imageIDs[curruntPosition]);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        Toast.makeText(getApplicationContext(), 
                                "Image is clicked-"+v.getBackground(), Toast.LENGTH_SHORT).show();

                    }
                });

修改：

如果您想从viewpager

获取当前可见图像

维护一个动态添加的图像列表，如imageList然后

  int currentItem =viewPager.getCurrentItem();
  Drawable drawable = getResource.getDrawable(imageList[currentItem]);
  Bitmap bm =((BitmapDrawable) drawable).getBitmap();

如何获取运行时图像id来设置壁纸

以下是我面临的困难：

1 个答案: