Question

我计划开发一个Android应用程序，客户可以在其中更改应用程序背景并将其个人图像或照片设置为背景。但是这意味着图像不会出现在＆＃34; drawables＆＃34;，我对Android很新，我一直在寻找这个，请问任何人请帮助我。

Answer 1

试试这个......

    public class GalleryAdapter extends Activity {
        private int count;
        private Bitmap[] thumbnails;
        private boolean[] thumbnailsselection;
        private String[] arrPath;
        private ImageAdapter imageAdapter;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.image_selector);
            final String[] columns = { MediaStore.Images.Media.DATA,MediaStore.Images.Media._ID };
            final String orderBy = MediaStore.Images.Media._ID;
            Cursor imagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null,null,orderBy);
            int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
            this.count = imagecursor.getCount();
            this.thumbnails = new Bitmap[this.count];
            this.arrPath = new String[this.count];
            this.thumbnailsselection = new boolean[this.count];

            for (int i = 0; i < this.count; i++) {
                imagecursor.moveToPosition(i);
                int id = imagecursor.getInt(image_column_index);
                int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
                thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
                getApplicationContext().getContentResolver(), id,
                MediaStore.Images.Thumbnails.MICRO_KIND, null);
                arrPath[i] = imagecursor.getString(dataColumnIndex);
            }

            GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
            imageAdapter = new ImageAdapter();
            imagegrid.setAdapter(imageAdapter);
            imagecursor.close();
            final Button selectBtn = (Button) findViewById(R.id.selectBtn);
            selectBtn.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    final int len = thumbnailsselection.length;
                    int cnt = 0;
                    String selectImages = "";
                    for (int i = 0; i < len; i++){
                        if (thumbnailsselection[i]) {
                            cnt++;
                            selectImages = selectImages + arrPath[i] + "|";
                        }
                    }

                    if (cnt == 0) {
                        Toast.makeText(getApplicationContext(), "Please select at least one image", Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(getApplicationContext(), "You've selected Total " + cnt + " image(s).",Toast.LENGTH_LONG).show();
                        Log.d("SelectedImages", selectImages);
                    }
                }
            });
        }

        public class ImageAdapter extends BaseAdapter {
            private LayoutInflater mInflater;
            public ImageAdapter() {
                mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            }

            public int getCount() {
                return count;
            }
            public Object getItem(int position) {
                return position;
            }
            public long getItemId(int position) {
                return position;
            }
            public View getView(int position, View convertView, ViewGroup parent) {
                ViewHolder holder;
                if (convertView == null) {
                    holder = new ViewHolder();
                    convertView = mInflater.inflate(R.layout.gallery_item,null);
                    holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
                    holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);
                    convertView.setTag(holder);

                } else {
                    holder = (ViewHolder) convertView.getTag();
                }
                holder.checkbox.setId(position);
                holder.imageview.setId(position);
                holder.checkbox.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        CheckBox cb = (CheckBox) v;
                        int id = cb.getId();
                        if (thumbnailsselection[id]) {
                            cb.setChecked(false);
                            thumbnailsselection[id] = false;
                        } else {
                            cb.setChecked(true);
                            thumbnailsselection[id] = true;
                        }
                    }
                });
                holder.imageview.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        int id = v.getId();
                        Intent intent = new Intent();
                        intent.setAction(Intent.ACTION_VIEW);
                        intent.setDataAndType(Uri.parse("file://" + arrPath[id]),"image/*");
                        startActivity(intent);
                    }
                });
                holder.imageview.setImageBitmap(thumbnails[position]);
                holder.checkbox.setChecked(thumbnailsselection[position]);
                holder.id = position;
                return convertView;
            }
        }
        class ViewHolder {
            ImageView imageview;
            CheckBox checkbox;
            int id;
        }

}

image_selector.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="fill_parent">
    <Button android:id="@+id/selectBtn" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:text="Select"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" 
        android:minWidth="200px" />
    <GridView android:id="@+id/PhoneImageGrid"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:numColumns="auto_fit" 
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp" 
        android:columnWidth="90dp"
        android:stretchMode="columnWidth" 
        android:gravity="center"
        android:layout_above="@id/selectBtn" />
</RelativeLayout>

gallery_item.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="fill_parent">
    <ImageView android:id="@+id/thumbImage" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_centerInParent="true" />
    <CheckBox android:id="@+id/itemCheckBox" 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" 
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true" />
</RelativeLayout>

动态设置Android应用程序的自定义背景

1 个答案: