GridView已经被名为“MyDir”的特定文件夹的内容填充。我的布局gallery_fragment被两个linearlayout分成两半。左边的那个有GridView，它已经填充了“MyDir”中的图像。右侧的布局有一个ImageView。
我的想法是，我可以从左侧的GridView中选择一个图像，然后它将出现在右侧的ImageView上。我不能在这个例子中使用res / drawables文件夹。
我被告知我需要使用HashMap hMap; 有人有什么建议吗？
public class GalleryFragment4 extends Fragment {
private ImageView imageView;
private ImageGridViewAdapter imageAdapter;
private GridView gridView;
private static final String GRIDVIEW_TAG = "Android Logo";
@SuppressLint("UseSparseArrays")
public HashMap<Integer, String> hMap = new HashMap<Integer, String>();
// private LinearLayout linear;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_gallery, container,
false);
// assigns gridView to an object
gridView = (GridView) rootView.findViewById(R.id.gridview);
gridArchitecture(rootView);
extractFiles();
/**
* GridView is waiting for an image to be selected
*/
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// image number
int num = (position + 1);
// When image is selected show image number
Toast.makeText(getActivity().getApplicationContext(),
"image : " + num, Toast.LENGTH_SHORT).show();
((Context) getCameraImages(getActivity())).getApplicationContext();
try{
imageView.setImageResource(position);
}catch(NullPointerException ex){
}
}
});
return rootView;
}
/*
* Save image to external SD card and create new file if said file is not
* already created
*/
public static final String DIRECTORY_PATH = Environment
.getExternalStorageDirectory().toString() + "/MyDir/";
// public static final String CAMER_IMAGE_BUCKET_ID = getBucketId(DIRECTORY_PATH);
/**
* Matches code in MediaProvider.computeBucketValues. Should be a common
* function.
*/
// public static String getBucketId(String path) {
// return String.valueOf(path.toLowerCase().hashCode());
// }
/**
* Retrieve all camera images
*
* @param context
* @return
*/
public static List<String> getCameraImages(Context context) {
final String[] projection = { MediaStore.Images.Media.DATA };
final String selection = MediaStore.Images.Media.BUCKET_ID + " = ?";
final String[] selectionArgs = { DIRECTORY_PATH };
final Cursor cursor = context.getContentResolver().query(
Images.Media.EXTERNAL_CONTENT_URI, projection, selection,
selectionArgs, null);
ArrayList<String> result = new ArrayList<String>(cursor.getCount());
if (cursor.moveToFirst()) {
final int dataColumn = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
do {
final String data = cursor.getString(dataColumn);
result.add(data);
} while (cursor.moveToNext());
}
cursor.close();
return result;
}
private void extractFiles() {
// Name of the folder
final String targetPath = DIRECTORY_PATH;
// Toast showing name of directory which images are saved to.
Toast.makeText(getActivity().getApplicationContext(), targetPath,
Toast.LENGTH_LONG).show();
File targetDirector = new File(targetPath);
final File[] files = targetDirector.listFiles();
for (File file : files) {
imageAdapter.add(file.getAbsolutePath());
}
}
private void gridArchitecture(View rootView) {
// Sets the Tag
gridView.setTag(GRIDVIEW_TAG);
/*
* Adapt the image for the GridView format
*/
imageAdapter = new ImageGridViewAdapter(getActivity()
.getApplicationContext());
gridView.setAdapter(imageAdapter);
// Set the orientation to landscape
getActivity().setRequestedOrientation(
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
}
如果有任何用处，请使用ImageGridviewAdapter.java
public class ImageGridViewAdapter extends BaseAdapter {
private Context context;
ArrayList<String> imageList = new ArrayList<String>();
public ImageGridViewAdapter(Context c) {
context = c;
}
void add(String path){
imageList.add(path);
}
@Override
public int getCount() {
return imageList.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
//8,8,8,8
imageView.setPadding(20, 20, 20, 20);
} else {
imageView = (ImageView) convertView;
}
// 200, 200
Bitmap bm = decodeSampledBitmapFromUri(imageList.get(position), 100, 100);
imageView.setImageBitmap(bm);
return imageView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
Bitmap bm = null;
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
}
这是xml fragment_gallery.xml
<?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:id="@+id/top"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/darkblue"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/center_point"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_centerInParent="true"
android:orientation="horizontal" />
<LinearLayout
android:id="@+id/right_linear"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/center_point"
android:background="@drawable/normal_shape" >
<ImageView
android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginBottom="320dp"
android:contentDescription="@drawable/android_icon"
android:src="@drawable/android_icon" />
</LinearLayout>
<LinearLayout
android:id="@+id/left_linear"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/center_point" >
<GridView
android:id="@+id/gridview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnWidth="50dp"
android:gravity="center"
android:horizontalSpacing="10dip"
android:numColumns="2"
android:stretchMode="columnWidth"
android:verticalSpacing="10dip" >
</GridView>
</LinearLayout>
</RelativeLayout>
答案 0 :(得分：0)
请检查我已更改您的文件外观并比较并相应地进行更改 的 1）.GalleryFragment4.java
public class GalleryFragment4 extends Fragment {
private ImageView imageView;
private ImageGridViewAdapter imageAdapter;
private GridView gridView;
private static final String GRIDVIEW_TAG = "Android Logo";
// Change is here
ArrayList<String> imageList = new ArrayList<String>();
@SuppressLint("UseSparseArrays")
public HashMap<Integer, String> hMap = new HashMap<Integer, String>();
// private LinearLayout linear;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_gallery, container,
false);
// assigns gridView to an object
gridView = (GridView) rootView.findViewById(R.id.gridview);
imageview = (ImageView) rootview.findviewById(//Place_id);
gridArchitecture(rootView);
extractFiles();
/**
* GridView is waiting for an image to be selected
*/
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// image number
//int num = (position + 1);
// When image is selected show image number
//Toast.makeText(getActivity().getApplicationContext(),
// "image : " + num, Toast.LENGTH_SHORT).show();
Bitmap bm = decodeSampledBitmapFromUri(imageList.get(position), 100, 100);
imageView.setImageBitmap(bm);
});
return rootView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
Bitmap bm = null;
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
/*
* Save image to external SD card and create new file if said file is not
* already created
*/
public static final String DIRECTORY_PATH = Environment
.getExternalStorageDirectory().toString() + "/MyDir/";
// public static final String CAMER_IMAGE_BUCKET_ID = getBucketId(DIRECTORY_PATH);
/**
* Matches code in MediaProvider.computeBucketValues. Should be a common
* function.
*/
// public static String getBucketId(String path) {
// return String.valueOf(path.toLowerCase().hashCode());
// }
/**
* Retrieve all camera images
*
* @param context
* @return
*/
public static List<String> getCameraImages(Context context) {
final String[] projection = { MediaStore.Images.Media.DATA };
final String selection = MediaStore.Images.Media.BUCKET_ID + " = ?";
final String[] selectionArgs = { DIRECTORY_PATH };
final Cursor cursor = context.getContentResolver().query(
Images.Media.EXTERNAL_CONTENT_URI, projection, selection,
selectionArgs, null);
ArrayList<String> result = new ArrayList<String>(cursor.getCount());
if (cursor.moveToFirst()) {
final int dataColumn = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
do {
final String data = cursor.getString(dataColumn);
result.add(data);
} while (cursor.moveToNext());
}
cursor.close();
return result;
}
private void extractFiles() {
// Name of the folder
final String targetPath = DIRECTORY_PATH;
// Toast showing name of directory which images are saved to.
Toast.makeText(getActivity().getApplicationContext(), targetPath,
Toast.LENGTH_LONG).show();
File targetDirector = new File(targetPath);
final File[] files = targetDirector.listFiles();
for (File file : files) {
//change is here
imageList.add(file.getAbsolutePath());
}
}
private void gridArchitecture(View rootView) {
// Sets the Tag
gridView.setTag(GRIDVIEW_TAG);
/*
* Adapt the image for the GridView format
*/
// change is here.
imageAdapter = new ImageGridViewAdapter(getActivity()
.getApplicationContext(),imageList);
gridView.setAdapter(imageAdapter);
// Set the orientation to landscape
getActivity().setRequestedOrientation(
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
}
<强> 2.ImageGridviewAdapter.java
public class ImageGridViewAdapter extends BaseAdapter {
private Context context;
ArrayList<String> imageList = new ArrayList<String>();
public ImageGridViewAdapter(Context c,ArrayList<String> imageLists) {
context = c;
imageList = imageLists;
}
//Change is here
// void add(String path){
// imageList.add(path);
// }
@Override
public int getCount() {
return imageList.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
//8,8,8,8
imageView.setPadding(20, 20, 20, 20);
} else {
imageView = (ImageView) convertView;
}
// 200, 200
Bitmap bm = decodeSampledBitmapFromUri(imageList.get(position), 100, 100);
imageView.setImageBitmap(bm);
return imageView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
Bitmap bm = null;
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
}
我已经写了我做出改变的地方 如果仍然发现任何错误，则发表评论
答案 1 :(得分：0)
假设您的目标ImageView被声明为：
private ImageView targetImageView;
您需要做的就是将听众如下所示注册到gridView：
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// You know that the convertView returned from your adapter's
// getView method is ImageView so you can cast it here accordingly.
targetImageView.setImageDrawable(((ImageView) view).getDrawable());
}
});