我想在用户选择gridview项目时更改gridview项目的背景颜色？所以用户明白他/她选择的图像请帮助我...谢谢你的进步
public class Gallery extends Activity implements
OnItemClickListener {
private GridView sdcardImages;
ArrayList<String> IPath = new ArrayList<String>();
String imagePath;
private ImageAdapter imageAdapter;
GridView grid = sdcardImages;
private Display display;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try{
// Request progress bar
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.gallery);
Button selpic = (Button) findViewById(R.id.gallery);
display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
setupViews();
setProgressBarIndeterminateVisibility(true);
loadImages();
/* sdcardImages.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
try{
//sdcardImages.setBackground(position);
int columnIndex = 0;
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection,
null,
null,
null);
if (cursor != null) {
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToPosition(position);
imagePath = cursor.getString(columnIndex);
}
if(IPath.contains(imagePath))
{
Toast.makeText(getApplicationContext(),"Removed",Toast.LENGTH_SHORT).show();
IPath.remove(imagePath);
Toast.makeText(getApplicationContext(),IPath.toString(),Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(),"Selected",Toast.LENGTH_SHORT).show();
IPath.add(imagePath);
Toast.makeText(getApplicationContext(),IPath.toString(),Toast.LENGTH_SHORT).show();
}
}
catch (Exception e)
{
Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
//Toast.makeText(MainActivity.this, "LONG PRESS", Toast.LENGTH_SHORT).show();
//set the image as wallpaper
return true;
}
});*/
selpic.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try{
Intent intentMessage = new Intent(Gallery.this,
GalleryUpload.class);
intentMessage.putStringArrayListExtra("IMAGE", IPath);
startActivity(intentMessage);
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
});
}
catch (Exception e)
{
e.printStackTrace();
Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
/**
* Free up bitmap related resources.
*/
protected void onDestroy() {
super.onDestroy();
final int count = grid.getChildCount();
ImageView v = null;
for (int i = 0; i < count; i++) {
v = (ImageView) grid.getChildAt(i);
((BitmapDrawable) v.getDrawable()).setCallback(null);
}
}
/**
* Setup the grid view.
*/
private void setupViews() {
sdcardImages = (GridView) findViewById(R.id.sdcard);
// sdcardImages.setNumColumns(display.getWidth()/95);
sdcardImages.setChoiceMode(2);
sdcardImages.setClipToPadding(false);
sdcardImages.setOnItemClickListener(Gallery.this);
imageAdapter = new ImageAdapter(getApplicationContext());
sdcardImages.setAdapter(imageAdapter);
}
/**
* Load images.
*/
private void loadImages() {
final Object data = getLastNonConfigurationInstance();
if (data == null) {
new LoadImagesFromSDCard().execute();
} else {
final LoadedImage[] photos = (LoadedImage[]) data;
if (photos.length == 0) {
new LoadImagesFromSDCard().execute();
}
for (LoadedImage photo : photos) {
addImage(photo);
}
}
}
/**
* Add image(s) to the grid view adapter.
*
* @param value Array of LoadedImages references
*/
private void addImage(LoadedImage... value) {
for (LoadedImage image : value) {
imageAdapter.addPhoto(image);
imageAdapter.notifyDataSetChanged();
}
}
/**
* Save bitmap images into a list and return that list.
*
* @see android.app.Activity#onRetainNonConfigurationInstance()
*/
@Override
public Object onRetainNonConfigurationInstance() {
final GridView grid = sdcardImages;
final int count = grid.getChildCount();
final LoadedImage[] list = new LoadedImage[count];
for (int i = 0; i < count; i++) {
final ImageView v = (ImageView) grid.getChildAt(i);
list[i] = new LoadedImage(((BitmapDrawable) v.getDrawable()).getBitmap());
}
return list;
}
/**
* Async task for loading the images from the SD card.
*
* @author Mihai Fonoage
*
*/
class LoadImagesFromSDCard extends AsyncTask<Object, LoadedImage, Object> {
/**
* Load images from SD Card in the background, and display each image on the screen.
*
* @see android.os.AsyncTask#
* doInBackground(Params[])
*/
@Override
protected Object doInBackground(Object... params) {
//setProgressBarIndeterminateVisibility(true);
Bitmap bitmap = null;
Bitmap newBitmap = null;
Uri uri = null;
// Set up an array of the Thumbnail Image ID column we want
String[] projection = {MediaStore.Images.Thumbnails._ID};
// Create the cursor pointing to the SDCard
Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
null);
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
int size = cursor.getCount();
// If size is 0, there are no images on the SD Card.
if (size == 0) {
//No Images available, post some message to the user
}
int imageID = 0;
for (int i = 0; i < size; i++) {
cursor.moveToPosition(i);
imageID = cursor.getInt(columnIndex);
uri = Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" + imageID);
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
if (bitmap != null) {
newBitmap = Bitmap.createScaledBitmap(bitmap, 150,150, true);
bitmap.recycle();
if (newBitmap != null) {
publishProgress(new LoadedImage(newBitmap));
}
}
} catch (IOException e) {
//Error fetching image, try to recover
}
}
cursor.close();
return null;
}
/**
* Add a new LoadedImage in the images grid.
*
* @param value The image.
*/
@Override
public void onProgressUpdate(LoadedImage... value) {
addImage(value);
}
/**
* Set the visibility of the progress bar to false.
*
* @see android.os.AsyncTask#onPostExecute(Object)
*/
@Override
protected void onPostExecute(Object result) {
setProgressBarIndeterminateVisibility(false);
}
}
/**
* Adapter for our image files.
* @author Mihai Fonoage
*/
class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<LoadedImage> photos = new ArrayList<LoadedImage>();
public ImageAdapter(Context context) {
mContext = context;
}
public void addPhoto(LoadedImage photo) {
photos.add(photo);
}
public int getCount() {
return photos.size();
}
public Object getItem(int position) {
return photos.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
final ImageView imageView;
if (convertView == null) {
imageView = new ImageView(mContext);
} else {
imageView = (ImageView) convertView;
}
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setPadding(1, 1, 1, 1);
imageView.setImageBitmap(photos.get(position).getBitmap());
return imageView;
}
}
/**
* A LoadedImage contains the Bitmap loaded for the image.
*/
private static class LoadedImage {
Bitmap mBitmap;
LoadedImage(Bitmap bitmap) {
mBitmap = bitmap;
}
public Bitmap getBitmap() {
return mBitmap;
}
}
/**
* When an image is clicked, load that image as a puzzle.
*/
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
try{
//sdcardImages.setBackground(position);
int columnIndex = 0;
String[] projection = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection,
null,
null,
null);
if (cursor != null) {
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToPosition(position);
imagePath = cursor.getString(columnIndex);
}
if(IPath.contains(imagePath))
{
Toast.makeText(getApplicationContext(),"Removed",Toast.LENGTH_SHORT).show();
IPath.remove(imagePath);
//Toast.makeText(getApplicationContext(),IPath.toString(),Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(),"Selected",Toast.LENGTH_SHORT).show();
IPath.add(imagePath);
//Toast.makeText(getApplicationContext(),IPath.toString(),Toast.LENGTH_SHORT).show();
}
}
catch (Exception e)
{
Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
@Override
protected void finalize() throws Throwable {
super.finalize();
System.gc();
}
}
gallery.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/insidepage1"
android:weightSum="1">
<GridView
android:id="@+id/sdcard"
android:layout_width="fill_parent"
android:layout_height="438dp"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:numColumns="2"
android:choiceMode="multipleChoice"
android:listSelector="@drawable/grid_selector"
android:layout_weight="1.22" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Selected Images"
android:layout_marginTop="5dp"
android:id="@+id/gallery" />
</LinearLayout>
grid_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/pressedback" />
<item android:state_focused="true" android:drawable="@drawable/pressedback" />
<item android:state_selected="true" android:drawable="@drawable/pressedback" />
<item android:state_checked="true" android:drawable="@drawable/pressedback" />
<item android:state_activated="true" android:drawable="@drawable/pressedback" />
<item android:state_active="true" android:drawable="@drawable/pressedback" />
<item android:state_long_pressable="true" android:drawable="@drawable/pressedback" />
</selector>
答案 0 :(得分：0)
在这里，您将图像视图添加为动态右侧。更好地需要为gridview适配器创建另一个布局并对该布局进行充气，然后您将轻松地轻松更改该gridview单元格背景。在该布局中，您将采用线性布局创建一个图像-view，为该图像设置所有margens 10dp-view。这里图像视图有四个边你有间隙。那么你将setBackground基于位置的线性布局。
** <LinearLayout
android:id="@+id/front"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp"
android:background="@color/white"
android:orientation="vertical"
android:paddingBottom="2dp" >
<ImageView
android:id="@+id/profileImage"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:layout_marginBottom="10dp
android:contentDescription="@string/app_name"
/>
</ImageView>
</LinearLayout>**
I Hope it will help to you...
答案 1 :(得分：0)
public class SearchProfileGridAdapter extends BaseAdapter {
private Context context;
private LayoutInflater inflator;
private ArrayList<String> descriptionContent;
public static boolean btnDoubleClickGridFlag = false;
public SearchProfileGridAdapter(Context context,ArrayList<String> descriptionContent,String from) {
this.context = context;
inflator = LayoutInflater.from(context);
this.from=from;
listener=this;
}
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
String des="";
if (convertView == null) {
convertView = inflator.inflate(R.layout.grid_item,parent,false);
holder = new ViewHolder();
holder.person_shortlist=(ImageView)convertView.findViewById(R.id.person_shortlist);
convertView.setTag(holder);
}else
{
holder = (ViewHolder) convertView.getTag();
}
holder.person_shortlist.setBackGround()//TODO
}
private static class ViewHolder {
private ImageView person_shortlist;
}