Java SD卡上图像的ViewPager不工作
我是android应用程序开发的新手,我将按照本教程创建一个图像库。 .Java SD卡上图像的ViewPager不工作,java,android,android-viewpager,android-imageview,image-gallery,Java,Android,Android Viewpager,Android Imageview,Image Gallery,我是android应用程序开发的新手,我将按照本教程创建一个图像库。 . 它工作得很好,但现在我想在ViewPager中显示图像,以便能够通过向左/向右滑动来显示图像。我正在使用适配器来执行此操作。 我已经试过了,但它不起作用,我不知道为什么。我不能刷图像。有人能帮我吗?我是否为图像使用了正确的路径 此项目可在github上访问: ImageGallery.java: public class ImageGallery extends AppCompatActivity { publi
它工作得很好,但现在我想在
ViewPager
中显示图像,以便能够通过向左/向右滑动来显示图像。我正在使用适配器来执行此操作。
我已经试过了,但它不起作用,我不知道为什么。我不能刷图像。有人能帮我吗?我是否为图像使用了正确的路径
此项目可在github上访问:ImageGallery.java:
public class ImageGallery extends AppCompatActivity {
public static ArrayList<Model_images> al_images = new ArrayList<>();
boolean boolean_folder;
Adapter_PhotosFolder obj_adapter;
GridView gv_folder;
private static final int REQUEST_PERMISSIONS = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gv_folder = (GridView)findViewById(R.id.gv_folder);
gv_folder.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), PhotosActivity.class);
intent.putExtra("value",i);
startActivity(intent);
}
});
if ((ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
if ((ActivityCompat.shouldShowRequestPermissionRationale(ImageGallery.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) && (ActivityCompat.shouldShowRequestPermissionRationale( ImageGallery.this,
Manifest.permission.READ_EXTERNAL_STORAGE))) {
} else {
ActivityCompat.requestPermissions( ImageGallery.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSIONS);
}
}else {
Log.e("Else","Else");
fn_imagespath();
}
}
public ArrayList<Model_images> fn_imagespath() {
al_images.clear();
int int_position = 0;
Uri uri;
Cursor cursor;
int column_index_data, column_index_folder_name;
String absolutePathOfImage;
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = {MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
final String orderBy = MediaStore.Images.Media.DATE_TAKEN;
cursor = getApplicationContext().getContentResolver().query(uri, projection, null, null, orderBy + " DESC");
column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
column_index_folder_name = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
while (cursor.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data);
Log.e("Column", absolutePathOfImage);
Log.e("Folder", cursor.getString(column_index_folder_name));
for (int i = 0; i < al_images.size(); i++) {
if (al_images.get(i).getStr_folder().equals(cursor.getString(column_index_folder_name))) {
boolean_folder = true;
int_position = i;
break;
} else {
boolean_folder = false;
}
}
if (boolean_folder) {
ArrayList<String> al_path = new ArrayList<>();
al_path.addAll(al_images.get(int_position).getAl_imagepath());
al_path.add(absolutePathOfImage);
al_images.get(int_position).setAl_imagepath(al_path);
} else {
ArrayList<String> al_path = new ArrayList<>();
al_path.add(absolutePathOfImage);
Model_images obj_model = new Model_images();
obj_model.setStr_folder(cursor.getString(column_index_folder_name));
obj_model.setAl_imagepath(al_path);
al_images.add(obj_model);
}
}
for (int i = 0; i < al_images.size(); i++) {
Log.e("FOLDER", al_images.get(i).getStr_folder());
for (int j = 0; j < al_images.get(i).getAl_imagepath().size(); j++) {
Log.e("FILE", al_images.get(i).getAl_imagepath().get(j));
}
}
obj_adapter = new Adapter_PhotosFolder(getApplicationContext(),al_images);
gv_folder.setAdapter(obj_adapter);
return al_images;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_PERMISSIONS: {
for (int i = 0; i < grantResults.length; i++) {
if (grantResults.length > 0 && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
fn_imagespath();
} else {
Toast.makeText(ImageGallery.this, "The app was not allowed to read or write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
}
}
}
}
}
}
public class PhotosActivity extends AppCompatActivity {
int int_position;
private GridView gridView;
GridViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gridView = (GridView)findViewById(R.id.gv_folder);
int_position = getIntent().getIntExtra("value", 0);
adapter = new GridViewAdapter(this, al_images,int_position);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String abc = "file://" + al_images.get(int_position).getAl_imagepath().get(position);
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
i.putExtra("id", position);
i.putExtra("abc",abc);
startActivity(i);
}
});
}
}
public class Adapter_PhotosFolder extends ArrayAdapter<Model_images> {
Context context;
ViewHolder viewHolder;
ArrayList<Model_images> al_menu = new ArrayList<>();
public Adapter_PhotosFolder(Context context, ArrayList<Model_images> al_menu) {
super(context, R.layout.activity_adapter__photos_folder, al_menu);
this.al_menu = al_menu;
this.context = context;
}
@Override
public int getCount() {
Log.e("ADAPTER LIST SIZE", al_menu.size() + "");
return al_menu.size();
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public int getViewTypeCount() {
if (al_menu.size() > 0) {
return al_menu.size();
} else {
return 1;
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_adapter__photos_folder, parent, false);
viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tv_foldern.setText(al_menu.get(position).getStr_folder());
viewHolder.tv_foldersize.setText(al_menu.get(position).getAl_imagepath().size()+"");
Glide.with(context).load("file://" + al_menu.get(position).getAl_imagepath().get(0))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(viewHolder.iv_image);
return convertView;
}
private static class ViewHolder {
TextView tv_foldern, tv_foldersize;
ImageView iv_image;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/jazzy_pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/fullImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="centerCrop"
/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
活动\u full\u image.xml:
public class ImageGallery extends AppCompatActivity {
public static ArrayList<Model_images> al_images = new ArrayList<>();
boolean boolean_folder;
Adapter_PhotosFolder obj_adapter;
GridView gv_folder;
private static final int REQUEST_PERMISSIONS = 100;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gv_folder = (GridView)findViewById(R.id.gv_folder);
gv_folder.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Intent intent = new Intent(getApplicationContext(), PhotosActivity.class);
intent.putExtra("value",i);
startActivity(intent);
}
});
if ((ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(getApplicationContext(),
Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
if ((ActivityCompat.shouldShowRequestPermissionRationale(ImageGallery.this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) && (ActivityCompat.shouldShowRequestPermissionRationale( ImageGallery.this,
Manifest.permission.READ_EXTERNAL_STORAGE))) {
} else {
ActivityCompat.requestPermissions( ImageGallery.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
REQUEST_PERMISSIONS);
}
}else {
Log.e("Else","Else");
fn_imagespath();
}
}
public ArrayList<Model_images> fn_imagespath() {
al_images.clear();
int int_position = 0;
Uri uri;
Cursor cursor;
int column_index_data, column_index_folder_name;
String absolutePathOfImage;
uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = {MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
final String orderBy = MediaStore.Images.Media.DATE_TAKEN;
cursor = getApplicationContext().getContentResolver().query(uri, projection, null, null, orderBy + " DESC");
column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
column_index_folder_name = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
while (cursor.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data);
Log.e("Column", absolutePathOfImage);
Log.e("Folder", cursor.getString(column_index_folder_name));
for (int i = 0; i < al_images.size(); i++) {
if (al_images.get(i).getStr_folder().equals(cursor.getString(column_index_folder_name))) {
boolean_folder = true;
int_position = i;
break;
} else {
boolean_folder = false;
}
}
if (boolean_folder) {
ArrayList<String> al_path = new ArrayList<>();
al_path.addAll(al_images.get(int_position).getAl_imagepath());
al_path.add(absolutePathOfImage);
al_images.get(int_position).setAl_imagepath(al_path);
} else {
ArrayList<String> al_path = new ArrayList<>();
al_path.add(absolutePathOfImage);
Model_images obj_model = new Model_images();
obj_model.setStr_folder(cursor.getString(column_index_folder_name));
obj_model.setAl_imagepath(al_path);
al_images.add(obj_model);
}
}
for (int i = 0; i < al_images.size(); i++) {
Log.e("FOLDER", al_images.get(i).getStr_folder());
for (int j = 0; j < al_images.get(i).getAl_imagepath().size(); j++) {
Log.e("FILE", al_images.get(i).getAl_imagepath().get(j));
}
}
obj_adapter = new Adapter_PhotosFolder(getApplicationContext(),al_images);
gv_folder.setAdapter(obj_adapter);
return al_images;
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_PERMISSIONS: {
for (int i = 0; i < grantResults.length; i++) {
if (grantResults.length > 0 && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
fn_imagespath();
} else {
Toast.makeText(ImageGallery.this, "The app was not allowed to read or write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
}
}
}
}
}
}
public class PhotosActivity extends AppCompatActivity {
int int_position;
private GridView gridView;
GridViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_gallery);
gridView = (GridView)findViewById(R.id.gv_folder);
int_position = getIntent().getIntExtra("value", 0);
adapter = new GridViewAdapter(this, al_images,int_position);
gridView.setAdapter(adapter);
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String abc = "file://" + al_images.get(int_position).getAl_imagepath().get(position);
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
i.putExtra("id", position);
i.putExtra("abc",abc);
startActivity(i);
}
});
}
}
public class Adapter_PhotosFolder extends ArrayAdapter<Model_images> {
Context context;
ViewHolder viewHolder;
ArrayList<Model_images> al_menu = new ArrayList<>();
public Adapter_PhotosFolder(Context context, ArrayList<Model_images> al_menu) {
super(context, R.layout.activity_adapter__photos_folder, al_menu);
this.al_menu = al_menu;
this.context = context;
}
@Override
public int getCount() {
Log.e("ADAPTER LIST SIZE", al_menu.size() + "");
return al_menu.size();
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public int getViewTypeCount() {
if (al_menu.size() > 0) {
return al_menu.size();
} else {
return 1;
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_adapter__photos_folder, parent, false);
viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tv_foldern.setText(al_menu.get(position).getStr_folder());
viewHolder.tv_foldersize.setText(al_menu.get(position).getAl_imagepath().size()+"");
Glide.with(context).load("file://" + al_menu.get(position).getAl_imagepath().get(0))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(viewHolder.iv_image);
return convertView;
}
private static class ViewHolder {
TextView tv_foldern, tv_foldersize;
ImageView iv_image;
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/jazzy_pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/fullImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="centerCrop"
/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
TouchImageAdapter.java:
public class GridViewAdapter extends ArrayAdapter<Model_images> {
Context context;
ViewHolder viewHolder;
ArrayList<Model_images> al_menu = new ArrayList<>();
int int_position;
public GridViewAdapter(Context context, ArrayList<Model_images> al_menu,int int_position) {
super(context, R.layout.activity_adapter__photos_folder, al_menu);
this.al_menu = al_menu;
this.context = context;
this.int_position = int_position;
}
@Override
public int getCount() {
Log.e("ADAPTER LIST SIZE", al_menu.get(int_position).getAl_imagepath().size() + "");
return al_menu.get(int_position).getAl_imagepath().size();
}
@Override
public int getItemViewType(int position) {
return position;
}
@Override
public int getViewTypeCount() {
if (al_menu.get(int_position).getAl_imagepath().size() > 0) {
return al_menu.get(int_position).getAl_imagepath().size();
} else {
return 1;
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_adapter__photos_folder, parent, false);
viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tv_foldern.setVisibility(View.GONE);
viewHolder.tv_foldersize.setVisibility(View.GONE);
Glide.with(context).load("file://" + al_menu.get(int_position).getAl_imagepath().get(position))
.diskCacheStrategy(DiskCacheStrategy.NONE)
.skipMemoryCache(true)
.into(viewHolder.iv_image);
return convertView;
}
private static class ViewHolder {
TextView tv_foldern, tv_foldersize;
ImageView iv_image;
}
}
public class Model_images {
String str_folder;
ArrayList<String> al_imagepath;
public String getStr_folder() {
return str_folder;
}
public void setStr_folder(String str_folder) {
this.str_folder = str_folder;
}
public ArrayList<String> getAl_imagepath() {
return al_imagepath;
}
public void setAl_imagepath(ArrayList<String> al_imagepath) {
this.al_imagepath = al_imagepath;
}
}
public class FullImageActivity extends AppCompatActivity {
ImageView images;
int position;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_full_image);
Intent i = getIntent();
images = (ImageView) findViewById(R.id.fullImage);
// Selected image id
position = i.getExtras().getInt("id");
Bundle extras = getIntent().getExtras();
String value = extras.getString("abc");
Glide.with(FullImageActivity.this)
.load(value)
.skipMemoryCache(false)
.into(images);
ViewPager mViewPager = (ViewPager) findViewById(R.id.viewpager);
mViewPager.setAdapter(new TouchImageAdapter(this,al_images));
}
}
class TouchImageAdapter extends PagerAdapter {
Context context;
String filename;
ArrayList<Model_images> al_menu = new ArrayList<>();
int position,int_position;
public TouchImageAdapter(Context context,ArrayList<Model_images> al_menu){
this.al_menu = al_menu;
this.context = context;
}
@Override
public int getCount() {
return al_menu.size();
}
@Override
public View instantiateItem(ViewGroup container, int position) {
ImageView img = new ImageView(container.getContext());
img.setImageDrawable(getImageFromSdCard(filename,position));
container.addView(img, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
return img;
}
public int getItemPosition(Object object) {
return POSITION_NONE;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
public Drawable getImageFromSdCard(String imageName,int position) {
Drawable d = null;
try {
String path = al_menu.get(int_position).getAl_imagepath().get(position)
+ "/";
Bitmap bitmap = BitmapFactory.decodeFile(path + "/" + imageName
+ ".jpeg");
d = new BitmapDrawable(context.getResources(),bitmap);
} catch (IllegalArgumentException e) {
// TODO: handle exception
}
return d;
}
}
class TouchImageAdapter扩展了PagerAdapter{
语境;
字符串文件名;
ArrayList al_菜单=新建ArrayList();
int位置,int_位置;
公共TouchImageAdapter(上下文,ArrayList al_菜单){
this.al_menu=al_menu;
this.context=上下文;
}
@凌驾
public int getCount(){
返回al_menu.size();
}
@凌驾
公共视图实例化项(视图组容器,int位置){
ImageView img=newImageView(container.getContext());
setImageDrawable(getImageFromSdCard(文件名、位置));
container.addView(img,LinearLayout.LayoutParams.MATCH_父项,LinearLayout.LayoutParams.MATCH_父项);
返回img;
}
public int getItemPosition(对象){
返回位置\无;
}
@凌驾
公共项(视图组容器、int位置、对象){
container.removeView((视图)对象);
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图==对象;
}
公共可提取getImageFromSdCard(字符串imageName,int位置){
可提取d=null;
试一试{
字符串路径=al_菜单.get(int_位置).getAl_图像路径().get(位置)
+ "/";
位图位图=位图工厂.decodeFile(路径+“/”+imageName
+“.jpeg”);
d=新的BitmapDrawable(context.getResources(),位图);
}捕获(IllegalArgumentException e){
//TODO:处理异常
}
返回d;
}
}
试试这个
String[] filenames = new String[0];
File path = new File(Environment.getExternalStorageDirectory() + "/your folder");
if (path.exists()) {
filenames = path.list();
}
for (int i = 0; i < filenames.length; i++) {
imagesPathArrayList.add(path.getPath() + "/" + filenames[i]);
Log.e("FAV_Images", imagesPathArrayList.get(i));
adapter = new ImageAdapter(FavActivity.this, imagesPathArrayList);
myviewpager.setAdapter(adapter);
}
String[]filename=新字符串[0];
文件路径=新文件(Environment.getExternalStorageDirectory()+“/your folder”);
if(path.exists()){
filenames=path.list();
}
对于(int i=0;i
像这样创建适配器类
public class ImageAdapter extends PagerAdapter {
Context context;
ArrayList<String> arrayList;
ImageAdapter(Context context, ArrayList<String> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
@Override
public int getCount() {
return arrayList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((ImageView) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
viewPagerImageView = new ImageView(context);
viewPagerImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
Bitmap bitmap = BitmapFactory.decodeFile(arrayList.get(position));
viewPagerImageView.setImageBitmap(bitmap);
((ViewPager) container).addView(viewPagerImageView, 0);
return viewPagerImageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((ImageView) object);
}
}
公共类ImageAdapter扩展了PagerAdapter{
语境;
ArrayList ArrayList;
ImageAdapter(上下文上下文,ArrayList ArrayList){
this.context=上下文;
this.arrayList=arrayList;
}
@凌驾
public int getCount(){
返回arrayList.size();
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图==((图像视图)对象);
}
@凌驾
公共对象实例化项(视图组容器,int位置){
viewPagerImageView=新图像视图(上下文);
viewPagerImageView.setScaleType(ImageView.ScaleType.CENTER\U裁剪);
位图Bitmap=BitmapFactory.decodeFile(arrayList.get(position));
viewPagerImageView.setImageBitmap(位图);
((ViewPager)容器).addView(viewPagerImageView,0);
返回视图PageRimageView;
}
@凌驾
公共项(视图组容器、int位置、对象){
((ViewPager)容器)。移除视图((ImageView)对象);
}
}
看起来您正在查看页面上方显示Imageview
images = (ImageView) findViewById(R.id.fullImage);
这就是为什么当您尝试滑动imageview时,请处理您的tocuh操作,而不是查看寻呼机。移除它 此处您没有传递该文件夹内的图像计数,因此在TouchImageAdapter中,您传递的是文件夹计数,如:
al_menu.size() // it always give you size of folder,
al_menu.get(int_position).getAl_imagepath().size();
// passing the folder position so that correct folder images are to be shown.
public TouchImageAdapter(Context context,ArrayList<Model_images> al_menu, int position){
this.al_menu = al_menu;
this.context = context;
this.int_position = position;
}
@Override
public int getCount() {
return al_menu.get(int_position).getAl_imagepath().size();
}
al_menu.size()//它总是提供文件夹的大小,
al_菜单.get(int_位置).getAl_图像路径().size();
//传递文件夹位置,以便显示正确的文件夹图像。
公共TouchImageAdapter(上下文、ArrayList al_菜单、int位置){
this.al_menu=al_menu;
this.context=上下文;
this.int_position=位置;
}
@凌驾
public int getCount(){
返回al_菜单.get(int_位置).getAl_图像路径().size();
}
这是我推的更新代码
您是否在清单文件中获得了许可?是的,我获得了许可,并且图像正在应用程序中显示,只是下一个图像在刷@nileshrathodw时没有显示。日志中的al_菜单打印大小是多少?也许我不清楚您在问什么,但我认为它与文件夹中的图像数量相同,就像我打开应用程序时,它会在日志“09-18 12:33:05.792 21586-21586/com.example.dell_1.Myapp3 E/适配器列表大小:10”中打印,当我打开任何包含图像的文件夹时,它会打印适配器列表大小的类似语句:“文件夹中的图像数”@NileshRathod@RedViper请发布您的
FullImageActivity
的XML。实际上,我的应用程序在不同的文件夹中显示图像,或者在不同的文件夹中显示图像,请查看上面更新的问题,根据我下面的教程,我可以刷卡,但为什么相同的图像会一次又一次地显示在全屏上?对不起,我对android是全新的,几个月前才开始使用我不明白,你提供的代码和