将图库中的所有图像加载到 android 中的应用程序中 [英] Loading all the images from gallery into the Application in android
本文介绍了将图库中的所有图像加载到 android 中的应用程序中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在创建一个应用程序，其中我需要将图库中的所有图像放入其中具有 girdview 的应用程序中.我希望所有文件夹中的所有图像都出现在 gridview 中.
String[] proj = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };实际图像光标 = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,null, null, MediaStore.Images.Media.DEFAULT_SORT_ORDER);actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);actualimagecursor.moveToPosition(position);String i = actualimagecursor.getString(actual_image_column_index);我已将此代码添加到我的代码中，但我只获得了 sd 卡图像，没有获得其他文件夹图像.如何从图库中获取所有图像?
提前致谢.
解决方案
在 Glide 的帮助下工作的解决方案.奖励部分是 Glide 会自动播放 Gif.
import java.util.ArrayList;导入 android.app.Activity;导入 android.database.Cursor;导入android.net.Uri；导入 android.os.Bundle;导入 android.provider.MediaStore;导入 android.provider.MediaStore.MediaColumns;导入 android.view.View;导入 android.view.ViewGroup;导入 android.widget.AdapterView;导入 android.widget.AdapterView.OnItemClickListener;导入 android.widget.BaseAdapter;导入 android.widget.GridView;导入 android.widget.ImageView;导入 android.widget.Toast;进口 com.bumptech.glide.Glide;/*** 类 GallarySample.*/公共类 GallarySample 扩展活动 {/** 图片.*/私有 ArrayList图片;@覆盖public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.gallery_activity);GridView 画廊 = (GridView) findViewById(R.id.galleryGridView);Gallery.setAdapter(new ImageAdapter(this));Gallery.setOnItemClickListener(new OnItemClickListener() {@覆盖public void onItemClick(AdapterView<?> arg0, View arg1,int 位置，长 arg3) {if (null != images && !images.isEmpty())Toast.makeText(getApplicationContext(),位置"+位置+"+images.get(位置)，300).show();;}});}/*** 类 ImageAdapter.*/私有类 ImageAdapter 扩展 BaseAdapter {/** 上下文.*/私人活动上下文；/*** 实例化一个新的图像适配器.** @param localContext* 当地情况*/公共图像适配器(活动本地上下文){上下文 = 本地上下文；图像 = getAllShownImagesPath(context);}公共 int getCount() {返回图像大小()；}公共对象 getItem(int position) {返回位置；}public long getItemId(int position) {返回位置；}public View getView(final int position, View convertView,视图组父级) {ImageView 图片查看；if (convertView == null) {图片视图 = 新图像视图(上下文)；图片视图.setScaleType(ImageView.ScaleType.FIT_CENTER);图片查看.setLayoutParams(new GridView.LayoutParams(270, 270));} 别的 {图片视图 = (ImageView) convertView;}Glide.with(context).load(images.get(position)).placeholder(R.drawable.ic_launcher).centerCrop().into(picturesView);返回图片查看；}/*** 获取所有图像路径.** @param 活动* 活动* @return ArrayList 与图像路径*/私有 ArrayListgetAllShownImagesPath(活动活动){乌里乌里;光标光标；int column_index_data, column_index_folder_name;ArrayListlistOfAllImages = new ArrayList();String absolutePathOfImage = null;uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;String[] 投影 = { MediaColumns.DATA,MediaStore.Images.Media.BUCKET_DISPLAY_NAME };cursor = activity.getContentResolver().query(uri,projection,null,空，空)；column_index_data = cursor.getColumnIndexOrThrow(MediaColumns.DATA);column_index_folder_name = 游标.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);而 (cursor.moveToNext()) {absolutePathOfImage = cursor.getString(column_index_data);listOfAllImages.add(absolutePathOfImage);}返回 listOfAllImages;}}} gridView 的布局文件
<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" ><网格视图android:id="@+id/galleryGridView"android:layout_width="match_parent"android:layout_height="wrap_content"android:columnWidth="280dp"机器人:重力=中心"机器人:水平间距=2dp"机器人:numColumns =2"机器人:填充=2dp"android:stretchMode="columnWidth"android:verticalSpacing="2dp" ></GridView></RelativeLayout>使用 Kotlin 和 LoderManager 更新 2019:
** 2) 使用 LoderManager 加载异步加载图像.**
在您的 Activity 或 Fragment 类中实现 LoaderManager.LoaderCallbacks
覆盖 LoaderCallbacks:
private val IMAGE_LOADER_ID = 1私有 val listOfAllImages = ArrayList()override fun onCreateLoader(p0: Int, p1: Bundle?): Loader{val uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URIval 投影 = arrayOf(MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME)val 选择:字符串?= null//选择条件val selectionArgs = arrayOf()//选择标准val sortOrder:字符串?= 空返回 CursorLoader(活动!!.applicationContext,尿，投影，选择，选择参数，排序)}覆盖 fun onLoadFinished(loader: Loader, cursor: Cursor?) {光标?.let {val columnIndexData = it.getColumnIndexOrThrow(MediaColumns.DATA);而 (it.moveToNext()) {listOfAllImages.add(it.getString(columnIndexData));}}}覆盖乐趣 onLoaderReset(loader: Loader) {} 最后关于 onCreate 方法初始化加载器:
loaderManager.initLoader(IMAGE_LOADER_ID,空值，这个)3) 使用 Kotlin 协程 &ViewModel
<块引用>实现'androidx.core:core-ktx:1.0.2'
实现'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0-M2'
实现org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0-M2"
使用Coroutine上下文
/*** 使用协程加载图片*/类 ImageViewModel : ViewModel(), CoroutineScope {私人 val 作业 = Job()覆盖 val coroutineContext: CoroutineContextget() = 作业 + Dispatchers.Mainprivate var imagesLiveData: MutableLiveData>= MutableLiveData()fun getImageList(): MutableLiveData>{返回图像LiveData}/*** 获取所有图像路径.** 所需的存储权限** @return ArrayList 与图像路径*/内部乐趣 loadImagesfromSDCard(): ArrayList{val uri: uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URIval游标:游标?val column_index_data: Intval column_index_folder_name: Intval listOfAllImages = ArrayList()var absolutePathOfImage:字符串?= 空val 投影 = arrayOf(MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME)cursor = AppController.globalContentResolvere!!.query(uri,projection,null,null,null)column_index_data = cursor!!.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA)column_index_folder_name = 游标！！.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME)而(光标！！.moveToNext()){absolutePathOfImage = cursor!!.getString(column_index_data)listOfAllImages.add(absolutePathOfImage)}返回 listOfAllImages}有趣的 getAllImages() {启动(Dispatchers.Main){imagesLiveData.value = withContext(Dispatchers.IO) {loadImagesfromSDCard()}}}} 然后使用viewModel
val imageViewModel = ViewModelProviders.of(this).get(ImageViewModel::class.java)imageViewModel.getImageList().observe(this, Observer> { listOfImage ->imageWidgetStatus.text = """找到 ${listOfImage.size} 个图像"""//加载图片imageViewModel.getAllImages() I am creating an application wherein I need all the images in the gallery into my application that has a girdview in it. I want all the images from all the folders to appear in the gridview.
String[] proj = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
actualimagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
null, null, MediaStore.Images.Media.DEFAULT_SORT_ORDER);
actual_image_column_index = actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
actualimagecursor.moveToPosition(position);
String i = actualimagecursor.getString(actual_image_column_index);
I have added this code into my code but i get only the sd card images no other folder images are obtained. How can i get all the images from the gallery?
Thanks in advance.
解决方案
Working solution with the help of Glide. Bonus part is Glide will auto play Gif .
import java.util.ArrayList;
import android.app.Activity;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.provider.MediaStore.MediaColumns;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
/**
* The Class GallarySample.
*/
public class GallarySample extends Activity {
/** The images. */
private ArrayList<String> images;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery_activity);
GridView gallery = (GridView) findViewById(R.id.galleryGridView);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
if (null != images && !images.isEmpty())
Toast.makeText(
getApplicationContext(),
"position " + position + " " + images.get(position),
300).show();
;
}
});
}
/**
* The Class ImageAdapter.
*/
private class ImageAdapter extends BaseAdapter {
/** The context. */
private Activity context;
/**
* Instantiates a new image adapter.
*
* @param localContext
* the local context
*/
public ImageAdapter(Activity localContext) {
context = localContext;
images = getAllShownImagesPath(context);
}
public int getCount() {
return images.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
ViewGroup parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER);
picturesView
.setLayoutParams(new GridView.LayoutParams(270, 270));
} else {
picturesView = (ImageView) convertView;
}
Glide.with(context).load(images.get(position))
.placeholder(R.drawable.ic_launcher).centerCrop()
.into(picturesView);
return picturesView;
}
/**
* Getting All Images Path.
*
* @param activity
* the activity
* @return ArrayList with images Path
*/
private ArrayList<String> getAllShownImagesPath(Activity activity) {
Uri uri;
Cursor cursor;
int column_index_data, column_index_folder_name;
ArrayList<String> listOfAllImages = new ArrayList<String>();
String absolutePathOfImage = null;
uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = { MediaColumns.DATA,
MediaStore.Images.Media.BUCKET_DISPLAY_NAME };
cursor = activity.getContentResolver().query(uri, projection, null,
null, null);
column_index_data = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
column_index_folder_name = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
while (cursor.moveToNext()) {
absolutePathOfImage = cursor.getString(column_index_data);
listOfAllImages.add(absolutePathOfImage);
}
return listOfAllImages;
}
}
}
Layout file for gridView
<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" >
<GridView
android:id="@+id/galleryGridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:columnWidth="280dp"
android:gravity="center"
android:horizontalSpacing="2dp"
android:numColumns="2"
android:padding="2dp"
android:stretchMode="columnWidth"
android:verticalSpacing="2dp" >
</GridView>
</RelativeLayout>
UPDATE 2019 with Kotlin and LoderManager:
** 2) Use LoderManager to load async load images.**
Implement LoaderManager.LoaderCallbacks<Cursor> in your activity or Fragment class
Override LoaderCallbacks this:
private val IMAGE_LOADER_ID = 1
private val listOfAllImages = ArrayList<String>()
override fun onCreateLoader(p0: Int, p1: Bundle?): Loader<Cursor> {
val uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
val projection = arrayOf(MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME)
val selection: String? = null //Selection criteria
val selectionArgs = arrayOf<String>() //Selection criteria
val sortOrder: String? = null
return CursorLoader(
activity!!.applicationContext,
uri,
projection,
selection,
selectionArgs,
sortOrder)
}
override fun onLoadFinished(loader: Loader<Cursor>, cursor: Cursor?) {
cursor?.let {
val columnIndexData = it.getColumnIndexOrThrow(MediaColumns.DATA);
while (it.moveToNext()) {
listOfAllImages.add(it.getString(columnIndexData));
}
}
}
override fun onLoaderReset(loader: Loader<Cursor>) {
}
Lastly on onCreate method init loader:
loaderManager.initLoader(IMAGE_LOADER_ID,
null,
this)
3) Using Kotlin Coroutine & ViewModel
implementation 'androidx.core:core-ktx:1.0.2'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0-M2'
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.0-M2"
Create View Model With Coroutine Context
/**
* Use Coroutines To Load Images
*/
class ImageViewModel : ViewModel(), CoroutineScope {
private val job = Job()
override val coroutineContext: CoroutineContext
get() = job + Dispatchers.Main
private var imagesLiveData: MutableLiveData<List<String>> = MutableLiveData()
fun getImageList(): MutableLiveData<List<String>> {
return imagesLiveData
}
/**
* Getting All Images Path.
*
* Required Storage Permission
*
* @return ArrayList with images Path
*/
internal fun loadImagesfromSDCard(): ArrayList<String> {
val uri: Uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI
val cursor: Cursor?
val column_index_data: Int
val column_index_folder_name: Int
val listOfAllImages = ArrayList<String>()
var absolutePathOfImage: String? = null
val projection = arrayOf(MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME)
cursor = AppController.globalContentResolvere!!.query(uri, projection, null, null, null)
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)
listOfAllImages.add(absolutePathOfImage)
}
return listOfAllImages
}
fun getAllImages() {
launch(Dispatchers.Main) {
imagesLiveData.value = withContext(Dispatchers.IO) {
loadImagesfromSDCard()
}
}
}
}
And then use viewModel
val imageViewModel = ViewModelProviders.of(this).get(ImageViewModel::class.java)
imageViewModel.getImageList().observe(this, Observer<List<String>> { listOfImage ->
imageWidgetStatus.text = """ Found ${listOfImage.size} Images"""
// load images
imageViewModel.getAllImages()
这篇关于将图库中的所有图像加载到 android 中的应用程序中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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