Android LoaderManager AsyncTaskLoader加载全部图片RecyclerView BigImageView呈现，Java（1）

权限：

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />

引用：

    implementation 'com.github.piasy:BigImageViewer:1.8.1'implementation 'com.github.piasy:GlideImageLoader:1.8.1'

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.loader.app.LoaderManager;
import androidx.loader.content.AsyncTaskLoader;
import androidx.loader.content.Loader;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;public class MainActivity extends AppCompatActivity {private static String TAG = "fly";private LoaderManager loaderManager;private PhotoAdapter photoAdapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);RecyclerView recyclerView = findViewById(R.id.recyclerview);LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);recyclerView.setLayoutManager(linearLayoutManager);photoAdapter= new PhotoAdapter(this);recyclerView.setAdapter(photoAdapter);setupLoader();}private static List<Photo> readImage(Context context) {List<Photo> photos = new ArrayList<>();//读取手机图片Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);while (cursor.moveToNext()) {//图片的路径String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));//图片名称String name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME));//图片最后修改日期//String date_modified = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATE_MODIFIED));File file = new File(path);SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");String date = sdf.format(new Date(file.lastModified()));//图片大小long size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.SIZE));Photo photo = new Photo(name, date, size, path);photos.add(photo);}return photos;}private void setupLoader() {loaderManager = LoaderManager.getInstance(this);loaderManager.initLoader(2023, new Bundle(), loaderCallbacks);}private LoaderManager.LoaderCallbacks loaderCallbacks = new LoaderManager.LoaderCallbacks<List<Photo>>() {@NonNull@Overridepublic MyLoader onCreateLoader(int id, @Nullable Bundle args) {Log.d(TAG, "onCreateLoader- id - " + id);MyLoader loader = new MyLoader(getApplicationContext());return loader;}@Overridepublic void onLoadFinished(@NonNull Loader<List<Photo>> loader, List<Photo> photos) {Log.d(TAG, "onLoadFinished- " + loader.getId() + " - " + photos.size());photoAdapter.dataChanged(photos);}@Overridepublic void onLoaderReset(@NonNull Loader loader) {}};@Overrideprotected void onStart() {super.onStart();Log.d(TAG, "---");Log.d(TAG, "onStart");}@Overrideprotected void onResume() {super.onResume();Log.d(TAG, "onResume");}@Overrideprotected void onStop() {super.onStop();Log.d(TAG, "onStop");}private static class MyLoader extends AsyncTaskLoader<List<Photo>> {private Context context;public MyLoader(@NonNull Context context) {super(context);this.context = context;}@Overrideprotected void onStartLoading() {super.onStartLoading();Log.d(TAG, "onStartLoading- " + getId());this.forceLoad();}//work thread@Nullable@Overridepublic List<Photo> loadInBackground() {return readImage(context);}//UI main thread@Overridepublic void deliverResult(@Nullable List<Photo> photos) {super.deliverResult(photos);Log.d(TAG, "deliverResult- " + getId() + " 图片总量:" + photos.size());}@Overridepublic void onContentChanged() {super.onContentChanged();Log.d(TAG, "onContentChanged- " + getId());}}
}

R.layout.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/recyclerview"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"></androidx.recyclerview.widget.RecyclerView>

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;import androidx.recyclerview.widget.RecyclerView;import com.github.piasy.biv.BigImageViewer;
import com.github.piasy.biv.loader.glide.GlideImageLoader;
import com.github.piasy.biv.view.BigImageView;import java.util.ArrayList;
import java.util.List;public class PhotoAdapter extends RecyclerView.Adapter<PhotoAdapter.PhotoViewHolder> {private Context context;private List<Photo> photos = new ArrayList<>();public PhotoAdapter(Context context) {this.context = context;BigImageViewer.initialize(GlideImageLoader.with(context));}public void dataChanged(List<Photo> photos) {this.photos = photos;notifyDataSetChanged();}@Overridepublic PhotoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_item, parent, false);PhotoViewHolder holder = new PhotoViewHolder(view);return holder;}@Overridepublic void onBindViewHolder(PhotoViewHolder holder, int pos) {holder.textView.setText(photos.get(pos).name);holder.imageView.showImage(getImageUri(context, photos.get(pos).path));//Glide.with(context).load(new File(photos.get(pos).path)).into(holder.imageView);}@Overridepublic int getItemCount() {return photos.size();}public class PhotoViewHolder extends RecyclerView.ViewHolder {public BigImageView imageView;public TextView textView;public PhotoViewHolder(View itemView) {super(itemView);imageView = itemView.findViewById(R.id.image);textView = itemView.findViewById(R.id.text);}}public static Uri getImageUri(Context context, String filePath) {Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,new String[]{MediaStore.Images.Media._ID}, MediaStore.Images.Media.DATA + "=? ",new String[]{filePath}, null);if (cursor != null && cursor.moveToFirst()) {int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.MediaColumns._ID));Uri baseUri = Uri.parse("content://media/external/images/media");return Uri.withAppendedPath(baseUri, "" + id);} else {ContentValues values = new ContentValues();values.put(MediaStore.Images.Media.DATA, filePath);return context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);}}
}

image_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><com.github.piasy.biv.view.BigImageViewandroid:id="@+id/image"android:layout_width="match_parent"android:layout_height="wrap_content" /><TextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content" /><Viewandroid:layout_width="match_parent"android:layout_height="1px"android:background="@android:color/darker_gray" /></LinearLayout>

public class Photo {public String name;//名称public String date;//日期public long size;  //大小public String path;//路径public Photo(String name, String date, long size, String path) {this.name = name;this.date = date;this.size = size;this.path = path;}
}

Android LoaderManager CursorLoader加载全部图片RecyclerView BigImageView呈现，Java（2）_zhangphil的博客-CSDN博客【Android设置头像，手机拍照或从本地相册选取图片作为头像】像微信、QQ、微博等社交类的APP，通常都有设置头像的功能，设置头像通常有两种方式：1，让用户通过选择本地相册之类的图片库中已有的图像，裁剪后作为头像。Android设置头像，手机拍照或从本地相册选取图片作为头像_android 头像拍照_zhangphil的博客-CSDN博客。Android图片添加文字水印并保存水印文字图片到指定文件_zhangphil的博客-CSDN博客。https://blog.csdn.net/zhangphil/article/details/129641492

天安旅行网