Android load all photos place into RecyclerView,support pinch to zoom by ScaleGestureDetector,Java(3)
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_MEDIA_IMAGES" /> implementation 'com.github.piasy:BigImageViewer:1.8.1'
implementation 'com.github.piasy:GlideImageLoader:1.8.1'import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
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 RecyclerView mRecyclerView = null;
private PhotoAdapter mPhotoAdapter = null;
private GridLayoutManager mLayoutManager = null;
private ScaleGestureDetector mScaleGestureDetector = null;
private String TAG = "fly";
private int[] ZOOM = {3, 5, 9};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = findViewById(R.id.recycler_view);
mLayoutManager = new GridLayoutManager(this, ZOOM[2]);
mLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
mScaleGestureDetector = new ScaleGestureDetector(this, new ScaleGestureDetector.SimpleOnScaleGestureListener() {
@Override
public boolean onScaleBegin(@NonNull ScaleGestureDetector detector) {
Log.d(TAG, "--onScaleBegin--");
return super.onScaleBegin(detector);
}
@Override
public boolean onScale(@NonNull ScaleGestureDetector detector) {
Log.d(TAG, "--onScale--");
return super.onScale(detector);
}
@Override
public void onScaleEnd(@NonNull ScaleGestureDetector detector) {
super.onScaleEnd(detector);
Log.d(TAG, "--onScaleEnd--");
Log.d(TAG, "TimeDelta-" + detector.getTimeDelta());
Log.d(TAG, "ScaleFactor-" + detector.getScaleFactor());
Log.d(TAG, "currentSpan-" + detector.getCurrentSpan());
scale(detector);
}
private boolean scale(ScaleGestureDetector detector) {
if (detector.getCurrentSpan() > 50 && detector.getTimeDelta() > 10) {
float scaleFactor = detector.getScaleFactor();
int curSpanCount = mLayoutManager.getSpanCount();
Log.d(TAG, "LayoutManager SpanCount()-$curSpanCount");
int curIndex = getSpanCountIndex(curSpanCount);
if (scaleFactor < 1) {
if (curSpanCount == ZOOM[ZOOM.length - 1]) {
return true;
} else {
mLayoutManager.setSpanCount(ZOOM[curIndex + 1]);
}
} else {
if (curSpanCount == ZOOM[0]) {
return true;
} else {
mLayoutManager.setSpanCount(ZOOM[curIndex - 1]);
}
}
mRecyclerView.setLayoutManager(mLayoutManager);
mPhotoAdapter.dataSetChanged();
return true;
}
return false;
}
});
mRecyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mScaleGestureDetector.onTouchEvent(event);
return false;
}
});
List<Photo> photos = readAllImage(this);
mPhotoAdapter = new PhotoAdapter(getApplicationContext(), photos);
mRecyclerView.setAdapter(mPhotoAdapter);
mPhotoAdapter.dataSetChanged();
}
private int getSpanCountIndex(int spanCount) {
int index = 0;
for (int i = 0; i < ZOOM.length; i++) {
if (spanCount == ZOOM[i]) {
index = i;
}
}
return index;
}
private static List<Photo> readAllImage(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
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, getImageUri(context, path));
photos.add(photo);
}
cursor.close();
return photos;
}
private 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);
}
}
}<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>import android.content.Context;
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.List;
public class PhotoAdapter extends RecyclerView.Adapter<PhotoAdapter.PhotoViewHolder> {
private List<Photo> photos;
public PhotoAdapter(Context context, List<Photo> photos) {
this.photos = photos;
BigImageViewer.initialize(GlideImageLoader.with(context));
}
@Override
public PhotoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.photo, parent, false);
PhotoViewHolder holder = new PhotoViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(PhotoViewHolder holder, int position) {
holder.textView.setText(String.valueOf(position));
holder.imageView.showImage(photos.get(position).uri);
}
@Override
public 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 void dataSetChanged() {
notifyDataSetChanged();
}
}<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="1dp"
android:layout_marginTop="1dp"
android:layout_marginRight="1dp">
<com.github.piasy.biv.view.BigImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
app:failureImage="@android:drawable/ic_dialog_alert"
app:failureImageInitScaleType="center"
app:optimizeDisplay="true" />
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/image"
android:layout_centerHorizontal="true"
android:maxLines="1"
android:text="-.-"
android:textColor="@android:color/black" />
</RelativeLayout>import android.net.Uri;
public class Photo {
public String name;//名称
public String date;//日期
public long size; //大小
public String path;//路径
public Uri uri;
public Photo(String name, String date, long size, String path, Uri uri) {
this.name = name;
this.date = date;
this.size = size;
this.path = path;
this.uri=uri;
}
}