android RecyclerView pinch zoom,ScaleGestureDetector&GridLayoutManager,with BigImageViewer,java
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android RecyclerView pinch zoom,ScaleGestureDetector&GridLayoutManager,with BigImageViewer,java(3)
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
public class MainActivity extends AppCompatActivity
private RecyclerView mRecyclerView = null;
private PhotoAdapter mPhotoAdapter = null;
private GridLayoutManager mLayoutManager = null;
private ScaleGestureDetector mScaleGestureDetector = null;
private String TAG = "zhangphil";
private int[] ZOOM = 2, 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;
);
mPhotoAdapter = new PhotoAdapter(getApplicationContext(), 1000);
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;
<?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"
android:layoutAnimation="@anim/anim_layout" />
</RelativeLayout>
res/anim/anim_layout.xml：
<?xml version="1.0" encoding="utf-8"?>
<layoutAnimation xmlns:android="http://schemas.android.com/apk/res/android"
android:animation="@anim/animation_popup_enter"
android:animationOrder="normal"
android:delay="0.1" />
res/anim/animation_popup_enter.xml：
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<!--
<translate
android:duration="500"
android:fromXDelta="-100%"
android:fromYDelta="0"
android:toXDelta="0"
android:toYDelta="0" />
-->
<alpha
android:duration="500"
android:fromAlpha="0"
android:toAlpha="1" />
</set>
import android.content.ContentResolver;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.AnyRes;
import androidx.annotation.NonNull;
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;
public class PhotoAdapter extends RecyclerView.Adapter<PhotoAdapter.PhotoViewHolder>
private int itemCount;
private Context context;
public PhotoAdapter(Context context, int itemCount)
this.context = context;
this.itemCount = itemCount;
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(getUriFromResId(context, R.mipmap.android));
@Override
public int getItemCount()
return itemCount;
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();
private Uri getUriFromResId(@NonNull Context context, @AnyRes int drawableId)
return Uri.parse(
ContentResolver.SCHEME_ANDROID_RESOURCE
+ "://" + context.getResources().getResourcePackageName(drawableId)
+ '/' + context.getResources().getResourceTypeName(drawableId)
+ '/' + context.getResources().getResourceEntryName(drawableId)
);
<?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>
https://blog.csdn.net/zhangphil/article/details/129426905
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