To use RecyclerView + CardView, we have to "Add Support Libraries of RecyclerView, CardView to Android Studio Project".
layout/layout_cardview.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
card_view:cardCornerRadius="20sp"
card_view:cardElevation="5sp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="@+id/item_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/item_uri"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18dp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
com.blogspot.android_er.android_action_open_document.MyRecyclerViewAdapter.java
package com.blogspot.android_er.android_action_open_document;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
public class MyRecyclerViewAdapter extends
RecyclerView.Adapter<MyRecyclerViewAdapter.ItemHolder>{
private List<Uri> itemsUri;
private LayoutInflater layoutInflater;
private Context context;
public MyRecyclerViewAdapter(Context context){
this.context = context;
layoutInflater = LayoutInflater.from(context);
itemsUri = new ArrayList<Uri>();
}
@Override
public ItemHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
CardView itemCardView = (CardView)layoutInflater.inflate(R.layout.layout_cardview, viewGroup, false);
return new ItemHolder(itemCardView, this);
}
@Override
public void onBindViewHolder(ItemHolder itemHolder, int i) {
Uri targetUri = itemsUri.get(i);
itemHolder.setItemUri(targetUri.getPath());
if (targetUri != null){
try {
//! CAUTION !
//I'm not sure is it properly to load bitmap here!
itemHolder.setImageView(loadScaledBitmap(targetUri));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
/*
reference:
Load scaled bitmap
http://android-er.blogspot.com/2013/08/load-scaled-bitmap.html
*/
private Bitmap loadScaledBitmap(Uri src) throws FileNotFoundException {
// required max width/height
final int REQ_WIDTH = 400;
final int REQ_HEIGHT = 400;
Bitmap bm = null;
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(context.getContentResolver().openInputStream(src),
null, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, REQ_WIDTH,
REQ_HEIGHT);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeStream(
context.getContentResolver().openInputStream(src), null, options);
return bm;
}
public int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
@Override
public int getItemCount() {
return itemsUri.size();
}
public void add(int location, Uri iUri){
itemsUri.add(location, iUri);
notifyItemInserted(location);
}
public void clearAll(){
int itemCount = itemsUri.size();
if(itemCount>0){
itemsUri.clear();
notifyItemRangeRemoved(0, itemCount);
}
}
public static class ItemHolder extends RecyclerView.ViewHolder{
private MyRecyclerViewAdapter parent;
private CardView cardView;
TextView textItemUri;
ImageView imageView;
public ItemHolder(CardView cView, MyRecyclerViewAdapter parent) {
super(cView);
cardView = cView;
this.parent = parent;
textItemUri = (TextView) cardView.findViewById(R.id.item_uri);
imageView = (ImageView) cardView.findViewById(R.id.item_image);
}
public void setItemUri(CharSequence name){
textItemUri.setText(name);
}
public void setImageView(Bitmap bitmap){
imageView.setImageBitmap(bitmap);
}
}
}
layout/activity_main.xml
<LinearLayout
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"
android:padding="10dp"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<Button
android:id="@+id/opendocument"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Open Document of Image/Video" />
<android.support.v7.widget.RecyclerView
android:id="@+id/myrecyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
com.blogspot.android_er.android_action_open_document.MainActivity.java
package com.blogspot.android_er.android_action_open_document;
import android.content.ClipData;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private static final int RQS_OPEN = 1;
Button buttonOpen;
private RecyclerView myRecyclerView;
private StaggeredGridLayoutManager staggeredGridLayoutManagerVertical;
private MyRecyclerViewAdapter myRecyclerViewAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonOpen = (Button) findViewById(R.id.opendocument);
buttonOpen.setOnClickListener(buttonOpenOnClickListener);
myRecyclerView = (RecyclerView)findViewById(R.id.myrecyclerview);
staggeredGridLayoutManagerVertical =
new StaggeredGridLayoutManager(
2, //The number of Columns in the grid
LinearLayoutManager.VERTICAL);
myRecyclerViewAdapter = new MyRecyclerViewAdapter(this);
myRecyclerView.setAdapter(myRecyclerViewAdapter);
myRecyclerView.setLayoutManager(staggeredGridLayoutManagerVertical);
}
View.OnClickListener buttonOpenOnClickListener =
new View.OnClickListener() {
@Override
public void onClick(View v) {
//Open multi-type using Intent.ACTION_OPEN_DOCUMENT
//Open multi-file
Intent intent = new Intent();
intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
startActivityForResult(intent, RQS_OPEN);
Toast.makeText(MainActivity.this,
"Single-selection: Tap on any file.\n" +
"Multi-selection: Tap & Hold on the first file, " +
"tap for more, tap on OPEN to finish.",
Toast.LENGTH_LONG).show();
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
myRecyclerViewAdapter.clearAll();
if (resultCode == RESULT_OK) {
if (requestCode == RQS_OPEN) {
ClipData clipData = data.getClipData();
if(clipData == null){
myRecyclerViewAdapter.add(
myRecyclerViewAdapter.getItemCount(),
data.getData());
}else{
for(int i=0; i<clipData.getItemCount(); i++){
ClipData.Item item = clipData.getItemAt(i);
Uri uri = item.getUri();
//s += uri.toString() + "\n";
myRecyclerViewAdapter.add(
myRecyclerViewAdapter.getItemCount(),
uri);
}
}
}
}
}
}
Download the files (Android Studio Format) .How it run on Bluestacks App Player, refer: "Install Bluestacks App Player on Windows 10, and test your app".
More example:
- for Intent.ACTION_OPEN_DOCUMENT
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