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

compile 'com.android.support:appcompat-v7:26.+'compile 'com.android.support.constraint:constraint-layout:1.0.2'compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'compile 'com.facebook.fresco:fresco:0.12.0'testCompile 'junit:junit:4.12'

<RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"  android:layout_height="match_parent" tools:context="com.spl.dell.fresco_photowall.MainActivity">  <android.support.v7.widget.RecyclerView    android:id="@+id/main_recycler"    android:layout_width="match_parent"    android:layout_height="match_parent"></android.support.v7.widget.RecyclerView></RelativeLayout>

<RelativeLayout  xmlns:fresco="http://schemas.android.com/apk/res-auto"  xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.spl.dell.fresco_photowall.ZoomImageActivity">  <com.facebook.drawee.view.SimpleDraweeView    android:id="@+id/img_sdv"    android:background="@mipmap/ic_launcher"    android:layout_centerInParent="true"    android:layout_width="400dp"    android:layout_height="400dp" /></RelativeLayout>

<LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:fresco="http://schemas.android.com/apk/res-auto"  android:orientation="vertical" android:layout_width="match_parent"  android:layout_height="match_parent">  <com.facebook.drawee.view.SimpleDraweeView    android:id="@+id/sdv"    android:layout_marginLeft="35dp"    android:layout_width="100dp"    android:layout_height="100dp"    fresco:placeholderImage="@drawable/icon_placeholder"    fresco:placeholderImageScaleType="fitCenter"    fresco:progressBarImage="@drawable/icon_progress_bar"    fresco:progressBarImageScaleType="centerInside"    fresco:progressBarAutoRotateInterval="5000"    fresco:failureImage="@drawable/icon_failure"    fresco:failureImageScaleType="centerInside"    fresco:retryImage="@drawable/icon_retry"    fresco:retryImageScaleType="centerCrop"    /></LinearLayout>

import android.support.v7.widget.RecyclerView;import android.view.View;import com.facebook.drawee.view.SimpleDraweeView;import com.spl.dell.fresco_photowall.R;/** * Created by dell on 2018/3/8. */public class MyViewHolder extends RecyclerView.ViewHolder {  public SimpleDraweeView simpleDraweeView;  public MyViewHolder(View itemView) {    super(itemView);    simpleDraweeView = itemView.findViewById(R.id.sdv);  }}

import android.content.Context;import android.net.Uri;import android.support.v7.widget.RecyclerView;import android.view.View;import android.view.ViewGroup;import com.spl.dell.fresco_photowall.R;import com.spl.dell.fresco_photowall.recyclerview_adapter.viewholder.MyViewHolder;import java.io.File;import java.util.List;/** * Created by dell on 2018/3/8. */public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyViewHolder> {  Context context;  List<String> list;  public MyRecyclerViewAdapter(Context context, List<String> list) {    this.context = context;    this.list = list;  }  @Override  public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {    View view = View.inflate(context, R.layout.fresco_item, null);    MyViewHolder viewHolder = new MyViewHolder(view);    return viewHolder;  }  @Override  public void onBindViewHolder(MyViewHolder holder, final int position) {    Uri uri = Uri.fromFile(new File(list.get(position)));    holder.simpleDraweeView.setImageURI(uri);    holder.simpleDraweeView.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View view) {        onRecyclerItemClick.onItemClicklistener(position);      }    });  }  public void setOnItemClick(onRecyclerItemClick onRecyclerItemClick){    this.onRecyclerItemClick = onRecyclerItemClick;  }  @Override  public int getItemCount() {    return list.size();  }  onRecyclerItemClick onRecyclerItemClick;  public interface onRecyclerItemClick{    void onItemClicklistener(int position);  }}

import android.app.Application;import com.facebook.drawee.backends.pipeline.Fresco;/** * Created by dell on 2018/3/8. */public class MyApp extends Application {  @Override  public void onCreate() {    super.onCreate();    Fresco.initialize(this);  }}

import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.facebook.drawee.view.SimpleDraweeView;import java.io.File;public class ZoomImageActivity extends AppCompatActivity {  private SimpleDraweeView sdv;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    getSupportActionBar().hide();    setContentView(R.layout.activity_zoom_image);    Intent intent = getIntent();    String imgurl = intent.getStringExtra("imgurl");    Uri uri = Uri.fromFile(new File(imgurl));    sdv = (SimpleDraweeView) findViewById(R.id.img_sdv);    sdv.setImageURI(uri);  }}

import android.content.Intent;import android.database.Cursor;import android.os.Bundle;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.OrientationHelper;import android.support.v7.widget.RecyclerView;import com.spl.dell.fresco_photowall.recyclerview_adapter.MyRecyclerViewAdapter;import java.io.File;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {  private RecyclerView recycler;  private List<String> docs = new ArrayList<>();  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    getSupportActionBar().hide();    setContentView(R.layout.activity_main);    initView();    //recyclerview的數(shù)據(jù)源需要從手機(jī)相冊(cè)中獲取    initData();  }  private void initData() {    Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);    while(cursor.moveToNext()){      String paths = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));      File file = new File(paths);      String absolutePath = file.getAbsolutePath();      docs.add(absolutePath);    }    cursor.close();//    for(int i = 0;i<docs.size();i++){//      Log.d("TAG",docs.get(i).toString());//    }    runOnUiThread(new Runnable() {      @Override      public void run() {        MyRecyclerViewAdapter adapter = new MyRecyclerViewAdapter(MainActivity.this,docs);        recycler.setAdapter(adapter);        adapter.setOnItemClick(new MyRecyclerViewAdapter.onRecyclerItemClick() {          @Override          public void onItemClicklistener(int position) {            Intent intent = new Intent(MainActivity.this,ZoomImageActivity.class);            intent.putExtra("imgurl",docs.get(position));            startActivity(intent);          }        });      }    });  }  private void initView() {    recycler = (RecyclerView) findViewById(R.id.main_recycler);    RecyclerView.LayoutManager manager = new GridLayoutManager(MainActivity.this,3 ,OrientationHelper.VERTICAL,false);    recycler.setLayoutManager(manager);  }}