Android Studio 和 Firebase：全屏显示 ImageView

Question

我有一个屏幕显示我的电影名称及其在我的 Firebase 中的图片。

我的数据库结构是这样的。name是我的电影名称的字符串。profilePic是包含来自 Firebase 存储的图片链接的字符串。

我想要的是，当我点击列出的任何图片时，我想在另一个更大尺寸的活动中显示它（比如打开某人的 WhatsApp 或 Facebook 个人资料图片）

这些是我的课程，效果很好。我怎样才能做到这一点？

MyAdapter.java

package com.example.XXXX;

import android.content.Context;

import android.support.annotation.NonNull;

import android.support.v7.widget.RecyclerView;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.TextView;

import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {

    Context context;

    ArrayList<Profile> profiles;

    public MyAdapter(Context c, ArrayList<Profile> p){

        context = c;

        profiles = p;

    }

    @NonNull

    @Override

    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

        return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.cardview,viewGroup, false));

    }

    @Override

    public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {

        myViewHolder.name.setText(profiles.get(i).getName());

        Picasso.get().load(profiles.get(i).getProfilePic()).into(myViewHolder.profilePic);

    }

    @Override

    public int getItemCount() {

        return profiles.size();

    }

    class MyViewHolder extends RecyclerView.ViewHolder{

        TextView name;

        ImageView profilePic;

        public MyViewHolder(@NonNull View itemView) {

            super(itemView);

            name = (TextView) itemView.findViewById(R.id.film_name);

            profilePic = (ImageView) itemView.findViewById(R.id.filmProfile);

        }

    }

}

Answer 1

将视图持有者修改为class MyViewHolder extends RecyclerView.ViewHolder{&nbsp; &nbsp; &nbsp; &nbsp; TextView name;&nbsp; &nbsp; &nbsp; &nbsp; ImageView profilePic;&nbsp; &nbsp; &nbsp; &nbsp; View mView;&nbsp; &nbsp; &nbsp; &nbsp; public MyViewHolder(@NonNull View itemView)&nbsp;&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; super(itemView);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; mView = itemView;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; name = (TextView) itemView.findViewById(R.id.film_name);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; profilePic = (ImageView) itemView.findViewById(R.id.filmProfile);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }在适配器中实现视图持有者的点击侦听器，然后使用图像 url 启动活动。@Overridepublic void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) {&nbsp; &nbsp; myViewHolder.name.setText(profiles.get(i).getName());&nbsp; &nbsp; Picasso.get().load(profiles.get(i).getProfilePic()).into(myViewHolder.profilePic);&nbsp;&nbsp;&nbsp; &nbsp; mViewHolder.mView.setOnClickListener(new View.OnClickListener(){&nbsp; &nbsp; &nbsp; &nbsp; @Override&nbsp; &nbsp; &nbsp; &nbsp; public void onClick(View v) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; startImageActivity(profiles.get(i).getProfilePic());&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; });}3.创建活动并从所需尺寸的图像视图开始。&nbsp; &nbsp; void startImageActivity(String imgUrl)&nbsp; &nbsp; {&nbsp; &nbsp; Intent intent = new Intent(context,ViewImage.class);&nbsp; &nbsp; intent.putExtra("profilePic",imgUrl);&nbsp; &nbsp; context.startActivity(intent);&nbsp; &nbsp; }或者在外部应用程序中打开图像尝试&nbsp; &nbsp; void startImageActivity(String imgUrl)&nbsp; &nbsp; {&nbsp; &nbsp;Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(imgUrl));&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;context.startActivity(intent);&nbsp; &nbsp; }

Answer 2

您可以使用此库进行放大和缩小功能，你需要在你的项目中添加这个 gradle实施 'com.otaliastudios:zoomlayout:1.6.1'检查下面的示例布局<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@color/dark_grey"    android:orientation="vertical"    android:weightSum="13">    <ImageView        android:id="@+id/iv_cancel"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="right"        android:layout_margin="@dimen/margin_small"        android:padding="@dimen/margin_small"        android:src="@drawable/ic_skip" />    <View        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_weight="6" />    <com.otaliastudios.zoom.ZoomImageView        android:id="@+id/zoom_image"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_weight="2"        android:scrollbars="vertical|horizontal"        app:alignment="center"        app:animationDuration="280"        app:flingEnabled="true"        app:horizontalPanEnabled="true"        app:maxZoom="2.5"        app:maxZoomType="zoom"        app:minZoom="0.7"        app:minZoomType="zoom"        app:overPinchable="true"        app:overScrollHorizontal="true"        app:overScrollVertical="true"        app:transformation="centerInside"        app:transformationGravity="auto"        app:verticalPanEnabled="true"        app:zoomEnabled="true" />    <View        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_weight="5" /></LinearLayout>在JAVA类中，您需要像下面这样加载图像，我正在使用 Glide 进行图像加载，如下所示 GlideApp.with(this)                    .asBitmap()                    .load(YOUR_IMAGE_URL)                    .into(new SimpleTarget<Bitmap>() {                        @Override                        public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {                            YOUR_IMAGEVIEW.setImageBitmap(resource);                        }                    });检查ZoomActivity.java下面的演示目的 public class ZoomActivity extends AppCompatActivity {    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        this.requestWindowFeature(Window.FEATURE_NO_TITLE);        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.activity_zoom);      //  ActivityZoomBinding mBinding = DataBindingUtil.setContentView(this, R.layout.activity_zoom);        ImageView zoomImage = findViewById(R.id.zoom_image);        ///GETTING INTENT DATA        Intent intent = getIntent();        if (intent.hasExtra("ZOOM_IMAGE")) {            String imageUrl = intent.getStringExtra("ZOOM_IMAGE");            GlideApp.with(this)                    .asBitmap()                    .load(imageUrl)                    .into(new SimpleTarget<Bitmap>() {                        @Override                        public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {                            zoomImage.setImageBitmap(resource);                        }                    });        }    }}

Answer 3

调整位图大小：Bitmap&nbsp;resizedBitmap&nbsp;=&nbsp;Bitmap.createScaledBitmap( &nbsp;&nbsp;&nbsp;&nbsp;originalBitmap,&nbsp;newWidth,&nbsp;newHeight,&nbsp;false);