转到全图像屏幕

Question

我制作了一个 android 应用程序来将图像从 firebase 显示到回收器视图中，当用户单击图像时，它必须转到其全屏页面并尝试了几次，但它只显示空白活动

Answer 1

您可以使用PhotoView库(com.github.chrisbanes.photoview(显示全屏图片，如下所示： 这里使用短笛来显示图像，但您可以使用其他图像库，例如 壁画， 滑翔 .

活动大图像视图

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.view.Window;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.github.chrisbanes.photoview.PhotoView;
import com.github.chrisbanes.photoview.PhotoViewAttacher;
import com.squareup.picasso.Callback;
import com.squareup.picasso.Picasso;
import java.io.File;
import butterknife.BindView;
import butterknife.ButterKnife;
public class ActivityLargeImageView extends FragmentActivity {
@BindView(R.id.photoview_image)
PhotoView photoviewImage;
@BindView(R.id.progressbar)
ProgressBar progressBar;

File mFile;
PhotoViewAttacher mAttacher;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_large_image_view);
ButterKnife.bind(this);
progressBar.setVisibility(View.VISIBLE);
String img_url = getIntent().getExtras().getString("image_url");
try {
mFile = new File(img_url);
} catch (Exception ex) {
}

if (mFile.exists()) {
Picasso.with(getApplicationContext()).load(mFile).into(photoviewImage, imageLoadedCallback);
} else {
Picasso.with(getApplicationContext()).load(img_url).into(photoviewImage, imageLoadedCallback);
}
}
Callback imageLoadedCallback = new Callback() {
@Override
public void onSuccess() {
if (mAttacher != null) {
mAttacher.update();
} else {
mAttacher = new PhotoViewAttacher(photoviewImage);
}
progressBar.setVisibility(View.GONE);
}
@Override
public void onError() {
Toast.makeText(getApplicationContext(), getResources().getString(R.string.error_message_connection_to_server), Toast.LENGTH_LONG).show();
}
};
}

XML 文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:background="#000000"
android:orientation="vertical" >

<com.github.chrisbanes.photoview.PhotoView
android:id="@+id/photoview_image"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ProgressBar
android:id="@+id/progressbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />

</FrameLayout>