我有一组图像，并且在按钮单击事件中正在替换图像源。更换图像源时出现闪烁效果。如何解决呢？
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
FirebaseDatabase database;
DatabaseReference myRef;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
PhotoView photoView = (PhotoView) findViewById(R.id.imageView);
mRecyclerView = (RecyclerView) findViewById(R.id.rv);
mRecyclerView.setHasFixedSize(true);
// mLayoutManager=new LinearLayoutManager(this);
//mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
database = FirebaseDatabase.getInstance();
myRef = database.getReference("Veg");
}
public void onStart() {
super.onStart();
FirebaseRecyclerAdapter<ModelClass, MainActivity.BlogViewHolder> firebaseRecyclerAdapter =
new FirebaseRecyclerAdapter<ModelClass, MainActivity.BlogViewHolder>(ModelClass.class, R.layout.design_row, MainActivity.BlogViewHolder.class, myRef) {
@Override
protected void populateViewHolder(MainActivity.BlogViewHolder viewHolder, ModelClass model, int position) {
viewHolder.setTitle(model.gettitle());
viewHolder.setImage(getApplicationContext(), model.getImage());
}
};
mRecyclerView.setAdapter(firebaseRecyclerAdapter);
}
public static class BlogViewHolder extends RecyclerView.ViewHolder {
View mView;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW,
Uri.parse("https://price-control-list-fca08.firebaseio.com/"));
Intent browserChooserIntent = Intent.createChooser(browserIntent, "Soghat");
v.getContext().startActivity(browserChooserIntent);
}
});
}
public void setTitle(String title) {
TextView post_title = (TextView) mView.findViewById(R.id.titleText);
post_title.setText(title);
}
public void setImage(Context ctx, String image) {
ImageView post_image = (ImageView) mView.findViewById(R.id.imageView);
Picasso.with(ctx).load(image).into(post_image);
}
}
答案 0 :(得分：0)
对于闪烁效果快速改变。而且这样做的代码在UI线程中花费的时间太长。
您可以使用bitmapImage.SetSourceAsync等待图像加载。
private async Task SetSourceAsync(Image image, Uri uri)
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
var file = await StorageFile.GetFileFromApplicationUriAsync(uri);
var bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(await file.OpenAsync(FileAccessMode.Read));
image.Source = bitmapImage;
});
}
您可以更改代码
image1.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM200.png",
UriKind.RelativeOrAbsolute));
image2.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM201.png",
UriKind.RelativeOrAbsolute));
image3.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM202.png",
UriKind.RelativeOrAbsolute));
image4.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM203.png",
UriKind.RelativeOrAbsolute));
image5.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM210.png",
UriKind.RelativeOrAbsolute));
image6.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM211.png",
UriKind.RelativeOrAbsolute));
image7.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM212.png",
UriKind.RelativeOrAbsolute));
image8.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM213.png",
UriKind.RelativeOrAbsolute));
image9.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM220.png",
UriKind.RelativeOrAbsolute));
image10.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM221.png",
UriKind.RelativeOrAbsolute));
image11.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM222.png",
UriKind.RelativeOrAbsolute));
image12.Source = new BitmapImage(new Uri("ms-appx:///Assets/OSM223.png",
UriKind.RelativeOrAbsolute));
收件人
private async void Replace_Click(object sender, RoutedEventArgs e)
{
await SetSourceAsync(image1, new Uri("ms-appx:///Assets/OSM200.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image2, new Uri("ms-appx:///Assets/OSM201.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image3, new Uri("ms-appx:///Assets/OSM202.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image4, new Uri("ms-appx:///Assets/OSM203.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image5, new Uri("ms-appx:///Assets/OSM210.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image6, new Uri("ms-appx:///Assets/OSM211.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image7, new Uri("ms-appx:///Assets/OSM212.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image8, new Uri("ms-appx:///Assets/OSM213.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image9, new Uri("ms-appx:///Assets/OSM220.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image10, new Uri("ms-appx:///Assets/OSM221.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image11, new Uri("ms-appx:///Assets/OSM222.png",
UriKind.RelativeOrAbsolute));
await SetSourceAsync(image12, new Uri("ms-appx:///Assets/OSM223.png",
UriKind.RelativeOrAbsolute));
}
但是当代码在某些较差的GPU中运行时，它总是闪烁。
我认为另一种方法是“隐藏并显示图像”或制作动画。
隐藏和显示方式是制作一些面板，以显示其中一个面板。
<StackPanel x:Name="custom">
<StackPanel Orientation="Horizontal">
<Image x:Name="image1" Height="200" Width="200" Source="ms-appx:///Assets/custom200.png"/>
<Image x:Name="image2" Height="200" Width="200" Source="ms-appx:///Assets/custom201.png"/>
<Image x:Name="image3" Height="200" Width="200" Source="ms-appx:///Assets/custom202.png"/>
<Image x:Name="image4" Height="200" Width="200" Source="ms-appx:///Assets/custom203.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image x:Name="image5" Height="200" Width="200" Source="ms-appx:///Assets/custom210.png"/>
<Image x:Name="image6" Height="200" Width="200" Source="ms-appx:///Assets/custom211.png"/>
<Image x:Name="image7" Height="200" Width="200" Source="ms-appx:///Assets/custom212.png"/>
<Image x:Name="image8" Height="200" Width="200" Source="ms-appx:///Assets/custom213.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image x:Name="image9" Height="200" Width="200" Source="ms-appx:///Assets/custom220.png"/>
<Image x:Name="image10" Height="200" Width="200" Source="ms-appx:///Assets/custom221.png"/>
<Image x:Name="image11" Height="200" Width="200" Source="ms-appx:///Assets/custom222.png"/>
<Image x:Name="image12" Height="200" Width="200" Source="ms-appx:///Assets/custom223.png"/>
</StackPanel>
</StackPanel>
<StackPanel x:Name="Osm" Visibility="Collapsed">
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM200.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM201.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM202.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM203.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM210.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM211.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM212.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM213.png"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM220.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM221.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM222.png"/>
<Image Height="200" Width="200" Source="ms-appx:///Assets/OSM223.png"/>
</StackPanel>
</StackPanel>
您可以编写一些按钮，然后单击
<StackPanel Orientation="Horizontal">
<Button Height="50" Width="150" HorizontalAlignment="Center" VerticalAlignment="Center"
Content="ReplaceCustom" Click="ShowCustom_OnClick" Margin="5"/>
<Button Height="50" Width="150" HorizontalAlignment="Center" VerticalAlignment="Center"
Content="Replace OSM" Click="ShowReplace_OnClick" Margin="5"/>
</StackPanel>
单击按钮时可以显示面板。
private void ShowCustom_OnClick(object sender, RoutedEventArgs e)
{
custom.Visibility = Visibility.Visible;
Osm.Visibility = Visibility.Collapsed;
}
private void ShowReplace_OnClick(object sender, RoutedEventArgs e)
{
custom.Visibility = Visibility.Collapsed;
Osm.Visibility = Visibility.Visible;
}