Question

我想要android：可见性根据返回的布尔值在xml布局中解析。像android：visibility =“card.isPrimary（）？1：0”。

Android文档显示可见，不可见和不存在的是0,1,2。我的理解是真的/ 1会解析为隐形，而假/ 0会变为可见。

布局：

 <LinearLayout>

    <ImageView
        android:visibility="@{ creditCard.isPrimary()}"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:src= "@drawable/creditcard" />

</LinearLayout>

Answer 1

然后，isPrimary（）应该返回相应的可见性值

NSString *token = [tokenData objectForKey:@"access_token"];
NSString *tokenType = [tokenData objectForKey:@"token_type"];

NSString *header = [NSString stringWithFormat:@"%@ %@", tokenType, token];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"https://api.spotify.com/v1/search?%@",trackId]];

[request setValue:header forHTTPHeaderField:@"Authorization"];
[request setURL:url];

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
  [[session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    if (!error) {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        // JSON with song is here
    }
}] resume];

android visiblity - 保留图像视图的空间

1 个答案: