android如何使验证url从改装可用

Question

为了检查youtube url是否可用，我使用了改装，它工作得很好，但我想用它来验证我被卡住了，这是我的代码：

CheckUrlHelper.java

private static final String BASE_URL= "https://youtu.be/";    
public void CheckUrl(String youtube_id)
{
retrofit=new Retrofit.Builder().baseUrl(BASE_URL+youtube_id).build();

Call<ResponseBody> call= retrofit.create(CheckUrlAvailable.class).checkUrl();
call.enqueue(new Callback<ResponseBody>()
{
@Override
public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
//Log.d("","response : "+response);
if(response.code() == 200)
{
result = "true";
}
else
{
result = "false";               
}
}

@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
result = "false";
}
});
listener.getResult(result);
}

public interface callbackListener {
void getResult(String result);
}

我尝试过使用上面类似接口的代码，但导致了错误。

我的期望是：得到结果(如果可能从代码中得到结果，无论是200、500还是其他(，那么：

MyClass.java

private String error_message;
public void onClick(View v) {
String video_link = editVideoLink.getText().toString();
CheckUrlHelper curl = new CheckUrlHelper();

/* MY Expectation */

if(curl.CheckUrl(video_link) == 200){
Toast.makeText(getActivity(),"url available",Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(),"url not available",Toast.LENGTH_SHORT).show();
}
/**** Edit ****/
String video_link = editVideoLink.getText().toString();
if(TextUtils.is_empty(video_link){
error_message = "Link cannot be empty";
} else if(/* methodNamewhatever(video_link) == false*/ OR /* methodNamewhatever(video_link) == 404*/){
error_message = "Invalid Link";
}else{
// save
}
Toast.makeText(getActivity(),error_message,Toast.LENGTH_SHORT).show();

因此，当用户将youtube id放在editText上，然后单击提交时，可以将结果作为验证。

请帮我

感谢

Answer 1

好吧，您放错了侦听器的位置。您不需要从所有函数中调用它，而是需要在每个方法中调用它一次，以便在onResponse和onFailure回调中触发响应后获得结果。

所以你必须把你的代码改成这样

private static final String BASE_URL= "https://youtu.be/";
public void CheckUrl(String youtube_id, callbackListener listener)
{
retrofit = new Retrofit.Builder().baseUrl(BASE_URL+youtube_id).build();
Boolean result = false;
Call<ResponseBody> call= retrofit.create(CheckUrlAvailable.class).checkUrl();
call.enqueue(new Callback<ResponseBody>()
{
@Override
public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
//Log.d("","response : "+response);
if(response.code() == 200)
{
result = true;
}
else
{
result = false;
}
listener.getResult(result);
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
result = false;
listener.getResult(result);
}
});

}
public interface callbackListener {
void getResult(Boolean result);
}

Answer 2

我为您创建了一些代码片段，只是为了解决您的问题。

CheckUrlHelper.java

private static final String BASE_URL= "https://youtu.be/";
public void CheckUrl(String youtube_id, callbackListener listener)
{
retrofit = new Retrofit.Builder().baseUrl(BASE_URL+youtube_id).build();
Boolean result = false;
Call<ResponseBody> call= retrofit.create(CheckUrlAvailable.class).checkUrl();
call.enqueue(new Callback<ResponseBody>()
{
@Override
public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
//Log.d("","response : "+response);
if(response.code() == 200)
{
result = true;
}
else
{
result = false;
}
listener.getResult(result);
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
result = false;
listener.getResult(result);
}
});

}
public interface callbackListener {
void getResult(Boolean result);
}

并在中修改您的点击代码

MyClass.java

public void onClick(View v) {
String video_link = editVideoLink.getText().toString();
CheckUrlHelper curl = new CheckUrlHelper();
//curl.CheckUrl(video_link);
curl.CheckUrl(video_link, new callbackListener() {
@Override
public void getResult(Boolean result) {
if(result){
Toast.makeText(getActivity(),"url available",Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(),"url not available",Toast.LENGTH_SHORT).show();
}
}
});

希望这能解决你的问题。