无法在 Android Studio 中解析符号 HttpGet、HttpClient、HttpResponce [英] Cannot resolve symbol HttpGet,HttpClient,HttpResponce in Android Studio

问题描述

我只是复制了 Http 的所有 jar 文件，但是 Android Studio 无法导入所有这些 jar 文件.它给出了一个错误:无法解析符号 HttpGet,HttpClient,HttpResponse.

I just copy all the jar files of Http but Android Studio cann't import all these jar files.It gives an error : Cannot resolve symbol HttpGet,HttpClient,HttpResponse.

我的 Activity 文件在这里:-

My Activity file is here:-

public class MainActivity extends AppCompatActivity {

ArrayList<Product>  productslist;
ProductAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    productslist = new ArrayList<Product>();
    new JSONAsyncTask().execute("http://opencart.codeniques.com/myshop/?route=feed/web_api/products&id=60&key=test123");

    ListView listView = (ListView)findViewById(R.id.list);
    adapter = new ProductAdapter(getApplicationContext(),R.layout.row,productslist);

    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getApplicationContext(),productslist.get(position).getName(),Toast.LENGTH_LONG).show();
        }
    });
}

class JSONAsyncTask extends AsyncTask<String,Void,Boolean>{

    ProgressDialog dialog;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        dialog = new ProgressDialog(MainActivity.this);
        dialog.setMessage("Loading, please wait");
        dialog.setTitle("Connecting server");
        dialog.show();
        dialog.setCancelable(false);
    }

    @Override
    protected Boolean doInBackground(String... params) {
        try{
            HttpGet httppost = new HttpGet(params[0]);
            HttpClient httpclient = new DefaultHttpClient();
            HttpResponse response = httpclient.execute(httppost);

            int status = response.getStatusLine().getStatusCode();

            if(status == 200){
                HttpEntity entity = response.getEntity();
                String data = EntityUtils.toString(entity);

                JSONObject jsono = new JSONObject(data);
                JSONArray jarray = jsono.getJSONArray("products");

                for (int i = 0; i < jarray.length(); i++) {
                    JSONObject object = jarray.getJSONObject(i);

                    Product actor = new Product();

                    actor.setId(object.getString("id"));
                    actor.setName(object.getString("name"));
                    actor.setDescription(object.getString("description"));
                    actor.setHref(object.getString("href"));
                    actor.setPrice(object.getString("pirce"));
                    actor.setImage(object.getString("thumb"));
                    actor.setSpecial(object.getString("special"));
                    actor.setRating(object.getString("rating"));

                    productslist.add(actor);
            }
                return  true;
            }
        }catch (JSONException e){
            Log.e("Error :",e.getMessage());
        }catch (ParseException e){
            Log.e("Error :",e.getMessage());
        }catch (IOException e){
            Log.e("Error :",e.getMessage());
        }catch (Exception e){
            Log.e("Error :",e.getMessage());
        }
        return  false;
    }
    @Override
    protected void onPostExecute(Boolean aBoolean) {
        dialog.cancel();
        adapter.notifyDataSetChanged();
        if(aBoolean == false){
            Toast.makeText(getApplicationContext(), "Unable to fetch data from server", Toast.LENGTH_LONG).show();
        }
    }
}}

这里是我的 gradle 在这里:-

and here my gradle is here:-

apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "22.0.1"

defaultConfig {
    applicationId "android.catalyst.com.newjsonarray"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }}}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])

testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'com.android.support:design:23.0.1'}

推荐答案

只需将其添加到您的依赖项

compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'

终于

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])    
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'com.android.support:design:23.0.1'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'
}

并添加以下代码:

 android {
    useLibrary 'org.apache.http.legacy'
         }

仅供参考

指定对 Apache HTTP Legacy 库的要求如果您的应用程序是针对 API 级别 28 (Android 9.0) 或更高版本，您必须包含元素中的以下声明AndroidManifest.xml.

Specify requirement for Apache HTTP Legacy library If your app is targeting API level 28 (Android 9.0) or above, you must include the following declaration within the element of AndroidManifest.xml.

 <uses-library
      android:name="org.apache.http.legacy"
      android:required="false" />

这篇关于无法在 Android Studio 中解析符号 HttpGet、HttpClient、HttpResponce的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！