Cannot resolve symbol HttpGet,HttpClient,HttpRespo

问题:

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.

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();
        }
    }
}}

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'}

回答1:

Just add this in your dependencies

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

Finally

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'
}

And also add this code:

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

FYI

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" />

回答2:

HttpClient is not supported any more in sdk 23. You have to use URLConnection or downgrade to sdk 22 (compile 'com.android.support:appcompat-v7:22.2.0')

If you need sdk 23, add this to your gradle:

In dependencies add:

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

and also add this

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

回答3:

HttpClient was deprecated in API Level 22 and removed in API Level 23. You have to use URLConnection.

回答4:

Please remove all jar files of Http from libs folder and add below dependencies in gradle file :

compile 'org.apache.httpcomponents:httpclient:4.5'
compile 'org.apache.httpcomponents:httpcore:4.4.3'

Thanks.

回答5:

please add these codes to your dependencies. It will work.

implementation 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    implementation 'com.android.support:appcompat-v7:23.1.0'
    implementation 'com.android.support:design:23.1.0'
    implementation 'com.android.support:cardview-v7:23.1.0'
    implementation 'com.android.support:recyclerview-v7:23.1.0'

    implementation 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
}

回答6:

Google officially suggests to developers to use Volley library for networking related stuff Here, so Its time to switch to Volley, Happy coding

回答7:

Please remove all jar files of Http from 'libs' folder and add below dependencies in gradle file:

compile 'org.apache.httpcomponents:httpclient:4.5'
compile 'org.apache.httpcomponents:httpcore:4.4.3'

or

useLibrary 'org.apache.http.legacy'

回答8:

You just rebuilt your project

compile fileTree(dir: 'libs', include: ['*.jar'])

回答9:

That is just in SDK 23, Httpclient and others are deprecated. You can correct it by changing the target SDK version like below:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "vahid.hoseini.com.testclient"
        minSdkVersion 10
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),    'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.1.1'
}

回答10:

For me, the below helped

Find org.apache.http.legacy.jar which is in Android/Sdk/platforms/android-23/optional, add it to your dependency.

Source

回答11:

adding this worked for me.

compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'