"java.io"パッケージをインポートする際にエラーが発生する

Question

SDKにSDKが組み込まれていないという問題がある場合は、その後、Eclipseにパッケージを追加する方法を教えてください。

以下は私のコード

package coin.asiannews; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 
import java.util.ArrayList; 
import java.util.Random; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.AlertDialog; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.content.res.Configuration; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.preference.PreferenceManager; 
import android.support.v7.app.ActionBarDrawerToggle; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBarActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.FrameLayout; 
import android.widget.ListView; 

import coin.asiannews.utils.ShakeDetector; 
import coin.asiannews.utils.ShakeDetector.OnShakeListener; 

/** Extend from this Activity to display the navigation drawer on the left side 
* 
* @author Pixelart Web and App Development 
*/ 
public class BaseActivity extends ActionBarActivity{ 

    DrawerLayout mDrawerLayout; 
    View devi; 
    ListView mDrawerList; 
    ActionBarDrawerToggle mDrawerToggle; 
    protected FrameLayout contentLayout; 
    int id = 0; 
    ArrayList<String> idList; 
    AlertDialog ad; 
    boolean isTablet = false; 

    /** Set The ContentView and the position in the menu list 
    * 
    * @param layoutResID 
    * @param position 
    */ 
    public void setContentView(final int layoutResID, int id) { 
     this.id = id; 
     devi = (View) getLayoutInflater().inflate(R.layout.activity_base, null); 

     Toolbar toolbar = (Toolbar) devi.findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     mDrawerLayout= (DrawerLayout) devi.findViewById(R.id.drawer_layout); 
     contentLayout= (FrameLayout) devi.findViewById(R.id.content_frame); 
     getLayoutInflater().inflate(layoutResID, contentLayout, true); 
     super.setContentView(devi); 

     // Set this to true to display an icon or logo 
     getSupportActionBar().setDisplayShowHomeEnabled(true); 
     // Set this to false to hide text title 
     getSupportActionBar().setDisplayShowTitleEnabled(true); 

     if(((ViewGroup.MarginLayoutParams)contentLayout.getLayoutParams()).leftMargin == 240) { 
      isTablet = true; 
      supportInvalidateOptionsMenu(); 
     }else { 
      isTablet = false; 
      supportInvalidateOptionsMenu(); 
     } 

     if(isTablet) { 
      mDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN); 
      mDrawerLayout.setScrimColor(getResources().getColor(R.color.transparent)); 
      getSupportActionBar().setDisplayHomeAsUpEnabled(false); 
      getSupportActionBar().setHomeButtonEnabled(false); 

     }else if(!isTablet) { 
      getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
      getSupportActionBar().setHomeButtonEnabled(true); 
      mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START); 
      mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.drawer_open, 
        R.string.drawer_close) { 

       public void onDrawerClosed(View view) { 
        supportInvalidateOptionsMenu(); 
       } 

       public void onDrawerOpened(View drawerView) { 
        supportInvalidateOptionsMenu(); 
       } 
      }; 

      mDrawerLayout.setDrawerListener(mDrawerToggle); 
      mDrawerToggle.setDrawerIndicatorEnabled(true); 
     } 

     mDrawerList = (ListView) findViewById(R.id.left_drawer); 
     String[] menu = getResources().getStringArray(R.array.menu); 
     mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.row_drawer_menu, menu)); 
     mDrawerList.setOnItemClickListener(new DrawerItemClickListener()); 
     mDrawerList.setItemChecked(id, true); 

     SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(BaseActivity.this); 
     if(pref.getBoolean("isDeviceShake", true) == true){ 
      ShakeDetector.create(this, new OnShakeListener() { 
       public void OnShake() { 
         randomPost(); 
       } 
      }); 
     } 

    } 

    public void setItemChecked() { 
     mDrawerList.setItemChecked(id, true); 
    } 

    @Override 
    public void onResume(){ 
     super.onResume(); 
     ShakeDetector.start(); 
     mDrawerList.setItemChecked(id, true); 
    } 

    @Override 
    protected void onStop() { 
     super.onStop(); 
     ShakeDetector.stop(); 
    } 

    @Override 
    protected void onDestroy() { 
     super.onDestroy(); 
     ShakeDetector.destroy(); 
    } 

    public void displayDrawerToggle(boolean ddt) { 
     if(ddt) { 
      mDrawerToggle.setDrawerIndicatorEnabled(true); 
     }else if(!ddt) { 
      mDrawerToggle.setDrawerIndicatorEnabled(false); 
     } 
    } 

    @Override 
    protected void onPostCreate(Bundle savedInstanceState) { 
     super.onPostCreate(savedInstanceState); 
     if(!isTablet) { 
      mDrawerToggle.syncState(); 
     } 
    } 

    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     if(!isTablet) { 
      mDrawerToggle.onConfigurationChanged(newConfig); 
     } 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     if (!isTablet && mDrawerToggle.onOptionsItemSelected(item)) { 
      return true; 
     } 
     return true; 
    } 

    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     return true; 
    } 

    private class DrawerItemClickListener implements ListView.OnItemClickListener { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      switch (position) { 

      case 0: 
       Intent latest = new Intent(BaseActivity.this, LatestPosts.class); 
       startActivity(latest); 
       if(!isTablet) { 
        mDrawerLayout.closeDrawer(mDrawerList); 
       } 
       break; 
      case 1: 
       Intent categories = new Intent(BaseActivity.this, CategoriesIndex.class); 
       startActivity(categories); 
       if(!isTablet) { 
        mDrawerLayout.closeDrawer(mDrawerList); 
       } 
       break; 
      case 2: 
       Intent page = new Intent(BaseActivity.this, PageActivity.class); 
       startActivity(page); 
       if(!isTablet) { 
        mDrawerLayout.closeDrawer(mDrawerList); 
       } 
       break; 
      case 3: 
       Intent bookmarks = new Intent(BaseActivity.this, BookmarkPosts.class); 
       startActivity(bookmarks); 
       if(!isTablet) { 
        mDrawerLayout.closeDrawer(mDrawerList); 
       } 
       break; 
      case 4: 
       Intent settings = new Intent(BaseActivity.this, SettingsActivity.class); 
       startActivity(settings); 
       if(!isTablet) { 
        mDrawerLayout.closeDrawer(mDrawerList); 
       } 
       break; 
      } 
     } };  


    /** 
    * RANDOM POST FUNCTIONS 
    */ 
    private void randomPost() { 
     LayoutInflater inflater = getLayoutInflater(); 
     View dialoglayout = inflater.inflate(R.layout.dialog_shake, null); 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setView(dialoglayout); 
     ad = builder.create(); 
     ad.show(); 

     String param = "/get_posts/?include=id&count=999999"; 
     String api = getString(R.string.api); 
     String url = getString(R.string.blogurl); 

     url = url+api+param; 
     new GetIdsTask().execute(url); 
    } 

    private class GetIdsTask extends AsyncTask<String, Integer, Void> { 

     @Override 
     protected void onProgressUpdate(Integer... values) { 
     } 

     @Override 
     protected void onPostExecute(Void result) { 
      if (null != idList) { 
       Random r = new Random(); 
       int index = r.nextInt(idList.size()); 
       String pId = idList.get(index); 
       fetchPost(pId); 
      } 
     } 

     @Override 
     protected Void doInBackground(String... params) { 
      String url = params[0]; 
      JSONObject json = getJSONFromUrl(url); 

      try { 

       if (json.getString("status").equalsIgnoreCase("ok")) { 
        JSONArray posts = json.getJSONArray("posts"); 

        idList = new ArrayList<String>(); 

        for (int i = 0; i < posts.length(); i++) { 
         JSONObject post = (JSONObject) posts.getJSONObject(i); 
         String id = post.getString("id"); 

         idList.add(id); 
        } 
       } 
       } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 
    } 

    public JSONObject getJSONFromUrl(String url) { 
     InputStream is = null; 
     JSONObject jObj = null; 
     String json = null; 

     try { 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 

      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "iso-8859-1"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      jObj = new JSONObject(json); 
     } catch (JSONException e) {} 

     return jObj; 
    } 

    private void fetchPost(String id) { 
     String url = getString(R.string.blogurl); 
     String api = getString(R.string.api); 
     String include = getString(R.string.include); 
     String param = "/get_post/?id="+id+"&include="+include; 

     url = url+api+param; 
     new GetPostTask().execute(url); 
    } 

    private class GetPostTask extends AsyncTask<String, Integer, Void> { 

     String[] postData; 

     @Override 
     protected void onProgressUpdate(Integer... values) { 
     } 

     @Override 
     protected void onPostExecute(Void result) {   
      Intent intent = new Intent(BaseActivity.this, PostDetails.class); 
      intent.putExtra("post_url", postData[0]); 
      intent.putExtra("post_title", postData[1]); 
      intent.putExtra("post_id", postData[2]); 
      intent.putExtra("post_com_status", postData[3]); 
      intent.putExtra("post_author", postData[4]); 
      startActivity(intent); 

      ad.cancel();  
     } 

     @Override 
     protected Void doInBackground(String... params) { 
      String url = params[0]; 
      JSONObject json = getJSONFromUrl(url); 

      try { 

       if (json.getString("status").equalsIgnoreCase("ok")) { 
        JSONObject post = json.getJSONObject("post"); 
         String id = post.getString("id"); 
         String title = post.getString("title"); 
         String uri = post.getString("url"); 
         String com_status = post.getString("comment_status"); 

         JSONObject aut = post.getJSONObject("author"); 
         String author = aut.getString("name"); 

         String[] postData = { uri, title, id, com_status, author, }; 
         this.postData = postData; 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 
    } 
} 

この問題のためにresonを見つけることができない、IOパッケージのインポート中に、私はこのエラーを取得しています。どんな助けでも大きな価値があります。

- ありがとう！

Answer 1

確認Eclipse設定：

のJava - > [インストール済みのJRE。あなたが使用しているものにはマークを付けるべきであり、JREだけでなくJDKでなければなりません。

また、プロジェクトのビルド・パスを確認します

は、プロジェクトを右クリック - >プロパティ - > Javaビルド・パスのチェックを に「ライブラリ」は追加しない場合は、JREシステム・ライブラリーが存在し、 であるかどうかをフォルダ「ライブラリの追加」 - >「JREシステムライブラリ」を使用して、 （インストールされたJDKから）正しいものを選択します。