Android Studio RssFeed

Question

我正在用android studio編寫rssfeed我正在使用模擬器。我的代碼編譯並啓動，但除了頂部的標題MyRssFeed之外，它不顯示任何內容。有什麼我失蹤？

類：

package jrodriguez.myrssfeed; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.util.Log; 
import android.view.View; 
import android.widget.TextView; 
import java.io.BufferedReader; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 

/** 
* Created by Jennifer Rodriguez on 3/8/2016. 
*/ 
public class MainActivity extends AppCompatActivity { 
private TextView src; 


protected void OnCreate(Bundle SavedInstanceState) { 
    super.onCreate(SavedInstanceState); 
    setContentView(R.layout.activity_main); 
    src = (TextView) findViewById(R.id.text); 
} 

public void fetch(View v) { 
    Downloader d = new Downloader(); 
    d.execute("https://en.wikipedia.org/wiki/Main_Page"); 
    try { 
     src.setText(d.get()); 

    } catch (Exception e) { 
     Log.e("Error to thread", e.toString()); 
    } 
} 

class Downloader extends AsyncTask<String, Void, String> { 
    @Override 
    protected String doInBackground(String... urls) { 
     String result = null; 
     try { 
      URL url = new URL(urls[0]); 
      HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
      InputStream in = conn.getInputStream(); 
      BufferedReader reader = new BufferedReader(new InputStreamReader(in)); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       result = result + line; 
      } 
      conn.disconnect(); 
      reader.close(); 
     } catch (Exception e) { 
      Log.e("error to fetching", e.toString()); 
     } 
     return result; 
    } 


} 

XML文件

<?xml version="1.0" encoding="utf-8"?> 
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res 
/android" 
android:orientation="vertical" android:layout_width="match_parent" 
android:layout_height="match_parent"> 

    <TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="Large Text" 
    android:id="@+id/text" 
    android:enabled="true" /> 

    <Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/Fetch" 
    android:id="@+id/Fetch" 
    android:enabled="true" 
    android:clickable="true" /> 
    </LinearLayout> 

清單

<?xml version="1.0" encoding="utf-8"?> 
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="jrodriguez.myrssfeed"> 

    <application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 
      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
     </activity> 
    <uses-permissions android:name="android.permission.INTERNET" /> 
    </application> 
    </manifest> 

Answer 1

你需要做的FOL低落的變化。

Button btn; 

protected void OnCreate(Bundle SavedInstanceState) { 
    super.onCreate(SavedInstanceState); 
    setContentView(R.layout.activity_main); 
    src = (TextView) findViewById(R.id.text); 
    btn = (Button) findViewById(R.id.Fetch); 
    btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
         fetch(); 
      } 
     }); 
} 

public void fetch() { 
// 
}