Start ListActivity mit Absicht von Hauptaktivität und Fehler finden, haben Sie diese Aktivität in Ihrem AndroidManifest.xml

Question

Code deklariert.

public class Season extends ListActivity { 
     private DataBaseHelper db; 
     private String[] Name; 
     private String[] Teedad; 
     private ListView listView; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       setContentView(R.layout.season); 
       db = new DataBaseHelper(this); 

       refresher(); 
       setListAdapter(new AA()); 
      listView=(ListView)findViewById(R.id.list); 

       } 
     class AA extends ArrayAdapter<String>{ 

      public AA(){ 
       super(Season.this,R.layout.raw_season,Name); 

      } 
      @Override 
      public View getView(int position, View convertView, ViewGroup parent) { 
       LayoutInflater in = getLayoutInflater(); 
       View row = in.inflate(R.layout.raw_season, parent,false); 

       TextView name = (TextView) row.findViewById(R.id.name_season); 
       TextView teedad = (TextView) row.findViewById(R.id.teedad_dastan); 

       name.setText(Name [position]); 
       teedad.setText(Teedad [position]); 
       return (row); 
      } 
} 
     } 
    private void refresher(){ 
     db.openDataBase(); 
     int save = db.shomaresh_field("datastorys", "season"); 
     Name = new String[save]; 
     Teedad = new String[save]; 
     for (int i = 0; i <save; i++) { 
      Name[i] = db.namayesh_fasl("datastorys", i); 
      Teedad[i] = db.shomaresh_dastan("datastorys", Name[i].toString())+""; 
     } 
     db.close(); 
    } 
} 

Manifest.

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

     <application 
      android:allowBackup="true" 
      android:icon="@mipmap/ic_launcher" 
      android:label="@string/app_name" 
      android:supportsRtl="true" 
      android:theme="@style/AppTheme"> 
      <activity android:name="com.example.farhad.bookdb.MainActivity"> 
       <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 
        <category android:name="android.intent.category.LAUNCHER" /> 
       </intent-filter> 
      </activity> 
      <activity 
       android:name="com.example.farhad.bookdb.Season">#I think, Is there any problem?# 
      </activity> 
     </application> 
    </manifest> 

Xml.

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent"> 
     <ListView 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_weight="1" 
      android:drawSelectorOnTop="false" 
      android:id="@+id/list" />#I define here list# 
    </RelativeLayout> 

MainActivity-Code

public class MainActivity extends Activity { 

     Button btn; 
     Cursor c = null; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 
      btn = (Button)findViewById(R.id.btn); 
      btn.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 

        DataBaseHelper myDbHelper = new DataBaseHelper(MainActivity.this); 
        try { 
         myDbHelper.createDataBase(); 
        } catch (IOException ioe) { 
         throw new Error("Unable to create database"); 
        } 
        try { 
         myDbHelper.openDataBase(); 
         Intent intent = new  Intent(MainActivity.this,Season.class); 
         startActivity(intent); 

        } catch (SQLException sqle) { 
         throw sqle; 
        } 
       } 
      }); 
     } 
    } 

1. [1]: FATAL ERROR : main have you declared this activity in your AndroidManifest.xml?

   FATAL ERROR : main have you declared this activity in your AndroidManifest.xml?

   Android Studio: Unable to find explicit activity class have you declared this activity in your AndroidManifest.xml

Blockquote Ich habe zwei Tage auf dieser Anwendung arbeiten, aber es gibt ein Problem, das zu verwechseln. Ich habe die meiste Post darüber gelesen, aber ich konnte es nicht lösen, bitte hilf mir.

Answer 1

Beim Erstellen von Listview mit ListActivity müssen zwei Dinge ein ListView mit dem Attribut android: id auf @android: id/list (NICHT android: id = "@ + id/list") enthalten.

Wenn Sie ListView mit dem Attribut android: id auf @ + ID/Liste festgelegt definieren, wird ein Fehler ausgegeben.

Answer 2

Versuchen Sie einfach dies.

<activity 
      android:name=".Season"/> 

statt,

<activity 
      android:name="com.example.farhad.bookdb.Season"/> 

Dies kann helfen Ihnen.