我々はListView項目をクリックすると新しい活動を開始するには、私は私がプログラムを実行するとitem.Butが、私はのようないくつかのエラーを取得していますリストビューをクリックすると、活動を開始しようとしています

Question

：

Error:(45, 43) error: no suitable constructor found for Intent(,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; cannot be converted to Context) Error:(51, 44) error: no suitable constructor found for Intent(,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; cannot be converted to Context) Error:(57, 43) error: no suitable constructor found for Intent(,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; cannot be converted to Context) Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

Menu.java パブリッククラスメニューAppCompatActivity

activity_menu.xml {

ListView lv; 

    private static String[] menu_list = { "list one", "list 2", "list 3" }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_menu); 
     listview(); 
    } 

    public void listview() { 
     lv = (ListView) findViewById(R.id.lv_Menu_List); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
       R.layout.list_layout, menu_list); 
     lv.setAdapter(adapter); 
     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 

       // String value =(String)lv.getItemAtPosition(position); 

       if (position == 0) { 
        Intent intent = new Intent(this, ListOne.class); 
        startActivity(intent); 
       } else if (position == 1) { 
        Intent intent = new Intent(this, List2.class); 
        startActivity(intent); 
       } else if (position == 2) { 
        Intent intent = new Intent(this, List3.class); 
        startActivity(intent); 
       } 

      } 
     }); 
    } 
} 

を拡張

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.examplemenu.Menu"> <ListView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lv_Menu_List" android:layout_centerHorizontal="true" android:layout_alignParentTop="true" /> </RelativeLayout> 

list_layout.xml

<xml version="1.0" encoding="utf-8"?> 
    <TextView xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:paddingBottom="@dimen/activity_vertical_margin" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     android:soundEffectsEnabled="true"> 
</TextView> 

Answer 1

はこれを試してみてください：ちょうどthisはAdapterView.OnItemClickListenerないMenuクラスを参照

Intent intent=new Intent(Menu.this,ListOne.class); 
startActivity(intent); 

ので。

Answer 2

あなたはそれが役に立てば幸い、Menu.thisまたはgetApplicationContext()（両方の作品を）使用することができます！

public void listview() 
    { 
     lv=(ListView)findViewById(R.id.lv_Menu_List); 
     ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,R.layout.list_layout,menu_list); 
     lv.setAdapter(adapter); 
     lv.setOnItemClickListener(
       new AdapterView.OnItemClickListener() { 
        @Override 
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

        //String value =(String)lv.getItemAtPosition(position); 

        if(position==0){ 
         Intent intent=new Intent(getApplicationContext(),ListOne.class); 
         startActivity(intent); 
        } 
        else { 
         if (position == 1) { 
          Intent intent = new Intent(Menu.this, List2.class); 
          startActivity(intent); 

         } else if (position == 2) { 
          Intent intent = new Intent(Menu.this, List3.class); 
          startActivity(intent); 
         } 
        } 
       } 
      }); 
}