如何從ListView中的單元格中提取文本

Question

我在MainActivity中創建了一個Student類和一個ListView。這裏是MainActivity：

Context context; 
ListView listView; 
ArrayList<Student> lista; 

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

    lista= new ArrayList<>(); 
    context=this; 
    Student cursant = new Student("Smith","Ben",14); 
    Student cursant2 = new Student("White","Jack",21); 
    Student cursant3 = new Student("Stewart","Matt",33); 
    lista.add(cursant); 
    lista.add(cursant2); 
    lista.add(cursant3); 
    listView=(ListView) findViewById(R.id.listview); 
    listView.setAdapter(new CustomAdapter(this,R.layout.activity_main,lista)); 

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
      Intent i = new Intent(MainActivity.this,Main2Activity.class); 
      String selected =((TextView)view.findViewById(R.id.textViewNume)).getText().toString(); 
      i.putExtra("name",selected); 
      startActivity(i); 
     } 
    }); 
} 

這裏是我的CustomAdapter：

public class CustomAdapter extends ArrayAdapter<Student> { 
ArrayList<Student> current_objects; 
Context context; 
private static LayoutInflater inflater=null; 
public CustomAdapter(Context context, int resource, ArrayList<Student> objects) { 
    super(context, resource, objects); 
    this.current_objects=objects; 
    inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 

@Override 
public int getCount() { 
    return current_objects.size(); 
} 

@Override 
public Student getItem(int position) { 
    return current_objects.get(position); 
} 

@Override 
public long getItemId(int position) { 
    return 0; 
} 

public class Holder{ 
    TextView tv1,tv2,tv3; 
    Button button; 
} 

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    Holder holder = new Holder(); 
    final View rowView; 
    rowView=inflater.inflate(R.layout.item,null); 
    holder.tv1=(TextView) rowView.findViewById(R.id.textViewNume); 
    holder.tv2=(TextView) rowView.findViewById(R.id.textViewPrenume); 
    holder.tv3=(TextView) rowView.findViewById(R.id.textViewVarsta); 

    final Student current_cursant = current_objects.get(position); 
    holder.tv1.setText(current_cursant.getNume()); 
    holder.tv2.setText(current_cursant.getPrenume()); 
    holder.tv3.setText(String.valueOf(current_cursant.getVarsta())); 

    holder.button=(Button) rowView.findViewById(R.id.button); 
    holder.button.setTag(position); 

    holder.button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      Integer index=(Integer)v.getTag(); 
      current_objects.remove(index.intValue()); 
      notifyDataSetChanged(); 
     } 
    }); 

    return rowView; 
} 

}

我創建Main2Activity，我想顯示的名稱（在Main2Activity）時，列表視圖中的一個細胞按下。我不確定ClickListener。

Answer 1

首先嚐試這種：

listView.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, 
        long id) { 

       String item = ((TextView)view).getText().toString(); 

       Toast.makeText(getBaseContext(), item, Toast.LENGTH_LONG).show(); 

      } 
     }); 

如果這是給你正確的結果，那麼只需添加意向代碼替換吐司聲明。

Answer 2

您的onItemClick部分似乎是正確的，所以我想問題必須在如何顯示Main2Activity上的文本。

您已經通過了該意圖並啓動了Main2Activity。

現在你只需要接收意圖並顯示它。

假設你有Main2Activiy與ID textView1一個TextView那麼您將收到意向如下：

Bundle extras = getIntent().getExtras(); 
     if (extras == null) { 
      return; 
     } 

     String name= extras.getString("name"); 

     TextView textView = (TextView) 
       findViewById(R.id.textView1);  
     textView.setText(name); 

Answer 3

這會爲你工作：佈局也

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
    @Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     Student student = (Student)parent.getItemAtPosition(position); 
     // do whatever you want with student object 
    } 
});