在多个对象上添加onclick

时间:2011-05-30 22:15:49

标签: android layout

我为我的数据库中的每个名称创建一个按钮,然后我应该在此按钮添加一个onclick函数,但我不知道id使用了什么。我用 ???在代码中用于指示位置

public class Game extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.game);

    ListView playersList=(ListView)findViewById(R.id.playersList);

    MyDb db=new MyDb(getApplicationContext());
    db.open();

    Cursor c=db.fetchAllUsers();
    startManagingCursor(c);

    SimpleCursorAdapter adapter=new SimpleCursorAdapter( 
            this,
            R.layout.user,
            c,
            new String[]{MyDb.UsersMetaData.USERS_NAME},
            new int[]{R.id.namePlayer}
    );

    playersList.setAdapter(adapter);
    db.close();

    Button newUser;
    newUser = (Button)findViewById(R.id.buttonNew);
    newUser.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            MyDb db=new MyDb(getApplicationContext());
            db.open();
            EditText inserted = (EditText)findViewById(R.id.editName);
            String nome = inserted.getText().toString();
            db.insertUser(nome);
            db.close();
        }
    });

    Button chosen;
    chosen = (Button)findViewById(R.id.???);
    chosen.setOnClickListener(new View.OnClickListener() {
        public void onClick(View view) {
            Intent myIntent = new Intent(view.getContext(), Game2.class);
            startActivityForResult(myIntent, 0);
            finish();
        }
    });
    }

}

用户界面

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/sfondo"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:background="@drawable/sfondo">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">  

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"> 

            <EditText
                android:id="@+id/editName"
                android:text="@string/editName"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:lines="1"
                android:width="180px" />
        <Button
                android:text="@string/newPlayer"
                android:id="@+id/buttonNew"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:minWidth="70px" />
        </LinearLayout>
        <ListView
            android:id="@+id/playersList"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </LinearLayout>
</FrameLayout>

db元素的xml

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

    <Button
        android:id="@+id/namePlayer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:minWidth="250px" />
</LinearLayout>

感谢

2 个答案:

答案 0 :(得分:1)

所以按钮在R.layout.user?如果是这样,我认为您可能需要扩展SimpleCursorAdapter,并且在getView()方法中,您可以找到视图并添加侦听器。像这样:

public class MyCursorAdapter extends SimpleCursorAdapter {
    public MyCursorAdapter(...) {
        super(...);
    }

    public void getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);

        Button button = (Button) view.findViewById(R.id.???);
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
                ...
            }
        });
    }
}

这样你的'find'就会限定在列表中的一行。您无法在当前拥有代码的位置添加侦听器,因为将有多个具有相同ID的视图。

答案 1 :(得分:1)

要将onClick定义为多个对象,您的类应实现接口OnClickListener,并覆盖方法onClick(View v),如下所示:

public class MyActivity extends Activity implements OnClickListener{
@Override
public void onCreate(Bundle savedInstance){
....
//add listeners to your buttons 
btn1.setOnClikListener(this);
btn2.setOnClickListener(this);
....
}

@Override
public void onClick(View v ) {

if(v==btn1)
   // treatement 1 
if(v== btn2)
   //treatment 2 
...etc 
}