Dùng popup hiển thị hoặc lấy thông tin

Ta có thể dùng Dialog để lấy thông tin từ người dùng, cũng có thể dùng popup như sau.

Tại thư mục drawable, tạo một file tên popup_background.xml

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:state_above_anchor="true" android:drawable="@drawable/speech_background_top" />

    <item android:drawable="@drawable/speech_background_bottom" />

</selector>

Copy vào drawable 2 icon sau với tên speech_background_top, speech_background_bottom.

Trong thư mục layout, tạo file popup.xml.

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:orientation="vertical" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:text="This is a PopupWindow" />

    <EditText

        android:id="@+id/e"

        android:layout_width="230dp"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:singleLine="true" >

        <requestFocus />

    </EditText>

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center_horizontal"

        android:onClick="close"

        android:text="Close" />

</LinearLayout>

File activity_main.xml sẽ như sau.

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="Show PopupWindow"

        android:onClick="onShowWindowClick" />

    <Button

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="bottom"

        android:text="Show PopupWindow"

        android:onClick="onShowWindowClick" />

</FrameLayout>

Class main như sau.

public class MainActivity extends Activity implements View.OnTouchListener {

     PopupWindow mOverlay;

     EditText e;

     @SuppressWarnings("deprecation")

     @Override

     protected void onCreate(Bundle savedInstanceState) {

          super.onCreate(savedInstanceState);

          setContentView(R.layout.activity_main);

          View popupContent = getLayoutInflater().inflate(R.layout.popup, null);

          mOverlay = new PopupWindow();

mOverlay.setWindowLayoutMode(WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.WRAP_CONTENT);

mOverlay.setWidth(getResources().getDimensionPixelSize(

                     R.dimen.popupWidth));

mOverlay.setHeight(getResources().getDimensionPixelSize(

                     R.dimen.popupHeight));

mOverlay.setContentView(popupContent);

mOverlay.setBackgroundDrawable(getResources().getDrawable(

                     R.drawable.popup_background));

     mOverlay.setAnimationStyle(R.style.PopupAnimation);

     mOverlay.setTouchInterceptor(this);

     mOverlay.setFocusable(true);

     e = (EditText) popupContent.findViewById((R.id.e));

     }

public void close(View v) {

String nhap = e.getText().toString();

if (nhap == null || nhap.trim().equals("")) {

Toast.makeText(this, "Bạn chưa nhập gì cả", Toast.LENGTH_SHORT).show();

}

else {

Toast.makeText(this, "Đã nhập " + nhap, Toast.LENGTH_SHORT).show();

e.setText("");

mOverlay.dismiss();

}

}

@Override

protected void onPause() {

     super.onPause();

// PopupWindow is like Dialog, it will leak if left visible while the Activity finishes

mOverlay.dismiss();

}

@Override

public boolean onTouch(View v, MotionEvent event) {

     // Handle any direct touch events passed to the PopupWindow

return false;

}

public void onShowWindowClick(View v) {

          if (mOverlay.isShowing()) {

               mOverlay.dismiss();

          } else {

          mOverlay.showAsDropDown(v);

          }

     }

}

Lúc này popup trông như sau.

Nhập thông tin rồi ấn Close sẽ thấy thông tin được toast ra.