Question

当我点击菜单溢出项目时，我正在尝试显示弹出窗口。我也为此写了一些代码。但它什么也没输出。

以下是一些代码：

@Override
public boolean onOptionsItemSelected(MenuItem item){
    switch (item.getItemId()) {
    case R.id.settings_id: 
        displayPopupWindow();
        return true;

    case R.id.about_us_id:

        return true;

        case R.id.logout_id:
        startActivity(new Intent(HomePage.this,MainActivity.class));
        return true;

    default:
        return super.onOptionsItemSelected(item);
    } 
}

public void displayPopupWindow() {
PopupWindow popup = new PopupWindow(this);
View layout = getLayoutInflater().inflate(R.layout.popup, null);
popup.setContentView(layout);
popup.setOutsideTouchable(true);
popup.setFocusable(true);
popup.showAtLocation(layout, Gravity.CENTER, 0, 0);

}

我的Xml文件代码如下：

<?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:background="@color/colorPrimary">

<TextView
    android:text="TextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="165dp"
    android:id="@+id/textView"
    tools:text="This is a Pop Up Window!"
    android:textSize="36sp"
    android:textStyle="normal|bold"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginLeft="19dp"
    android:layout_marginStart="19dp"
    android:textAlignment="center"
    android:fontFamily="sans-serif" />
</RelativeLayout>

错误在哪里？请帮帮我。

Answer 1

这是您的解决方案，

<强> MainActivity.java

public class MainActivity extends Activity {

    private PopupWindow mPopupWindow;
    private Button btnClosePopup;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.items, menu);

        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        super.onOptionsItemSelected(item);

        switch (item.getItemId()) {
            case R.id.phone:
                Toast.makeText(getBaseContext(), "You selected Phone", Toast.LENGTH_SHORT).show();
                break;

            case R.id.computer:
                Toast.makeText(getBaseContext(), "You selected Computer", Toast.LENGTH_SHORT).show();
                break;

            case R.id.gamepad:
                Toast.makeText(getBaseContext(), "You selected Gamepad", Toast.LENGTH_SHORT).show();
                break;

            case R.id.camera:
                Toast.makeText(getBaseContext(), "You selected Camera", Toast.LENGTH_SHORT).show();
                initiatePopupWindow();
                break;

            case R.id.video:
                Toast.makeText(getBaseContext(), "You selected Video", Toast.LENGTH_SHORT).show();
                break;

            case R.id.email:
                Toast.makeText(getBaseContext(), "You selected EMail", Toast.LENGTH_SHORT).show();
                break;

        }
        return true;

    }

    private void initiatePopupWindow() {
        try {
            LayoutInflater inflater = (LayoutInflater) MainActivity.this
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View layout = inflater.inflate(R.layout.popup,
                    (ViewGroup) findViewById(R.id.popup_element));
            mPopupWindow = new PopupWindow(layout, 300, 370, true);
            mPopupWindow.showAtLocation(layout, Gravity.CENTER, 0, 0);

            btnClosePopup = (Button) layout.findViewById(R.id.btn_close_popup);
            btnClosePopup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    mPopupWindow.dismiss();

                }
            });

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

<强> popup.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/popup_element"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#444444"
    android:orientation="vertical"
    android:padding="10sp">

    <TextView
        android:id="@+id/txtView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="5sp"
        android:text="Hello!" />

    <Button
        android:id="@+id/btn_close_popup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Close" />

</LinearLayout>

弹出窗口从菜单溢出项目选择android

1 个答案: