Question

我有一个服务，它有一个从布局xml文件中膨胀的按钮。我正在尝试向按钮添加onclicklistener，但由于某种原因，点击没有在按钮上正确注册。以下是扩展布局文件的服务代码。

public class OverlayServiceLayout extends Service implements View.OnClickListener
{
    private WindowManager windowManager;
    private LayoutInflater layoutInflater;
    private RelativeLayout mTopView;
    private Button myButton;

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this, "onservicelayout creation", Toast.LENGTH_SHORT).show();
        final WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.MATCH_PARENT,
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN,
                PixelFormat.TRANSLUCENT
        );

        windowManager = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);

        layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
        mTopView = (RelativeLayout) layoutInflater.inflate(R.layout.service_main, null);

        windowManager.addView(mTopView, params);
        myButton = (Button) mTopView.findViewById(R.id.button);
        myButton.setText("Button's text was changed");
        myButton.setOnClickListener(this);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        //Toast.makeText(this, "on destroy was called", Toast.LENGTH_SHORT).show();
        if(mTopView != null)
        {
            //Toast.makeText(this, "button is not null", Toast.LENGTH_SHORT).show();
            try{
                windowManager.removeView(mTopView);
            }
            catch(Exception ex)
            {
                ex.printStackTrace();
            }
            mTopView = null;
        }
        else
        {
            Toast.makeText(this, "button is null", Toast.LENGTH_SHORT).show();
        }
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onClick(View view)
    {
        Toast.makeText(this, "onclickregistered", Toast.LENGTH_SHORT).show();
        /*
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.putExtra("sms_body", "Hi");
        intent.putExtra(Intent.EXTRA_STREAM, R.drawable.smile);
        intent.setType("image/png");
        startActivity(Intent.createChooser(intent, "Send"));
        */
    }
}

此处还有xml布局文件。它只是一个带按钮的相对布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent">

    <Button
        android:text="Button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="118dp"
        android:layout_marginStart="118dp"
        android:layout_marginTop="127dp" />
</RelativeLayout>

Answer 1

您无法对服务中的视图进行通知，因为它们永远不会显示在屏幕上。如果服务需要来自用户的输入，它应该启动一个活动，然后可以创建用户可以与之交互的UI元素。

OnClickListener不适用于在Service中充气的布局

1 个答案: