在AlertDialog中使用WebView（Android）显示软键盘

Dialog dialog = new Dialog(this);
dialog.requestWindowFeature(Window.FEATURE_LEFT_ICON);
dialog.setContentView(R.layout.dialog);
dialog.setTitle("My great title");
dialog.setCancelable(true);

dialog.show();
dialog.setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, R.drawable.icon);

WebView vw = (WebView) dialog.findViewById(R.id.wv);

public static class LocalWebView extends WebView {
    public LocalWebView(Context context) {
        super(context);
    }

    public LocalWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LocalWebView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public LocalWebView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
   }

    public LocalWebView(Context context, AttributeSet attrs, int defStyleAttr, boolean privateBrowsing) {
        super(context, attrs, defStyleAttr, privateBrowsing);
    }

    @Override
    public boolean onCheckIsTextEditor() {
        return true;
    }
}