我正在开发一个应用程序,其中我有一个用ScrollView包装的布局。在这个布局的片段中,我正在访问一个Web服务来从服务器获取数据并在我的布局中显示它。每当Web服务中出现错误或数据不可用时,我都会向用户显示一个小吃栏,其中包含相应的消息。
问题
我遇到的问题只发生得很少。如果有时数据不可用并且显示了snackbar,我的应用程序会因非法状态异常显示消息而崩溃
ScrollView can host only one direct child
以下是崩溃日志
java.lang.IllegalStateException: ScrollView can host only one direct child
at android.widget.ScrollView.addView(ScrollView.java:253)
at android.support.design.widget.Snackbar.showView(Snackbar.java:475)
at android.support.design.widget.Snackbar$1.handleMessage(Snackbar.java:162)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:6102)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
我在很多屏幕上使用这个组合,所以我只发布其中一个xmls的布局代码
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none">
<LinearLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/background"
android:orientation="vertical"
android:paddingBottom="20dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="10dp">
<com.xsinfosol.emergency.progressbar.RopeProgressBar
android:id="@+id/progress_bar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
app:ropeDynamicLayout="true"
app:ropePrimaryColor="@color/red"
app:ropeSecondaryColor="#20FFFFFF"
app:ropeSlack="0dp"
app:ropeStrokeWidth="10dp" />
<ImageView
android:id="@+id/iv_default_sos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="40dp"
android:src="@drawable/on_light" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="1"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_health"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/medical"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Health"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="2"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_police"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/police"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Police"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="3"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_fire"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/fire"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Fire"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="4"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_no_4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/contact_person"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Contact Person 1"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="5"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_no_5"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/contact_person"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Contact Person 2"
android:textColor="@android:color/white" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/edittext_bg">
<com.xsinfosol.emergency.utils.CustomTextView
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:layout_margin="10dp"
android:background="@drawable/number_circle"
android:gravity="center"
android:text="6"
android:textColor="@color/red"
android:textSize="22sp" />
<com.xsinfosol.emergency.utils.CustomTextView
android:id="@+id/tv_view_no_6"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:drawableRight="@drawable/contact_person"
android:gravity="center_vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:text="Contact Person 3"
android:textColor="@android:color/white" />
</LinearLayout>
</LinearLayout>
</ScrollView>
这是我从api
解析数据的方法public void parseSOSResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
String Message=jsonObject.optString("Message");
int error_code = jsonObject.getInt("error_code");
if (error_code == 1) {
String num_4 = jsonObject.getString("num_4");
String num_5 = jsonObject.getString("num_5");
String num_6 = jsonObject.getString("num_6");
String health_number=jsonObject.getString("health_number");
String fire_number=jsonObject.getString("fire_number");
String police_number=jsonObject.getString("police_number");
Profile_complete=jsonObject.getInt("Profile_complete");
default_sos = jsonObject.getString("default_sos");
tv_view_no_4.setText(num_4);
tv_view_no_5.setText(num_5);
tv_view_no_6.setText(num_6);
tv_view_fire.setText("Fire \n"+fire_number);
tv_view_police.setText("Police \n"+police_number);
tv_view_health.setText("Health \n"+health_number);
progress_bar1.setMax(100);
progress_bar1.animate();
progress_bar1.animateProgress(Profile_complete);
prefManager.putString(PrefrenceConstants.KEY_EMERGENCY_TYPE,default_sos);
}else{
((ActivityNavigationDrawer)getActivity()).showSnackBar(iv_default_sos,Message);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
showSnackbar方法
public void showSnackBar(View view, String message) {
Snackbar.make(view, message, Snackbar.LENGTH_SHORT).show();
}
答案 0 :(得分:4)
问题是ScrollViews只能有一个直接子项,而在你的代码中,这个子项是外部线性布局。当调用快餐栏时,我认为您要求在其中绘制小吃栏的视图是滚动视图本身,因此将有两个直接的孩子(您的线性布局和现在关于小吃店的视图)
答案 1 :(得分:1)
根据Marcelo Noguti的建议,将Scrollview
置于<{1}}内并将其作为快餐栏方法中的视图传递给我解决了问题。
答案 2 :(得分:0)
尝试使用LinearLayout包装子项,同时设置width和height以包装内容。如本部分所述
<LinearLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/background"
android:orientation="vertical"
android:paddingBottom="20dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="10dp">