Android设备上查看飘 [英] Android View Gone
问题描述
新来的Andr ?? iod,并试图基于共享preferences设置view.GONE。但是它不走了!我是怎么破?!
编辑
因此,测试下属发出后是设置没有被正确地完成......所以,现在是固定的让再试一次。 He'res我的onCreate ...当我删除TextView的临时code正常工作,并显示通过土司preF的变化,但是当code它有应用程序崩溃。
@覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
共享preferences米preferences = preferenceManager.getDefaultShared preferences(getActivity());
//充气的布局该片段 布尔symptothermal = M preferences.getBoolean(symptothermal,真正的); 如果(!symptothermal){
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司1!,Toast.LENGTH_LONG).show();
}其他{
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司2!,Toast.LENGTH_LONG).show();
} 如果(!symptothermal){
TextView的TEMP =(TextView中)getView()findViewById(R.id.temp)。
temp.setVisibility(View.GONE);
}
}
He're的XML FYI:
<?XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:方向=垂直> < RelativeLayout的
机器人:ID =@ + ID / relativeLayout1
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_weight =0.23> <! - 日期文本 - >
<的EditText
机器人:ID =@ + ID / dateselected
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentLeft =真
机器人:layout_marginTop =10dp
机器人:layout_toLeftOf =@ + ID / pickdate
机器人:比重=中心
安卓的inputType =日期/> <! - DatePicker的按钮 - >
<按钮
机器人:ID =@ + ID / pickdate
机器人:layout_width =80dp
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignBaseline =@ + ID / dateselected
机器人:layout_alignBottom =@ + ID / dateselected
机器人:layout_alignParentRight =真
机器人:SRC =@绘制/ ic_datepicker
机器人:文字=@字符串/日期/> <! - 温度标签 - >
<的EditText
机器人:ID =@ + ID / TEMP
机器人:layout_width =192dp
机器人:layout_height =WRAP_CONTENT
机器人:layout_alignParentLeft =真
机器人:layout_below =@ + ID / pickdate
机器人:EMS =10
安卓的inputType =TEXT
机器人:文字=@字符串/ TEMP
机器人:可点击=假
机器人:cursorVisible =假
机器人:可聚焦=假
机器人:focusableInTouchMode =假
机器人:layout_marginTop =10dp>
< /&的EditText GT; <! - 温度场 - >
<的EditText
机器人:ID =@ + ID / tempvalue
机器人:layout_width =80dp
机器人:layout_height =WRAP_CONTENT
机器人:layout_below =@ + ID / pickdate
机器人:layout_toRightOf =@ + ID / dateselected
机器人:EMS =10
安卓的inputType =数字
机器人:layout_marginTop =10dp/> < / RelativeLayout的> <! - 注释字段 - > <的EditText
机器人:ID =@ + ID / chartingnote
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =0dip
机器人:layout_weight =0.58
机器人:EMS =20
机器人:重力=顶| CENTER_HORIZONTAL
机器人:提示=@字符串/ hintNote
安卓的inputType =textMultiLine/> <! - 更新按钮 - > <按钮
机器人:ID =@ + ID / chartingupdate
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:文字=@字符串/ charting_update/>< / LinearLayout中>
编辑@ daniel_c05:
包com.projectcaruso.naturalfamilyplaning; 进口com.projectcaruso.naturalfamilyplanning.R; 进口android.app.DatePickerDialog.OnDateSetListener;
进口android.content.Context;
进口android.content.Shared preferences;
进口android.os.Bundle;
。进口的Android preference preferenceManager。
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.DatePicker;
进口android.widget.TextView;
进口android.widget.Toast; 公共类ChartingFragment扩展片段实现OnDateSetListener {
共享preferences米preferences = preferenceManager.getDefaultShared preferences(getActivity());
布尔symptothermal = M preferences.getBoolean(symptothermal,真正的); @覆盖
公共无效onDateSet(查看的DatePicker,年整型,诠释monthOfYear,诠释请将dayOfMonth){
// TODO自动生成方法存根
} 公共无效showDatePickerDialog(视图v){
DatePickerFragment newFragment =新DatePickerFragment();
newFragment.show(getChildFragmentManager(),日期选择器);
} @覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
如果(!symptothermal){
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司1!,Toast.LENGTH_LONG).show();
}其他{
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司2!,Toast.LENGTH_LONG).show();
}
} @覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,捆绑savedInstanceState){
//充气视图
查看查看= inflater.inflate(R.layout.fragment_charting,NULL);
//现在你可以初始化的TextView
//我们怎么不叫通知getView()? :P
TextView的TEMP =(TextView中)view.findViewById(R.id.temp);
如果(!symptothermal){
//隐藏如果必要的观点
temp.setVisibility(View.GONE);
}
返回视图。
}
}
日志:
05-08 14:10:55.042:E / AndroidRuntime(22900):致命异常:主要
05-08 14:10:55.042:E / AndroidRuntime(22900):显示java.lang.NullPointerException
05-08 14:10:55.042:E / AndroidRuntime(22900):在Android的preference preferenceManager.getDefaultShared preferencesName(preferenceManager.java:371)。
05-08 14:10:55.042:E / AndroidRuntime(22900):在Android的preference preferenceManager.getDefaultShared preferences(preferenceManager.java:366)。
。05-08 14:10:55.042:E / AndroidRuntime(22900):在com.projectcaruso.naturalfamilyplaning.ChartingFragment<&初始化GT;(ChartingFragment.java:21)
05-08 14:10:55.042:E / AndroidRuntime(22900):在com.projectcaruso.naturalfamilyplaning.MenuFragment.onListItemClick(MenuFragment.java:36)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.support.v4.app.ListFragment $ 2.onItemClick(ListFragment.java:58)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.widget.AdapterView.performItemClick(AdapterView.java:298)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.widget.AbsListView.performItemClick(AbsListView.java:1100)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.widget.AbsListView $ PerformClick.run(AbsListView.java:2749)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.widget.AbsListView $ 1.run(AbsListView.java:3423)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.os.Handler.handleCallback(Handler.java:725)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.os.Handler.dispatchMessage(Handler.java:92)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.os.Looper.loop(Looper.java:137)
05-08 14:10:55.042:E / AndroidRuntime(22900):在android.app.ActivityThread.main(ActivityThread.java:5041)
05-08 14:10:55.042:E / AndroidRuntime(22900):在java.lang.reflect.Method.invokeNative(本机方法)
05-08 14:10:55.042:E / AndroidRuntime(22900):在java.lang.reflect.Method.invoke(Method.java:511)
05-08 14:10:55.042:E / AndroidRuntime(22900):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:793)
05-08 14:10:55.042:E / AndroidRuntime(22900):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-08 14:10:55.042:E / AndroidRuntime(22900):在dalvik.system.NativeStart.main(本机方法)
根据我的理解,你正在使用这个code片段。
因此,要知道,一个片段的生命周期,从一个活动的不同。在的onCreate
您不能操作上的一个分段UI元素。
您使用这样的:
如果(!symptothermal){
TextView的TEMP =(TextView中)getView()findViewById(R.id.temp)。
temp.setVisibility(View.GONE);
}
让我们改变这一点,
第一步:更改布尔symptothermal
是一个实例变量,而不是内部变量的onCreate
。因此,使得它在不同的生命周期提供。
第二步:保持同样的code为的onCreate
,但事实上,你不叫code改变TextView的知名度,我们将继续前进了别的地方。
第三步:覆盖onCreateView代替。
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
//充气视图
查看查看= inflater.inflate(R.layout.your_layout,NULL);
//现在你可以初始化的TextView
//我们怎么不叫通知getView()? :P
TextView的TEMP =(TextView中)view.findViewById(R.id.temp);
如果(!symptothermal){
//隐藏如果必要的观点
temp.setVisibility(View.GONE);
}
返回视图。
}
这应该工作。
修改
所以,我注意到你这样做:
共享preferences米preferences = preferenceManager.getDefaultShared preferences(getActivity());
布尔symptothermal = M preferences.getBoolean(symptothermal,真正的);
这就是问题所在,您呼叫getDefaultShared preferences以外的任何生命周期的,这就是为什么它失败。
显示方式:
公共类ChartingFragment扩展片段实现OnDateSetListener {
//不要初始化实例变量尚未
共享preferences米preferences;
布尔symptothermal;@覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
//这是一个很好的时机,初始化
米preferences = preferenceManager.getDefaultShared preferences(getActivity());
symptothermal = M preferences.getBoolean(symptothermal,真正的); 如果(!symptothermal){
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司1!,Toast.LENGTH_LONG).show();
}其他{
上下文的背景下= getActivity()getApplicationContext()。
Toast.makeText(背景下,你好吐司2!,Toast.LENGTH_LONG).show();
}
}
}
New to andriod and trying to set view.GONE based on shared preferences. However it's not gone! What did i break?!
EDIT So, after testing the underling issue was that the settings weren't being done correctly... So now that that is fixed lets try again. He'res my onCreate... When i remove the textview temp code it works fine and shows the change in pref via the toast, however when the code it there the app crashes.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
// Inflate the layout for this fragment
Boolean symptothermal = mPreferences.getBoolean("symptothermal", true);
if (!symptothermal) {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 1!", Toast.LENGTH_LONG).show();
} else {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 2!", Toast.LENGTH_LONG).show();
}
if (!symptothermal) {
TextView temp = (TextView) getView().findViewById(R.id.temp);
temp.setVisibility(View.GONE);
}
}
He're the XML FYI:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.23" >
<!-- Date Text -->
<EditText
android:id="@+id/dateselected"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginTop="10dp"
android:layout_toLeftOf="@+id/pickdate"
android:gravity="center"
android:inputType="date" />
<!-- DatePicker button -->
<Button
android:id="@+id/pickdate"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/dateselected"
android:layout_alignBottom="@+id/dateselected"
android:layout_alignParentRight="true"
android:src="@drawable/ic_datepicker"
android:text="@string/date" />
<!-- Temp Label -->
<EditText
android:id="@+id/temp"
android:layout_width="192dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/pickdate"
android:ems="10"
android:inputType="text"
android:text="@string/temp"
android:clickable="false"
android:cursorVisible="false"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_marginTop="10dp">
</EditText>
<!-- Temp field -->
<EditText
android:id="@+id/tempvalue"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_below="@+id/pickdate"
android:layout_toRightOf="@+id/dateselected"
android:ems="10"
android:inputType="number"
android:layout_marginTop="10dp" />
</RelativeLayout>
<!-- Notes Field -->
<EditText
android:id="@+id/chartingnote"
android:layout_width="wrap_content"
android:layout_height="0dip"
android:layout_weight="0.58"
android:ems="20"
android:gravity="top|center_horizontal"
android:hint="@string/hintNote"
android:inputType="textMultiLine" />
<!-- Update Button -->
<Button
android:id="@+id/chartingupdate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/charting_update" />
</LinearLayout>
EDIT @ daniel_c05:
package com.projectcaruso.naturalfamilyplaning;
import com.projectcaruso.naturalfamilyplanning.R;
import android.app.DatePickerDialog.OnDateSetListener;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.Toast;
public class ChartingFragment extends Fragment implements OnDateSetListener {
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
Boolean symptothermal = mPreferences.getBoolean("symptothermal", true);
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
// TODO Auto-generated method stub
}
public void showDatePickerDialog(View v) {
DatePickerFragment newFragment = new DatePickerFragment();
newFragment.show(getChildFragmentManager(), "datePicker");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!symptothermal) {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 1!", Toast.LENGTH_LONG).show();
} else {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 2!", Toast.LENGTH_LONG).show();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//Inflate a view
View view = inflater.inflate(R.layout.fragment_charting, null);
//now you can initialize the TextView
//notice how we don't call getView()? :P
TextView temp = (TextView) view.findViewById(R.id.temp);
if (!symptothermal) {
//Hide the view if necessary
temp.setVisibility(View.GONE);
}
return view;
}
}
Logs:
05-08 14:10:55.042: E/AndroidRuntime(22900): FATAL EXCEPTION: main
05-08 14:10:55.042: E/AndroidRuntime(22900): java.lang.NullPointerException
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.preference.PreferenceManager.getDefaultSharedPreferencesName(PreferenceManager.java:371)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.preference.PreferenceManager.getDefaultSharedPreferences(PreferenceManager.java:366)
05-08 14:10:55.042: E/AndroidRuntime(22900): at com.projectcaruso.naturalfamilyplaning.ChartingFragment.<init>(ChartingFragment.java:21)
05-08 14:10:55.042: E/AndroidRuntime(22900): at com.projectcaruso.naturalfamilyplaning.MenuFragment.onListItemClick(MenuFragment.java:36)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.support.v4.app.ListFragment$2.onItemClick(ListFragment.java:58)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.widget.AdapterView.performItemClick(AdapterView.java:298)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2749)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.widget.AbsListView$1.run(AbsListView.java:3423)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.os.Handler.handleCallback(Handler.java:725)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.os.Handler.dispatchMessage(Handler.java:92)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.os.Looper.loop(Looper.java:137)
05-08 14:10:55.042: E/AndroidRuntime(22900): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-08 14:10:55.042: E/AndroidRuntime(22900): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 14:10:55.042: E/AndroidRuntime(22900): at java.lang.reflect.Method.invoke(Method.java:511)
05-08 14:10:55.042: E/AndroidRuntime(22900): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-08 14:10:55.042: E/AndroidRuntime(22900): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-08 14:10:55.042: E/AndroidRuntime(22900): at dalvik.system.NativeStart.main(Native Method)
Based on what I understand, you are using a Fragment for this code.
Therefore, be aware that the life-cycle of a Fragment differs from that of an activity. During onCreate
you cannot manipulate UI elements on a Fragment.
You use this:
if (!symptothermal) {
TextView temp = (TextView) getView().findViewById(R.id.temp);
temp.setVisibility(View.GONE);
}
Let's change it a bit,
Step One: Change Boolean symptothermal
to be a instance variable, and not an inner variable of onCreate
. Therefore, making it available during the different lifecycles.
Step Two: Keep the same code for onCreate
, except the fact that you don't call the code that changes the TextView visibility, we'll move that somewhere else.
Step Three: Override onCreateView instead.
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Inflate a view
View view = inflater.inflate(R.layout.your_layout, null);
//now you can initialize the TextView
//notice how we don't call getView()? :P
TextView temp = (TextView) view.findViewById(R.id.temp);
if (!symptothermal) {
//Hide the view if necessary
temp.setVisibility(View.GONE);
}
return view;
}
That should work well.
EDIT
So I noticed you did this:
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
Boolean symptothermal = mPreferences.getBoolean("symptothermal", true);
And that is the problem, you are calling getDefaultSharedPreferences outside any of the lifecycles and that's why it fails.
See this:
public class ChartingFragment extends Fragment implements OnDateSetListener {
//Don't initialize the instance variables yet
SharedPreferences mPreferences;
Boolean symptothermal;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Here's a good moment to initialize
mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
symptothermal = mPreferences.getBoolean("symptothermal", true);
if (!symptothermal) {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 1!", Toast.LENGTH_LONG).show();
} else {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 2!", Toast.LENGTH_LONG).show();
}
}
}
这篇关于Android设备上查看飘的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!