[英]How to pass value from activity to Tab Fragment using replace Fragment?
我有活动,我从中获取一个值并将其传递给Tab Fragment中的Tab Fragment ..我想使用此值来setText
问题是如何将此值带到Tab片段? 我总是收到此异常java.lang.IllegalArgumentException:找不到片段Tab1的id .....的视图。如何解决?
我在android studio中使用了正常的Tab活动并修改了此方法
homee.java
public Fragment getItem(int position) {
switch (position){
case 0:
Tab1 tab1 =new Tab1();
return tab1;
case 1:
Tab2 tab2 =new Tab2();
return tab2;
case 2:
Tab3 tab3 =new Tab3();
return tab3;
}
return null ;
}
这是我的活动号码。java
public class number extends AppCompatActivity {
Button add,save;
TextView num;
int n;
String stringNum;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_number);
add = findViewById(R.id.idadd);
save = findViewById(R.id.idsave);
num = findViewById(R.id.idnum);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//simple method
n = Integer.parseInt(num.getText().toString());
num.setText(++n +"");
}
});
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stringNum= num.getText().toString();
// I want to pass this value to Tab1 Fragment by replaceFragment or by any
//way
Bundle bundle = new Bundle();
bundle.putString("key", stringNum);
Tab1 myFragment = new Tab1();
myFragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction().replace
(R.id.container,myFragment).commit();
finish();
}
});
}}
这是Tab活动的Tab1子级
public class Tab1 extends Fragment {
Button get,update;
TextView txt;
public Tab1(){}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup
container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab1, container, false);
get = view.findViewById(R.id.idget);
update = view.findViewById(R.id.idup);
txt = view.findViewById(R.id.textView);
get.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent in = new Intent(getContext(), number.class);
startActivity(in);
}
});
update.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String Number= getArguments().getString("key").toString();
//here the problem
txt.setText(Number);
}
});
return view;
}
}
activity_homee.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="eg.noname.opo.homee">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="@dimen/appbar_padding_top"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/AppTheme.PopupOverlay"
app:title="@string/app_name">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TabItem
android:id="@+id/tabItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tab_text_1" />
<android.support.design.widget.TabItem
android:id="@+id/tabItem2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tab_text_2" />
<android.support.design.widget.TabItem
android:id="@+id/tabItem3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/tab_text_3" />
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
tab1.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/fra">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="111dp"
android:text="TextView"
android:textAlignment="center"
android:textSize="30sp" />
<Button
android:id="@+id/idget"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="88dp"
android:text="get" />
<Button
android:id="@+id/idup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="update" />
</LinearLayout>
编辑我通过调用返回该值的静态方法解决了它,但仍然应该按Fragment中的Button将值更新为新值,我试图找到一种方法,当我从活动传递值时自动更新该值..有什么帮助吗?
在活动号
in onCreate method just call
String Number= getArguments().getString("key").toString();
//here the problem
txt.setText(Number)
您只需在getItem()方法中调用Fragment时传递值。
public Fragment getItem(int position) {
switch (position){
case 0:
Tab1 tab1= new Tab1();
Bundle bundle = new Bundle();
bundle.putString("name", name);
tab1.setArguments(bundle);
return tab1;
case 1:
Tab2 tab2= new Tab2();
Bundle bundle = new Bundle();
bundle.putString("mobile", mobile);
tab2.setArguments(bundle);
return tab2;
case 2:
Tab3 tab3= new Tab3();
Bundle bundle = new Bundle();
bundle.putString("email", email);
tab3.setArguments(bundle);
return tab3;
}
return null ;
}
您可以通过以下方法在下一个片段中对其进行检查:
if( getArguments() != null) {
name = getArguments().getString("name");
希望这对你有帮助。
只需将以下捆绑包与您要传递数据的片段一起传递:
Bundle data = new Bundle();//create bundle instance
data.putString("key_value", "String to pass");//put string to pass with key
fragmentName.setArguments(data);//Set bundle data to fragment
您可以在下一个片段中使用以下代码检索数据:
String getArgument = getArguments().getString("data");
text.setText(getArgument); //set string over textview
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