Android 片段到活动Backstack返回空白视图
我创建了一个家庭活动,其中包括Android 片段到活动Backstack返回空白视图,android,android-layout,android-fragments,android-activity,Android,Android Layout,Android Fragments,Android Activity,我创建了一个家庭活动,其中包括Tablayout和导航抽屉onclick with fragment。我包含了fragmentTransaction.addToBackStack(null.commit()使用片段事务代码返回到上一个活动 我所需的需求来自Activity with tablayout-->NavigationDrawer-->Fragment1-->On BackButtonPress-->main Activity with tablayout. 但是,现在我可以移动到Fra
Tablayout和导航抽屉
onclick with fragment。我包含了fragmentTransaction.addToBackStack(null.commit()代码>使用片段事务代码返回到上一个活动
我所需的需求来自Activity with tablayout-->NavigationDrawer-->Fragment1-->On BackButtonPress-->main Activity with tablayout.
但是,现在我可以移动到Fragment1,当返回到MainActivity时,视图变成白色的(如果我使用mainLayout.removeAllViews()
;如果我不使用mainLayout.removeAllViews();,则片段与MainActivity重叠
)
1.我的主要活动
2.碎片
3.当我返回主活动时
现在我在我的主要活动中看不到表格
谁能帮帮我吗。
mainactivity_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="@+id/mainlayout"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rel">
<RelativeLayout
android:id="@+id/main_layout1"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="@+id/mainlayout"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rel">
<RelativeLayout
android:id="@+id/main_layout1"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
// Replace NavigationView fragments in this FrameLayout
<FrameLayout
android:id="@+id/flForReplace"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".FrameLayout" />
</RelativeLayout>
Fragment.java
import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
public class ContactFragment extends Fragment implements OnMapReadyCallback {
private GoogleMap mMap;
Button call;
public ContactFragment() {
// Required empty public constructor
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.activity_contact,container,false);
call = (Button) v.findViewById(R.id.button5);
call.setOnClickListener(new View.OnClickListener() {
@SuppressLint("NewApi")
@Override
public void onClick(View v) {
Intent i = new Intent(Intent.ACTION_DIAL);
i.setData(Uri.parse("tel:7034409615"));
startActivity(i);
}
});
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
return v;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(9.2700, 76.7800);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Pathanamthitta"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
在MainActivity.java中添加以下内容:
protected OnBackPressedListener onBackPressedListener;
public interface OnBackPressedListener {
void doBack();
}
public void setOnBackPressedListener(OnBackPressedListener onBackPressedListener) {
this.onBackPressedListener = onBackPressedListener;
}
@Override
public void onBackPressed() {
if (onBackPressedListener != null)
onBackPressedListener.doBack();
else
super.onBackPressed();
}
而不是在Fragment.java
中实现如下类:
implements MainActivity.OnBackPressedListener
并实现方法:
@Override
public void doBack() {
Intent yourMainActivity = new Intent(getActivity(), MainActivity.class);
startActivity(yourMainActivity);
}
鲁宾·内利库纳图。我也有同样的问题。替换FrameLayout
中的NavigationView
片段,而不是RelativeLayout
。因此,您总是要加载表格布局
和查看页面
。
将其放入mainactivity\u layout.xml
或app\u bar\u home.xml
(我看不到您的完整代码,所以您可以尝试这些组合)
mainactivity_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="@+id/mainlayout"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rel">
<RelativeLayout
android:id="@+id/main_layout1"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".HomeActivity"
android:id="@+id/mainlayout"
tools:showIn="@layout/app_bar_home">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rel">
<RelativeLayout
android:id="@+id/main_layout1"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
// Replace NavigationView fragments in this FrameLayout
<FrameLayout
android:id="@+id/flForReplace"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".FrameLayout" />
</RelativeLayout>
同时替换fragmentTransaction.addToBackStack(null.commit()使用fragmentTransaction.commit()进行代码>操作代码>如ρѕρєK所建议。如我在评论中所建议的,为了找出显示片段的问题,您可以尝试查看正在添加到后堆栈中的片段类型,如下所示
Log.d(“碎片列表”,getSupportFragmentManager().getFragments().toString();
您可以将其放入onBackPressed()
,onNavigationItemSelected()
根据你的反馈,这对你很有帮助,你解决了问题
还有一些布局设计问题:
您当前的方法是将片段添加到相对布局中。我相信这会导致视图出现一些问题。建议的方法是将片段添加到FrameLayout中,如中所述
此外,您可能希望将所有用于片段的内容移动到视图外部
我已经按照docs.P.S中推荐的指南重写了你的布局。我还没有测试它的显示方式。你可能需要调整一些布局参数
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--
Layout for fragments
-->
<FrameLayout
android:id="@+id/mainlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_home">
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rel">
<RelativeLayout
android:id="@+id/main_layout1"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" android:orientation="horizontal"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager1"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout1"/>
</RelativeLayout>
</RelativeLayout>
</LinearLayout>
您还在布局中定义了多个活动,如tools:context=“.MainActivity”
和tools:context=“.HomeActivity”
我想这只是未编辑的复制粘贴,但也可能导致一些问题
希望您觉得它有用:)使用fragmentTransaction.commit()时会发生什么
而不是fragmentTransaction.addToBackStack(null.commit()代码>在onNavigationItemSelected
中,向我们显示Backback中有哪些片段。您可以使用以下方法查看它们Log.d(“FragmentList”,getSupportFragmentManager().getFragments().toString())
您可以将其放入onBackPressed()
,onNavigationItemSelected()
尝试使用将片段添加到Framewlayout中。。您当前的方法是将片段添加到相对布局中。我相信这会导致一些观点上的问题。建议的方法是按照文档中的描述将片段添加到FrameLayout中。另外,您可能希望将所有用于片段的内容移到视图之外。请在回复其他内容时将我称为@ProblemSlover。我不会收到关于您的响应的通知。我已重写了您的布局。请查看您在布局中定义的多个活动,如tools:context=“.MainActivity”
和tools:context=“.HomeActivity”
我猜这只是未编辑的复制粘贴,但也可能导致一些问题..您可以尝试替换fragmentTransaction.replace(R.id.mainlayout,fragment);此语句包含fragmentTransaction.add(R.id.mainlayout,fragment);。谢谢