Android 将setText添加到主活动应用程序后，突然停止
我正在键入在我的主要活动中使用setText到TextView。我的应用程序停止工作，请查看我的Android 将setText添加到主活动应用程序后，突然停止,android,xml,Android,Xml,我正在键入在我的主要活动中使用setText到TextView。我的应用程序停止工作，请查看我的nav_header.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" andr
nav_header.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"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="@+id/social_image"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_gravity="center_horizontal"
android:contentDescription="@string/cd_main_image"
android:scaleType="centerCrop"
android:src="@drawable/left_menu_social_small" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical" >
<com.facebook.login.widget.ProfilePictureView
android:id="@+id/profimage"
android:layout_width="72dp"
android:layout_height="72dp"
android:layout_margin="20dp"
android:src="@drawable/ic_person"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_marginLeft="4dp"
android:gravity="center_vertical"
android:orientation="vertical" >
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:text="Ravi Shankar"
android:textColor="@android:color/white"
android:textSize="24sp"
app:typeface="robotoLight" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/user_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="from Visakhapatnam"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoLight" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal" >
<zesteve.com.myapplication.font.MaterialDesignIconsTextView
android:id="@+id/icon_friends"
style="@style/TextViewAppearance.Title1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="32dp"
android:padding="0dp"
android:text="@string/material_icon_account_multiple"
android:textColor="@color/main_color_500"
android:textSize="22dp" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/number_of_friends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="4dp"
android:text="152"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoBold" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/fb_gend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="friends"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoLight" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal" >
<zesteve.com.myapplication.font.MaterialDesignIconsTextView
android:id="@+id/icon_message"
style="@style/TextViewAppearance.Title1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:padding="0dp"
android:text="@string/material_icon_message"
android:textColor="@color/main_color_500"
android:textSize="22dp" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/number_of_messages"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="4dp"
android:text="15"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoBold" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/fb_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="messages"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoLight" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal" >
<zesteve.com.myapplication.font.MaterialDesignIconsTextView
android:id="@+id/icon_photos"
style="@style/TextViewAppearance.Title1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="32dp"
android:padding="0dp"
android:text="@string/material_icon_image_box"
android:textColor="@color/main_color_500"
android:textSize="22dp" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/number_of_photos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="4dp"
android:text="22"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoBold" />
<zesteve.com.myapplication.font.RobotoTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="photos"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoLight" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center_vertical"
android:orientation="horizontal" >
<zesteve.com.myapplication.font.MaterialDesignIconsTextView
android:id="@+id/icon_videos"
style="@style/TextViewAppearance.Title1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:padding="0dp"
android:text="@string/material_icon_video"
android:textColor="@color/main_color_500"
android:textSize="22dp" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/number_of_videos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginRight="4dp"
android:text="2"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoBold" />
<zesteve.com.myapplication.font.RobotoTextView
android:id="@+id/fb_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="videos"
android:textColor="@android:color/white"
android:textSize="12sp"
app:typeface="robotoLight" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
<View
android:id="@+id/divider_top"
android:layout_width="match_parent"
android:layout_height="3dp"
android:layout_alignParentLeft="true"
android:layout_below="@id/social_image"
android:background="@color/material_light_yellow_600" />
</RelativeLayout>
setTextTextView05-03 23:06:16.764 2439-2439/zesteve.com.myapplication E/dalvikvm: Could not find class 'android.app.AppOpsManager', referenced from method com.google.android.gms.internal.zzadf.zzg
05-03 23:06:20.376 2439-2439/zesteve.com.myapplication E/dalvikvm: Could not find class 'android.graphics.drawable.RippleDrawable', referenced from method android.support.v7.widget.AppCompatImageHelper.hasOverlappingRendering
05-03 23:06:20.388 2439-2439/zesteve.com.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{zesteve.com.myapplication/zesteve.com.myapplication.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at zesteve.com.myapplication.MainActivity.onCreate(MainActivity.java:55)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import zesteve.com.myapplication.R;
public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 3 ;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.tab_layout,null);
tabLayout = (TabLayout) x.findViewById(R.id.tabs);
viewPager = (ViewPager) x.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
@Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return x;
}
class MyAdapter extends FragmentPagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new PrimaryFragment();
case 1 : return new SocialFragment();
case 2 : return new UpdatesFragment();
}
return null;
}
@Override
public int getCount() {
return int_items;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Category";
case 1 :
return "Events";
case 2 :
return "Updates";
}
return null;
}
}
}
如果您有任何疑问，请发表评论。您必须使用导航
标题视图的参考才能使用文本视图（用户名和用户位置）
更新MainActivity
如下：
public class MainActivity extends AppCompatActivity {
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
Session session;
TextView fbuname , fbulocation , fbuid , fbuemail , fbugend ;
ImageView fbpropic;
// NavigationView Header
View mHeaderView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;
session= new Session(MainActivity.this);
// NavigationView Header
mHeaderView = mNavigationView.getHeaderView(0);
// Views
fbuname = (TextView) mHeaderView.findViewById(R.id.user_name);
fbulocation = (TextView) mHeaderView.findViewById(R.id.user_location);
// Set text
fbulocation.setText("Hyderabad");
fbuname.setText("Ramachandra");
...........
......................
}
}
希望这将有助于~将你的stacktrace放在这里是的，它刚刚添加了，它说的是nullpointerexception为什么否决投票？很乐意帮助：）
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import zesteve.com.myapplication.R;
public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 3 ;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.tab_layout,null);
tabLayout = (TabLayout) x.findViewById(R.id.tabs);
viewPager = (ViewPager) x.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
@Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return x;
}
class MyAdapter extends FragmentPagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new PrimaryFragment();
case 1 : return new SocialFragment();
case 2 : return new UpdatesFragment();
}
return null;
}
@Override
public int getCount() {
return int_items;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Category";
case 1 :
return "Events";
case 2 :
return "Updates";
}
return null;
}
}
}
public class MainActivity extends AppCompatActivity {
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
Session session;
TextView fbuname , fbulocation , fbuid , fbuemail , fbugend ;
ImageView fbpropic;
// NavigationView Header
View mHeaderView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;
session= new Session(MainActivity.this);
// NavigationView Header
mHeaderView = mNavigationView.getHeaderView(0);
// Views
fbuname = (TextView) mHeaderView.findViewById(R.id.user_name);
fbulocation = (TextView) mHeaderView.findViewById(R.id.user_location);
// Set text
fbulocation.setText("Hyderabad");
fbuname.setText("Ramachandra");
...........
......................
}
}