如何解决在BottomNavigationView中添加4个菜单项时显示错误
我是android的新手..试图构建在片段内部具有webview的应用程序，而在底部，则根据单击单击更改特定项目片段的底部具有BottomNavigationView。
当我添加4个应用程序开始崩溃时，在BottomNavigationView中具有3个项目时，一切正常。
错误就像休假-
E/AndroidRuntime: FATAL EXCEPTION: main
Process: in.xparticle.digitalkabadi,PID: 23369
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.xparticle.digitalkabadi/in.xparticle.digitalkabadi.MainActivity}: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:940)
Caused by: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
Caused by: android.view.InflateException: Binary XML file line #19 in in.xparticle.digitalkabadi:layout/activity_main: Error inflating class com.google.android.material.bottomnavigation.BottomNavigationView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:854)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1006)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:170)
at in.xparticle.digitalkabadi.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:7824)
at android.app.Activity.performCreate(Activity.java:7813)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1306)
at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:940)
E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setImportantForAccessibility(int)' on a null object reference
at androidx.core.view.ViewCompat.setImportantForAccessibility(ViewCompat.java:1119)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:104)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:87)
at com.google.android.material.bottomnavigation.BottomNavigationItemView.<init>(BottomNavigationItemView.java:83)
at com.google.android.material.bottomnavigation.BottomNavigationMenuView.getNewItem(BottomNavigationMenuView.java:606)
at com.google.android.material.bottomnavigation.BottomNavigationMenuView.buildMenuView(BottomNavigationMenuView.java:538)
at com.google.android.material.bottomnavigation.BottomNavigationPresenter.updateMenuView(BottomNavigationPresenter.java:67)
at com.google.android.material.bottomnavigation.BottomNavigationView.inflateMenu(BottomNavigationView.java:344)
at com.google.android.material.bottomnavigation.BottomNavigationView.<init>(BottomNavigationView.java:226)
at com.google.android.material.bottomnavigation.BottomNavigationView.<init>(BottomNavigationView.java:133)
... 28 more
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
bottomNav.setonNavigationItemSelectedListener(navListener);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new HomeFragment()).commit();
}
private BottomNavigationView.OnNavigationItemSelectedListener navListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()){
case R.id.nav_home:
selectedFragment = new HomeFragment();
break;
case R.id.nav_scrape_price:
selectedFragment = new ScrapePriceFragment();
break;
case R.id.nav_aboutUs:
selectedFragment = new AboutUsFragment();
break;
case R.id.nav_scrape_Process:
selectedFragment = new AboutUsFragment();
break;
}
assert selectedFragment != null;
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,selectedFragment).commit();
return true;
}
};
}
解决方法
尝试->
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//loading the default fragment
loadFragment(new FirstFragment());
//getting bottom navigation view and attaching the listener
BottomNavigationView navigation = findViewById(R.id.bottom_navigation);
navigation.setOnNavigationItemSelectedListener(this);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
Fragment fragment = null;
switch (item.getItemId()) {
case R.id.id1:
fragment = new FirstFragment();
break;
case R.id.id2:
fragment = new SecondFragment();
break;
case R.id.id3:
fragment = new thirsFragment();
break;
case R.id.id4:
fragment = new fourthFragment();
break;
}
return loadFragment(fragment);
}
private boolean loadFragment(Fragment fragment) {
//switching fragment
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_container,fragment)
.commit();
return true;
}
return false;
}
}
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