Question

当我运行此活动时，出现错误致命错误，似乎将我的activity_shipper布局指向了我的FloatingActionButton

这是我的代码：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_shippers_man);

    fabAdd=findViewById(R.id.fab_add);
    fabAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showCreateShipperLayout();
        }
    });

    recyclerView = findViewById(R.id.recycler_shippers);
    recyclerView.setHasFixedSize(true);
    layoutManager=new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);

    //Firebase
    database = FirebaseDatabase.getInstance();
    shippers = database.getReference(Common.SHIPPERS_TABLE);

    loadAllShippers();
}

我明白了：

FATAL EXCEPTION: main
Process: com.example.fmy.frutifellesserver, PID: 19015
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fmy.frutifellesserver/com.example.fmy.frutifellesserver.ShippersMan}: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class <unknown>
Caused by: android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class <unknown>
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.example.fmy.frutifellesserver.ShippersMan.onCreate(ShippersMan.java:44)
Caused by: android.view.InflateException: Binary XML file line #16: Error inflating class <unknown>
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance(Native Method)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable()' on a null object reference
at android.support.design.widget.FloatingActionButton.access$001(FloatingActionButton.java:69)
at android.support.design.widget.FloatingActionButton$ShadowDelegateImpl.setBackgroundDrawable(FloatingActionButton.java:862)

showCreateShipperLayout是一种创建AlertDialog的方法，可让我注册新的托运人

我尝试删除浮动XML按钮，但没有崩溃。可能是错误吗？

activity_shippers_man的xml代码：

<?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:background="@drawable/background"
tools:context=".ShippersMan">
<android.support.v7.widget.RecyclerView
    android:id="@+id/recycler_shippers"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_add"
    android:layout_marginRight="16dp"
    android:layout_marginBottom="16dp"
    app:srcCompat="@drawable/ic_add_black_24dp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:tint="@android:color/white"
    app:fabSize="normal"
    android:backgroundTint="@color/colorAccent"/>
</RelativeLayout>

Answer 1

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab_add"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="16dp"
    android:layout_marginRight="16dp"
    android:src="@drawable/ic_add_black_24dp"
    android:tint="@android:color/white"
    app:backgroundTint="@color/colorAccent"
    app:fabSize="normal" />

错误FloatingActionButton

1 个答案: