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來自我的導航抽屜的片段包含兩個RelativeLayouts,這兩個RelativeLayouts應該充當按鈕以導航到兩個不同的活動。 這對於佈局的代碼:使用浮動操作按鈕時發生致命異常
<?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:background="#B3E5FC"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/existingClientChoiceLayout"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_alignParentTop="true"
android:background="@color/colorAccent">
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="126dp"
android:text="Existing Client"
android:textColor="@android:color/white"
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:id="@+id/newClientChoiceLayout"
android:layout_height="300dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@color/light_red">
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="138dp"
android:text="New Client"
android:textColor="@android:color/white"
android:textSize="20sp"
android:textStyle="bold" />
</RelativeLayout>
</RelativeLayout>
在活動的佈局我應該導航到existingClientChoiceLayout
,我有這樣的:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_new_client"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="judeochalifu.teylur.activities.NewClientActivity">
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_margin="14dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:src="@drawable/ic_menu_send"
app:fabSize="normal" />
</RelativeLayout>
的(相關)片段的代碼如下所示:現在
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.new_entry_layout, container, false);
existingClientChoiceLayout = (RelativeLayout) rootView.findViewById(R.id.existingClientChoiceLayout);
newClientChoiceLayout = (RelativeLayout) rootView.findViewById(R.id.newClientChoiceLayout);
existingClientChoiceLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(mContext, ExistingClientsViewActivity.class));
Toast.makeText(mContext, "Clicked", Toast.LENGTH_SHORT).show();
}
});
newClientChoiceLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(mContext, NewClientActivity.class));
}
});
return rootView;
}
,當我運行的代碼一切看起來fine.When我的選項單擊從導航菜單這個片段,我得到的WEIRD ERR或消息:
java.lang.ClassCastException:android.support.v7.widget.AppCompatTextView不能轉換到android.widget.RelativeLayout
E/AndroidRuntime: FATAL EXCEPTION: main
Process: judeochalifu.teylur, PID: 4746
java.lang.ClassCastException: android.support.v7.widget.AppCompatTextView cannot be cast to android.widget.RelativeLayout
at judeochalifu.teylur.fragments.NewEntryFragment.onCreateView(NewEntryFragment.java:47)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Application terminated.
但是,如果我刪除FAB,一切正常。
我已經搜索了相似的題目,但沒有匹配我的具體問題。
如果你不需要晶圓廠按鈕,刪除它,但如果你需要它,宣佈它。然後檢查fab是否爲空,如果不添加點擊監聽器。 – Stanojkovic
請爲每個示例代碼部分標題及其文件名稱。例如,在使用FAB XML的地方並不明顯。 – Knossos
你可以顯示在 onCreateView(NewEntryFragment.java:47) –