我已经实现了Android标签布局。我创建了五个名为one_fragment的片段，两个片段....五个片段。
我的XML名称five_fragment.xml
<RelativeLayout 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="com.unss.pa.bdapp.one_fragment"
android:background="#FFFFFF">
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="1"
android:paddingRight="15dp"
android:paddingLeft="15dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Give your feedback to improve this app better."
android:textSize="20dp"
android:textStyle="bold"
android:textColor="#800000"
android:typeface="serif"
android:layout_marginTop="20dp"
android:id="@+id/textView05"
android:textAlignment="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Your name"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="20dp"
android:typeface="serif"
android:textColor="#000000"
android:layout_marginTop="20dp"
android:textAlignment="center"
android:id="@+id/textView01" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:text=""
android:ems="10"
android:background="@drawable/edit_text"
android:id="@+id/editText01"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="\nYour email*"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="20dp"
android:typeface="serif"
android:textColor="#000000"
android:layout_marginTop="20dp"
android:textAlignment="center"
android:id="@+id/textView02" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:background="@drawable/edit_text"
android:id="@+id/editText2" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="\nYour feedback"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="20dp"
android:typeface="serif"
android:textColor="#000000"
android:layout_marginTop="20dp"
android:id="@+id/textView03"
android:textAlignment="center"/>
<EditText
android:layout_width="match_parent"
android:layout_height="175dp"
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/editText3"
android:layout_weight="0.23"
android:background="@drawable/edit_text"/>
<Button
android:layout_width="100dp"
android:layout_height="100dp"
android:background="@drawable/send"
android:id="@+id/button01f"
android:layout_gravity="center_horizontal"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="\n"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="2dp"
android:typeface="serif"
android:textColor="#000000"
android:layout_marginTop="20dp"
android:id="@+id/textView07" />
</LinearLayout>
</ScrollView>
</RelativeLayout>
我的主要活动中的适配器
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
adapter.addFragment(new ListContentFragment(), "Screen1");
adapter.addFragment(new one_fragment(), "Screen2");
adapter.addFragment(new CardContentFragment(), "Screen3");
adapter.addFragment(new two_fragment(), "Screen4");
adapter.addFragment(new CardContentFragment(), "Screen5");
adapter.addFragment(new TileContentFragment(), "Screen6");
adapter.addFragment(new three_fragment(), "Screen7");
adapter.addFragment(new five_fragment(), "Feedback");
viewPager.setAdapter(adapter);
}
我的five_fragment.java
public class five_feedback extends Fragment implements View.OnClickListener{
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
public Button btn;
public EditText t1;
public EditText t2;
public EditText t3;
public five_feedback() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
btn = (Button) getView().findViewById(R.id.button01f);
t1 = (EditText) getView().findViewById(R.id.editText01) ;
t2 = (EditText) getView().findViewById(R.id.editText2) ;
t3 = (EditText) getView().findViewById(R.id.editText3) ;
btn.setOnClickListener(this);
return inflater.inflate(R.layout.five_fragment, container, false);
}
@Override
public void onClick(View v) {
if( t2.getText().toString().trim().equals("")){
Snackbar.make(v, "Email Required",
Snackbar.LENGTH_LONG).show();
} else {
String to = "pbharadwaj777@gmail.com";
String message = t2.getText().toString();
String subject = "Feedback";
Intent mEmail = new Intent(Intent.ACTION_SEND);
mEmail.putExtra(Intent.EXTRA_EMAIL, new String[]{ to});
mEmail.putExtra(Intent.EXTRA_SUBJECT, subject);
mEmail.putExtra(Intent.EXTRA_TEXT, message);
// prompts to choose email client
mEmail.setType("message/rfc822");
startActivity(Intent.createChooser(mEmail, "Choose an email client to send your feedback!"));
}
}
}
当我安装open时，我可以打开应用程序。我可以从屏幕1滑动到屏幕7.然而，当我打开反馈时，应用程序崩溃了。有什么问题？
答案 0 :(得分：0)
问题是您在实际充气之前尝试访问该视图。将您的onCreateView更改为以下内容，或者您也可以将findViewById和setOnClickListener代码移至Fragment的{{3}}功能。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.five_fragment, container, false);
btn = (Button) view.findViewById(R.id.button01f);
t1 = (EditText) view.findViewById(R.id.editText01) ;
t2 = (EditText) view.findViewById(R.id.editText2) ;
t3 = (EditText) view.findViewById(R.id.editText3) ;
btn.setOnClickListener(this);
return view;
}