我正在尝试使按钮从片段布局转到xml文件。但是，在运行该应用程序时，我无法单击该按钮。我已经检查过我是否必须更正ID。就是这种情况。有人知道答案为何不会触发我的onClickListener（）吗？我觉得我想念的东西很小，但是我不知道到底是什么。谢谢 ！
我的课：
default我的xml在布局文件夹中：
public class AccountFragment extends Fragment {
private FragmentActivity myContext;
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
private View RootView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onAttach(Activity activity) {
myContext=(FragmentActivity) activity;
super.onAttach(activity);
}
private static final String TAG = AccountFragment.class.getSimpleName();
private static final String ARG_SECTION_NUMBER = "section_number";
public static final int TAB_PRIVATE = 1;
public static final int TAB_CORP = 2;
public AccountFragment() {
}
public static AccountFragment newInstance(int sectionNumber) {
AccountFragment fragment = new AccountFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RootView = inflater.inflate(R.layout.fragment_account, container, false);
Log.i(TAG, "onCreateView()");
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(myContext.getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) RootView.findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
//BUTTON
Button openSettingsButton = RootView.findViewById(R.id.open_settings);
openSettingsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getContext(), PreferenceFragmentAccount.class);
startActivity(i);
}
});
return RootView;
}
@Override
public void onResume() {
Log.i(TAG, "onResume()");
super.onResume();
View view = getView();
if (view == null) {
Log.e(TAG, "view is null!");
return;
}
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getContext());
String username=null;
String email=null;
String firstname=null;
String lastname=null;
String phoneNumber=null;
username = sharedPreferences.getString(USERNAME, null);
email = sharedPreferences.getString(EMAIL, null);
firstname = sharedPreferences.getString(FIRSTNAME, null);
lastname = sharedPreferences.getString(LASTNAME, null);
phoneNumber = sharedPreferences.getString(PHONE, null);
ImageView qrCode = view.findViewById(R.id.qr);
qrCode.setImageDrawable(getResources().getDrawable(R.drawable.ic_hourglass_full_teal_24dp));
if (TextUtils.isEmpty(username)) {
username = getString(R.string.no_name);
}
VCard vCard = new VCard(username)
.setEmail(email)
.setName(firstname + lastname)
.setPhoneNumber(phoneNumber);
WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
view.getHeight();
Display display = wm.getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int qrSize = (int) (0.8 * (double) Math.min(size.x, size.y));
setTextToTextViewOrHide(username, R.id.username, view);
setTextToTextViewOrHide(email, R.id.email, view);
setTextToTextViewOrHide(firstname, R.id.firstname, view);
setTextToTextViewOrHide(lastname, R.id.lastname, view);
setTextToTextViewOrHide(phoneNumber, R.id.phoneNumber, view);
new SetQrCodeTask().execute(new SetQrCodeTaskBundle(vCard, qrSize));
}
private void setTextToTextViewOrHide(String value, @IdRes int id, View view) {
TextView textView = view.findViewById(id);
if (TextUtils.isEmpty(value)) {
textView.setVisibility(View.GONE);
} else {
textView.setText(value);
}
}
private class SetQrCodeTaskBundle {
private VCard mVCard;
private int mQrSize;
SetQrCodeTaskBundle(VCard vCard, int qrSize) {
mVCard = vCard;
mQrSize = qrSize;
}
VCard getVCard() {
return mVCard;
}
int getQrSize() {
return mQrSize;
}
}
private class SetQrCodeTask extends AsyncTask<SetQrCodeTaskBundle, Void, Bitmap> {
private final String TAG = SetQrCodeTask.class.getSimpleName();
@Override
protected Bitmap doInBackground(SetQrCodeTaskBundle... setQrCodeTaskBundles) {
Log.d(TAG, "Generate QR code");
return QRCode
.from(setQrCodeTaskBundles[0].getVCard())
.withColor(0xFF000000, 0x00000000)
.withSize(setQrCodeTaskBundles[0].getQrSize(), setQrCodeTaskBundles[0].getQrSize())
.withHint(EncodeHintType.CHARACTER_SET, "UTF-8")
.bitmap();
}
@Override
protected void onPostExecute(Bitmap bitmap) {
Log.d(TAG, "Set QR code");
ImageView qrCode = getView().findViewById(R.id.qr);
qrCode.setImageBitmap(bitmap);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a ContactInfoFragment (defined as a static inner class below).
return AccountFragment.newInstance(position + 1);
}
@Override
public int getCount() {
// Show 3 total pages.
return 2;
}
}
}
答案 0 :(得分：0)
我已经在Android Studio上检查了您的代码，代码完美无缺，但是您在父级 RelativeLayout 上方将 Viewpager 设置为一个错误 匹配父项，因此您不会获得单击按钮的权利，但是如果将Viewpager重构到按钮下方，您将能够获得单击。
这是您可以做的。我已经安装了AndroidX，因此代码在其中
<?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="wrap_content"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true">
<android.support.v7.widget.CardView
android:id="@+id/cardView"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="12dp"
android:layout_marginRight="12dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/username"
style="@style/TextAppearance.AppCompat.Large"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:icon="@drawable/ic_person_teal_24dp"
android:inputType="textPersonName"
android:summary="%s"
android:textColor="@color/primary_dark"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="Name" />
<TextView
android:id="@+id/email"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/username"
tools:text="E-mail" />
<TextView
android:id="@+id/firstname"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/email"
tools:text="First name" />
<TextView
android:id="@+id/lastname"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/firstname"
tools:text="Last name" />
<TextView
android:id="@+id/phoneNumber"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="6dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/lastname"
tools:text="phoneNumber" />
<View
android:id="@+id/view"
android:layout_width="0dp"
android:layout_height="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/phoneNumber"
tools:ignore="MissingConstraints" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
<Button
android:id="@+id/open_settings"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10dp"
android:text="@string/open_settings"
tools:layout_editor_absoluteX="8dp"
tools:layout_editor_absoluteY="43dp" />
<ImageView
android:id="@+id/qr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="24dp"
android:contentDescription="@string/qr_code"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/open_settings"
app:srcCompat="@drawable/ic_hourglass_full_teal_24dp" />
<androidx.viewpager.widget.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="554dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:layout_editor_absoluteY="105dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
</RelativeLayout>
答案 1 :(得分：0)
为什么不使用butterknife
添加到gradle->
实现'com.jakewharton：butterknife：9.0.0-rc2'
annotationProcessor'com.jakewharton：butterknife-compiler：9.0.0-rc2'
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RootView = inflater.inflate(R.layout.fragment_account, container, false);
ButterKnife.bind(this, RootView );
...
return RootView;
}
@OnClick(R.id.open_settings)
public void btn(){
Intent i = new Intent(getContext(), PreferenceFragmentAccount.class);
startActivity(i);
}
okey，因此您可以像这样更改源：
Button openSettingsButton;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RootView = inflater.inflate(R.layout.fragment_account, container, false);
Log.i(TAG, "onCreateView()");
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(myContext.getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) RootView.findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
//BUTTON
openSettingsButton = RootView.findViewById(R.id.open_settings);
return RootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
openSettingsButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(getContext(), PreferenceFragmentAccount.class);
startActivity(i);
}
});
}