一切正常,如果你第二次发现你看到这个错误:
FATAL EXCEPTION: main
Process: ro.vrt.videoplayerstreaming, PID: 23662
java.lang.IllegalStateException: Already managing a GoogleApiClient with id 0
at com.google.android.gms.common.internal.zzx.zza(Unknown Source)
at com.google.android.gms.common.api.internal.zzw.zza(Unknown Source)
at com.google.android.gms.common.api.GoogleApiClient$Builder.zza(Unknown Source)
at com.google.android.gms.common.api.GoogleApiClient$Builder.zze(Unknown Source)
at com.google.android.gms.common.api.GoogleApiClient$Builder.build(Unknown Source)
at ro.vrt.videoplayerstreaming.Login.onCreateView(Login.java:75)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5849)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:763)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)
这是我的代码:
public class Login extends Fragment implements
GoogleApiClient.OnConnectionFailedListener,
View.OnClickListener {
private static final String TAG = "SignInActivity";
private static final …在搜索和搜索之后，我无法向 AndroidX 迈出完整的一步。我有导航抽屉的问题。
<android.support.design.internal.BottomNavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_main_page"
app:menu="@menu/activity_main_page_drawer" />
我已将导航视图更改为底部导航视图。
//NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
BottomNavigationView bottomNavView = (BottomNavigationView) findViewById(R.id.nav_view);
bottomNavView.setNavigationItemSelectedListener(this);
View headerView = bottomNavView.getHeaderView(0);
TextView navUsername = (TextView) headerView.findViewById(R.id.textnav);
navUsername.setText(str);
public class MainPageActivity extends AppCompatActivity
implements BottomNavigationView.OnNavigationItemSelectedListener {
但我不明白它的工作。现在出现其他错误，
错误：
找不到符号方法 setNavigationItemSelectedListener(MainPageActivity) bottomNavView.setNavigationItemSelectedListener(this); ^ 符号：方法 setNavigationItemSelectedListener(MainPageActivity) 找不到符号方法 getHeaderView(int) View headerView = bottomNavView.getHeaderView(0); ^ 符号：方法 getHeaderView(int)
我该如何解决所有这些错误？
我无法统一多个 pdf-lib 示例来为我工作。我想要执行与在现有 PDF 中添加文本和图像相同的功能。它总是给我错误，我不明白为什么。
const { degrees, PDFDocument, rgb, StandardFonts } = PDFLib
async function modifyPdf() {
// Fetch an existing PDF document
const url = 'https://pdf-lib.js.org/assets/with_update_sections.pdf'
const existingPdfBytes = await fetch(url).then(res => res.arrayBuffer());
// Embed the Helvetica font
const helveticaFont = await pdfDoc.embedFont(StandardFonts.Helvetica);
// Get the first page of the document
const pages = pdfDoc.getPages();
const firstPage = pages[0];
// Fetch JPEG image
const jpgUrl = 'https://pdf-lib.js.org/assets/cat_riding_unicorn.jpg';
const jpgImageBytes = await fetch(jpgUrl).then((res) => res.arrayBuffer());
// Load a PDFDocument …在一个片段中我想打开一个新活动,但是类是由字符串提取的.在toast中接收myclass.class,但是没有打开一个新类,如果从新类中更改"c",则代码可以正常工作.谢谢.
码:
if (item instanceof Movie) {
Log.d(TAG, "Item: " + item.toString());
String page = item.toString();
String pageFinal = page + ".class";
Toast.makeText(getActivity(), item.toString(),
Toast.LENGTH_LONG).show();
Class<?> c = null;
if(pageFinal != null) {
try {
c = Class.forName(pageFinal);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
Intent intent = new Intent(getActivity(), c);
getActivity().startActivity(intent);
}
日志:
03-07 08:42:19.872 18138-18138/ro.vrt.videoplayerstreaming W/System.err: Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
03-07 08:42:19.872 18138-18138/ro.vrt.videoplayerstreaming D/AndroidRuntime: Shutting down …