在我的Android应用中，我正在尝试在我的活动中创建一个片段，以显示来自admobs测试广告的广告。我正在学习本教程。 https://developers.google.com/mobile-ads-sdk/docs/admob/android/quick-start我在片段膨胀时遇到错误。
有谁知道出了什么问题？
由于
我的包裹名称：android.arin。
JAVA
package activity;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import user.Actor;
import user.User;
import widget.Popup;
import common.FieldValidation;
import common.Transition;
import http.Network;
import android.app.Activity;
import android.app.Fragment;
import android.app.NotificationManager;
import android.arin.R;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.CompoundButton.OnCheckedChangeListener;
import arin.ArinContext;
import async.recognition.Async_recognition;
import async.user.Async_forgot_password;
import async.user.Async_login;
import async.user.Async_register;
/*
* This activity handles the login activity.
*/
public class LoginScreen extends Activity {
// to keep track of the views on the screen
private EditText emailET = null;
private EditText passwordET = null;
private Button login = null;
private CheckBox checkbox = null;
public static final String MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_screen);
// clear notifications
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(Async_recognition.SCAN_COMPLETE_NOTIFICATION_ID);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login_screen, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
switch(id) {
case R.id.action_forgotpassword:
forgotPassword();
return true;
case R.id.action_offline_login:
offlineLoginButtonClick();
return true;
case R.id.action_register:
registerButtonClick();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onResume() {
super.onResume();
// checks if app started for first time
Boolean firstTime = emailET == null;
// reset cached data
logout();
// if first time, then set
if (firstTime) {
recordFields();
fillInFields();
handleAutoLogin();
}
}
private void logout() {
ArinContext.setUser(new User(this));
}
private void recordFields() {
emailET = (EditText)findViewById(R.id.email);
passwordET = (EditText)findViewById(R.id.password);
login = (Button) findViewById(R.id.loginButton);
checkbox = (CheckBox) findViewById(R.id.checkBox);
}
private void fillInFields() {
Actor user = ArinContext.getUser();
String email = user.getEmail();
String password = user.getPassword();
Boolean autoLogin = ArinContext.getUser().isAutoLogin();
if (email != null) emailET.setText(email);
if (autoLogin) {
if (password != null) passwordET.setText(password);
} else {
if (email == null) emailET.requestFocus();
else passwordET.requestFocus();
}
checkbox.setChecked(autoLogin);
}
private void handleAutoLogin() {
checkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
ArinContext.getUser().setAutoLogin(arg1);
}
});
if (checkbox.isChecked() && FieldValidation.isValidEmail(emailET.getText().toString()) && FieldValidation.isValidPassword(passwordET.getText().toString())) {
login.performClick();
}
}
public void goToNextScreen(String message) {
if (ArinContext.saveUserData(this)) {
Intent myIntent = new Intent(this, MenuScreen.class);
myIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
if (message != null) {
myIntent.putExtra(MESSAGE, message);
}
startActivity(myIntent);
Transition.TransitionForward(this);
} else {
Popup.ShowErrorMessage(this, R.string.localsaveerror, false);
}
}
/*
* click handlers
*/
public void loginButtonClick(View view) {
if (emailET != null && passwordET != null) {
String email = emailET.getText().toString();
String password = passwordET.getText().toString();
Actor user = ArinContext.getUser();
user.setEmail(email);
user.setPassword(password);
if (!FieldValidation.isValidEmail(email)) {
Popup.ShowErrorMessage(this, R.string.invalid_email, false);
} else if (!FieldValidation.isValidPassword(password)) {
Popup.ShowErrorMessage(this, R.string.invalid_password, false);
} else if (!Network.isNetworkAvailable(this)) {
goToNextScreen(getString(R.string.no_internet_offline_mode));
} else {
new Async_login(this, email, password);
}
}
}
private void offlineLoginButtonClick() {
goToNextScreen(getString(R.string.offline_mode));
}
private void forgotPassword() {
if (Network.isNetworkAvailable(this)) {
new Async_forgot_password(this);
} else {
Popup.ShowErrorMessage(this, R.string.no_internet, false);
}
}
private void registerButtonClick() {
if (Network.isNetworkAvailable(this)) {
new Async_register(this);
} else {
Popup.ShowErrorMessage(this, R.string.no_internet, false);
}
}
public static class AdFragment extends Fragment {
private AdView mAdView;
public AdFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_ad, container, false);
}
@Override
public void onActivityCreated(Bundle bundle) {
super.onActivityCreated(bundle);
// Gets the ad view defined in layout/ad_fragment.xml with ad unit ID set in
// values/strings.xml.
mAdView = (AdView) getView().findViewById(R.id.adView);
// Create an ad request. Check logcat output for the hashed device ID to
// get test ads on a physical device. e.g.
// "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.build();
// Start loading the ad in the background.
mAdView.loadAd(adRequest);
}
/** Called when leaving the activity */
@Override
public void onPause() {
if (mAdView != null) {
mAdView.pause();
}
super.onPause();
}
/** Called when returning to the activity */
@Override
public void onResume() {
super.onResume();
if (mAdView != null) {
mAdView.resume();
}
}
/** Called before the activity is destroyed */
@Override
public void onDestroy() {
if (mAdView != null) {
mAdView.destroy();
}
super.onDestroy();
}
}
}
XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
style="@style/RegularView"
tools:context="activity.LoginScreen" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:orientation="vertical" >
<ImageView
android:id="@+id/arinlogo"
android:contentDescription="@string/image_cd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/arinlogo" />
<EditText
android:id="@+id/email"
android:layout_marginTop="20dp"
android:layout_marginLeft="10sp"
android:layout_marginRight="10sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/hint_email"
android:singleLine="true"
android:maxLength="255"
android:ems="10"
android:gravity="center"
android:inputType="textEmailAddress" />
<EditText
android:id="@+id/password"
android:layout_margin="10sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/hint_password"
android:singleLine="true"
android:maxLength="255"
android:ems="10"
android:gravity="center"
android:inputType="textPassword" />
<CheckBox
android:id="@+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/auto_login" />
<Button
android:id="@+id/loginButton"
style="@style/CircleButton"
android:onClick="loginButtonClick"
android:text="@string/action_login" />
</LinearLayout>
<fragment
android:id="@+id/adFragment"
android:name="android.arin.activity.LoginScreen$AdFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
</RelativeLayout>
MANIFEST（这是在应用程序标记内）
<activity android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
android:theme="@android:style/Theme.Translucent" />
错误日志
01-05 00:09:05.127: E/AndroidRuntime(4978): FATAL EXCEPTION: main
01-05 00:09:05.127: E/AndroidRuntime(4978): java.lang.RuntimeException: Unable to start activity ComponentInfo{android.arin/activity.LoginScreen}: android.view.InflateException: Binary XML file line #65: Error inflating class fragment
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread.access$700(ActivityThread.java:143)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1241)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.os.Handler.dispatchMessage(Handler.java:99)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.os.Looper.loop(Looper.java:137)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread.main(ActivityThread.java:4950)
01-05 00:09:05.127: E/AndroidRuntime(4978): at java.lang.reflect.Method.invokeNative(Native Method)
01-05 00:09:05.127: E/AndroidRuntime(4978): at java.lang.reflect.Method.invoke(Method.java:511)
01-05 00:09:05.127: E/AndroidRuntime(4978): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
01-05 00:09:05.127: E/AndroidRuntime(4978): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
01-05 00:09:05.127: E/AndroidRuntime(4978): at dalvik.system.NativeStart.main(Native Method)
01-05 00:09:05.127: E/AndroidRuntime(4978): Caused by: android.view.InflateException: Binary XML file line #65: Error inflating class fragment
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
01-05 00:09:05.127: E/AndroidRuntime(4978): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:316)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Activity.setContentView(Activity.java:1915)
01-05 00:09:05.127: E/AndroidRuntime(4978): at activity.LoginScreen.onCreate(LoginScreen.java:52)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Activity.performCreate(Activity.java:5177)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)
01-05 00:09:05.127: E/AndroidRuntime(4978): ... 11 more
01-05 00:09:05.127: E/AndroidRuntime(4978): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment android.arin.activity.LoginScreen$AdFragment: make sure class name exists, is public, and has an empty constructor that is public
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Fragment.instantiate(Fragment.java:584)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Fragment.instantiate(Fragment.java:552)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Activity.onCreateView(Activity.java:4820)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
01-05 00:09:05.127: E/AndroidRuntime(4978): ... 21 more
01-05 00:09:05.127: E/AndroidRuntime(4978): Caused by: java.lang.ClassNotFoundException: android.arin.activity.LoginScreen$AdFragment
01-05 00:09:05.127: E/AndroidRuntime(4978): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
01-05 00:09:05.127: E/AndroidRuntime(4978): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
01-05 00:09:05.127: E/AndroidRuntime(4978): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
01-05 00:09:05.127: E/AndroidRuntime(4978): at android.app.Fragment.instantiate(Fragment.java:574)
01-05 00:09:05.127: E/AndroidRuntime(4978): ... 24 more
答案 0 :(得分：1)
使用
android:name="activity.LoginScreen$AdFragment"
在xml中，因为AdFragment片段位于LoginScreen活动中，与{-l}}一样位于android.arin.activity包中。