我没有其他方法可以问这个问题，所以这是我的问题：我有一个用于两个应用程序的库项目，并且运行良好。现在我有两个应用程序的通用登录页面和登录功能，并且为了避免重复代码，我想为两个应用程序使用相同的登录活动。这是我使用的代码
图书馆项目
public class CanteenPreference {
// Static variables declaration
private static final String KEY_INSTANCE_URL = "instance_url";
private static final String KEY_USER_NAME = "user_name_preferences";
private static final String KEY_ACCESS_KEY = "access_key_preferences";
public static final String DEFAULT_URL = "some url";
private static final String URL_SUFFIX = "/api/call";
/**
* Gets the preferred url.
*
* @param activity
* @return
*/
public static String getUrl(Activity activity){
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity.getApplicationContext());
String previousURL = sharedPrefs.getString(KEY_INSTANCE_URL, null);
if (previousURL == null) {
Intent in=new Intent(activity,LoginActivity.class);
activity.startActivity(in);
previousURL = sharedPrefs.getString(KEY_INSTANCE_URL, DEFAULT_URL + URL_SUFFIX);
}
return previousURL;
}
/**
* Gets the preferred user name.
*
* @param activity
* @return
*/
public static String getUserName(Activity activity){
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity.getApplicationContext());
String previousUsername = sharedPrefs.getString(KEY_USER_NAME, null);
if (previousUsername == null) {
activity.startActivity(new Intent(activity, LoginActivity.class));
previousUsername = sharedPrefs.getString(KEY_USER_NAME, "test");
}
return previousUsername;
}
/**
* Gets the preferred password.
*
* @param activity
* @return
*/
public static String getPassword(Activity activity){
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity.getApplicationContext());
String previousPassword = sharedPrefs.getString(KEY_ACCESS_KEY, null);
if (previousPassword == null) {
activity.startActivity(new Intent(activity, LoginActivity.class));
previousPassword = sharedPrefs.getString(KEY_ACCESS_KEY, "test");
}
return previousPassword;
}
/**
* Writes the preferences
*
* @param activity
* @param url
* @param userName
* @param password
* @return true if committed
*/
public static boolean write(Activity activity, String url, String userName, String password){
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity.getApplicationContext());
SharedPreferences.Editor prefEditor = sharedPrefs.edit();
prefEditor.putString(KEY_INSTANCE_URL, url + URL_SUFFIX);
prefEditor.putString(KEY_USER_NAME, userName);
prefEditor.putString(KEY_ACCESS_KEY, password);
return prefEditor.commit();
}
}
和图书馆中的登录活动
public class LoginActivity extends Activity {
private EditText mUrlInput;
private EditText mUserInput;
private EditText mPasswordInput;
private Button mButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_page);
mButton = (Button) findViewById(R.id.loginButt);
mUrlInput = (EditText) findViewById(R.id.urlInput);
mUserInput = (EditText) findViewById(R.id.userInput);
mPasswordInput = (EditText) findViewById(R.id.passwordInput);
mUrlInput.setText(CanteenPreference.DEFAULT_URL);
mButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
final String url = mUrlInput.getText().toString();
final String userName = mUserInput.getText().toString();
final String password = mPasswordInput.getText().toString();
if (url == null || url.length() == 0 || userName == null
|| userName.length() == 0 || password == null
|| password.length() == 0) {
Toast toast = Toast.makeText(LoginActivity.this,
"All fields are required", Toast.LENGTH_SHORT);
toast.show();
} else {
Thread loginThread = new Thread() {
@Override
public void run() {
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair(
"username", userName));
nameValuePairs.add(new BasicNameValuePair(
"password", password));
httpPost.setEntity(new UrlEncodedFormEntity(
nameValuePairs));
HttpResponse httpResponse = httpClient
.execute(httpPost);
if (httpResponse.getStatusLine()
.getStatusCode() != HttpStatus.SC_OK) {
throw new Exception("Invalid credentials !");
}
} catch (Exception e) {
Log.d("Login: ", "Invalid credentials", e);
Toast toast = Toast.makeText(
LoginActivity.this,
"Invalid credentials",
Toast.LENGTH_SHORT);
toast.show();
}
// write the preferences
CanteenPreference.write(LoginActivity.this, url,
userName, password);
// finish the activity
LoginActivity.this.finish();
}
};
loginThread.start();
}
}
});
}
}
我已经在应用程序和库清单中定义了登录活动，但我仍然关注 logcat`
09-07 16:00:12.436: W/ActivityThread(1429): Application com.jumbybay.ferry is waiting for the debugger on port 8100...
09-07 16:00:12.465: I/System.out(1429): Sending WAIT chunk
09-07 16:00:12.465: I/dalvikvm(1429): Debugger is active
09-07 16:00:12.476: I/System.out(1429): Debugger has connected
09-07 16:00:12.476: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:12.685: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:12.836: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:12.896: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:12.896: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:13.096: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:13.306: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:13.336: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:13.346: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:13.505: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:13.708: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:13.836: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:13.856: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:13.906: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:14.106: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:14.306: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:14.376: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:14.385: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:14.515: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:14.717: I/System.out(1429): waiting for debugger to settle...
09-07 16:00:14.846: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:14.866: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:14.916: I/System.out(1429): debugger has settled (1325)
09-07 16:00:15.356: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:15.375: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:15.866: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:15.886: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:15.886: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:16.375: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:16.385: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:16.385: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:16.866: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:16.876: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:16.886: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:17.375: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:17.385: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:17.385: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:17.886: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:17.896: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:17.896: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:18.385: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:18.395: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:18.395: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:18.896: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:18.906: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:18.906: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:19.395: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:19.405: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:19.405: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:19.896: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:19.916: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:19.916: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:20.395: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:20.415: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:20.415: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:20.906: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:20.926: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:20.926: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:21.405: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:21.425: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:21.425: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:00:21.916: I/dalvikvm(1429): threadid=3: reacting to signal 3
09-07 16:00:21.926: D/dalvikvm(1429): threadid=1: still suspended after undo (sc=1 dc=1)
09-07 16:00:21.936: I/dalvikvm(1429): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:01:15.126: W/ActivityThread(1470): Application com.jumbybay.ferry is waiting for the debugger on port 8100...
09-07 16:01:15.176: I/System.out(1470): Sending WAIT chunk
09-07 16:01:15.176: I/dalvikvm(1470): Debugger is active
09-07 16:01:15.385: I/System.out(1470): Debugger has connected
09-07 16:01:15.385: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:15.585: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:15.787: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:15.996: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:16.195: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:16.399: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:16.601: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:16.795: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:16.996: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:17.207: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:17.408: I/System.out(1470): waiting for debugger to settle...
09-07 16:01:17.610: I/System.out(1470): debugger has settled (1403)
09-07 16:02:10.908: D/AndroidRuntime(1470): Shutting down VM
09-07 16:02:10.908: W/dalvikvm(1470): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-07 16:02:11.056: E/AndroidRuntime(1470): FATAL EXCEPTION: main
09-07 16:02:11.056: E/AndroidRuntime(1470): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jumbybay.ferry/com.jumbybay.ferry.FerryMain}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.jumbybay.ferry/com.jumbybay.activity.LoginActivity}; have you declared this activity in your AndroidManifest.xml?
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread.access$600(ActivityThread.java:123)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.os.Handler.dispatchMessage(Handler.java:99)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.os.Looper.loop(Looper.java:137)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread.main(ActivityThread.java:4424)
09-07 16:02:11.056: E/AndroidRuntime(1470): at java.lang.reflect.Method.invokeNative(Native Method)
09-07 16:02:11.056: E/AndroidRuntime(1470): at java.lang.reflect.Method.invoke(Method.java:511)
09-07 16:02:11.056: E/AndroidRuntime(1470): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-07 16:02:11.056: E/AndroidRuntime(1470): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-07 16:02:11.056: E/AndroidRuntime(1470): at dalvik.system.NativeStart.main(Native Method)
09-07 16:02:11.056: E/AndroidRuntime(1470): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.jumbybay.ferry/com.jumbybay.activity.LoginActivity}; have you declared this activity in your AndroidManifest.xml?
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1508)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1384)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Activity.startActivityForResult(Activity.java:3190)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Activity.startActivity(Activity.java:3297)
09-07 16:02:11.056: E/AndroidRuntime(1470): at com.jumbybay.activity.CanteenPreference.getUrl(CanteenPreference.java:32)
09-07 16:02:11.056: E/AndroidRuntime(1470): at com.jumbybay.ferry.FerryMain.onCreate(FerryMain.java:42)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Activity.performCreate(Activity.java:4465)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
09-07 16:02:11.056: E/AndroidRuntime(1470): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
09-07 16:02:11.056: E/AndroidRuntime(1470): ... 11 more
09-07 16:02:11.716: I/dalvikvm(1470): threadid=3: reacting to signal 3
09-07 16:02:11.736: I/dalvikvm(1470): Wrote stack traces to '/data/anr/traces.txt'
09-07 16:07:11.416: I/Process(1470): Sending signal. PID: 1470 SIG: 9
清单文件主要活动
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jumbybay.ferry"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="10" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity android:name=".FerryMain" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ferryBlur" >
</activity>
<activity android:name=".PassengerList" >
</activity>
<activity android:name=".com.jumbybay.activity.LoginActivity" >
</activity>
<activity android:name=".TripIn" >
</activity>
</application>
</manifest>
清单文件库
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jumbybay.activity"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-feature android:name="android.hardware.nfc" />
<application>
<activity
android:name=".LoginActivity"
android:label="Jumbybay : Canteen" >
</activity>
<activity android:name=".NfcReaderActivity" >
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>