如何解决明显错误？

Question

您好，我面临无法在 android 中启动活动。我正在使用不同的软件包...所以请帮助我...当我运行此应用程序时，它会在下面给出

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="yougotag.com.pharmatnt" >
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/yougotag"
            android:label="@string/app_name"
            android:theme="@style/NewTheme" >
            <activity
                android:name=".usermanagement.usercreation.LoginActivity"
                android:label="@string/app_name"
                android:screenOrientation="portrait">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />

                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>

            <activity android:name=".usermanagement.usercreation.AccountInformation"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".usermanagement.usercreation.PersonalInfo"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".usermanagement.usercreation.AddressInfo"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".usermanagement.usercreation.TermsConditions"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".usermanagement.usercreation.ConsentActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".usermanagement.usercreation.SettingsDeletion"
                android:screenOrientation="portrait" ></activity>

            <activity android:name=".usermanagement.usercreation.VerifyAccountActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.ForgotUniqueIdActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.SendUniqueIdActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.ForgotPasswordActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.SendPasswordActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.HomeActivity"
                android:screenOrientation="portrait" ></activity>
            <activity android:name=".passwordmanagement.ChangePasswordNewActivity"
                android:screenOrientation="portrait" ></activity>



        </application>

    </manifest>

我的错误是这样的……

 04-23 19:10:13.000: E/cutils-trace(5674): Error opening trace file: No such file or directory (2)
04-23 19:10:13.214: E/memtrack(5674): Couldn't load memtrack module (No such file or directory)
04-23 19:10:13.214: E/android.os.Debug(5674): failed to load memtrack module: -2
04-23 19:10:13.824: E/cutils-trace(5693): Error opening trace file: No such file or directory (2)
04-23 19:10:14.007: E/memtrack(5693): Couldn't load memtrack module (No such file or directory)
04-23 19:10:14.007: E/android.os.Debug(5693): failed to load memtrack module: -2
04-23 19:10:14.244: E/AndroidRuntime(5704): FATAL EXCEPTION: main
04-23 19:10:14.244: E/AndroidRuntime(5704): Process: yougotag.com.pharmatnt, PID: 5704
04-23 19:10:14.244: E/AndroidRuntime(5704): java.lang.RuntimeException: Unable to start activity ComponentInfo{yougotag.com.pharmatnt/yougotag.com.pharmatnt.usermanagement.usercreation.LoginActivity}: java.lang.NullPointerException
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2350)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2402)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.app.ActivityThread.access$900(ActivityThread.java:151)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1333)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.os.Handler.dispatchMessage(Handler.java:110)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.os.Looper.loop(Looper.java:193)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at android.app.ActivityThread.main(ActivityThread.java:5304)
04-23 19:10:14.244: E/AndroidRuntime(5704):     at java.lang.reflect.Method.invokeNative(Native Method)

所以请告诉我如何解决它...我遇到了问题...

Answer 1

您在清单中错误地引用了您的活动名称。没有名为

的活动

.usermanagement.usercreation.LoginActivity

通过使用 .运营商，您可以直接访问您的活动。所以把 Activity 名字前面的 App 名字去掉。

谢谢

Answer 2

你必须指定目标SDK和最低SDK版本，所以添加：

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />

Answer 3

您在清单标记（第 3 行）中打包是- yougotag.com.pharmatnt

您已经给出了这样的启动活动名称- .usermanagement.usercreation.LoginActivity

'.'第一个符号表示您的活动位于以下路径 - yougotag.com.pharmatnt\usermanagement.usercreation.LoginActivity

（包\你的活动名称）

所以在清单标签中提供正确的包名

Answer 4

在我的清单文件中，一切都指向正确的方向......但是我做错了两件事 1) 我们的包名必须是小写字母 2) 在 oncreate 方法中我给出了错误的东西。