Android 出错

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.web.datasave"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="19"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.web.datasave.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

Error:

[2015-04-01 22:54:20 - datasave] ------------------------------
[2015-04-01 22:54:20 - datasave] Android Launch!
[2015-04-01 22:54:20 - datasave] adb is running normally.
[2015-04-01 22:54:20 - datasave] Performing com.web.datasave.MainActivity activity launch
[2015-04-01 22:54:20 - datasave] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'iPhone'
[2015-04-01 22:54:22 - datasave] Application already deployed. No need to reinstall.
[2015-04-01 22:54:22 - datasave] Starting activity com.web.datasave.MainActivity on device emulator-5554
[2015-04-01 22:54:24 - datasave] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.web.datasave/.MainActivity }
[2015-04-01 22:54:24 - datasave] ActivityManager: Warning: Activity not started, its current task has been brought to the front

解决：

把activity android:name=".MainActivity" 后面的路径写全，别直接写".MainActivity ；需写成： android:name="com.web.datasave.MainActivity"