OverView

  1. Create a normal Anroid Application

  2. Create a Service Application

  3. Create a system apk

Create a system apk

a AndroidManifest.xml

package="com.xxx.autotriggersystemtask"
android:sharedUserId="android.uid.system"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <service
        android:name=".AutoTriggerSystemService"
        android:enabled="true" >
        <intent-filter>
            <action android:name="com.xxx.AutoTriggerSystemTask" />
        </intent-filter>
    </service>
</application>

b AndroidManifest.xml

Problems

  1. A resource exists with a different case

The project was not built due to "A resource exists with a different case: '/AutoTriggerSystemTask/bin/classes/com/xxx/Autotriggersystemtask'.". Fix the problem, then try refreshing this project and building it since it may be inconsistent

Solution: package name 在AndroidManifest和实际文件中的大小写不一致

package="com.xxx.autotriggersystemtask"

package com.xxx.Autotriggersystemtask;

  1. INSTALL_FAILED_SHARED_USER_INCOMPATIBLE

Details

 [2012-10-20 11:10:39 - AutoTriggerSystemTask] Installing AutoTriggerSystemTask.apk...
 [2012-10-20 11:10:40 - AutoTriggerSystemTask] Installation error: INSTALL_FAILED_SHARED_USER_INCOMPATIBLE
 [2012-10-20 11:10:40 - AutoTriggerSystemTask] Please check logcat output for more details.
 [2012-10-20 11:10:40 - AutoTriggerSystemTask] Launch canceled!

Reference

Android.mk

 LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)

 LOCAL_MODULE_TAGS := debug

 LOCAL_SRC_FILES := $(call all-java-files-under, src)

 LOCAL_PROGUARD_FLAG_FILES := proguard.flags(unneccessary )

 LOCAL_PACKAGE_NAME :=  AutoTriggerSystemTask
 LOCAL_CERTIFICATE := platform

 include $(BUILD_PACKAGE)

 include $(BUILD_MULTI_PREBUILT)(unneccessary )

 include $(call all-makefiles-under, $(LOCAL_PATH))
  1. How to solve Error: This attribute must be localized. (at 'text' with value 'BOTTOM_LEFT')

Decription

xml

<TextView 
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="BOTTOM_LEFT" />

Analysis

Best practice for Android apps is to define all of the non-dynamic content in resource files. This lets you define different resource files for different languages, for example. Normally, this is just a recommendation and the Android SDK doesn't complain if you hard-code values in your layout xml. The Android source build system, however, requires that all strings be defined in a "values" resource. This is probably intended to protect system builders from accidentally leaving content in a system image that won't display in the user's chosen language.

solution 1

use

LOCAL_MODULE_TAGS := tests

in the Android.mk to omits the localization check.

Another way is to disable localization check in build system. Comment the line 81 in build/core/package.mk

#LOCAL_AAPT_FLAGS := $(LOCAL_AAPT_FLAGS) -z

solution 2

What you need to do is move those string values out of the layout and define them in res/values/ instead. The usual place for string values is in res/values/strings.xml, but the actual file can be named anything you like as long as it's in that directory.

For example, in res/values/string.xml:

TOP_LEFT And in your main.xml layout, refer to the content by name:

android:text="@string/topLeftContent"

For more details on the how and why of this, see Google's documentation on Localization in Android.

Reference

Android文件或文件夹内容改变监听器（FileObserver）