Android from hardware to application: Step by Step 6--write app test framework layer Hardware service (end)

Create Android Application project: Create Android project using Eclipse's Android plugin ADT, project name Gpio, copy the project catalog to the packages/apps/folder after creation is complete, and delete the Gen folder under the project directory, without deleting the words will cause the class to repeat the error.

Src/com/android/gpio/gpio.java:

Package Com.android.gpio;  Import COM.ANDROID.GPIO.R;  Import android.app.Activity;  Import Android.os.ServiceManager;  Import Android.os.Bundle;  Import Android.os.IGpioService;  Import android.os.RemoteException;  Import Android.util.Log;  Import Android.view.View;  Import Android.view.View.OnClickListener;  Import Android.widget.Button;   public class Gpio extends Activity implements Onclicklistener {private final static String Log_tag = "Com.android.Gpio";  Private Igpioservice gpioservice = null;  Private Button Setbutton = null;    Private Button Clearbutton = null; /** called when the activity is first created.  */@Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);  Setcontentview (R.layout.main);  Gpioservice = IGpioService.Stub.asInterface (Servicemanager.getservice ("Gpio"));  Setbutton = (Button) Findviewbyid (R.id.button_set);  Clearbutton = (Button) Findviewbyid (r.id.button_clear);  Setbutton.setonclicklistener (this); ClearbuttOn.setonclicklistener (this);  } @Override public void OnClick (View v) {if (V.equals (Setbutton)) {try{int val= ' 1 '; Gpioservice.setval (val);} catch (RemoteException e) {LOG.E (Log_tag, "setting value");}}   else if (v.equals (Clearbutton)) {try{int val= ' 0 '; Gpioservice.setval (Val);   } catch (RemoteException e) {log.e (Log_tag, "setting value");   }   }  }  }

Layout res/layout/main.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout  xmlns:android= "http://schemas.android.com/apk/ Res/android "     android:orientation=" vertical "     android:layout_width=" fill_parent "     android:layout_ height= "Fill_parent" >     <button       android:id= "@+id/button_clear" android:layout_width= "Match_       Parent "       android:layout_height=" wrap_content "       android:text=" @string/clear "       android:textstyle=" bold "       android:layout_margintop= "140DP"/>   <button       android:id= "@+id/button_set"       android: Layout_width= "Match_parent"       android:layout_height= "wrap_content"       android:text= "@string/set"       Android:textstyle= "Bold"        android:layout_margintop= "0DP"/></linearlayout>  

String Res/values/strings.xml:

<?xml version= "1.0" encoding= "Utf-8"?>  <resources>     <string name= "App_name" >gpio</ string>     <string name= "set" >Set</string>     <string name= "Clear" >Clear</string>  </resources>  

Androidmanifest.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <manifest  xmlns:android= "http://schemas.android.com/apk/res/ Android "    package=" Com.android.gpio "    android:versioncode=" 1 "    android:versionname=" 1.0 ">    < Application android:icon= "@drawable/ic_launcher" android:label= "@string/app_name" >      <activity android: Name= ". Gpio "                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>   

Edit project directory under Android.mk:

Local_path:= $ (call My-dir) include $ (clear_vars) Local_module_tags: = Optionallocal_src_files: = $ (call All-subdir-java-files) Local_package_name: = gpiolocal_certificate: = Platforminclude $ (BUILD_PACKAGE) include $ (call all-makefiles-under,$ (Local_path))

Edit build/target/product/generic_no_telephony.mk:

In product_packages: = \ after adding GPIO \

Compiling the project will generate gpio.apk

In this step, everything is ready to start updating the filesystem of the target board AM335EVM: (left host, EVM right)

out/target/product/am335xevm_sk/system/app/gpio.apk                 ==>   rootfs/out/target/product/am335xevm_sk/ System/framework/services.jar       ==>   rootfs/system/framework/out/target/product/am335xevm_sk/system/ Framework/framework.jar      ==>   rootfs/system/framework/out/target/product/am335xevm_sk/obj/lib/ libandroid_servers.so       ==>   rootfs/system/lib/out/target/product/am335xevm_sk/obj/lib/gpio.default.so             ==>   rootfs/system/lib/hw/

Make sure the Rootfs under Ueventd.rc has been added: (Android from hardware to app: Step up 3--Hardware abstraction layer access hardware driver mentioned)

/dev/adrio                0666   root       root

Start, install gpio.apk, open Gpio:

Phenomenon:

Click on the "Set" button:     D1 light    Click on the "Clear" button:   D1 light off

It can be seen that the written app has successfully operated the AM335 register by invoking the hardware service, changing the am335x_gpio_led4 level, and controlling the light-off of the LED D1 through n-Groove MOS devices.

Android from hardware to application: Step by Step 6--write app test framework layer Hardware service (end)