开发Android应用程序来使用硬件访问服务
16lz
2021-01-23
1、开发Android应用程序来使用硬件访问服务
~/android-2.3_r1/packages/experimental/Freg
----AndroidManifest.java
----Android.mk
----src
----shy/luo/freg
----Freg.java
----res
----layout
----main.xml
----values
----string.xml
----drawable
----icon.png
Freg.java
package shy.luo.freg;import android.app.Activity;import android.os.ServiceManager;import android.os.Bundle;import android.os.IFregService;import android.os.RemoteException;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class Freg extends Activity implements OnClickListener {private final static String LOG_TAG = "shy.luo.freg.FregActivity";private IFregService fregService = null;private EditText valueText = null;private Button readButton = null;private Button writeButton = 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);fregService = IFregService.Stub.asInterface(ServiceManager.getService("freg")); valueText = (EditText)findViewById(R.id.edit_value); readButton = (Button)findViewById(R.id.button_read); writeButton = (Button)findViewById(R.id.button_write); clearButton = (Button)findViewById(R.id.button_clear);readButton.setOnClickListener(this);writeButton.setOnClickListener(this);clearButton.setOnClickListener(this); Log.i(LOG_TAG, "Freg Activity Created"); } @Override public void onClick(View v) { if(v.equals(readButton)) {try { int val = fregService.getVal(); String text = String.valueOf(val); valueText.setText(text);} catch (RemoteException e) {Log.e(LOG_TAG, "Remote Exception while reading value from freg service.");} } else if(v.equals(writeButton)) {try { String text = valueText.getText().toString(); int val = Integer.parseInt(text);fregService.setVal(val);} catch (RemoteException e) {Log.e(LOG_TAG, "Remote Exception while writing value to freg service.");} } else if(v.equals(clearButton)) { String text = ""; valueText.setText(text); } }}
<?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" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:gravity="center"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/value"> </TextView> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/edit_value" android:hint="@string/hint"> </EditText> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center"> <Button android:id="@+id/button_read" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/read"> </Button> <Button android:id="@+id/button_write" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/write"> </Button> <Button android:id="@+id/button_clear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/clear"> </Button> </LinearLayout></LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?><resources> <string name="app_name">Freg</string> <string name="value">Value</string> <string name="hint">Please input a value...</string> <string name="read">Read</string> <string name="write">Write</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="shy.luo.freg" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".Freg" 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>
Android.mk
LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE_TAGS := optionalLOCAL_SRC_FILES := $(call all-subdir-java-files)LOCAL_PACKAGE_NAME := Freginclude $(BUILD_PACKAGE)
2、编译
编译成apk:
生成的Freg.apk位于out/target/product/generic/system/app中。
打包:
最后把Freg.apk重新打包进入system.img,位于out/target/product/gerneric中。
运行:
结果如下:
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