Develop Android applications to use hardware to access services

1. Develop Android applications to use hardware to access services

~ /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);    }    }}

Main. xml

Strings. xml

 
     
  
   Freg
      
  
   Value
      
  
   Please input a value...
      
  
   Read
      
  
   Write
      
  
   Clear
  
 

AndroidManifest. xml

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. Compile

Compile to apk:

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Repackage freg.apk to system. img, which is located in out/target/product/gerneric.

Run:

The result is as follows: