友善之臂Mini6410之Android开发学习笔记（3）-ADC Demo

超、凢脫俗 2022-06-13 00:56 167阅读 0赞

友善之臂Mini6410之Android开发学习笔记源码同步更新，请使用git工具进行同步。关于Git工具更多信息，请参考：[http://progit.org/book/zh/][http_progit.org_book_zh]

git clone https://code.google.com/p/androiddemoformini6410/

ADCActivity.java

package com.mini6410.ADC;
    
    import java.util.Timer;
    import java.util.TimerTask;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.util.Log;
    import android.widget.TextView;
    
    import com.friendlyarm.AndroidSDK.HardwareControler;
    import com.mini6410.R;
    
    /**
     * 
     * ClassName:ADCActivity
     * Reason:	 ADC Demo
     *
     * @author   snowdream
     * @version  
     * @since    Ver 1.1
     * @Date	 2011	2012-03-16		12:04
     *
     * @see 	 
     */
    public class ADCActivity extends Activity {
    	private static final String TAG = "ADCActivity";
    	
    	/*刷新UI标记*/
    	public static final int Update_UI = 0;
    
    	/*计时器*/
    	private Timer mTimer = null;
    	private TimerTask mTimerTask = null;
    	
    	/*用来显示ADC返回值的控件*/
    	private TextView mTextView_ADC = null;
    
    	/*读取ADC的返回值*/
    	private int result = 0;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.adcdemo);
    
    		initUI();
    		initData();
    	}
    
    	/**
    	 * 
    	 * initUI: 初始化UI
    	 *
    	 * @param   
    	 * @return     
    	 * @throws 
    	 */
    	private void initUI() {
    		mTextView_ADC = (TextView)findViewById(R.id.TextView_adcresult);
    	}
    
    	/**
    	 * 
    	 * initData: 新建定时器，每隔500ms发出消息，通知Activity刷新UI一次。
    	 *
    	 * @param   
    	 * @return     
    	 * @throws 
    	 */
    	private void initData() {
    		mTimer = new Timer();
    		mTimerTask = new TimerTask() {
    			@Override
    			public void run() {
    				
    				/*调用底层库API读取ADC的值，正常情况下，返回ADC值，否则，出错，返回-1*/
    				result = HardwareControler.readADC();
    				
    				if(-1 == result){
    					Log.e(TAG,"Read ADC Error!");
    				}else{
    					Log.i(TAG,"readADC result: "+ result);
    					mHandler.sendMessage(mHandler.obtainMessage(Update_UI));
    				}
    			}
    		};
    		mTimer.schedule(mTimerTask, 0, 500);
    	}
    
    	private Handler mHandler  = new Handler(){
    		@Override
    		public void handleMessage(Message msg) {
    			int type = msg.what;
    			switch (type) {
    			case Update_UI:
    				mTextView_ADC.setText(String.valueOf(result));
    				break;
    			default:
    				break;
    			}
    		}
    
    	};
    
    	@Override
    	protected void onDestroy() {
    		if(mTimer != null){
    			mTimer.cancel();
    			mTimer = null;
    		}
    		super.onDestroy();
    	}
    
    
    }

adcdemo.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
    
        <TextView
            android:id="@+id/TextView_adctitle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/adcreslt"
            android:textSize="25sp" />
    
        <TextView
            android:id="@+id/TextView_adcresult"
            android:layout_width="fill_parent"
            android:layout_height="130dip"
            android:gravity="center"
            android:text="0"
            android:textColor="@drawable/mediumvioletred"
            android:textSize="80sp" />
    
    
    </LinearLayout>

预览效果:

![0_13318743496U8X.gif][]

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