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   源码介绍

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获取返回键，enter键等监听，监听到，将此button变绿

绝对真实可运行，已调试

package com.example.keytest;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;

public class KeyTest extends Activity implements OnClickListener{
	private Button mBackButton;
	private Button mUpButton;
	private Button mDownButton;
	private Button mEnterButton;
	private Button mFailButton;
	private Button mSuccessButton;
	private Button mPowerButton;
	private Button mReTestButton;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		this.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
		this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
				WindowManager.LayoutParams.FLAG_FULLSCREEN);
		setContentView(R.layout.key_test);
		mBackButton = (Button) findViewById(R.id.back);
		mUpButton = (Button) findViewById(R.id.volume_up);
		mDownButton = (Button) findViewById(R.id.volume_down);
		mEnterButton = (Button) findViewById(R.id.enter);
		mPowerButton = (Button) findViewById(R.id.power);
		
		mFailButton = (Button) findViewById(R.id.failed);
		mFailButton.setOnClickListener(this);
		
		mSuccessButton = (Button) findViewById(R.id.successed);
		mSuccessButton.setOnClickListener(this);
		
		mReTestButton = (Button) findViewById(R.id.reTest);
		mReTestButton.setOnClickListener(this);
		
		mBackButton.setBackgroundColor(Color.WHITE);
		mUpButton.setBackgroundColor(Color.WHITE);
		mDownButton.setBackgroundColor(Color.WHITE);
		mEnterButton.setBackgroundColor(Color.WHITE);
		mPowerButton.setBackgroundColor(Color.WHITE);
	}

	@Override
	public boolean dispatchKeyEvent(KeyEvent event) {
		switch (event.getKeyCode()) {
		case KeyEvent.KEYCODE_BACK:
			mBackButton.setBackgroundColor(Color.GREEN);
			return true;

		case KeyEvent.KEYCODE_VOLUME_UP:
			mUpButton.setBackgroundColor(Color.GREEN);
			return true;
			
		case KeyEvent.KEYCODE_VOLUME_DOWN:
			mDownButton.setBackgroundColor(Color.GREEN);
			return true;
			
		case KeyEvent.KEYCODE_ENTER:
			mEnterButton.setBackgroundColor(Color.GREEN);
			return true;
			
		case KeyEvent.KEYCODE_POWER:
			mPowerButton.setBackgroundColor(Color.GREEN);
			return true;
		}
		return super.dispatchKeyEvent(event);
	}

	public void onClick(View v) {
		if(v == mSuccessButton){
//			this.setResult(1);
//			finish();
		}else if(v == mFailButton){
//			this.setResult(-1);
//			finish();
		}else if(v == mReTestButton){ 
			mUpButton.setBackgroundColor(Color.WHITE);
			mDownButton.setBackgroundColor(Color.WHITE);
			mBackButton.setBackgroundColor(Color.WHITE);
			mEnterButton.setBackgroundColor(Color.WHITE);
			mPowerButton.setBackgroundColor(Color.WHITE);
		}
	}

	@Override
	public void onAttachedToWindow()   
	{     
//	       this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);        
	       super.onAttachedToWindow();     
	}   
	
}