1、GPS功能代码

private void getLocation()
	{
		LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
				 200, 0, locationListener);

	}
	private final LocationListener locationListener = new LocationListener() {
	    public void onLocationChanged(Location location) { //当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发
	        // log it when the location changes
	        if (location != null) {
	        	Lat.setText(String.valueOf(location.getLatitude()));
	        	Lon.setText(String.valueOf(location.getLongitude()));

	        }
	    }

	    public void onProviderDisabled(String provider) {
	    // Provider被disable时触发此函数，比如GPS被关闭
	    }

	    public void onProviderEnabled(String provider) {
	    //  Provider被enable时触发此函数，比如GPS被打开
	    }

	    public void onStatusChanged(String provider, int status, Bundle extras) {
	    // Provider的转态在可用、暂时不可用和无服务三个状态直接切换时触发此函数
	    }
	};

2、拍照功能代码

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
     // Hide the window title.
		requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.main);
        imageView = (ImageView) this.findViewById(R.id.iv1);
		Button button = (Button) this.findViewById(R.id.bt1);
		button.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
				intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri
						.fromFile(new File(Environment
								.getExternalStorageDirectory(), "temp.jpg")));
				intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
				startActivityForResult(intent, 0);
			}
		});

    }
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == 0 && resultCode == Activity.RESULT_OK) {
			this.imageView.setImageDrawable(Drawable.createFromPath(new File(
					Environment.getExternalStorageDirectory(), "temp.jpg")
					.getAbsolutePath()));

		}
	}

3、退出程序确认

public boolean onKeyDown(int keyCode, KeyEvent event) {

		//按下键盘上返回按钮
		if(keyCode == KeyEvent.KEYCODE_BACK){
			new AlertDialog.Builder(Main.this)
			// Main.this视情况而定，这个一般是指当前显示的Activity对应的XML视窗。
			.setTitle("")// 设置对话框的标题
			.setMessage(" 确定退出? ")// 设置对话框的内容
			.setPositiveButton("确定",// 设置对话框的确认按钮
			    new DialogInterface.OnClickListener() {// 设置确认按钮的事件
			        public void onClick(DialogInterface dialog, int which) {
			            //退出程序
			            android.os.Process.killProcess(android.os.Process.myPid());
			    }})
			.setNegativeButton("取消",// 设置对话框的取消按钮
			    new DialogInterface.OnClickListener() {// 设置取消按钮的事件
			        public void onClick(DialogInterface dialog, int which) {
			            // 如果你什么操作都不做，可以选择不写入任何代码
			            dialog.cancel();
			    }}
			).show();

			return true;
		}else{		
			return super.onKeyDown(keyCode, event);
		}
	}