Android 手机应用的开发经验—QR生成器

核心提示：{super.onOptionsItemSelected(item);switch(item.getItemId()){case 0:openOptionsDialog();break;case 1:finish();break;}return true;}private void openOptionsDialog(

{

super.onOptionsItemSelected(item);

switch(item.getItemId())

{

case 0:

openOptionsDialog();

break;

case 1:

finish();

break;

}

return true;

}

private void openOptionsDialog()

{

new AlertDialog.Builder(this)

.setTitle(R.string.app_about)

.setMessage(R.string.app_about_msg)

.setPositiveButton(R.string.str_ok,

new DialogInterface.OnClickListener()

{

public void onClick(DialogInterface dialoginterface, int i)

{

}

}

)

.show();

}

3.4：自定义产生QRCode的函数

难者不会，会者不难。这句话说的真好，你不要看下面的代码就寥寥几行，在这几行代码的背后，我可是费了很大功夫的。代码如下：

Java代码

public Bitmap AndroidQREncode(String strEncoding, int qrcodeVersion) {

Log.i("wwj", "QREncode");

Bitmap canvasBmp = null;

try {

// 构建QRCode编码对象

com.swetake.util.Qrcode testQrcode = new com.swetake.util.Qrcode();

/* L','M','Q','H' */

testQrcode.setQrcodeErrorCorrect('M');//错误修正率

/* "N","A" or other */

testQrcode.setQrcodeEncodeMode('B');

/* 0-20 */

testQrcode.setQrcodeVersion(qrcodeVersion);

// getBytes

byte[] bytesEncoding = strEncoding.getBytes("utf-8");

if (bytesEncoding.length > 0) {

// 转化成boolean数组

bEncoding = testQrcode.calQrcode(bytesEncoding);

int w = 320;

int h = 240;

canvasBmp = Bitmap.createBitmap(w, h, Config.ARGB_8888);//创建一个可改变的Bitmat对象

Canvas cn = new Canvas(canvasBmp);//创建Canvas对象

onDraw(cn);//调用画图函数

cn.save(Canvas.ALL_SAVE_FLAG);