转载请注明出处：王亟亟的大牛之路
现在二维码已经渗透了我们的生活，各种扫码关注啊，扫码下载的，今天上一个根据输入内容生成二维码的功能。
包结构： 
界面截图：
功能：输入网址–>生成图片–>显示到Imageview–>储存到本地SD卡中
MainActivity(重要的部分已详细标注，生成的图片也经过测试可用)
public class MainActivity extends Activity {
ImageView imageview;
EditText webInput;
Button MakeImage;
Bitmap qrImage;
private ProgressDialog mLoadingDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webInput=(EditText)findViewById(R.id.webInput);
imageview=(ImageView)findViewById(R.id.imageview);
MakeImage=(Button)findViewById(R.id.MakeImage);
//业务逻辑
doBusiness();
}
public void doBusiness(){
MakeImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//判断是否有输入内容
if(webInput.getText().toString().equals("")||webInput==null){
Toast.makeText(MainActivity.this, "请输入网址", Toast.LENGTH_SHORT).show();
return;
}else{
showLoadingDialog("Loading...");
//回收bitmap
if(null != qrImage && !qrImage.isRecycled()){
qrImage.recycle();
qrImage = null;
}
try {
qrImage = makeQRImage(webInput.getText().toString(), 600, 600);
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageview.setImageBitmap(qrImage);
//生成图片
if(isMountedSDCard()){
String filePath =Environment.getExternalStorageDirectory()+ "/MyLive/QRImage/"+"aa"+".jpg";
try {
//保存图片
saveAsJPEG(qrImage, filePath);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
dismissLoadingDialog();
Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(MainActivity.this, "没有安装SD卡", Toast.LENGTH_LONG).show();
}
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/*显示对话框*/
public void showLoadingDialog(String msg) {
if (mLoadingDialog != null && mLoadingDialog.isShowing()) {
return;
}
mLoadingDialog = new ProgressDialog(this);
mLoadingDialog.setMessage(msg);
// mLoadingDialog.setOnKeyListener(mOnKeyListener);
// mLoadingDialog.setCancelable(false);
mLoadingDialog.show();
}
/**
* 取消加载对话框
*/
public void dismissLoadingDialog() {
if (mLoadingDialog != null) {
mLoadingDialog.dismiss();
}
}
/**
* 根据指定内容生成自定义宽高的二维码图片
* @param content 需要生成二维码的内容
* @param width 二维码宽度
* @param height 二维码高度
* @throws WriterException 生成二维码异常
*/
public static Bitmap makeQRImage(String content, int width, int height)
throws WriterException {
// 判断URL合法性
if (!isNoBlankAndNoNull(content))
return null;
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
// 图像数据转换，使用了矩阵转换
BitMatrix bitMatrix = new QRCodeWriter().encode(content,
BarcodeFormat.QR_CODE, width, height, hints);
int[] pixels = new int[width * height];
// 按照二维码的算法，逐个生成二维码的图片，两个for循环是图片横列扫描的结果
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (bitMatrix.get(x, y))
pixels[y * width + x] = 0xff000000;
else
pixels[y * width + x] = 0xffffffff;
}
}
// 生成二维码图片的格式，使用ARGB_8888
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
/**
* 判断字符串是否非空非null
* @param strParm 需要判断的字符串
* @return 真假
*/
public static boolean isNoBlankAndNoNull(String strParm)
{
return ! ( (strParm == null) || (strParm.equals("")));
}
/**
* 指定目录写入文件内容
* @param filePath 文件路径+文件名
* @param content 文件内容
* @throws IOException
*/
public static void saveAsJPEG(Bitmap bitmap,String filePath)
throws IOException {
FileOutputStream fos = null;
try {
File file = new File(filePath);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
fos = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100,fos);
fos.flush();
} finally {
if (fos != null) {
fos.close();
}
}
}
public static boolean isMountedSDCard() {
if (Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState())) {
return true;
} else {
return false;
}
}
}布局文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.qrcodedemo.MainActivity" >
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/webInput"
android:layout_alignParentLeft="true"
android:layout_alignTop="@+id/webInput"
android:text="输入网址:"
android:textSize="16sp"
android:gravity="bottom"/>
<EditText
android:id="@+id/webInput"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/textView1"
android:ems="10" >
<requestFocus />
</EditText>
</LinearLayout>
<Button
android:id="@+id/MakeImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MakeImage" />
<ImageView
android:id="@+id/imageview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</ScrollView>
</RelativeLayout>源码地址：http://yunpan.cn/cd8sknyybpZzE 访问密码 8f62
因为在代码中已经注明，所以下源码看了用即可，不做过多解释用到的JAR包也在源码内
