private Button btn_create,btn_scanner;
private ImageView imageView;
private EditText et;
private String time;
private File file = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_create = (Button) findViewById(R.id.btn_create);
btn_scanner = (Button) findViewById(R.id.btn_scanner);
imageView = (ImageView) findViewById(R.id.image);
et = (EditText) findViewById(R.id.editText);
btn_create.setOnClickListener(this);
btn_scanner.setOnClickListener(this);
imageView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
saveCurrentImage();
return true;
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_create:
String msg = et.getText().toString();
if(TextUtils.isEmpty(msg)){
Toast.makeText(MainActivity.this, "请输入信息", Toast.LENGTH_LONG).show();
return;
}
//生成二维码图片，第一个参数是二维码的内容，第二个参数是正方形图片的边长，单位是像素
Bitmap bitmap = null;
try {
bitmap = BitmapUtil.createQRCode(msg, 400);
} catch (WriterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageView.setImageBitmap(bitmap);
break;
case R.id.btn_scanner:
/* Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivity(intent);*/
break;
default:
break;
}
}
//这种方法状态栏是空白，显示不了状态栏的信息
private void saveCurrentImage()
{
//获取当前屏幕的大小
int width = getWindow().getDecorView().getRootView().getWidth();
int height = getWindow().getDecorView().getRootView().getHeight();
//生成相同大小的图片
Bitmap temBitmap = Bitmap.createBitmap( width, height, Bitmap.Config.ARGB_8888 );
//找到当前页面的根布局
View view = getWindow().getDecorView().getRootView();
//设置缓存
view.setDrawingCacheEnabled(true);
view.buildDrawingCache();
//从缓存中获取当前屏幕的图片,创建一个DrawingCache的拷贝，因为DrawingCache得到的位图在禁用后会被回收
temBitmap = view.getDrawingCache();
SimpleDateFormat df = new SimpleDateFormat("yyyymmddhhmmss");
time = df.format(new Date());
if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){
file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/screen",time + ".png");
if(!file.exists()){
file.getParentFile().mkdirs();
try {
file.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
temBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new Thread(new Runnable() {
@Override
public void run() {
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/screen/" + time + ".png";
final Result result = parseQRcodeBitmap(path);
file.delete();
runOnUiThread(new Runnable() {
public void run() {
// Toast.makeText(MainActivity.this, result.toString(), Toast.LENGTH_LONG).show();
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
Uri content_url = Uri.parse(result.toString());
intent.setData(content_url);
startActivity(intent);
}
});
}
}).start();
//禁用DrawingCahce否则会影响性能 ,而且不禁止会导致每次截图到保存的是第一次截图缓存的位图
view.setDrawingCacheEnabled(false);
}
}
//解析二维码图片,返回结果封装在Result对象中
private Result parseQRcodeBitmap(String bitmapPath){
//解析转换类型UTF-8
Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
//获取到待解析的图片
BitmapFactory.Options options = new BitmapFactory.Options();
//如果我们把inJustDecodeBounds设为true，那么BitmapFactory.decodeFile(String path, Options opt)
//并不会真的返回一个Bitmap给你，它仅仅会把它的宽，高取回来给你
options.inJustDecodeBounds = true;
//此时的bitmap是null，这段代码之后，options.outWidth 和 options.outHeight就是我们想要的宽和高了
Bitmap bitmap = BitmapFactory.decodeFile(bitmapPath,options);
//我们现在想取出来的图片的边长（二维码图片是正方形的）设置为400像素
//以上这种做法，虽然把bitmap限定到了我们要的大小，但是并没有节约内存，如果要节约内存，我们还需要使用inSimpleSize这个属性
options.inSampleSize = options.outHeight / 400;
if(options.inSampleSize <= 0){
options.inSampleSize = 1; //防止其值小于或等于0
}
/**
* 辅助节约内存设置
*
* options.inPreferredConfig = Bitmap.Config.ARGB_4444; // 默认是Bitmap.Config.ARGB_8888
* options.inPurgeable = true;
* options.inInputShareable = true;
*/
options.inJustDecodeBounds = false;
bitmap = BitmapFactory.decodeFile(bitmapPath, options);
//新建一个RGBLuminanceSource对象，将bitmap图片传给此对象
RGBLuminanceSource rgbLuminanceSource = new RGBLuminanceSource(bitmap);
//将图片转换成二进制图片
BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(rgbLuminanceSource));
//初始化解析对象
QRCodeReader reader = new QRCodeReader();
//开始解析
Result result = null;
try {
result = reader.decode(binaryBitmap, hints);
} catch (Exception e) {
// TODO: handle exception
}
return result;
} }
public class BitmapUtil {
/**
* 生成一个二维码图像
*
* @param url
* 传入的字符串，通常是一个URL
* @param QR_WIDTH
* 宽度（像素值px）
* @param QR_HEIGHT
* 高度（像素值px）
* @return
*/
public static final Bitmap create2DCoderBitmap(String url, int QR_WIDTH,
int QR_HEIGHT) {
try {
// 判断URL合法性
if (url == null || "".equals(url) || url.length() < 1) {
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(url,
BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
// 下面这里按照二维码的算法，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 < QR_HEIGHT; y++) {
for (int x = 0; x < QR_WIDTH; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * QR_WIDTH + x] = 0xff000000;
} else {
pixels[y * QR_WIDTH + x] = 0xffffffff;
}
}
}
// 生成二维码图片的格式，使用ARGB_8888
Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
// 显示到一个ImageView上面
// sweepIV.setImageBitmap(bitmap);
return bitmap;
} catch (WriterException e) {
Log.i("log", "生成二维码错误" + e.getMessage());
return null;
}
}
private static final int BLACK = 0xff000000;
/**
* 生成一个二维码图像
*
* @param url
* 传入的字符串，通常是一个URL
* @param widthAndHeight
* 图像的宽高
* @return
*/
public static Bitmap createQRCode(String str, int widthAndHeight)
throws WriterException {
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
try {
str = new String(str.getBytes("UTF-8"), "ISO-8859-1");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BitMatrix matrix = new MultiFormatWriter().encode(str,
BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
int width = matrix.getWidth();
int height = matrix.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (matrix.get(x, y)) {
pixels[y * width + x] = BLACK;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
} }
public class RGBLuminanceSource extends LuminanceSource {
private byte bitmapPixels[];
protected RGBLuminanceSource(Bitmap bitmap) {
super(bitmap.getWidth(), bitmap.getHeight());
// 首先，要取得该图片的像素数组内容
int[] data = new int[bitmap.getWidth() * bitmap.getHeight()];
this.bitmapPixels = new byte[bitmap.getWidth() * bitmap.getHeight()];
bitmap.getPixels(data, 0, getWidth(), 0, 0, getWidth(), getHeight());
// 将int数组转换为byte数组，也就是取像素值中蓝色值部分作为辨析内容
for (int i = 0; i < data.length; i++) {
this.bitmapPixels[i] = (byte) data[i];
}
}
@Override
public byte[] getMatrix() {
// 返回我们生成好的像素数据
return bitmapPixels;
}
@Override
public byte[] getRow(int y, byte[] row) {
// 这里要得到指定行的像素数据
System.arraycopy(bitmapPixels, y * getWidth(), row, 0, getWidth());
return row;
}
}