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Main.javapackage com.example.qrdecode;import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Calendar;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;public class Main extends Activity { private CameraView cv;
// 准备一个相机对象
private Camera mCamera = null;
// 准备一个Bitmap对象
private Bitmap mBitmap = null;
Decode decode = null;
// 准备一个保存图片的PictureCallback对象
public Camera.PictureCallback pictureCallback = new Camera.PictureCallback() { @Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.i("yao", "onPictureTaken");
Toast.makeText(getApplicationContext(), "正在保存……", Toast.LENGTH_LONG)
.show();
// 用BitmapFactory.decodeByteArray()方法可以把相机传回的裸数据转换成Bitmap对象
mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
// 接下来的工作就是把Bitmap保存成一个存储卡中的文件 new DateFormat();
File file = new File("/sdcard/YY"
+ DateFormat.format("yyyyMMdd_hhmmss",
Calendar.getInstance(Locale.CHINA)) + ".jpg");
try {
file.createNewFile();
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream(file));
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, os);
os.flush();
os.close();
Toast.makeText(getApplicationContext(), "图片保存完毕，在存储卡的根目录",
Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
}

decode = new Decode(mBitmap);
Result result = decode.getResult();
Toast.makeText(getApplicationContext(), result.getText(),
Toast.LENGTH_LONG).show(); } }; // Activity的创建方法
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); // 窗口去掉标题
requestWindowFeature(Window.FEATURE_NO_TITLE);
// 窗口设置为全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// 设置窗口为半透明
getWindow().setFormat(PixelFormat.TRANSLUCENT); // 提供一个帧布局
FrameLayout fl = new FrameLayout(this); // 创建一个照相预览用的SurfaceView子类，并放在帧布局的底层
cv = new CameraView(this);
fl.addView(cv); // 创建一个文本框添加在帧布局中，我们可以看到，文字自动出现在了SurfaceView的前面，由此你可以在预览窗口做出各种特殊效果
TextView tv = new TextView(this);
tv.setText("请按\"相机\"按钮拍摄");
fl.addView(tv);
Button bt = new Button(this);
bt.setAlpha(100);
bt.setOnClickListener(new i());
fl.addView(bt); // 设置Activity的根内容视图
setContentView(fl); } private class i implements OnClickListener { @Override
public void onClick(View v) {
// TODO 自动生成的方法存根
mCamera.cancelAutoFocus();
mCamera.takePicture(null, null, pictureCallback);
} } // 相机按键按下的事件处理方法
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
Log.i("yao", "MainActivity.onKeyDown");
if (keyCode == KeyEvent.KEYCODE_CAMERA) {
if (mCamera != null) {
Log.i("yao", "mCamera.takePicture");
// 当按下相机按钮时，执行相机对象的takePicture()方法,该方法有三个回调对象做入参，不需要的时候可以设null
mCamera.takePicture(null, null, pictureCallback);
}
}
return cv.onKeyDown(keyCode, event);
} // 照相视图
class CameraView extends SurfaceView { private SurfaceHolder holder = null; // 构造函数
public CameraView(Context context) {
super(context);
Log.i("yao", "CameraView"); // 操作surface的holder
holder = this.getHolder();
// 创建SurfaceHolder.Callback对象
holder.addCallback(new SurfaceHolder.Callback() { @Override
public void surfaceDestroyed(SurfaceHolder holder) {
// 停止预览
mCamera.stopPreview();
// 释放相机资源并置空
mCamera.release();
mCamera = null;
} @Override
public void surfaceCreated(SurfaceHolder holder) {
// 当预览视图创建的时候开启相机
mCamera = Camera.open();
try {
// 设置预览
mCamera.setPreviewDisplay(holder);
} catch (IOException e) {
// 释放相机资源并置空
mCamera.release();
mCamera = null;
} } // 当surface视图数据发生变化时，处理预览信息
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) { // 获得相机参数对象
Camera.Parameters parameters = mCamera.getParameters();
// 设置格式
parameters.setPictureFormat(PixelFormat.JPEG);
// 设置预览大小，这里我的测试机是Milsstone所以设置的是854x480
List<Camera.Size> pictureSizes = parameters
.getSupportedPreviewSizes();
Camera.Size size1 = pictureSizes.get(3);
parameters.setPreviewSize(size1.width, size1.height);
// 设置自动对焦
parameters
.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
// 设置图片保存时的分辨率大小
pictureSizes = parameters.getSupportedPictureSizes();
Camera.Size size2 = pictureSizes.get(11);
parameters.setPictureSize(size2.width, size2.height);
// 给相机对象设置刚才设定的参数 mCamera.setParameters(parameters);
// 开始预览
mCamera.setDisplayOrientation(90);
mCamera.startPreview();
mCamera.cancelAutoFocus();
}
});
// 设置Push缓冲类型，说明surface数据由其他来源提供，而不是用自己的Canvas来绘图，在这里是由摄像头来提供数据
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
} }}
RGBLuminanceSource.javapackage com.example.qrdecode;import android.graphics.Bitmap;import com.google.zxing.LuminanceSource;public class RGBLuminanceSource extends LuminanceSource {
private final byte[] luminances;
public RGBLuminanceSource(Bitmap bitmap) {
super(bitmap.getWidth(), bitmap.getHeight());
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int[] pixels = new int[width * height];
bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
// In order to measure pure decoding speed, we convert the entire image
// to a greyscale array
// up front, which is the same as the Y channel of the
// YUVLuminanceSource in the real app.
luminances = new byte[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
int pixel = pixels[offset + x];
int r = (pixel >> 16) & 0xff;
int g = (pixel >> 8) & 0xff;
int b = pixel & 0xff;
if (r == g && g == b) {
// Image is already greyscale, so pick any channel.
luminances[offset + x] = (byte) r;
} else {
// Calculate luminance cheaply, favoring green.
luminances[offset + x] = (byte) ((r + g + g + b) >> 2);
}
}
}
} @Override
public byte[] getRow(int y, byte[] row) {
if (y < 0 || y >= getHeight()) {
throw new IllegalArgumentException(
"Requested row is outside the image: " + y);
}
int width = getWidth();
if (row == null || row.length < width) {
row = new byte[width];
}
System.arraycopy(luminances, y * width, row, 0, width);
return row;
} // Since this class does not support cropping, the underlying byte array
// already contains
// exactly what the caller is asking for, so give it to them without a copy.
@Override
public byte[] getMatrix() {
return luminances;
}
}
Decode.javapackage com.example.qrdecode;import java.util.HashMap;
import java.util.Map;import android.graphics.Bitmap;import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;public class Decode {
RGBLuminanceSource luminanceSource = null;
private BinaryBitmap binaryBitmap = null;
private QRCodeReader reader = null;
private Result result = null;
private Map<DecodeHintType, String> map = null;
public Decode(Bitmap mBitmap)
{
luminanceSource = new RGBLuminanceSource(mBitmap);
binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));
reader = new QRCodeReader();
map = new HashMap<DecodeHintType, String>();
map.put(DecodeHintType.CHARACTER_SET, "utf-8");
}
public Result getResult()
{

try {
result = reader.decode(binaryBitmap, map);
} catch (NotFoundException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (ChecksumException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (FormatException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
return result;
}
}

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