Zxing扫描和生成二维码+butterknife8.0之后的引用+将drawable文件夹下的图片转换成Drawable

Zxing扫描和生成二维码+butterknife8.0之后的引用

**最近项目中用到二维码扫描和生成使用到了Zxing这里记录下来：

先贴官方地址：**官网地址 开源中国 github.

项目下载地址：http://download.csdn.net/detail/u010023795/9679251

我这里只集成了扫码和二维码生成的功能这里主要用到的两个类：CaptureActivity 扫描和EncodingUtils生成：“

* /*

public final class CaptureActivity extends Activity implements SurfaceHolder.Callback {

private static final String TAG = CaptureActivity.class.getSimpleName();

private CameraManager cameraManager;

private CaptureActivityHandler handler;

private InactivityTimer inactivityTimer;

private BeepManager beepManager;

private SurfaceView scanPreview = null;

private RelativeLayout scanContainer;

private RelativeLayout scanCropView;

private ImageView scanLine;

private Rect mCropRect = null;

private boolean isHasSurface = false;

public Handler getHandler() {

return handler;

}

public CameraManager getCameraManager() {

return cameraManager;

}

@Override

public void onCreate(Bundle icicle) {

super.onCreate(icicle);

Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_capture);

scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
scanContainer = (RelativeLayout) findViewById(R.id.capture_container);
scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);
scanLine = (ImageView) findViewById(R.id.capture_scan_line);

inactivityTimer = new InactivityTimer(this);
beepManager = new BeepManager(this);

TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation
.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,
0.9f);
animation.setDuration(4500);
animation.setRepeatCount(-1);
animation.setRepeatMode(Animation.RESTART);
scanLine.startAnimation(animation);

}

@Override

protected void onResume() {

super.onResume();

// CameraManager must be initialized here, not in onCreate(). This is
// necessary because we don't
// want to open the camera driver and measure the screen size if we're
// going to show the help on
// first launch. That led to bugs where the scanning rectangle was the
// wrong size and partially
// off screen.
cameraManager = new CameraManager(getApplication());

handler = null;

if (isHasSurface) {
// The activity was paused but not stopped, so the surface still
// exists. Therefore
// surfaceCreated() won't be called, so init the camera here.
initCamera(scanPreview.getHolder());
} else {
// Install the callback and wait for surfaceCreated() to init the
// camera.
scanPreview.getHolder().addCallback(this);
}

inactivityTimer.onResume();

}

@Override

protected void onPause() {

if (handler != null) {

handler.quitSynchronously();

handler = null;

}

inactivityTimer.onPause();

beepManager.close();

cameraManager.closeDriver();

if (!isHasSurface) {

scanPreview.getHolder().removeCallback(this);

}

super.onPause();

}

@Override

protected void onDestroy() {

inactivityTimer.shutdown();

super.onDestroy();

}

@Override

public void surfaceCreated(SurfaceHolder holder) {

if (holder == null) {

Log.e(TAG, “* WARNING * surfaceCreated() gave us a null surface!”);

}

if (!isHasSurface) {

isHasSurface = true;

initCamera(holder);

}

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

isHasSurface = false;

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

/**

A valid barcode has been found, so give an indication of success and show

the results.

*

@param rawResult The contents of the barcode.

@param bundle The extras

*/

public void handleDecode(Result rawResult, Bundle bundle) {

inactivityTimer.onActivity();

beepManager.playBeepSoundAndVibrate();

/*

这里是扫描成功之后返回数据给界面，需要返回的数据在这里添加

*/

Intent resultIntent = new Intent();

bundle.putInt(“width”, mCropRect.width()); //返回生成二维码扫描框的宽

bundle.putInt(“height”, mCropRect.height());//返回生成二维码扫描框的高

bundle.putString(“result”, rawResult.getText());//返回二维码的内容

resultIntent.putExtras(bundle);

this.setResult(RESULT_OK, resultIntent);

CaptureActivity.this.finish();

}

private void initCamera(SurfaceHolder surfaceHolder) {

if (surfaceHolder == null) {

throw new IllegalStateException(“No SurfaceHolder provided”);

}

if (cameraManager.isOpen()) {

Log.w(TAG, “initCamera() while already open – late SurfaceView callback?”);

return;

}

try {

cameraManager.openDriver(surfaceHolder);

// Creating the handler starts the preview, which can also throw a

// RuntimeException.

if (handler == null) {

handler = new CaptureActivityHandler(this, cameraManager, DecodeThread.ALL_MODE);

}

initCrop();
} catch (IOException ioe) {
Log.w(TAG, ioe);
displayFrameworkBugMessageAndExit();
} catch (RuntimeException e) {
// Barcode Scanner has seen crashes in the wild of this variety:
// java.?lang.?RuntimeException: Fail to connect to camera service
Log.w(TAG, "Unexpected error initializing camera", e);
displayFrameworkBugMessageAndExit();
}

}

private void displayFrameworkBugMessageAndExit() {

// camera error

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle(getString(R.string.app_name));

builder.setMessage(“Camera error”);

builder.setPositiveButton(“OK”, new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}

});
builder.setOnCancelListener(new DialogInterface.OnCancelListener() {

@Override
public void onCancel(DialogInterface dialog) {
finish();
}
});
builder.show();

}

public void restartPreviewAfterDelay(long delayMS) {

if (handler != null) {

handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);

}

}

public Rect getCropRect() {

return mCropRect;

}

/**

初始化截取的矩形区域

*/

private void initCrop() {

int cameraWidth = cameraManager.getCameraResolution().y;

int cameraHeight = cameraManager.getCameraResolution().x;

/* 获取布局中扫描框的位置信息 /

int[] location = new int[2];

scanCropView.getLocationInWindow(location);

int cropLeft = location[0];

int cropTop = location[1] - getStatusBarHeight();

int cropWidth = scanCropView.getWidth();

int cropHeight = scanCropView.getHeight();

/* 获取布局容器的宽高 /

int containerWidth = scanContainer.getWidth();

int containerHeight = scanContainer.getHeight();

/* 计算最终截取的矩形的左上角顶点x坐标 /

int x = cropLeft * cameraWidth / containerWidth;

/* 计算最终截取的矩形的左上角顶点y坐标 /

int y = cropTop * cameraHeight / containerHeight;

/* 计算最终截取的矩形的宽度 /

int width = cropWidth * cameraWidth / containerWidth;

/* 计算最终截取的矩形的高度 /

int height = cropHeight * cameraHeight / containerHeight;

/* 生成最终的截取的矩形 /

mCropRect = new Rect(x, y, width + x, height + y);

}

private int getStatusBarHeight() {

try {

Class <> c = Class.forName(“com.android.internal.R$dimen”);//class<>里面为？

Object obj = c.newInstance();

Field field = c.getField(“status_bar_height”);

int x = Integer.parseInt(field.get(obj).toString());

return getResources().getDimensionPixelSize(x);

} catch (Exception e) {

e.printStackTrace();

}

return 0;

}

}

下面是二维码生成工具类：

/**

二维码生成工具类

*/

public class EncodingUtils {

/**

创建二维码

*

@param content content

@param widthPix widthPix

@param heightPix heightPix

@param logoBm logoBm

@return 二维码

*/

public static Bitmap createQRCode(String content, int widthPix, int heightPix, Bitmap logoBm) {

try {

if (content == null || “”.equals(content)) {

return null;

}

// 配置参数

Map<> hints = new HashMap<>();//Map<>括号里应该是EncodeHintType, Object不知道为什么csdn里面这样直接这样写会造成下面的内容全部不显示

hints.put(EncodeHintType.CHARACTER_SET, “utf-8”);

// 容错级别

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

// 图像数据转换，使用了矩阵转换

BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix,

heightPix, hints);

int[] pixels = new int[widthPix * heightPix];

// 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 < heightPix; y++) {

for (int x = 0; x < widthPix; x++) {

if (bitMatrix.get(x, y)) {

pixels[y * widthPix + x] = 0xff000000;

} else {

pixels[y * widthPix + x] = 0xffffffff;

}

}

}

// 生成二维码图片的格式，使用ARGB_8888

Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);

bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);

if (logoBm != null) {

bitmap = addLogo(bitmap, logoBm);

}

//必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！

return bitmap;

} catch (WriterException e) {

e.printStackTrace();

}

return null;

}

/**

在二维码中间添加Logo图案

*/

private static Bitmap addLogo(Bitmap src, Bitmap logo) {

if (src == null) {

return null;

}

if (logo == null) {

return src;

}

//获取图片的宽高

int srcWidth = src.getWidth();

int srcHeight = src.getHeight();

int logoWidth = logo.getWidth();

int logoHeight = logo.getHeight();

if (srcWidth == 0 || srcHeight == 0) {

return null;

}

if (logoWidth == 0 || logoHeight == 0) {

return src;

}

//logo大小为二维码整体大小的1/5

float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;

Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);

try {

Canvas canvas = new Canvas(bitmap);

canvas.drawBitmap(src, 0, 0, null);

canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);

canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);

canvas.save(Canvas.ALL_SAVE_FLAG);

canvas.restore();

} catch (Exception e) {

bitmap = null;

e.getStackTrace();

}

return bitmap;

}

}

这些类都是Zxing里面的，自己可以根据需要去封装。

封装好了类之后其实我们的调用就很简单了只需要写一个Activity。

public class MainActivity extends AppCompatActivity {

@BindView(R.id.btn_camer)
Button btnCamer;
@BindView(R.id.tv_result)
TextView tvResult;
@BindView(R.id.et_qr_string)
EditText etQrString;
@BindView(R.id.btn_creat)
Button btnCreat;
@BindView(R.id.if_logo)
CheckBox ifLogo;
@BindView(R.id.iamge_show)
ImageView iamgeShow;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);

}

@OnClick({R.id.btn_camer, R.id.btn_creat, R.id.if_logo, R.id.iamge_show})
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_camer:
startActivityForResult(new Intent(MainActivity.this, CaptureActivity.class),0);//启动扫描界面
break;
case R.id.btn_creat:
String str = etQrString.getText().toString();
if (str.equals("")) {
Toast.makeText(MainActivity.this, "不能为空", Toast.LENGTH_SHORT).show();
} else {
// 位图
try {
/**
* 参数：1.文本 2 3.二维码的宽高 4.二维码中间的那个logo
*/
Bitmap bitma = BitmapFactory.decodeResource(getResources(), R.drawable.zaizai);
Bitmap bitmap = EncodingUtils.createQRCode(str, 700, 700,bitma);
// 设置图片
iamgeShow.setImageBitmap(bitmap);
Toast.makeText(this,"55555"+str,Toast.LENGTH_SHORT).show();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Toast.makeText(this,"55555",Toast.LENGTH_SHORT).show();
break;
case R.id.if_logo:
break;
case R.id.iamge_show:
break;
}
}
/*
扫描成功之后返回二维码的信息在这里接收处理
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
String result = data.getExtras().getString("result");
Toast.makeText(this,result+"1",Toast.LENGTH_SHORT).show();
tvResult.setText(result);
}
}

}

二维码生成和扫描就这么写完了，但是在运行的时候竟然报控件空指针错误，就是说我的控件都是没有生成找不到的在运行的时候，但是我明明用了ButterKnife也添加进去了还可以自动生成，但是注解运行的时候就是没成功。后来找到了资料，原来在ButterKnife8.0以后引用发生了改变。现在必需多做几道程序下面请看图：

先把官网地址贴出来：http://jakewharton.github.io/butterknife/

github：https://github.com/JakeWharton/butterknife



接下来我们打开第一个gradle

添加classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.8’



第二步打开第二个gradle

apply plugin: ‘com.neenbedankt.android-apt’

compile ‘com.jakewharton:butterknife:8.4.0’

apt ‘com.jakewharton:butterknife-compiler:8.4.0’



最后注意添加的版本是不是一致，两个gradle中Butter Knife版本必须一致。最后重新 clean project就完成了。

参考：http://www.cnblogs.com/zzw1994/p/5197758.html

将drawable下的图片转换成bitmap

1、 Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.xxx);

2、Resources r = this.getContext().getResources();

Inputstream is = r.openRawResource(R.drawable.xxx);

BitmapDrawable bmpDraw = new BitmapDrawable(is);

Bitmap bmp = bmpDraw.getBitmap();

3、Resources r = this.getContext().getResources();

Bitmap bmp=BitmapFactory.decodeResource(r, R.drawable.icon);

Bitmap bmp = Bitmap.createBitmap( 300, 300, Config.ARGB_8888 );

将drawable下的图片转换成Drawable

Resources resources = mContext.getResources();

Drawable drawable = resources.getDrawable(R.drawable.a);

imageview.setBackground(drawable);