android 6.0以上版本拍照功能实现

android 6.0及以上版本实现拍照功能的方法

步骤一：创建一个给予权限的Utils，Demo1如下：

private static String[] PERMISSIONS_CAMERA_AND_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.CAMERA};
public static boolean isCameraPermission(Activity context, int requestCode){
if (Build.VERSION.SDK_INT >= 23) {
int storagePermission = ActivityCompat.checkSelfPermission(context,
Manifest.permission.WRITE_EXTERNAL_STORAGE);
int cameraPermission = ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA);
if (storagePermission != PackageManager.PERMISSION_GRANTED || cameraPermission!= PackageManager.PERMISSION_GRANTED ) {
ActivityCompat.requestPermissions(context, PERMISSIONS_CAMERA_AND_STORAGE,
requestCode);
return false;
}
}
return true;
}

/**
* 获取bitmap
*
* @param filePath
* @return
*/
public static Bitmap getBitmapByPath(String filePath, int w, int h) {
FileInputStream fis = null;
Bitmap bitmap = null;
try {
File file = new File(filePath);
if (file.exists()) {
fis = new FileInputStream(file);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
int originalWidth = options.outWidth;//图片原始宽度
int originalHeight = options.outHeight;//图片原始高度
if ((originalWidth == -1) || (originalHeight == -1))
return null;
//缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可
int be = 1;//be=1表示不缩放
if (originalWidth > originalHeight && originalWidth > w) {//如果宽度大的话根据宽度固定大小缩放
be = (int) (originalWidth / w);
} else if (originalWidth < originalHeight && originalHeight > h) {//如果高度高的话根据宽度固定大小缩放
be = (int) (originalHeight / h);
}
if (be <= 0)
be = 1;
options.inJustDecodeBounds = false;
options.inSampleSize = be;//设置缩放比例
options.inPreferredConfig = Bitmap.Config.RGB_565;
bitmap = BitmapFactory.decodeFile(filePath, options);
}
} catch (IOException e) {
e.printStackTrace();
} catch (OutOfMemoryError e) {
e.printStackTrace();
} finally {
try {
fis.close();
} catch (Exception e) {
}
}
//return getBitmapByPath(filePath, bitmapOptions);
return compressImage(bitmap);
}
/**
* 质量压缩方法
*
* @param image
* @return
*/
public static Bitmap compressImage(Bitmap image) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中
int options = 90;
int bytes = baos.toByteArray().length;
while ((bytes / 1024 > 100) && (options >= 20)) {  //循环判断如果压缩后图片是否大于10kb,大于继续压缩
baos.reset();//重置baos即清空baos
options -= 10;//每次都减少10
//第一个参数 ：图片格式 ，第二个参数： 图片质量，100为最高，0为最差  ，第三个参数：保存压缩后的数据的流
image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
bytes = baos.toByteArray().length;
}
image.recycle();
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
return bitmap;
}

步骤二：点击拍照方法中调区这个权限Demo1，形如；

if (Demo1.isCameraPermission(ReceiptConfirmActivity.this, 0x007))
getCamera();

步骤三：请求权限回调

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode) {
case 0x007:
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
byCamera();
} else {
Toast.makeText(this, "拍照权限被拒绝", Toast.LENGTH_SHORT).show();
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}

步骤四：实现拍照方法

public void getCamera() {
String savePath = "";
String storageState = Environment.getExternalStorageState();
if (storageState.equals(Environment.MEDIA_MOUNTED)) {
savePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/camera/";
File savedir = new File(savePath);
if (!savedir.exists()) {
savedir.mkdirs();
}
}
// 没有挂载SD卡，无法保存文件
if (savePath == null || "".equals(savePath)) {
System.out.println("无法保存照片，请检查SD卡是否挂载");
return;
}
String timeStamp = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
//照片命名
String fileName = timeStamp + ".jpg";
File out = new File(savePath, fileName);
Uri uri = Uri.fromFile(out);
//该照片的绝对路径
imagePath = savePath + fileName;
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent, 0x008);
}

步骤五：显示照片

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 8) {
if(imagePath!=null && resultCode == RESULT_OK){

ivGetGoodsPhoto.setImageBitmap(PermissionUtils.getBitmapByPath(imagePath,480,800));
}
}
}