Android 调用系统相机，拍照并返回显示

1.添加系统权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.CAMERA" />

2.点击拍照，判断是否添加存储，拍照权限

private static final int CODE_CAMERA_REQUEST = 0xa1;private void shenqingPermission() {        if (ContextCompat.checkSelfPermission                (this,                        Manifest.permission.CAMERA)                != PackageManager.PERMISSION_GRANTED ||                ContextCompat.checkSelfPermission                        (this,                              Manifest.permission.WRITE_EXTERNAL_STORAGE)                        != PackageManager.PERMISSION_GRANTED) {            //申请相机权限            shenqing2();        } else {            //打开相册            Toast.makeText(this, "有权限，直接打开相机", Toast.LENGTH_SHORT).show();            //拍照            takePicture(this,  CODE_CAMERA_REQUEST,"ddd");        }    }public static final int daihao2 = 0x02;private void shenqing2() {//申请权限的方法        ActivityCompat.requestPermissions(this,                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,                        Manifest.permission.CAMERA}, daihao2);    }

申请权限的回调onRequestPermissionsResult

 @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        switch (requestCode) {            case daihao2:                if (grantResults.length > 0 && grantResults[1] == PackageManager.PERMISSION_GRANTED                        && grantResults[0] == PackageManager.PERMISSION_GRANTED                        ) {                    //拍照                    takePicture(this, CODE_CAMERA_REQUEST,null);                } else if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                    Toast.makeText(this, "您拒绝了拍照权限，所以不能拍照", Toast.LENGTH_SHORT).show();                } else if (grantResults.length > 0 && grantResults[1] == PackageManager.PERMISSION_GRANTED) {                    Toast.makeText(this, "您拒绝了存储权限，所以不能拍照", Toast.LENGTH_SHORT).show();                } else {                    Toast.makeText(this, "您拒绝了存储，拍照权限，所以不能拍照", Toast.LENGTH_SHORT).show();                }                break;        }    }

调用系统相机拍照拍照

     // 原图地址    private String imgPath;    // 临时保存文件名    String fileName = null;    /**     *     * 读取权限 授权之后 调用此方法     * @param activity    当前activity     * @param requestCode 调用系统相机请求码     */    public void takePicture(@NonNull Activity activity,@NonNull  int requestCode ,@Nullable String imgFileName) {        String baseUrl = Environment.getExternalStorageDirectory().getAbsolutePath()+"/my_img";        fileName = "";        if (TextUtils.isEmpty(imgFileName))            fileName = System.currentTimeMillis()+".jpg";        else            fileName = imgFileName+".jpg";        // 保存拍照的路径        Uri mImageCaptureUri;        // 跳转系统相机的intent        Intent takeIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);        // 根据不同的Android版本uri不一样        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) { //android7.0以上            ContentValues contentValues = new ContentValues(1);           String absolutePath = new File(baseUrl, fileName).getAbsolutePath();            contentValues.put(MediaStore.Images.Media.DATA, absolutePath);            mImageCaptureUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues);        } else {            File file = new File(baseUrl, fileName);            mImageCaptureUri = Uri.fromFile(file);        }        takeIntent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);        startActivityForResult(takeIntent, requestCode);    }

拍照的回调onActivityResult

@Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);//拍照成功 resultCode == RESULT_OK        if (resultCode == RESULT_OK && requestCode ==CODE_CAMERA_REQUEST) {            imgPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/my_img/"+fileName;            showImages(BitmapFactory.decodeFile(imgPath));        }    }//显示图片private void showImages(Bitmap bitmap) {        img.setImageBitmap(bitmap);    }

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