Android调用系统相机和图片获取照片并裁剪

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前言：当下许多程序都有图片上传、发送等功能，这就需要调用摄像头拍照或者获取系统图库的照片，此功能较为常用，在结合网上一些教程及实践，总结出的一份代码，在此记录一下。

首先定义一些程序需要用到的常量

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private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 1;  //调用照相机
private static final int PHOTO_ALBUM_REQUEST_CODE = 2;  //调用图库
private static final int CROP_PICTURE = 3; //裁剪
private static final int PICTURE_WIDTH = 200;  //图片输出大小
private static final int PICTURE_HEIGHT = 200;  //图片输出大小
private Uri imageUri;  //图片地址

使用Intent调用系统图库，Action为Intent.ACTION_GET_CONTENT

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/**
 * 调用系统图库
*/
private void photoAlbum() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
    File outputImage = new File(Environment.getExternalStorageDirectory(), "portrait.png");
    try {
        if (outputImage.exists()) {
            outputImage.delete();
        }
        outputImage.createNewFile();
    } catch (Exception e) {
        e.printStackTrace();
    }
    imageUri = Uri.fromFile(outputImage);
    intent.setType("image/*");
    intent.putExtra("crop", "true");
    //裁剪框比例
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    //图片输出大小
    intent.putExtra("outputX", PICTURE_WIDTH);
    intent.putExtra("outputY", PICTURE_HEIGHT);
    intent.putExtra("scale", true);
    intent.putExtra("return-data", false);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
    //不启用人脸识别
    intent.putExtra("noFaceDetection", false);
    startActivityForResult(intent, PHOTO_ALBUM_REQUEST_CODE);
}

使用Intent调用系统相机，Action为android.media.action.IMAGE_CAPTURE

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/**
 * 调用系统照相机
*/
private void captureImage() {
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
    File outputImage = new File(Environment.getExternalStorageDirectory(), "portrait.png");
    try {
      if (outputImage.exists()) {
          outputImage.delete();
      }
      outputImage.createNewFile();
    } catch (Exception e) {
        e.printStackTrace();
    }
    imageUri = Uri.fromFile(outputImage);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(intent,CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}

使用Intent调用系统裁剪，Action为com.android.camera.action.CROP

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/**
 * 裁剪
*/
private void cropPicture() {
    Intent intent = new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(imageUri, "image/*");
    intent.putExtra("crop", "true");//可裁剪
    intent.putExtra("aspectX", 1);
    intent.putExtra("aspectY", 1);
    intent.putExtra("outputX", PICTURE_WIDTH);
    intent.putExtra("outputY", PICTURE_HEIGHT);
    intent.putExtra("scale", true);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    intent.putExtra("return-data", true);//若为false则表示不返回数据
    intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
    intent.putExtra("noFaceDetection", true);
    startActivityForResult(intent, CROP_PICTURE);
}

系统调用相册、相机、裁剪操作后回调，在onActivityResult里根据requestCode进行处理

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/**
 * 拍照和系统图库选择图片返回事件处理
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE:  //拍照结果回调,进行裁剪
            cropPicture();
            break;
        case PHOTO_ALBUM_REQUEST_CODE:  //系统图库回调
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(getApplicationContext().getContentResolver().openInputStream(imageUri));
                if (bitmap == null) return;
                Log.d(TAG, "photo album" + bitmap.getRowBytes() * bitmap.getHeight());
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            break;
        case CROP_PICTURE:  //拍照后裁剪回调
            try {
                Bitmap bitmap = BitmapFactory.decodeStream(getApplicationContext().getContentResolver().openInputStream(imageUri));
                if (bitmap == null) return;
                Log.d(TAG, "take photo" + bitmap.getRowBytes() * bitmap.getHeight());
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            break;
    }
}