我得到了这个代码(来自android web),一旦启动活动,就会存储一个文件位置来存储图像
{
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
/** Create a file Uri for saving an image or video */ private static
Uri getOutputMediaFileUri(int type){
return Uri.fromFile(getOutputMediaFile(type));
}
/** Create a File for saving an image or video */ private static
File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "MyCameraApp");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
然后我开始这样的活动:
cameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
});
然后当我得到结果时:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) { ... }
我看到调试它,“data”为空..
我做了同样的事情,但没有添加
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
当我添加没有额外的我收到数据信息..
猜我在写/读时有问题?但怎么样?我从android网页上复制!!
我有permision相机写作阅读外部存储!
帮助!!!!!!!!!!!!!!!
答案 0 :(得分:2)
当您为意图指定 MediaStore.EXTRA_OUTPUT 标记时,拍摄的照片将存储在您的手机存储中,并且不会返回任何数据。
来自Docs:
调用者可以传递额外的EXTRA_OUTPUT来控制该图像的写入位置。如果EXTRA_OUTPUT不存在,则在额外字段中返回小尺寸图像作为Bitmap对象。这对于只需要小图像的应用程序非常有用。如果存在EXTRA_OUTPUT,则将将全尺寸图像写入EXTRA_OUTPUT的Uri值。
当您使用该方法存储拍摄的照片时,您必须将URI与意图一起传递,以告知存储拍摄照片的位置
NightCrawler提供了有关如何获取数据的链接 onActivityResult
复制最重要的部分:
YourActivity extends Activity{
onCreate{
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);
}
onActivityResult(parameters..) {
if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
yourImageView.setImageBitmap(photo);
}
}
}