将照片保存到文件时出现问题 [英] Problems saving a photo to a file

问题描述

伙计，当我发送一个要求拍照的意图时，我仍然无法保存图片.这就是我正在做的事情:

Man, I am still not able to save a picture when I send an intent asking for a photo to be taken. Here's what I am doing:

1. 创建一个表示路径名的 URI

1. Make a URI representing the pathname

android.content.Context c = getApplicationContext(); 

String fname = c.getFilesDir().getAbsolutePath()+"/parked.jpg";

java.io.File file = new java.io.File( fname ); 

Uri fileUri = Uri.fromFile(file);

创建 Intent(不要忘记 pkg 名称！)并开始活动

Create the Intent (don't forget the pkg name!) and start the activity

private static int TAKE_PICTURE = 22;

Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );

intent.putExtra("com.droidstogo.boom1." + MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult( intent, TAKE_PICTURE );

相机活动开始，我可以拍照并批准它.我的 onActivityResult() 然后被调用.但是我的文件没有被写入.URI 为:file:///data/data/com.droidstogo.boom1/files/parked.jpg

The camera activity starts, and I can take a picture, and approve it. My onActivityResult() then gets called. But my file doesn't get written. The URI is: file:///data/data/com.droidstogo.boom1/files/parked.jpg

我可以创建缩略图 OK(通过不将额外内容放入 Intent)，并且可以写入该文件 OK，然后再将其读回.

I can create thumbnail OK (by not putting the extra into the Intent), and can write that file OK, and later read it back).

谁能看出我犯了什么简单的错误?logcat 中没有任何明显的显示 - 相机显然正在拍照.谢谢，

Can anyone see what simple mistake I am making? Nothing obvious shows up in the logcat - the camera is clearly taking the picture. Thanks,

彼得

我应该提到我在 AndroidManifest.xml 文件中设置了适当的权限:

I should mention that I have the appropriate permissions set in the AndroidManifest.xml file:

    <uses-permission android:name="android.permission.READ_OWNER_DATA" />
    <uses-permission android:name="android.permission.WRITE_OWNER_DATA" />

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

    <uses-feature android:name="android.hardware.camera" />
    <uses-library android:name="com.google.android.maps" />



</application>

有什么想法吗?有什么想法可以尝试，以获取有关该问题的更多信息?

Any ideas? Any ideas on things to try, to get more info about the problem?

推荐答案

1. 正如 Steve H 所说，你不能只使用 file:///data/data/com.droidstogo.boom1/files/parked.jpg 来做这件事.这是您的应用程序私有目录，相机不能在那里写入.例如，您可以使用一些 SD 卡文件 - 它可供所有人使用.

1. As Steve H said you can't just use file:///data/data/com.droidstogo.boom1/files/parked.jpg for that. It's your application private directory and camera can't write there. You can use some SD card file for example - it's available for all.

正如stealthcopter 所说，intent extra 只是 MediaStore.EXTRA_OUTPUT 没有你的包名.

As stealthcopter said, intent extra is just MediaStore.EXTRA_OUTPUT without your package name.

仅供参考.我猜这个操作实际上不需要你指定的任何权限.

Not an issue just FYI. I guess none of the permissions you specified are actually required for this operation.

这是我的代码示例:

final int REQUEST_FROM_CAMERA=1;

private File getTempFile()
{
    //it will return /sdcard/image.tmp
    return new File(Environment.getExternalStorageDirectory(),  "image.tmp");
}

private void getPhotoClick()
{
  Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  intent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(getTempFile()));
  startActivityForResult(intent, REQUEST_FROM_CAMERA);
}


protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  if (requestCode == REQUEST_FROM_CAMERA && resultCode == RESULT_OK) {
    InputStream is=null;

    File file=getTempFile();
    try {
        is=new FileInputStream(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

    //On HTC Hero the requested file will not be created. Because HTC Hero has custom camera
    //app implementation and it works another way. It doesn't write to a file but instead
    //it writes to media gallery and returns uri in intent. More info can be found here:
    //http://stackoverflow.com/questions/1910608/android-actionimagecapture-intent
    //http://code.google.com/p/android/issues/detail?id=1480
    //So here's the workaround:
    if(is==null){
        try {
            Uri u = data.getData();
            is=getContentResolver().openInputStream(u);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    //Now "is" stream contains the required photo, you can process it
    DoSomeProcessing(is);

    //don't forget to remove the temp file when it's not required. 
  }

}

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