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因为不推荐使用 showDialog()，所以我现在必须使用 DialogFragments 来修复我的图像选择器功能。

我从这里得到了代码，到目前为止它就像一个魅力。

现在，为了简单起见，我将只显示必要的代码行。首先，单击Activity A上的按钮以选择带有此对话框的图像后：

ImagePickerFragment ip= new ImagePickerFragment(); 
ip.show(getSupportFragmentManager(), "imagePicker");

片段代码如下所示：

 public class ImagePickerFragment extends DialogFragment{

    public Dialog onCreateDialog(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        //.. creating an adapter

        return new AlertDialog.Builder(getActivity())
        .setTitle("select Image")
        .setAdapter(adapter, new DialogInterface.OnClickListener(){

            public void onClick(DialogInterface dialog, int which){

              if (which == 0){ // from camera
                Intent intent    = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                File file        = new File(Environment.getExternalStorageDirectory(),
                                    "picture_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
                mImageCaptureUri = Uri.fromFile(file);

                intent.putExtra(MediaStore.EXTRA_OUTPUT, mImageCaptureUri);

                getActivity().startActivityForResult(intent, PICK_FROM_CAMERA);
              } 
              else{  // pick from file
                Intent intent = new Intent();

                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);

                getActivity().startActivityForResult(Intent.createChooser(intent, "complete Action..."), PICK_FROM_FILE);
              }
           }

         }).create():
     }
}

现在，回到我的Activity A中，onActivityResult() 代码如下所示：

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != RESULT_OK) return;

    if (requestCode == PICK_FROM_FILE){
    mImageCaptureUri = data.getData();
    path = getRealPathFromURI(mImageCaptureUri); //from Gallery

    if (path == null)
    path = mImageCaptureUri.getPath(); //from File Manager
    } 
    else path = data.getData().getPath(); **// this is were the Code starts when picture was taken with camera and where the exceptions come from..**

    if(path != null){
        // do something with image
    }
}

这实际上适用于从画廊中挑选的图像，但由于某种原因不适用于相机拍摄的照片。加载相机后，我可以拍照，当我接受该照片进行保存时，应用程序崩溃。

requestCodes 是正确的，但我发现从 Intent 的数据发回的 Uri 始终为空，即使我将它单独放在 Intent 中（即 putExtra、bundle）。不过，我真的很想知道为什么它适用于画廊：-/

也许你们中的一个人知道我做错了什么？

PS：我很抱歉我的英语不好。

更新：我被要求提供崩溃信息。

09-06 01:58:50.929: E/AndroidRuntime(6322): FATAL EXCEPTION: main
09-06 01:58:50.929: E/AndroidRuntime(6322): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {android.pack.coding/android.myactivitys.MainActivity}: java.lang.NullPointerException
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2980)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:3023)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread.access$1100(ActivityThread.java:123)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1177)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.os.Looper.loop(Looper.java:137)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread.main(ActivityThread.java:4424)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at java.lang.reflect.Method.invokeNative(Native Method)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at java.lang.reflect.Method.invoke(Method.java:511)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at dalvik.system.NativeStart.main(Native Method)
09-06 01:58:50.929: E/AndroidRuntime(6322): Caused by: java.lang.NullPointerException
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.myactivitys.MainActivity.onActivityResult(MainActivity.java:298)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.Activity.dispatchActivityResult(Activity.java:4649)
09-06 01:58:50.929: E/AndroidRuntime(6322):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2976)
09-06 01:58:50.929: E/AndroidRuntime(6322):     ... 11 more
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