相机意图仅在某些设备上返回null

Question

 imageView.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {
            Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

            startActivityForResult(cameraIntent, 1);
        }
    });

和onActivityResult

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1 && resultCode == -1) {
        image = (Bitmap) data.getExtras().get("data");
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        // Must compress the Image to reduce image size to make upload easy
        image.compress(Bitmap.CompressFormat.PNG, 50, stream);
        byte[] byte_arr = stream.toByteArray();
        // Encode Image to String
        encodedString = Base64.encodeToString(byte_arr, 0);
        Uri selectedImageUri = data.getData();
        img_path = getRealPathFromURI(selectedImageUri);
      //  Uri tempUri = getImageUri(getApplicationContext(), image);
        imageView.setImageBitmap(image);
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);
    }
}

和错误的堆栈跟踪

stack_trace=java.lang.runtimeException：未能将结果ResultInfo{who=null,request=1,result=-1,data=intent{act=inline-data（havs extras）}}传递到活动{com.madhours/com.madhours.activities.activitySignup}:java.lang.nullpointerException：试图在Android.app.activityThread.DeliverResults（ActivityThread.java:3659)和ythread.Access$1300(ActivityThread.java:155)，android.app.activityThread$H.HandleMessage(ActivityThread.java:1366)，android.os.handler.dispatchMessage(handler.java:102)，android.os.handler.dispatchMessage(handler.java:135)，android.os.handler.dispatchMessage(handler.java:135)，android.app.activityThread.main（it.java:905)在com.android.internal.os.zygoteinit.main(zygoteinit.java:700)原因：java.lang.nullpointerException：试图在:3655)...10个更多的java.lang.nullPointerException：试图在com.madhours.activities.activitySignup.GetRealPathFroMuri在Android.app.ActivityThread.Access$1300(ActivityThread.java:155)在Android.app.ActivityThread.$H.HandleMessage(ActivityThread.java:1366)在Android.os.handler.DispatchMessage(handler.java:102)，android.os.handler.dispatchMessage(handler.java:135)，android.app.activityThread.loop(handler.java:135)，android.app.activityThread.main（al.os.zygoteinit$methodandargscaller.run(zygoteinit.java:905)，地址为com.android.internal.os.zygoteinit.main(zygoteinit.java:700)

Answer 1

这里会有什么问题？

问题是您正在对返回的intent调用getData()。返回URI不是action_media_store协定的一部分：

调用方可能会传递额外的EXTRA_OUTPUT，以控制将此图像写入的位置。如果EXTRA_OUTPUT不存在，则在额外字段中返回一个小尺寸图像作为位图对象。这对于只需要一个小图像的应用程序很有用。如果EXTRA_OUTPUT存在，那么全尺寸图像将被写入EXTRA_OUTPUT的Uri值。

/***
 Copyright (c) 2008-2016 CommonsWare, LLC
 Licensed under the Apache License, Version 2.0 (the "License"); you may not
 use this file except in compliance with the License. You may obtain a copy
 of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
 by applicable law or agreed to in writing, software distributed under the
 License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
 OF ANY KIND, either express or implied. See the License for the specific
 language governing permissions and limitations under the License.

 From _The Busy Coder's Guide to Android Development_
 https://commonsware.com/Android
 */

package com.commonsware.android.camcon;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import java.io.File;

public class CameraContentDemoActivity extends Activity {
  private static final String EXTRA_FILENAME=
    "com.commonsware.android.camcon.EXTRA_FILENAME";
  private static final String FILENAME="CameraContentDemo.jpeg";
  private static final int CONTENT_REQUEST=1337;
  private File output=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Intent i=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

    if (savedInstanceState==null) {
      File dir=
        Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);

      dir.mkdirs();
      output=new File(dir, FILENAME);
    }
    else {
      output=(File)savedInstanceState.getSerializable(EXTRA_FILENAME);
    }

    if (output.exists()) {
      output.delete();
    }

    i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(output));

    startActivityForResult(i, CONTENT_REQUEST);
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    outState.putSerializable(EXTRA_FILENAME, output);
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode,
                                  Intent data) {
    if (requestCode == CONTENT_REQUEST) {
      if (resultCode == RESULT_OK) {
        Intent i=new Intent(Intent.ACTION_VIEW);

        i.setDataAndType(Uri.fromFile(output), "image/jpeg");
        startActivity(i);
        finish();
      }
    }
  }
}