Null pointer after capturing image using android c

2020-02-01 04:02发布

in my application,i am using android devices camera to capture an image. for some devices it works fine but some are not. I just tested it on LG nexus 4 E960, after i captured the image my application went crash without able to save the result. this is my code:

//Using intent to open camera
  Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
  startActivityForResult(intent,CAMERA_CAPTURE); 

in the activityResult :

protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if(resultCode==RESULT_OK)
    {
        if(requestCode==CAMERA_CAPTURE)
        {   
            Bitmap pictTaken = null ;
            Bundle extras = data.getExtras();
            if(extras.keySet().contains("data"))
            {
                pictTaken = (Bitmap) extras.get("data");
                picUri = getIntent().getData();
            }
                    else{
                     picUri = getIntent().getData();
                try {
                    pictTaken = decodeUri(picUri);
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                     }
            Intent cropIntent= new Intent (this, Crop.class);
            cropIntent.putExtra("data", picUri.toString());
            cropIntent.putExtra("pict", pictTaken);
            cropIntent.putExtra("code","camera");
            startActivity(cropIntent);
            }
        }

after captured and save it, the image show in next activity called Crop.class here is my logcat

     12-12 13:26:36.340: E/AndroidRuntime(23575): FATAL EXCEPTION: main
 12-12 13:26:36.340: E/AndroidRuntime(23575): Process: com.example.cobaandroid, PID: 23575
 12-12 13:26:36.340: E/AndroidRuntime(23575): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.example.cobaandroid/com.example.cobaandroid.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.toString()' on a null object reference
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread.deliverResults(ActivityThread.java:3368)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread.handleSendResult(ActivityThread.java:3411)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread.access$1300(ActivityThread.java:138)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.os.Handler.dispatchMessage(Handler.java:102)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.os.Looper.loop(Looper.java:136)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread.main(ActivityThread.java:5050)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at java.lang.reflect.Method.invoke(Native Method)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
 12-12 13:26:36.340: E/AndroidRuntime(23575): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.toString()' on a null object reference
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at com.example.cobaandroid.MainActivity.onActivityResult(MainActivity.java:226)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.Activity.dispatchActivityResult(Activity.java:5433)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   at android.app.ActivityThread.deliverResults(ActivityThread.java:3364)
 12-12 13:26:36.340: E/AndroidRuntime(23575):   ... 9 more

I got a problem to open/use the camera that work at most android devices, the main goal of this project is heavily depend on the use of the camera. please hand me your help, thank you..

8条回答
放我归山
2楼-- · 2020-02-01 04:31

replace

picUri = getIntent().getData();

with

picUri = data.getData();

and try once...

查看更多
等我变得足够好
3楼-- · 2020-02-01 04:31

I have the same issue in my app. The problem is that when onActivityResult is executed, data is null so you can't get anything from the camera Activity. There should be another way to solve this rather than using the Application class, because it gets really complicate when you handle more than one photo.

查看更多
登录 后发表回答