当我使用ACTION_IMAGE_CAPTURE来拍照时,我得到一个NullPointerException

Question

我有一个相当简单的应用程序,从菜单启动相机.相机发射很好,但是当我拍完照片后拍到OK时,我的nexus上有一个NPE:

E/AndroidRuntime( 3891): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=0, result=-1, data=null} to activity {net.asplode.tr/net.asplode.tr.PostImage}: java.lang.NullPointerException
E/AndroidRuntime( 3891):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3515)
E/AndroidRuntime( 3891):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3557)
E/AndroidRuntime( 3891):    at android.app.ActivityThread.access$2800(ActivityThread.java:125)
E/AndroidRuntime( 3891):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2063)
E/AndroidRuntime( 3891):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 3891):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 3891):    at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime( 3891):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 3891):    at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 3891):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime( 3891):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime( 3891):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 3891): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 3891):    at net.asplode.tr.PostImage.onActivityResult(PostImage.java:92)
E/AndroidRuntime( 3891):    at android.app.Activity.dispatchActivityResult(Activity.java:3890)
E/AndroidRuntime( 3891):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3511)
E/AndroidRuntime( 3891):    ... 11 more
W/ActivityManager(   85):   Force finishing activity net.asplode.tr/.PostImage

码:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() == R.id.mnuCamera) {
        Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        ContentValues values = new ContentValues();
        values.put(Media.TITLE, "image");
        Uri tempPhotoUri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);
        cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, tempPhotoUri);
        startActivityForResult(cameraIntent, FROM_CAMERA);
        return true;
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != RESULT_OK) {
        return;
    }
    Uri imageUri = data.getData();
    Log.i("imageUri: ", imageUri.toString());
}

Answer 1

原来相机应用程序没有发送EXTRA_OUTPUT,这就是它为空的原因.然而,一些相机应用程序(如英雄)做.真棒.所以答案是指定EXTRA_OUTPUT.nexus one相机应用程序会将图像保存到该位置.然后在onActivityResult()中检查intent是否为null.如果不是,请使用data.getData(),如果是,则通过常量使用EXTRA_OUTPUT中的特定位置并将其插入Mediastore.Urgh.