我正在将Facebook与Android集成，我想在使用Phot时，将其保存到SDCard，然后上传到Facebook。
这是我的代码：
photo_up=(Button)findViewById(R.id.camera_foto_button);
photo_up.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
final Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(PlaceScreen.this)) );
startActivityForResult(intent,CAMERA_REQUEST);
}
});
private File getTempFile(Context context){
//it will return /sdcard/image.tmp
final File path = new File( Environment.getExternalStorageDirectory(), context.getPackageName() );
if(!path.exists()){
path.mkdir();
}
return new File(path, "image.png");
}
以及活动结果
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case CAMERA_REQUEST:{
final File file = getTempFile(this);
try {
bmp = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.fromFile(file) );
// do whatever you want with the bitmap (Resize, Rename, Add To Gallery, etc)
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byteArray = stream.toByteArray(); // convert camera photo to byte array
Bundle params = new Bundle();
params.putByteArray("picture", byteArray);
params.putString("message", "Have fun");
Utility.mAsyncRunner.request("me/photos", params,
"POST", new PhotoUploadListener(), null);
break;
}
结果是：摄像机打开，imagae被捕获并保存，但我得到一个力接近，它没有上传到fb上。
我也在电话里查过了。Logcat在这里：
05-31 02:50:19.437: E/AndroidRuntime(2470): FATAL EXCEPTION: main
05-31 02:50:19.437: E/AndroidRuntime(2470): java.lang.RuntimeException: Unable to resume activity {com.myname.package/com.myname.package.PlaceScreen}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1888, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.myname.package/com.myname.package.PlaceScreen}: java.lang.NullPointerException
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2124)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2139)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1672)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2836)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.access$1600(ActivityThread.java:117)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.os.Handler.dispatchMessage(Handler.java:99)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.os.Looper.loop(Looper.java:130)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.main(ActivityThread.java:3687)
05-31 02:50:19.437: E/AndroidRuntime(2470): at java.lang.reflect.Method.invokeNative(Native Method)
05-31 02:50:19.437: E/AndroidRuntime(2470): at java.lang.reflect.Method.invoke(Method.java:507)
05-31 02:50:19.437: E/AndroidRuntime(2470): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
05-31 02:50:19.437: E/AndroidRuntime(2470): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
05-31 02:50:19.437: E/AndroidRuntime(2470): at dalvik.system.NativeStart.main(Native Method)
05-31 02:50:19.437: E/AndroidRuntime(2470): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1888, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.myname.package/com.myname.package.PlaceScreen}: java.lang.NullPointerException
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.deliverResults(ActivityThread.java:2536)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2111)
05-31 02:50:19.437: E/AndroidRuntime(2470): ... 13 more
05-31 02:50:19.437: E/AndroidRuntime(2470): Caused by: java.lang.NullPointerException
05-31 02:50:19.437: E/AndroidRuntime(2470): at com.myname.package.PlaceScreen.onActivityResult(PlaceScreen.java:325)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.Activity.dispatchActivityResult(Activity.java:3908)
05-31 02:50:19.437: E/AndroidRuntime(2470): at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
05-31 02:50:19.437: E/AndroidRuntime(2470): ... 14 more
编辑：
我的bmp在哪里是空的。为什么？怎么了？
bmp = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.fromFile(file) );
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
当我可以在图库中看到图像时，有人能找出我的bmp为空的原因吗？这意味着图像是正常拍摄的，但由于bmp=mediastore.images.media，什么也得不到
最佳答案
当使用网络上的通用代码调用摄像头拍照并检索时，我在三星设备中遇到了一些问题，当时也发生了同样的错误Failure delivering result ResultInfo，由于任何api级别或设备依赖性，找不到任何解决方案。
但为了克服这个问题，我用另一种方法编写了代码，代码如下：
1）呼叫摄像机
String _path = Environment.getExternalStorageDirectory()
+ File.separator + "TakenFromCamera.png";
File file = new File(_path);
Uri outputFileUri = Uri.fromFile(file);
Intent intent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
startActivityForResult(intent, 1212);
2）在ActivityResult中获取位图
if (requestCode == 1212) {
String _path = Environment.getExternalStorageDirectory()
+ File.separator + "TakenFromCamera.png";
mBitmap = BitmapFactory.decodeFile(_path);
if (mBitmap == null) {
// bitmap still null
} else {
// set bitmap in imageview
}
}