我的应用程序旨在允许用户将视频上传到他们的 Facebook 墙上。以下代码与许多其他工作代码示例非常相似此代码给了我空指针异常：
这是我的主要课程：
公共类 MainActivity 扩展 Activity {
Session session;
Facebook facebook=new Facebook("367714506687419");
private int mAuthAttempts = 0;
String access_token=null;
long expires=0;
Context context;
String Permissions[]=new String[] {
"publish_stream", "read_stream" , "video_upload" , "publish_actions" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button logout=(Button) findViewById(R.id.logout);
context=this;
Button upload_video=(Button) findViewById(R.id.upload_video);
// start Facebook Login
Session.openActiveSession(this, true, new Session.StatusCallback() {
@Override
public void call( Session session, SessionState state, Exception exception) {
if (session.isOpened()) {
// make request to the /me API
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
// callback after Graph API response with user object
@SuppressWarnings("deprecation")
@Override
public void onCompleted(GraphUser user, Response response) {
if (user != null) {
TextView welcome = (TextView) findViewById(R.id.welcome);
welcome.setText("Hello " + user.getName() + "!");
if (access_token != null) {
facebook.setAccessToken(access_token);
}
if (expires != 0) {
facebook.setAccessExpires(expires);
}
if (!facebook.isSessionValid()) {
facebook.authorize(MainActivity.this, Permissions, new DialogListener(){
@Override
public void onComplete(Bundle values) {
access_token=facebook.getAccessToken();
expires=facebook.getAccessExpires();
}
@Override
public void onFacebookError(FacebookError e) {
// TODO Auto-generated method stub
}
@Override
public void onError(DialogError e) {
// TODO Auto-generated method stub
}
@Override
public void onCancel() {
// TODO Auto-generated method stub
}
});
}
}
}
});
}
}
});
upload_video.setOnClickListener(new OnClickListener() {
@SuppressWarnings("deprecation")
@Override
public void onClick(View arg0) {
if(session.isOpened()){
//String dataPath = "/mnt/sdcard/DCIM/Camera/VID_20130725_023450.mp4";
String path="/sdcard/DCIM/Camera/1.mp4";
byte[] data = null;
String dataPath = "/sdcard/DCIM/Camera/1.mp4";
String dataMsg = "Your video description here.";
String dataName = "1.mp4";
Bundle param;
facebook = new Facebook("367714506687419");
AsyncFacebookRunner mAsyncRunner = new AsyncFacebookRunner(facebook);
InputStream is = null;
try {
is = new FileInputStream(dataPath);
data = readBytes(is);
param = new Bundle();
param.putString(Facebook.TOKEN, access_token);
param.putString("message", dataMsg);
param.putByteArray("video", data);
//param.putString("filename", dataName);
mAsyncRunner.request("me/videos", param, "POST", new fbRequestListener(), null);
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
else{
Log.d("Please Check ur access tocken", "");
}
}
});
这是 fbRequestListener.java
公共类 fbRequestListener 实现 RequestListener {
@Override
public void onComplete(String response, Object state) {
Log.e("response", response);
}
@Override
public void onIOException(IOException e, Object state) {
Log.e("", "onIOException");
e.printStackTrace();
}
@Override
public void onFileNotFoundException(FileNotFoundException e, Object state) {
Log.e("", "onFileNotFoundException");
e.printStackTrace();
}
@Override
public void onMalformedURLException(MalformedURLException e, Object state) {
Log.e("", "onMalformedURLException");
e.printStackTrace();
}
@Override
public void onFacebookError(FacebookError e, Object state) {
Log.e("", "onFacebookError");
e.printStackTrace();
}
}
原木猫是：
致命异常：线程 1044 java.lang.NullPointerException
在 libcore.net.UriCodec.decode(UriCodec.java:149)
在 java.net.URLDecoder.decode(URLDecoder.java:45)
在 com.facebook.android.Util.openUrl(Util.java:186)
在 com.facebook.android.Facebook.requestImpl(Facebook.java:806)
在 com.facebook.android.AsyncFacebookRunner$2.run(AsyncFacebookRunner.java:**