在脸书墙上张贴图片

Question

我从早上开始就一直在寻找在 facebook 墙上张贴图片并用谷歌搜索它，得到了很多关于张贴的信息，但我没有运气。我可以在没有任何错误的情况下发布链接，但是一旦我尝试获取 NullPointer 异常的图像

在我的按钮单击事件侦听器后，我正在调用此方法。如果我取消注释链接参数，那么它将显示一个询问共享和取消的对话框，如果我输入 params.putByteArray("picture", data); 这段代码，我将得到以下 logcat 错误

09-15 15:51:50.647: E/AndroidRuntime(9716): FATAL EXCEPTION: main
09-15 15:51:50.647: E/AndroidRuntime(9716): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.m2fpremiun.dressup/com.m2fpremiun.dressup.FBProjectActivity}: java.lang.NullPointerException
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2189)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2216)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread.access$600(ActivityThread.java:149)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.os.Looper.loop(Looper.java:153)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread.main(ActivityThread.java:5000)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at java.lang.reflect.Method.invokeNative(Native Method)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at java.lang.reflect.Method.invoke(Method.java:511)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at dalvik.system.NativeStart.main(Native Method)
09-15 15:51:50.647: E/AndroidRuntime(9716): Caused by: java.lang.NullPointerException
09-15 15:51:50.647: E/AndroidRuntime(9716):     at libcore.net.UriCodec.encode(UriCodec.java:132)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at java.net.URLEncoder.encode(URLEncoder.java:50)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.facebook.android.Util.encodeUrl(Util.java:85)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.facebook.android.Facebook.dialog(Facebook.java:774)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.m2fpremiun.dressup.FBProjectActivity.postToWall(FBProjectActivity.java:436)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.m2fpremiun.dressup.FBProjectActivity.loginToFacebook(FBProjectActivity.java:288)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at com.m2fpremiun.dressup.FBProjectActivity.onCreate(FBProjectActivity.java:83)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.Activity.performCreate(Activity.java:5020)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-15 15:51:50.647: E/AndroidRuntime(9716):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2153)
09-15 15:51:50.647: E/AndroidRuntime(9716):     ... 11 more

请任何人帮助我解决这个问题。

public void postToWall() {
    // post on user's wall.
    byte[] data = null;
     Bundle params = new Bundle();   
      //postParams.putString("description","I'm playing JackPac and Scored "+hScore+" ! Can you beat my High Score?");

     // postParams.putString("link", "https://play.google.com/store/apps/details?id=com.mobi2fun.jackpac&hl=en");


      Bitmap bi = BitmapFactory.decodeFile("/storage/sdcard0/Game/test.png");

        ByteArrayOutputStream baos = new ByteArrayOutputStream();              
        bi.compress(Bitmap.CompressFormat.PNG, 100, baos);              
        data = baos.toByteArray();                

        params.putString("caption", "Image Post");
        //params.putString("description","I'm playing XYZ Game and Scored "+hScore+" ! Can you beat my High Score?");
        //params.putString("link", "https://play.google.com/store/apps/details?id=xyz.package&hl=en");

        params.putString("method", "photos.upload"); 
        params.putByteArray("picture", data);
        facebook.dialog(this, "feed",params, new DialogListener() {

        @Override
        public void onFacebookError(FacebookError e) {
        }

        @Override
        public void onError(DialogError e) {
        }

        @Override
        public void onComplete(Bundle values) {
            logoutFromFacebook();
            try {
                //facebook.logout(getApplicationContext());
                //facebook.setAccessExpires(0);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 

        }

        @Override
        public void onCancel() {
            logoutFromFacebook();
            try {
            //  facebook.logout(getApplicationContext());
                mAsyncRunner.logout(getApplicationContext(),new RequestListener() {

                    @Override
                    public void onMalformedURLException(MalformedURLException e, Object state) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onIOException(IOException e, Object state) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onFileNotFoundException(FileNotFoundException e, Object state) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onFacebookError(FacebookError e, Object         state) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onComplete(String response, Object state) {
                        // TODO Auto-generated method stub

                    }
                });
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
        }


    });

}

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

我在清单文件中给出的这些权限

我已检查此链接并尝试了所有代码但没有运气Facebook wall post with text and image Upload image to FaceBook from SDCard

Answer 1

我使用此代码在 facebook 墙上分享文本和图像。其作品。可能对你有帮助。试试这个。

从您的 oncreate 方法调用 facebooksharing 方法，如下面的代码所示。你可以从你想要的地方调用它。

CallbackManager callbackManager;
private LoginManager manager;

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		FacebookSdk.sdkInitialize(this.getApplicationContext());
		setContentView(R.layout.Your_layout);
		callbackManager = CallbackManager.Factory.create();

		//call method for sharing post
		FaceBookSharing();
}

public void FaceBookSharing() {
List<String> permissionNeeds = Arrays.asList("publish_actions");
	manager = LoginManager.getInstance();
	manager.logInWithPublishPermissions(this, permissionNeeds);

	manager.registerCallback(callbackManager,
		new FacebookCallback<LoginResult>() {
			@Override
			public void onSuccess(LoginResult loginResult) {
				PostImage();
			}

			@Override
			public void onCancel() {
				System.out.println("onCancel");
			}

			@Override
				public void onError(FacebookException exception) {
				System.out.println("onError");
			}
	});
}
private void PostImage() {
	Bitmap image = BitmapFactory.decodeResource(getResources(),
				R.drawable.ic_launcher);

	SharePhoto photo = new SharePhoto.Builder().setBitmap(image)
				.setCaption("Hey this is Demo post!")
				.build();

	SharePhotoContent content = new SharePhotoContent.Builder().addPhoto(
				photo).build();

	ShareApi.share(content, null);
	Toast.makeText(this, "Succsesfully posted on your wall", Toast.LENGTH_LONG)
	.show();	
}