几天来，我一直在寻找有关使用图形 API 制作带有图标或图像和一些文本的 facebook 墙贴的简单教程。我尝试了无数教程，它们看起来都非常复杂，我无法让它们工作。即使是 SDK 附带的示例也不会创建会话。
我已经成功设置了 SDK 并获得了我的 APP_ID，剩下的就是用于在用户墙上分享我的应用的自定义按钮的 Java 代码。
【问题讨论】：
标签： android facebook-graph-api android-fragments
您可以通过两种不同的方式在 Facebook 上发布图片。如果您想从 URL 中发布图片，您可以按如下方式发布：
Bundle parameters = new Bundle();
parameters.putString("description","your description/message");
parameters.putString("link", "your link");
parameters.putString("name", "Name of your application/ any name you want to post");
// parameters.putString("caption", " caption if any!");
parameters.putString("picture", "Link to your image");
try
{
facebook.request("me");
response = facebook.request("me/feed", parameters, "POST");
Log.d("Tests", "got response: " + response);
}
catch (Exception e)
{
e.printStackTrace();
}
或者如果您想从 SD 卡中发布图像，您可以从您要发布的图像中创建一个位图，然后将其转换为 ByteArray 并发布如下：
Bundle parameters = new Bundle();
Log.e("byte array", ""+mByteArray);
parameters.putString("message", "your message");
parameters.putByteArray("picture", mByteArray);
try
{
facebook.request("me");
response = facebook.request("me/photos", parameters, "POST");
Log.d("Tests", "got response: " + response);
}
catch (Exception e)
{
e.printStackTrace();
}
附：第一种方法是在用户的脸书墙上贴图，后者是上传用户脸书相册中的图片和留言，也将作为更新发布！
【讨论】：
您可以以非常简单的方式发布带有应用程序文本的图像。
在单击按钮小部件时调用此方法说btnImagePostToWall like...
btnImagePostToWall.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
postImageToWall();
}
});
通过向 Facebook Graph API 发出请求来获取个人资料信息......
public void postImageToWall() {
facebook.authorize(
this,
new String[] { "user_photos,publish_checkins,publish_actions,publish_stream" },
new DialogListener() {
@Override
public void onFacebookError(FacebookError e) {
// TODO Auto-generated method stub
}
@Override
public void onError(DialogError dialogError) {
// TODO Auto-generated method stub
}
@Override
public void onComplete(Bundle values) {
postImageonWall();
}
@Override
public void onCancel() {
// TODO Auto-generated method stub
}
});
}
private void postImageonWall() {
byte[] data = null;
Bitmap bi = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPEG, 100, baos);
data = baos.toByteArray();
Bundle params = new Bundle();
params.putString(Facebook.TOKEN, facebook.getAccessToken());
params.putString("method", "photos.upload");
params.putByteArray("picture", data); // image to post
params.putString("caption", "My text on wall with Image "); // text to post
AsyncFacebookRunner mAsyncRunner = new AsyncFacebookRunner(facebook);
mAsyncRunner.request(null, params, "POST", new SampleUploadListener(),
null);
}
只需创建一个实现 AsyncFacebookRunner.RequestListener 的类 SampleUploadListener...
class SampleUploadListener implements AsyncFacebookRunner.RequestListener {
@Override
public void onComplete(String response, Object state) {
}
@Override
public void onIOException(IOException e, Object state) {
}
@Override
public void onFileNotFoundException(FileNotFoundException e,
Object state) {
}
@Override
public void onMalformedURLException(MalformedURLException e,
Object state) {
}
@Override
public void onFacebookError(FacebookError e, Object state) {
}
}
希望这对您有所帮助.... :-)
【讨论】：
给你。您可能需要进行一些调试等，但这对我有用。
FbLoginActivity 类：执行身份验证并发布到您的墙和/或应用程序的墙。
用法：
Intent i = new Intent(getApplicationContext(), FbLoginActivity.class);
i.putExtra("SCORE", score);
startActivity(i);
FbLoginActivity：
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.MalformedURLException;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.widget.Toast;
import com.facebook.android.AsyncFacebookRunner;
import com.facebook.android.AsyncFacebookRunner.RequestListener;
import com.facebook.android.DialogError;
import com.facebook.android.Facebook;
import com.facebook.android.Facebook.DialogListener;
import com.facebook.android.FacebookError;
import com.facebook.android.Util;
public class FbLoginActivity extends Activity {
private final String TAG = "FbLoginActivity";
private String token; // used to identify the fb user
private static final String FACEBOOK_APP_ID = "your_key_here";
//private String[] permissions = { "email", "friends_about_me", "friends_location"};
private String[] permissions = {"publish_stream" };
private String rankText;
public static String userName;
private AlertDialog alertDialog;
private boolean isMyWall = false, isAppWall = true;
// facebook SSO
Facebook fb = new Facebook(FACEBOOK_APP_ID);
private AsyncFacebookRunner runner = new AsyncFacebookRunner(fb);
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.register);
showFbDialog();
SessionEvents.addAuthListener(new SampleAuthListener());
}
private void accessUserData(String token) {
// get information about the currently logged in user
runner.request("me", meRequestListener);
}
private String getRankText() {
String txt = "your text to be shared here"
return txt;
}
private void postToFb() {
// post to feed
Bundle params = new Bundle();
params.putString("to", "me");
params.putString("message", "test msg");
try {
runner.request("me/feed", params, "POST", meRequestListener, null);
} catch(Throwable t) {
Log.e(TAG, "caught throwable: " + t, t);
Toast.makeText(this, "Error on login, is Facebook Installed?", Toast.LENGTH_LONG).show();
startActivity(new Intent(getApplicationContext(), MaleRankingActivity.class));
}
}
public void postImageonWall() {
byte[] data = null;
Bitmap bi = BitmapFactory.decodeFile("/sdcard/viewitems.png");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bi.compress(Bitmap.CompressFormat.JPEG, 100, baos);
data = baos.toByteArray();
Bundle params = new Bundle();
params.putString(Facebook.TOKEN, fb.getAccessToken());
params.putString("method", "photos.upload");
params.putByteArray("picture", data);
AsyncFacebookRunner mAsyncRunner = new AsyncFacebookRunner(fb);
//mAsyncRunner.request(null, params, "POST", new SampleUploadListener(), null);
}
private RequestListener meRequestListener = new RequestListener () {
//called on successful completion of the Request
public void onComplete(final String response, final Object state){
Log.d(TAG, "<onComplete> response: " + response);
try {
JSONObject fbResponse = new JSONObject(response);
// set userName
userName = fbResponse.getString("name");
Log.d(TAG, "<onComplete> fbResponse: " + fbResponse);
} catch (JSONException e) {
Log.e(TAG, "caught exception: " + e, e);
}
}
// called if there is an error
public void onFacebookError(FacebookError error, final Object state){}
public void onMalformedURLException(java.net.MalformedURLException e, Object state){}
public void onFileNotFoundException(FileNotFoundException arg0, Object arg1) {
// TODO Auto-generated method stub
}
public void onIOException(IOException arg0, Object arg1) {
// TODO Auto-generated method stub
}
};
private void authorizeAndPost() {
final Bundle params = new Bundle();
try {
// force authorization
//fb.logout(this);
/*
* Get existing access_token if any
*/
SharedPreferences mPrefs = getPreferences(MODE_PRIVATE);
String access_token = mPrefs.getString("access_token", null);
long expires = mPrefs.getLong("access_expires", 0);
if(access_token != null) {
fb.setAccessToken(access_token);
}
if(expires != 0) {
fb.setAccessExpires(expires);
}
fb.authorize(this, permissions, new DialogListener() {
public void onComplete(Bundle values) {
Log.d(TAG, "<onComplete> entry");
// get rank text
rankText = getRankText();
// set text
params.putString("message", rankText);
// post to ur wall
if (isMyWall) {
runner.request("me/feed", params, "POST", new WallPostRequestListener(), null);
}
// post to rate ur date wall
if (isAppWall) {
runner.request("259166150820823/feed", params, "POST", new WallPostRequestListener(), null);
}
// toast
CharSequence text = "Posted date to Facebook!";
int duration = Toast.LENGTH_LONG;
Toast toast = Toast.makeText(getApplicationContext(), text, duration);
toast.show();
// start ranking activity
Intent intent = new Intent(getApplicationContext(), ShareResultActivity.class);
intent.putExtra("share_result", "You have successfully posted your date to Facebook!");
token = fb.getAccessToken();
Log.d(TAG, "<onComplete> fb access token: " + token);
//intent.putExtra("userId", token);
long token_expires = fb.getAccessExpires();
Log.d(TAG, "<onComplete> token expires: " + token_expires);
SharedPreferences prefs= PreferenceManager.getDefaultSharedPreferences(FbLoginActivity.this);
prefs.edit().putLong("access_expires", token_expires).commit();
prefs.edit().putString("access_token", token).commit();
//fb.setAccessExpires(300000); // for testing
// access user data
accessUserData(token);
//postDateToFb();
startActivity(intent);
}
public void onFacebookError(FacebookError e) {
Log.e(TAG, "fb error: " + e.getMessage(), e);
}
public void onError(DialogError e) {
Log.e(TAG, "dialog error: " + e.getMessage(), e);
}
public void onAuthFail(String error) {
Log.d("<fbExample>", "login failed: " + error);
}
public void onCancel() {
Log.d(TAG, "fb cancelled");
}
});
} catch(Throwable t) {
Log.e(TAG, "caught throwable: " + t, t);
Toast.makeText(this, "Error on login, is Facebook Installed?", Toast.LENGTH_LONG).show();
startActivity(new Intent(getApplicationContext(), LandingActivity.class));
}
}
public class WallPostRequestListener extends BaseRequestListener {
public void onComplete(final String response, final Object state) {
Log.d("Facebook-Example", "Got response: " + response);
String message = "I just rated my date a creeper!";
try {
JSONObject json = Util.parseJson(response);
message = json.getString("message");
} catch (JSONException e) {
Log.w("Facebook-Example", "JSON Error in response");
} catch (FacebookError e) {
Log.w("Facebook-Example", "Facebook Error: " + e.getMessage());
}
final String text = "Your Wall Post: " + message;
FbLoginActivity.this.runOnUiThread(new Runnable() {
public void run() {
//mText.setText(text);
}
});
}
public void onCancel() {
Log.d(TAG, "fb cancel");
}
public void onComplete(Bundle arg0) {
Log.e(TAG, "fb complete.");
}
public void onError(DialogError arg0) {
Log.e(TAG, "fb err:" + arg0.getMessage());
}
public void onFacebookError(FacebookError arg0) {
Log.e(TAG, "fb err:" + arg0.getMessage());
}
public void onFacebookError(FacebookError arg0, Object arg1) {
Log.e(TAG, "fb err:" + arg0.getMessage());
}
public void onFileNotFoundException(FileNotFoundException arg0,
Object arg1) {
Log.e(TAG, "fb err:" + arg0.getMessage(), arg0);
}
public void onIOException(IOException arg0, Object arg1) {
Log.e(TAG, "fb err:" + arg0.getMessage(), arg0);
}
public void onMalformedURLException(MalformedURLException arg0,
Object arg1) {
Log.e(TAG, "fb err:" + arg0.getMessage(), arg0);
}
}
public class SampleAuthListener implements SessionEvents.AuthListener {
public void onAuthSucceed() {
Log.d("<fbExample>", "fb auth token: " + fb.getAccessToken());
}
public void onAuthFail(String error) {
Log.d("<fbExample>", "login failed: " + error);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
fb.authorizeCallback(requestCode, resultCode, data);
}
private void showFbDialog() {
alertDialog = new AlertDialog.Builder(this)
.setTitle("I want to:")
.setMultiChoiceItems(new String[] {"Post to my wall", "Post to app's wall" },
new boolean[]{false, true, false, true, false, false, false},
new DialogInterface.OnMultiChoiceClickListener() {
public void onClick(DialogInterface dialog, int whichButton,
boolean isChecked) {
/* User clicked on a check box do some stuff */
Log.d(TAG, "multichoice got click, whichButton: " + whichButton + ", isChecked: " + isChecked);
if (whichButton == 0 && isChecked) {
isMyWall = true;
}
if (whichButton == 1 && isChecked) {
isAppWall = true;
} else if (whichButton == 1 && !isChecked) {
isAppWall = false;
}
}
})
.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
Log.d(TAG, "Ok got click");
authorizeAndPost();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
Log.d(TAG, "Cancel got click");
startActivity(new Intent(getApplicationContext(), YourActivity.class ));
}
})
.create();
alertDialog.show();
}
}
【讨论】：