我一直在努力使用 android 和 Facebook 的图形 API,我相信这对于中级程序员来说是小菜一碟。我想要的是一个非常简单的 Android 应用程序,它让用户登录 Facebook,让用户同意访问信息,最后无缝查询图形 API 以获取用户朋友。我提到这项工作是无缝的,因为我见过许多需要用户按下“交友”按钮的示例应用程序,但我不希望这样。我希望提取用户朋友而不需要他推送任何东西。
我已经粘贴了下面的代码。我能够登录并授予我的应用程序权限。接下来,我希望它显示我的朋友,但它只是将我引导到一个空白页面。问题可能是我在错误的位置访问图形 API,因为Logcat 不包含我在请求之前和之后打印的消息。请你帮助我好吗。
公共类 FacebookLogin 扩展 Activity {
Facebook mFacebook = new Facebook("XXXXXXXXXXXX");
AsyncFacebookRunner mAsyncRunner = new AsyncFacebookRunner(mFacebook);
View linearLayout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
linearLayout = findViewById(R.id.main_layout);
mFacebook.authorize(this, new DialogListener() {
@Override
public void onComplete(Bundle values)
{
Log.d("Facebook-Example-Friends Request", "Started API request");
mAsyncRunner.request("me/friends", new FriendsRequestListener());
Log.d("Facebook-Example-Friends Request", "Finished API request");
}
@Override
public void onFacebookError(FacebookError error) {}
@Override
public void onError(DialogError e) {}
@Override
public void onCancel() {}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
mFacebook.authorizeCallback(requestCode, resultCode, data);
}
public class FriendsRequestListener implements RequestListener
{
/**
* Called when the request to get friends has been completed.
* Retrieve, parse and display the JSON stream.
*/
public void onComplete(final String response)
{
Log.d("Facebook-Example-Friends Request", "FriendsListenerOnComplete");
try
{
JSONObject json = Util.parseJson(response);
final JSONArray friends = json.getJSONArray("data");
FacebookLogin.this.runOnUiThread(new Runnable()
{
public void run()
{
int l = (friends != null ? friends.length() : 0);
for (int i=0; i<l; i++)
{
try
{
JSONObject o = friends.getJSONObject(i);
TextView tv = new TextView(FacebookLogin.this);
tv.setText(o.getString("name"));
((LinearLayout) linearLayout).addView(tv);
}
catch(JSONException e)
{
Toast.makeText(getApplicationContext(), "JSON parsing error", Toast.LENGTH_LONG);
}
}
}
});
}
catch(JSONException e)
{
Log.d("Facebook-Example-Friends Request", "JSON Error in response");
}
catch(FacebookError e)
{
Log.d("Facebook-Example-Friends Request", "Facebook Error in response");
}
}
}
}