因为我想自定义登录文本
gravity的起始位置，所以我遇到了
setCompoundDrawablePadding方法的问题。最终我通过使用自定义布局解决了这个问题。我认为这是一种更容易自定义Facebook登录按钮的方法。
以下是最终效果：
布局
xml：
<LinearLayout
android:id="@+id/fb_login_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:background="@drawable/com_facebook_button_background"
android:orientation="horizontal">
<ImageView
android:layout_width="38dp"
android:layout_height="38dp"
android:layout_gravity="center_vertical"
android:layout_marginBottom="1dp"
android:layout_marginLeft="1dp"
android:layout_marginStart="1dp"
android:layout_marginTop="1dp"
android:padding="8dp"
android:src="@drawable/com_facebook_button_icon" />
<TextView
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center_vertical"
android:padding="8dp"
android:text="Log in with Facebook"
android:textColor="@color/white"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
处理自定义 Facebook 登录按钮点击的 Java 代码：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
findViewById(R.id.fb_login_btn).setOnClickListener(this);
boolean login = AccessToken.getCurrentAccessToken() != null;
updateFacebookLogInButton(login);
new AccessTokenTracker() {
@Override
protected void onCurrentAccessTokenChanged(
AccessToken oldAccessToken,
AccessToken currentAccessToken) {
if (currentAccessToken == null) {
updateFacebookLogInButton(false);
}
}
};
FacebookCallback<LoginResult> facebookCallback = new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
updateFacebookLogInButton(true);
handleLoginResult(loginResult.getAccessToken());
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException error) {
error.printStackTrace();
}
};
callbackManager = CallbackManager.Factory.create();
loginManager = LoginManager.getInstance();
loginManager.registerCallback(callbackManager, facebookCallback);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.fb_login_btn:
if (AccessToken.getCurrentAccessToken() == null) {
loginManager.logInWithReadPermissions(this, Arrays.asList("public_profile", "email"));
} else {
String logout = getResources().getString(
com.facebook.R.string.com_facebook_loginview_log_out_action);
String cancel = getResources().getString(
com.facebook.R.string.com_facebook_loginview_cancel_action);
String message;
Profile profile = Profile.getCurrentProfile();
if (profile != null && profile.getName() != null) {
message = String.format(
getResources().getString(
com.facebook.R.string.com_facebook_loginview_logged_in_as),
profile.getName());
} else {
message = getResources().getString(
com.facebook.R.string.com_facebook_loginview_logged_in_using_facebook);
}
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(message)
.setCancelable(true)
.setPositiveButton(logout, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
loginManager.logOut();
}
})
.setNegativeButton(cancel, null);
builder.create().show();
}
break;
default:
break;
}
}
private Bundle getRequestParameters() {
Bundle parameters = new Bundle();
parameters.putString("fields", "id,name,email,gender");
return parameters;
}
private void updateFacebookLogInButton(boolean login) {
TextView loginTextView = (TextView) findViewById(R.id.fb_login_tv);
if (login) {
loginTextView.setText("Log out");
} else {
loginTextView.setText("Log in with Facebook");
}
}
private void handleRequestResult(JSONObject object) {
}
