如何将 GoogleApiClient 对象传递给另一个活动

Question

在我的登录活动中，我有一个谷歌登录按钮来登录。 我检查了一下，工作正常。 我有另一个按钮可以注销和撤销，并且工作正常。

这是我的登录屏幕代码。

import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.OptionalPendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements
View.OnClickListener,
GoogleApiClient.OnConnectionFailedListener
{
private static final String TAG = MainActivity.class.getSimpleName();
private static final int RC_SIGN_IN = 007;
private GoogleApiClient mGoogleApiClient;
private ProgressDialog mProgressDialog;
private SignInButton btnSignIn;
List<String> profile=new ArrayList<>();
private MyGoogleApi_Singleton myGoogleApi_singleton;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnSignIn = (SignInButton) findViewById(R.id.sign_in_button);
btnSignIn.setOnClickListener(this);
updateUI(false);
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this, this)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
/* Customizing G+ button
btnSignIn.setSize(SignInButton.SIZE_STANDARD);
btnSignIn.setScopes(gso.getScopeArray());*/
//Create a new objet to handle in all class
myGoogleApi_singleton= new MyGoogleApi_Singleton();
myGoogleApi_singleton.getInstance(mGoogleApiClient);
}

private void signIn()
{
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}

private void signOut()
{
Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(
new ResultCallback<Status>()
{
@Override
public void onResult(Status status)
{
updateUI(false);
}
});
}
private void revokeAccess()
{
Auth.GoogleSignInApi.revokeAccess(mGoogleApiClient).setResultCallback(
new ResultCallback<Status>()
{
@Override
public void onResult(Status status)
{
updateUI(false);
}
});
}
private void handleSignInResult(GoogleSignInResult result)
{
Log.d(TAG, "handleSignInResult:" + result.isSuccess());
if (result.isSuccess())
{
// Signed in successfully, show authenticated UI.
GoogleSignInAccount acct = result.getSignInAccount();
String personName = acct.getDisplayName();
String personPhotoUrl = acct.getPhotoUrl().toString();
String email = acct.getEmail();
String idnumber= acct.getId();
Log.e(TAG, "Name: " + personName + ", email: " + email
+ ", Image: " + personPhotoUrl+ ", Id Number: "+ idnumber);
//Save the data into the arraylist
profile.add(idnumber);
profile.add(personName);
profile.add(email);
profile.add(personPhotoUrl);
//save into sharedpreferences
StringBuilder stringBuilder = new StringBuilder();
for (String s:profile)
{
stringBuilder.append(s);
stringBuilder.append(",");
}
SharedPreferences sharpref = getSharedPreferences("ProfileList",0);
SharedPreferences.Editor editor = sharpref.edit();
editor.putString("ProfileList", stringBuilder.toString());
editor.commit();
goIndexScreen();
} else
{
// Signed out, show unauthenticated UI.
updateUI(false);
}
}
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.sign_in_button:
signIn();
break;
default:
break;
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_SIGN_IN)
{
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
handleSignInResult(result);
}
}
@Override
public void onStart()
{
super.onStart();
OptionalPendingResult<GoogleSignInResult> opr = Auth.GoogleSignInApi.silentSignIn(mGoogleApiClient);
if (opr.isDone())
{
// If the user's cached credentials are valid, the OptionalPendingResult will be "done"
// and the GoogleSignInResult will be available instantly.
Log.d(TAG, "Got cached sign-in");
GoogleSignInResult result = opr.get();
handleSignInResult(result);
} else
{
// If the user has not previously signed in on this device or the sign-in has expired,
// this asynchronous branch will attempt to sign in the user silently.  Cross-device
// single sign-on will occur in this branch.
showProgressDialog();
opr.setResultCallback(new ResultCallback<GoogleSignInResult>()
{
@Override
public void onResult(GoogleSignInResult googleSignInResult)
{
hideProgressDialog();
handleSignInResult(googleSignInResult);
}
});
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult)
{
// An unresolvable error has occurred and Google APIs (including Sign-In) will not
// be available.
Log.d(TAG, "onConnectionFailed:" + connectionResult);
}
//method to show a progress dialog during the SignIn
private void showProgressDialog()
{
if (mProgressDialog == null)
{
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Loading...");
mProgressDialog.setIndeterminate(true);
}
mProgressDialog.show();
}
//method to hide the progress dialog
private void hideProgressDialog()
{
if (mProgressDialog != null && mProgressDialog.isShowing())
{
mProgressDialog.hide();
}
}
//method to show or hide the buttons
private void updateUI(boolean isSignedIn)
{
if (isSignedIn)
{
btnSignIn.setVisibility(View.GONE);

} else
{
btnSignIn.setVisibility(View.VISIBLE);
}
}
//method to go to next activity
private void goIndexScreen()
{
Intent intent=new Intent(this,Index.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}

}

登录成功后，应用将跳转到另一个活动。 我需要从此活动中注销，但我需要从LoginActivity注销mGoogleApiClient，我不知道该怎么做。

我在这里创建了一个新类(单例(我的代码

import com.google.android.gms.common.api.GoogleApiClient;
class MyGoogleApi_Singleton {
private static final String TAG = "GoogleApiClient";
private static MyGoogleApi_Singleton instance = null;
private static GoogleApiClient mGoogleApiClient = null;
private MyGoogleApi_Singleton(Context context) {
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(context)
.enableAutoManage(this, this)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
}
public static MyGoogleApi_Singleton getInstance(Context context) {
if(instance == null) {
instance = new MyGoogleApi_Singleton(context);
}
return instance;
}

//methods SingIn,SignOut and Revoke
public void Login(GoogleApiClient bGoogleApiClient){

}
public void Logout(){
if(mGoogleApiClient.isConnected()) {
Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(
new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
Log.d("LOGOUT-RESULT","LOGOUT");
}
});
}
}
public void Revoke() {
if ((mGoogleApiClient.isConnected())) {
Auth.GoogleSignInApi.revokeAccess(mGoogleApiClient).setResultCallback(
new ResultCallback<Status>() {
@Override
public void onResult(Status status) {
Log.d("REVOKE-RESULT","REVOKE");
}
});
}
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
}

这是索引活动的代码

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.util.Log;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import java.util.ArrayList;
import java.util.List;
public class Index extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private ImageView ivprofile;
private TextView tvname;
private TextView tvemail;
private TextView tvidnumber;
private String picprofile;
private String name;
private String idnumber;
private String email;
final List<String> profile = new ArrayList<String>();
private View headerview;
private GoogleApiClient mGoogleApiClient;
private MyGoogleApi_Singleton myGoogleApiSingleton;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_index);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//create a headerview to conect to header of left menu
headerview=navigationView.getHeaderView(0);
ivprofile=(ImageView)headerview.findViewById(R.id.imageProfile);
tvname=(TextView)headerview.findViewById(R.id.fullName);
tvemail=(TextView)headerview.findViewById(R.id.email);
tvidnumber=(TextView) headerview.findViewById(R.id.idNumber);
//Load file saved by sharedpreferences into a new arraylist
final SharedPreferences sharpref = getSharedPreferences("ProfileList",0);
String Items = sharpref.getString("ProfileList","");
String [] listItems = Items.split(",");
for (int i=0;i<listItems.length;i++){
profile.add(listItems[i]);
}
//get the profile
idnumber=profile.get(0);
name=profile.get(1);
email=profile.get(2);
picprofile=profile.get(3);
Log.d("ArrayPerfil", name+email+idnumber+picprofile);
tvname.setText(name);
tvidnumber.setText(idnumber);
tvemail.setText(email);
Glide.with(this).load(picprofile).into(ivprofile);
//get the mgoogleapiclient objet
myGoogleApiSingleton=new MyGoogleApi_Singleton();
mGoogleApiClient=myGoogleApiSingleton.get_GoogleApiClient();

@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.index, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}else if (id == R.id.logout) {
myGoogleApiSingleton.getInstance(context).Logout();
goLoginScreen();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
//method to go to login screen
private void goLoginScreen() {
Intent intent=new Intent(this,MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}

}

正如你告诉我的，我创建了一个透明活动。我添加了方法handleSignInResult，因为正在调用方法OnActivityResult。

这是代码：

public class GoogleActivity extends AppCompatActivity {
public static final int RC_SIGN_IN = 1000;
private static final String ACTION = "calling_action";
public static Intent getIntent(Context context, int action, Intent actionIntent) {
Intent i = new Intent(context, GoogleActivity.class);
i.putExtra(ACTION, action);
i.putExtra(Intent.EXTRA_INTENT, actionIntent);
return i;
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
Intent actionIntent;
int action = getIntent().getIntExtra(ACTION, 0);
switch (action) {
case RC_SIGN_IN:
actionIntent = (Intent) getIntent().getExtras().get(Intent.EXTRA_INTENT);
if (actionIntent != null)
startActivityForResult(actionIntent, RC_SIGN_IN);
break;
case 0:
default:
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RC_SIGN_IN:
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
handleSignInResult(result);
finish();
return;
}
}
private void handleSignInResult(GoogleSignInResult result)
{
if (result.isSuccess())
{
// Signed in successfully
Log.d("SIGNIN", "YOU ARE LOG IN");

} else
{
// Signed out,
Log.d("SIGNIN", "YOU ARE NOT LOG IN");
}
}

}

我等着你的帮助！

谢谢！

Answer 1

这不是一个坏主意，事实上这是你应该做的。如果要处理来自 Google Auth 的所有操作和事件，最简单、优雅、可重用且可测试的方法是将此逻辑包装在一个或多个专用于此的分支中。

如果你的动作很少，你可以只在一个包装类中计算所有这些动作。例如，可以创建一个类GoogleSingInWrapper并使用Singleton模式来确保整个应用中只有一个实例。

public class GoogleSingInWrapper {
private static GoogleSingInWrapper instance;
private GoogleApiClient mGoogleApiClient;
private GoogleSingainWrapper() {
// Private constructor to deny the creation of this object through the constructor and prevent creating more then one instance
mGoogleApiClient = /*create your client here*/;
}
public static getInstance(/*params you need*/) {
if(instance == null)
instance = new GoogleSingInWrapper (/*params*/);
return instance;
}
public void login(/*params*/) {
// Login
}
// Other methods
}

因此，要获取(如果尚不存在，则创建一个实例(您使用GoogleSingInWrapper的实例：

GoogleSingInWrapper.gerInstance(/*params*/);

现在，如果您将所有变量和逻辑都放在此类中，则可以从所需的位置访问它们。mGoogleApiClient必须在此包装器中。

您现在可以添加所需的所有方法，例如login，logout和revoke。

并按如下方式使用它：

GoogleSingInWrapper.getInstance().login(/*params*/);
GoogleSingInWrapper.getInstance().logout(/*params*/);
GoogleSingInWrapper.getInstance().revoke(/*params*/);

您不应该直接使用mGoogleApiClient，它应该封装在GoogleSingInWrapper中。

编辑

当我说mGoogleApiClient应该在GoogleSingInWrapper内部是私有的时，这意味着你不应该在GoogleSingInWrapper类之外访问它。如果创建GoogleSingInWrapper但创建的方法名为

public GoogleApiClient get_GoogleApiClient();

你的问题一直存在，因为你仍然在所有活动中使用此mGoogleApiClient。您不希望这样做，因此您希望在所有活动中与此对象分离。

在您的编辑之后，我将在此处输入更多代码，但我给您的免费代码越多，您学到的代码就越少。

public class GoogleSingInWrapper {
private static GoogleSingInWrapper instance;
private GoogleApiClient mGoogleApiClient;
private GoogleSingainWrapper(Context context) {
// Private constructor to deny the creation of this object through the constructor and prevent creating more then one instance
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail() 
.build(); 
mGoogleApiClient = new GoogleApiClient.Builder(context)
.enableAutoManage(this, this)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build(); 
}
public static getInstance(Context context) {
if(instance == null)
instance = new GoogleSingInWrapper (/*params*/);
return instance;
}
public void login(/*params*/) {
// Login
}
// Other methods
public void logout(){ 
if(mGoogleApiClient.isConnected()) {
Auth.GoogleSignInApi.signOut(mGoogleApiClient).setResultCallback(
new ResultCallback<Status>() {
@Override 
public void onResult(Status status) {
Log.d("LOGOUT-RESULT","LOGOUT");
} 
}); 
}  
}
}

这应该看起来像你的GoogleSingInWrapper。要调用示例注销方法，您应该按如下方式调用：

if (id == R.id.logout) {
GoogleSingInWrapper.getInstance(context).logout();
goLoginScreen(); 
} 

请注意，构造函数是有意Private的，因为您不想调用new GoogleSingInWrapper。如果你这样做，你就是在创建这个对象的多个实例，你正在破坏Singleton模式。

另外，您可能会注意到某些过程(如登录(需要Activity，因为结果发布在onActivityResult.为了将GoogleSingInWrapper与所有Activities分离，您可以创建一个专用Activity来管理所有onActivityResults。此活动应该是透明的，并且对用户不可见。

您可以使用以下代码实现这一点：

public class GoogleActivity extends AppCompatActivity {
public static final int RC_SIGN_IN = 1000;
private static final String ACTION = "calling_action";
public static Intent getIntent(Context context, int action, Intent actionIntent) {
Intent i = new Intent(context, GoogleActivity.class);
i.putExtra(ACTION, action);
i.putExtra(Intent.EXTRA_INTENT, actionIntent);
return i;
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
Intent actionIntent;
int action = getIntent().getIntExtra(ACTION, 0);
switch (action) {
case RC_SIGN_IN:
actionIntent = (Intent) getIntent().getExtras().get(Intent.EXTRA_INTENT);
if (actionIntent != null)
startActivityForResult(actionIntent, RC_SIGN_IN);
break;
case 0:
default:
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RC_SIGN_IN:
GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
handleSignInResult(result);
finish();
return;
}
}
}

然后在清单中为此Activity设置透明主题：

<activity
android:name=".data.drive.GoogleActivity"
android:theme="@style/TransparentActivity"/>

并在values文件夹中定义透明样式：

<style name="TransparentActivity" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>
<item name="android:windowContentOverlay">@null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>

现在你必须抓住我做过的所有部分并构建你的最终产品，以便让它工作。