适用于Android的Google API客户端-如何申请帐户？

Question

在我的应用程序中，我为用户提供了一个选项，可以将其数据（一个db和一些音频文件）备份到应用程序文件夹中的Google Drive帐户。为此，用户必须在以下对话框中“为MyApp选择帐户”：

mGAPIClient = new GoogleApiClient.Builder(mACA)
                .enableAutoManage(mACA, this)
                .addApi(Drive.API)
                .addScope(Drive.SCOPE_APPFOLDER)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();

之后，我开始备份过程。

但是，如果用户点击该对话框之外的某个地方，它会消失并且不会建立连接-并且不会再次显示该对话框。

发生这种情况时，我如何提示系统再次向他/她显示该对话框？除此之外，我还尝试将GoogleAppClient实例设置为null并再次构建它，但没有成功。

Answer 1

我使用了官方博客文章中建议的最新GoogleApi客户端，并且使用了AGP 3.0.1和Gradle 4.2.1。

>

将此类路径添加到项目生成中。渐变依赖项

classpath 'com.google.gms:google-services:3.1.2'

将这些依赖项添加到应用程序构建。格拉德尔

implementation 'com.google.android.gms:play-services-auth:11.6.2'
implementation 'com.google.android.gms:play-services-drive:11.6.2'

在应用程序build.gradle文件的底部添加插件行

apply plugin: 'com.google.gms.google-services'

在我的示例中，我有：

public class MainActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 9001;

    private GoogleSignInClient mSignInClient;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //request access to drive
        GoogleSignInOptions options =
                new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                        .requestScopes(Drive.SCOPE_FILE)
                        .build();

        mSignInClient = GoogleSignIn.getClient(this, options);
        //button to launch the signIn flow
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(view -> signIn());
    }

    private void signIn() {
        // Launches the sign in flow, the result is returned in onActivityResult
        Intent intent = mSignInClient.getSignInIntent();
        startActivityForResult(intent, RC_SIGN_IN);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task =
                    GoogleSignIn.getSignedInAccountFromIntent(data);
            if (task.isSuccessful()) {
                // Sign in succeeded, proceed with account
                GoogleSignInAccount acct = task.getResult();
                // proceed with your logic
            } else {
                // Sign in failed, handle failure and update UI
                // we should probably show a motivation screen to the user before showing
                // the account selection again, but for example purposes we launch the
                // sign-in flow immediately
                signIn();
            }
        }
    }
}

对我来说，这很有效。如果对你也有效，请告诉我。