Android:将google drive集成到应用程序中

dependencies {
    implementation 'com.google.android.gms:play-services-drive:17.0.0'
}

import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.drive.Drive;

public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private GoogleApiClient googleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        googleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addScope(Drive.SCOPE_FILE)
                .build();
    }

    @Override
    protected void onStart() {
        super.onStart();
        googleApiClient.connect();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (googleApiClient.isConnected()) {
            googleApiClient.disconnect();
        }
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        // 连接成功后的操作
    }

    @Override
    public void onConnectionSuspended(int cause) {
        // 连接暂停后的操作
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        // 连接失败后的操作
    }
}

import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;

public class MainActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 9001;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestScopes(Drive.SCOPE_FILE)
                .build();

        GoogleSignInClient googleSignInClient = GoogleSignIn.getClient(this, gso);

        Intent signInIntent = googleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

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

        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);
            // 登录成功后的操作
        } catch (ApiException e) {
            // 登录失败后的操作
        }
    }
}

import com.google.android.gms.drive.Drive;
import com.google.android.gms.drive.query.Query;
import com.google.android.gms.drive.query.Filters;
import com.google.android.gms.drive.query.SortOrder;

public void listFiles() {
    Query query = new Query.Builder()
            .addFilter(Filters.eq(SearchableField.TITLE, "filename"))
            .build();

    DriveResourceClient driveResourceClient = Drive.getDriveResourceClient(this, GoogleSignIn.getLastSignedInAccount(this));
    driveResourceClient.query(query).addOnSuccessListener(files -> {
        for (DriveFile file : files.getDriveFiles()) {
            // 处理文件
        }
    }).addOnFailureListener(e -> {
        // 处理错误
    });
}