java - 如何以编程方式在你的安卓应用程序中打开谷歌教室

Question

我想通过我现有的应用程序打开谷歌类应用程序。为此，我在抽屉导航中添加了一个按钮。我为此使用了 google classroom API，但它只显示我注册的教室的名称。我想通过我的打开整个应用程序。我也尝试过 intent 但没有用。请告诉我我必须做什么？

        Code:

       package com.example.mi.mikpiadmin;
       import com.google.android.gms.common.ConnectionResult;
        import com.google.android.gms.common.GoogleApiAvailability;
        import com.google.api.client.extensions.android.http.AndroidHttp;
        import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential;
        import com.google.api.client.googleapis.extensions.android.gms.auth.GooglePlayServicesAvailabilityIOException;
        import com.google.api.client.googleapis.extensions.android.gms.auth.UserRecoverableAuthIOException;

        import com.google.api.client.http.HttpTransport;
        import com.google.api.client.json.JsonFactory;
        import com.google.api.client.json.jackson2.JacksonFactory;
        import com.google.api.client.util.ExponentialBackOff;

        import com.google.api.services.classroom.ClassroomScopes;

        import com.google.api.services.classroom.model.*;

        import android.Manifest;
        import android.accounts.AccountManager;
        import android.app.Activity;
        import android.app.Dialog;
        import android.app.ProgressDialog;
        import android.content.Context;
        import android.content.Intent;
        import android.content.SharedPreferences;
        import android.content.pm.PackageManager;
        import android.net.ConnectivityManager;
        import android.net.NetworkInfo;
        import android.os.AsyncTask;
        import android.os.Bundle;
        import android.support.annotation.NonNull;
        import android.text.TextUtils;
        import android.text.method.ScrollingMovementMethod;
        import android.view.View;
        import android.view.ViewGroup;
        import android.widget.Button;
        import android.widget.LinearLayout;
        import android.widget.TextView;

        import java.io.IOException;
        import java.util.ArrayList;
        import java.util.Arrays;
        import java.util.List;

        import pub.devrel.easypermissions.AfterPermissionGranted;
        import pub.devrel.easypermissions.EasyPermissions;

public class Google_Classroom extends Activity
        implements EasyPermissions.PermissionCallbacks {
    GoogleAccountCredential mCredential;
    private TextView mOutputText;
    private Button mCallApiButton;
    ProgressDialog mProgress;

    static final int REQUEST_ACCOUNT_PICKER = 1000;
    static final int REQUEST_AUTHORIZATION = 1001;
    static final int REQUEST_GOOGLE_PLAY_SERVICES = 1002;
    static final int REQUEST_PERMISSION_GET_ACCOUNTS = 1003;

    private static final String BUTTON_TEXT = "Call Classroom API";
    private static final String PREF_ACCOUNT_NAME = "accountName";
    private static final String[] SCOPES = { ClassroomScopes.CLASSROOM_COURSEWORK_STUDENTS };

    /**
     * Create the main activity.
     * @param savedInstanceState previously saved instance data.
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout activityLayout = new LinearLayout(this);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT);
        activityLayout.setLayoutParams(lp);
        activityLayout.setOrientation(LinearLayout.VERTICAL);
        activityLayout.setPadding(16, 16, 16, 16);

        ViewGroup.LayoutParams tlp = new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);

        mCallApiButton = new Button(this);
        mCallApiButton.setText(BUTTON_TEXT);
        mCallApiButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i;
                PackageManager manager = getPackageManager();
                try {
                    i = manager.getLaunchIntentForPackage("com.google.api.services.classroom");
                    if (i == null)
                        throw new PackageManager.NameNotFoundException();
                    i.addCategory(Intent.CATEGORY_LAUNCHER);
                    startActivity(i);
                } catch (PackageManager.NameNotFoundException e) {

                }
                mCallApiButton.setEnabled(false);
                mOutputText.setText("");
                getResultsFromApi();
                mCallApiButton.setEnabled(true);
            }
        });
        activityLayout.addView(mCallApiButton);

        mOutputText = new TextView(this);
        mOutputText.setLayoutParams(tlp);
        mOutputText.setPadding(16, 16, 16, 16);
        mOutputText.setVerticalScrollBarEnabled(true);
        mOutputText.setMovementMethod(new ScrollingMovementMethod());
        mOutputText.setText(
                "Click the \'" + BUTTON_TEXT +"\' button to test the API.");
        activityLayout.addView(mOutputText);

        mProgress = new ProgressDialog(this);
        mProgress.setMessage("Calling Classroom API ...");

        setContentView(activityLayout);

        // Initialize credentials and service object.
        mCredential = GoogleAccountCredential.usingOAuth2(
                getApplicationContext(), Arrays.asList(SCOPES))
                .setBackOff(new ExponentialBackOff());
    }



    /**
     * Attempt to call the API, after verifying that all the preconditions are
     * satisfied. The preconditions are: Google Play Services installed, an
     * account was selected and the device currently has online access. If any
     * of the preconditions are not satisfied, the app will prompt the user as
     * appropriate.
     */
    private void getResultsFromApi() {
        if (! isGooglePlayServicesAvailable()) {
            acquireGooglePlayServices();
        } else if (mCredential.getSelectedAccountName() == null) {
            chooseAccount();
        } else if (! isDeviceOnline()) {
            mOutputText.setText("No network connection available.");
        } else {
            new MakeRequestTask(mCredential).execute();
        }
    }

    /**
     * Attempts to set the account used with the API credentials. If an account
     * name was previously saved it will use that one; otherwise an account
     * picker dialog will be shown to the user. Note that the setting the
     * account to use with the credentials object requires the app to have the
     * GET_ACCOUNTS permission, which is requested here if it is not already
     * present. The AfterPermissionGranted annotation indicates that this
     * function will be rerun automatically whenever the GET_ACCOUNTS permission
     * is granted.
     */
    @AfterPermissionGranted(REQUEST_PERMISSION_GET_ACCOUNTS)
    private void chooseAccount() {
        if (EasyPermissions.hasPermissions(
                this, Manifest.permission.GET_ACCOUNTS)) {
            String accountName = getPreferences(Context.MODE_PRIVATE)
                    .getString(PREF_ACCOUNT_NAME, null);
            if (accountName != null) {
                mCredential.setSelectedAccountName(accountName);
                getResultsFromApi();
            } else {
                // Start a dialog from which the user can choose an account
                startActivityForResult(
                        mCredential.newChooseAccountIntent(),
                        REQUEST_ACCOUNT_PICKER);
            }
        } else {
            // Request the GET_ACCOUNTS permission via a user dialog
            EasyPermissions.requestPermissions(
                    this,
                    "This app needs to access your Google account (via Contacts).",
                    REQUEST_PERMISSION_GET_ACCOUNTS,
                    Manifest.permission.GET_ACCOUNTS);
        }
    }

    /**
     * Called when an activity launched here (specifically, AccountPicker
     * and authorization) exits, giving you the requestCode you started it with,
     * the resultCode it returned, and any additional data from it.
     * @param requestCode code indicating which activity result is incoming.
     * @param resultCode code indicating the result of the incoming
     *     activity result.
     * @param data Intent (containing result data) returned by incoming
     *     activity result.
     */
    @Override
    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode) {
            case REQUEST_GOOGLE_PLAY_SERVICES:
                if (resultCode != RESULT_OK) {
                    mOutputText.setText(
                            "This app requires Google Play Services. Please install " +
                                    "Google Play Services on your device and relaunch this app.");
                } else {
                    getResultsFromApi();
                }
                break;
            case REQUEST_ACCOUNT_PICKER:
                if (resultCode == RESULT_OK && data != null &&
                        data.getExtras() != null) {
                    String accountName =
                            data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
                    if (accountName != null) {
                        SharedPreferences settings =
                                getPreferences(Context.MODE_PRIVATE);
                        SharedPreferences.Editor editor = settings.edit();
                        editor.putString(PREF_ACCOUNT_NAME, accountName);
                        editor.apply();
                        mCredential.setSelectedAccountName(accountName);
                        getResultsFromApi();
                    }
                }
                break;
            case REQUEST_AUTHORIZATION:
                if (resultCode == RESULT_OK) {
                    getResultsFromApi();
                }
                break;
        }
    }

    /**
     * Respond to requests for permissions at runtime for API 23 and above.
     * @param requestCode The request code passed in
     *     requestPermissions(android.app.Activity, String, int, String[])
     * @param permissions The requested permissions. Never null.
     * @param grantResults The grant results for the corresponding permissions
     *     which is either PERMISSION_GRANTED or PERMISSION_DENIED. Never null.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        EasyPermissions.onRequestPermissionsResult(
                requestCode, permissions, grantResults, this);
    }

    /**
     * Callback for when a permission is granted using the EasyPermissions
     * library.
     * @param requestCode The request code associated with the requested
     *         permission
     * @param list The requested permission list. Never null.
     */
    @Override
    public void onPermissionsGranted(int requestCode, List<String> list) {
        // Do nothing.
    }

    /**
     * Callback for when a permission is denied using the EasyPermissions
     * library.
     * @param requestCode The request code associated with the requested
     *         permission
     * @param list The requested permission list. Never null.
     */
    @Override
    public void onPermissionsDenied(int requestCode, List<String> list) {
        // Do nothing.
    }

    /**
     * Checks whether the device currently has a network connection.
     * @return true if the device has a network connection, false otherwise.
     */
    private boolean isDeviceOnline() {
        ConnectivityManager connMgr =
                (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
        return (networkInfo != null && networkInfo.isConnected());
    }

    /**
     * Check that Google Play services APK is installed and up to date.
     * @return true if Google Play Services is available and up to
     *     date on this device; false otherwise.
     */
    private boolean isGooglePlayServicesAvailable() {
        GoogleApiAvailability apiAvailability =
                GoogleApiAvailability.getInstance();
        final int connectionStatusCode =
                apiAvailability.isGooglePlayServicesAvailable(this);
        return connectionStatusCode == ConnectionResult.SUCCESS;
    }

    /**
     * Attempt to resolve a missing, out-of-date, invalid or disabled Google
     * Play Services installation via a user dialog, if possible.
     */
    private void acquireGooglePlayServices() {
        GoogleApiAvailability apiAvailability =
                GoogleApiAvailability.getInstance();
        final int connectionStatusCode =
                apiAvailability.isGooglePlayServicesAvailable(this);
        if (apiAvailability.isUserResolvableError(connectionStatusCode)) {
            showGooglePlayServicesAvailabilityErrorDialog(connectionStatusCode);
        }
    }


    /**
     * Display an error dialog showing that Google Play Services is missing
     * or out of date.
     * @param connectionStatusCode code describing the presence (or lack of)
     *     Google Play Services on this device.
     */
    void showGooglePlayServicesAvailabilityErrorDialog(
            final int connectionStatusCode) {
        GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
        Dialog dialog = apiAvailability.getErrorDialog(
                Google_Classroom.this,
                connectionStatusCode,
                REQUEST_GOOGLE_PLAY_SERVICES);
        dialog.show();
    }

    /**
     * An asynchronous task that handles the Classroom API call.
     * Placing the API calls in their own task ensures the UI stays responsive.
     */
    private class MakeRequestTask extends AsyncTask<Void, Void, List<String>> {
        private com.google.api.services.classroom.Classroom mService = null;
        private Exception mLastError = null;

        MakeRequestTask(GoogleAccountCredential credential) {
            HttpTransport transport = AndroidHttp.newCompatibleTransport();
            JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
            mService = new com.google.api.services.classroom.Classroom.Builder(
                    transport, jsonFactory, credential)
                    .setApplicationName("Classroom API Android Quickstart")
                    .build();
        }

        /**
         * Background task to call Classroom API.
         * @param params no parameters needed for this task.
         */
        @Override
        protected List<String> doInBackground(Void... params) {
            try {
                return getDataFromApi();
            } catch (Exception e) {
                mLastError = e;
                cancel(true);
                return null;
            }
        }

        /**
         * Fetch a list of the names of the first 10 courses the user has access to.
         * @return List course names, or a simple error message if no courses are
         *         found.
         * @throws IOException
         */
        private List<String> getDataFromApi() throws IOException {
            ListCoursesResponse response = mService.courses().list()
                    .setPageSize(10)
                    .execute();
            List<Course> courses = response.getCourses();
            List<String> names = new ArrayList<String>();
            if (courses != null) {
                for (Course course : courses) {
                    names.add(course.getName());
                }
            }
            return names;
        }


        @Override
        protected void onPreExecute() {
            mOutputText.setText("");
            mProgress.show();
        }

        @Override
        protected void onPostExecute(List<String> output) {
            mProgress.hide();
            if (output == null || output.size() == 0) {
                mOutputText.setText("No results returned.");
            } else {
                output.add(0, "Data retrieved using the Classroom API:");
                mOutputText.setText(TextUtils.join("\n", output));
            }
        }

        @Override
        protected void onCancelled() {
            mProgress.hide();
            if (mLastError != null) {
                if (mLastError instanceof GooglePlayServicesAvailabilityIOException) {
                    showGooglePlayServicesAvailabilityErrorDialog(
                            ((GooglePlayServicesAvailabilityIOException) mLastError)
                                    .getConnectionStatusCode());
                } else if (mLastError instanceof UserRecoverableAuthIOException) {
                    startActivityForResult(
                            ((UserRecoverableAuthIOException) mLastError).getIntent(),
                            Google_Classroom.REQUEST_AUTHORIZATION);
                } else {
                    mOutputText.setText("The following error occurred:\n"
                            + mLastError.getMessage());
                }
            } else {
                mOutputText.setText("Request cancelled.");
            }
        }
    }
}

Gradle file:
apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "com.example.mi.mikpiadmin"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:cardview-v7:25.3.1'
    compile 'com.android.volley:volley:1.0.0'
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:design:25.3.1'
    compile 'net.gotev:uploadservice:2.1'
    compile 'com.google.android.gms:play-services-auth:11.4.0'
    compile 'pub.devrel:easypermissions:0.3.0'

        testCompile 'junit:junit:4.12'
    compile('com.google.api-client:google-api-client-android:1.22.0') {
        exclude group: 'org.apache.httpcomponents'
    }
    compile('com.google.apis:google-api-services-classroom:v1-rev64-1.22.0') {
        exclude group: 'org.apache.httpcomponents'
    }
    android {
        configurations.all {
            resolutionStrategy.force 'com.google.code.findbugs:jsr305:1.3.9'
        }
    }
}

Answer 1

首先，您必须在您的 android 中安装了 google classroom 应用程序，然后尝试以下代码 fragment :

Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.google.android.apps.classroom");
if (launchIntent != null) { 
    startActivity(launchIntent);//null pointer check in case package name was not found
}