在android中以编程方式读取日历事件，并在列表视图或滚动视图中显示

Question

我目前正在开发一个应用程序，它允许我访问日历信息，如事件，提醒，邀请等，假设用户授予权限。我已经阅读了谷歌开发人员的文档，但无法理解我如何获取和阅读这些事件或提醒。我想在屏幕上显示所有者帐户中的所有数据，只是为了检查是否所有数据都可用。我这样做只是为了我的理解而没有别的。下面是我通过开发人员网站编写的代码，并以我认为正确的方式编译。

import android.Manifest;
import android.content.ContentResolver;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.CalendarContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public static final int PERMS_REQUEST_CODE = 1;

    TextView displayLabel;

    // Projection array. Creating indices for this array instead of doing
// dynamic lookups improves performance.
    public static final String[] EVENT_PROJECTION = new String[]{
            CalendarContract.Calendars._ID,                           // 0
            CalendarContract.Calendars.ACCOUNT_NAME,                  // 1
            CalendarContract.Calendars.CALENDAR_DISPLAY_NAME,         // 2
            CalendarContract.Calendars.OWNER_ACCOUNT                  // 3
    };

    // The indices for the projection array above.
    private static final int PROJECTION_ID_INDEX = 0;
    private static final int PROJECTION_ACCOUNT_NAME_INDEX = 1;
    private static final int PROJECTION_DISPLAY_NAME_INDEX = 2;
    private static final int PROJECTION_OWNER_ACCOUNT_INDEX = 3;

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

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.READ_CALENDAR)) {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_CALENDAR}, PERMS_REQUEST_CODE);
            } else {
                ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_CALENDAR}, PERMS_REQUEST_CODE);
            }
        } else {

            // Run query
            Cursor cur;
            ContentResolver cr = getContentResolver();
            Uri uri = CalendarContract.Calendars.CONTENT_URI;
            String selection = "((" + CalendarContract.Calendars.ACCOUNT_NAME + " = ?) AND ("
                    + CalendarContract.Calendars.ACCOUNT_TYPE + " = ?) AND ("
                    + CalendarContract.Calendars.OWNER_ACCOUNT + " = ?))";
            String[] selectionArgs = new String[]{"hera@example.com", "com.example",
                    "hera@example.com"};
// Submit the query and get a Cursor object back.
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            cur = cr.query(uri, EVENT_PROJECTION, selection, selectionArgs, null);

            // Use the cursor to step through the returned records
            while (cur.moveToNext()) {
                long calID = 0;
                String displayName = null;
                String accountName = null;
                String ownerName = null;

                // Get the field values
                calID = cur.getLong(PROJECTION_ID_INDEX);
                displayName = cur.getString(PROJECTION_DISPLAY_NAME_INDEX);
                accountName = cur.getString(PROJECTION_ACCOUNT_NAME_INDEX);
                ownerName = cur.getString(PROJECTION_OWNER_ACCOUNT_INDEX);

                // Do something with the values...

                displayLabel = (TextView) findViewById(R.id.displayLabel);
                displayLabel.setText(displayName);

            }
        }
    }
}

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