Question

我是Content Provider的新手。因为我正在尝试从应用程序获取信息到另一个应用程序，但我得到了拒绝权限：打开提供程序错误。我尝试通过在我的某个应用程序（App1）中创建内容提供程序来实现此目的：

public class DroneProvider extends ContentProvider {
    private static final String AUTHORITY = "com.x.x.adminapp";
    private static final String BASE_PATH = "Drone";
    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH );

    private static final int DRONE = 1;
    private static final int DRONE_NAME = 2;

    private static final UriMatcher uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    static {
        uriMatcher.addURI(AUTHORITY,BASE_PATH, DRONE);
        uriMatcher.addURI(AUTHORITY,BASE_PATH + "/#",DRONE_NAME);
    }

我的Provider类中的查询函数是：

@Nullable
@Override
public Cursor query(Uri uri, String[] strings, String s, String[] strings1, String s1) {
    Cursor cursor;
    switch (uriMatcher.match(uri)) {
        case DRONE:
            cursor =  database.query(MyDBHandler.TABLED_NAME,MyDBHandler.ALL_DRONE_COLUMNS,
                    s,null,null,null,MyDBHandler.COLUMN_DNAME +" ASC");
            break;
        default:
            throw new IllegalArgumentException("This is an Unknown URI " + uri);
    }
    cursor.setNotificationUri(getContext().getContentResolver(),uri);

    return cursor;
}

我在Manifest中添加了权限：

<provider
            android:name=".DroneProvider"
            android:authorities="com.x.x.adminapp"
            android:readPermission="com.x.x.adminapp.READ_DATABASE"
            android:writePermission="com.x.x.adminapp.WRITE_DATABASE"
            android:enabled="true"
            android:exported="true"></provider>

在我的其他应用程序（App2）中，我在我的活动中使用解析程序从（App1）中获取数据，如下所示：

    private static final String AUTHORITY = "com.x.x.adminapp";
    private static final String BASE_PATH = "Drone";
    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH );

    private static final int DRONE = 1;
    private static final int DRONE_NAME = 2;

    private static final UriMatcher uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    static {
        uriMatcher.addURI(AUTHORITY,BASE_PATH, DRONE);
        uriMatcher.addURI(AUTHORITY,BASE_PATH + "/#",DRONE_NAME);
    }
 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

 ContentResolver contentResolver = getContext().getContentResolver();
                String sortOrder = "name ASC";
                Cursor cursor = contentResolver.query(CONTENT_URI,null,null,null,sortOrder);
                if (cursor!= null && cursor.getCount()>0){
                    cursor.moveToFirst();
                    Drone drone ;
                    Marker m;
                    LatLng latLng;
                    do {
                        drone = new Drone();
                        drone.setName(cursor.getString(0));
                        latLng = new LatLng(0.0,0.0);
                        m = googleMap.addMarker(new MarkerOptions().position(latLng).title(drone.getName()));
                        Drones.add(m);

                    }
                    while (cursor.moveToNext());
                }

我在App2 Manifest中添加了权限：

<uses-permission android:name="com.x.x.adminapp.READ_DATABASE" />
<uses-permission android:name="com.x.x.adminapp.WRITE_DATABASE" />

但我得到了这个错误：

java.lang.SecurityException：Permission Denial：打开提供者 com.x.x.adminapp.DroneProvider来自 ProcessRecord {46a1928 24678：com.x.x.myapplication11 / u0a165}（pid = 24678， uid = 10165）需要com.x.x.adminapp.READ_DATABASE或 com.x.x.adminapp.WRITE_DATABASE

提前感谢您的帮助：）

Answer 1

您需要定义任何自定义权限：

https://developer.android.com/guide/topics/permissions/defining.html

<permission
  android:name="com.x.x.adminapp.WRITE_DATABASE"
  android:label="Write Database"
  android:description="Write to my database."
  android:protectionLevel="normal" />

<permission
  android:name="com.x.x.adminapp.READ_DATABASE"
  android:label="Read Database"
  android:description="Read from my database."
  android:protectionLevel="normal" />

注意保护级别＆＃34;正常＆＃34;这意味着任何应用程序都可以请求并被授予该权限。我建议你把它改成＆＃34;签名＆＃34;因此，只有您的应用可以被授予权限。不言而喻，两个应用程序都需要使用相同的密钥进行签名。：）

权限拒绝：打开提供商Android Studio

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