Reaml報錯java.lang.IllegalArgumentException:Realm directory is not writable

java.lang.IllegalArgumentException:Realm directory is not writable: /data/user/0/pkg/files.

 

應用內代碼：

Realm.init(this);
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()        
                .directory(realmDir)        
                .name("DataCenter.realm")        
                .deleteRealmIfMigrationNeeded()        
                .schemaVersion(11)        
                .migration(new McMigration())        
                .build();
Realm.setDefaultConfiguration(realmConfiguration);

 

源碼：

public Builder directory(File directory) {    
    //noinspection ConstantConditions    
    if (directory == null) {        
        throw new IllegalArgumentException("Non-null 'dir' required.");    
    }    
    if (directory.isFile()) {        
        throw new IllegalArgumentException("'dir' is a file, not a directory: " +                       directory.getAbsolutePath() + ".");    
    }    
    if (!directory.exists() && !directory.mkdirs()) {        
        throw new IllegalArgumentException("Could not create the specified directory: " +               directory.getAbsolutePath() + ".");    
    }    
    if (!directory.canWrite()) {        
        throw new IllegalArgumentException("Realm directory is not writable: " +                        directory.getAbsolutePath() + ".");    
    }    
    this.directory = directory;    
    return this;
}

修復：

if (!realmDir.canWrite()){    
    realmDir = getExternalFilesDir("realm");
}
// 初始化 Realm
Realm.init(this);
assert realmDir != null;
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder()        
                .directory(realmDir)        
                .name("DataCenter.realm")        
                .deleteRealmIfMigrationNeeded()        
                .schemaVersion(11)        
                .migration(new McMigration())        
                .build();
Realm.setDefaultConfiguration(realmConfiguration);