java - Android firebase getValue() 不工作

Question

我有以下 JSON 文件

{
    "TestNode" : {
        "TestKey" : "TestValue",
        "TestKeyTwo" : "TestValueTwo"
    },
    "TestNode2" : {
        "One" : {
            "ItemOne" : "email@gmail.com",
            "ItemTwo" : "zYMnPqefn7BlGDidpOocff6Xcg==\nBKb1sfaDdgfe0=\n1yVcV0mciIQXtAf/4LqGdDw==\n",
            "ItemThree" : "name"
        },
        "Two" : {
            "email" : "emailtwo@gmail.com",
            "password" : "xFBvDPcnp/efebUhtefZ0+XMFfw==\ngAb5fSbzAefeQXc=\ng/WdCpusQl2umtPVOefefzjs1A==\n",
            "username" : "othername"
        }
    }
}

监听器代码

TestNode.addListenerForSingleValueEvent(new ValueEventListener() {

    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {

        if(dataSnapshot.hasChild(TestKey)) {
            String TestKeyString = TestNode.child(TestKey).getKey();
            String TestValueString = TestNode.child(TestKey).getValue();
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {}
});

我收到错误

Cant resolve method getValue();

P.S 由于上述错误，我还没有运行代码

Answer 1

试试这个代码:

 TestNode.addListenerForSingleValueEvent(new ValueEventListener() {

 @Override
 public void onDataChange(DataSnapshot dataSnapshot) {
    Log.d("TEST","key: "+dataSnapshot.getKey());
    Log.d("TEST","value: "+dataSnapshot.getValue());
 }

 @Override
 public void onCancelled(DatabaseError databaseError) {}
 });

更新
尝试使用此代码只获取一个 child

 TestNode.orderByKey().equalTo(TestKey).addListenerForSingleValueEvent(new ValueEventListener() {

 @Override
 public void onDataChange(DataSnapshot dataSnapshot) {
    Log.d("TEST","key: "+dataSnapshot.getKey());
    Log.d("TEST","value: "+dataSnapshot.getValue());
 }

 @Override
 public void onCancelled(DatabaseError databaseError) {}
 });