小编tin*_*tin的帖子

我想检查Firebase数据库中是否已存在总线编号.

这是我的示例代码.我一直在寻找过去的日子,但我找不到合适的代码.

ref = new Firebase(Config.FIREBASE_URL);
            postRef = ref.child("BusNumber");

            busNum = edtBus.getText().toString().trim();
            route1 = route.trim();
            seat = edtSeat.getText().toString().trim();

            if (!busNum.isEmpty() && !route1.isEmpty() && !seat.isEmpty()) {
                postRef.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        if (dataSnapshot.child(busNum).exists()) {
                            edtBus.setError("Bus number already exists.");
                            edtBus.setText("");
                        } else {
                            busNumber = new BusNumber();
                            busNumber.setBusNum(busNum);
                            busNumber.setRoute(route1);
                            busNumber.setNumSeat(seat);
                            postRef.push().setValue(busNumber);
                            edtBus.setText("");
                            edtSeat.setText("");
                            Toast.makeText(AddBusActivity.this, "Saving successful!", Toast.LENGTH_SHORT).show();
                        }
                    }

                    @Override
                    public void onCancelled(FirebaseError firebaseError) {
                        Toast.makeText(AddBusActivity.this, "Error", Toast.LENGTH_SHORT).show();
                        Toast.makeText(AddBusActivity.this, firebaseError.getMessage(), Toast.LENGTH_SHORT).show();
                    }
                });

            } else {
                Toast.makeText(AddBusActivity.this, "Please …

插件太旧了,请更新到更新版本,或将ANDROID_DAILY_OVERRIDE环境变量设置为"aed79d567e57792ed352e708d2b7ca891ff897c6"有人可以帮帮我吗？我怎么能更新这个

apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion '23.0.2'

defaultConfig {
    applicationId "xxxxxx.xxxx.xxx"
    minSdkVersion 16
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}}   dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
testCompile 'junit:junit:4.12'
compile files('libs/Parse-1.10.2.jar')
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'com.parse.bolts:bolts-android:1.+'
compile 'com.android.support:support-v4:23.1.1'
compile 'com.google.android.gms:play-services:8.1.0'}'

我正在使用插件 'com.android.tools.build:gradle:2.0.0-alpha3'

你有什么想法可能是什么原因？

我希望我String[] array;保持静止,但我仍然不知道它的大小.

有没有办法声明未知大小的字符串数组？我尽可能不想使用ArrayList

我从Firebase获取假定的数据之后获取数据,我将其存储在一个ArrayList.所以这是示例代码.

markerArray = new ArrayList<>();
Firebase ref = new Firebase(Config.FIREBASE_URL_DRIVER);
ref.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        if (dataSnapshot.getChildrenCount() == 0) {
            markerInfo();
        } else {
            for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
                name = snapshot.child("driversName").getValue().toString().trim();
                busNum = snapshot.child("busNum").getValue().toString().trim();
                latitude = Double.valueOf(snapshot.child("latitude").getValue().toString().trim());
                longitude = Double.valueOf(snapshot.child("longitude").getValue().toString().trim());
                availableSeat = snapshot.child("availableSeat").getValue().toString().trim();
                estimatedTime = snapshot.child("estimatedTime").getValue().toString().trim();
                if ((!latitude.equals(null) || latitude.equals(0)) && (!longitude.equals(null) || longitude.equals(0)) && availableSeat.equals("") && (!estimatedTime.equals("") || estimatedTime.equals("0"))) {
                    convertLatLong();
                    getTotalPass();
                    Toast.makeText(MainMapActivity.this, currentLocation+" :currentLocation", Toast.LENGTH_SHORT).show();
                    markerArray.add(new Driver(name, totalPassenger, …