mDatabase.child("KhCm8DZpg72BBXCISCC").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Product product = dataSnapshot.getValue(Product.class);
s="Product Name: "+product.getName();
textView.setText(s);
}
@Override
public void onCancelled(DatabaseError error) {
}
});
这是我用来检索的代码
04-09 09:57:42.501 9450-9450 /? E / FirebaseApp:Firebase API初始化失败 . 来自com.google.firebase.FirebaseApp.initializeApp(未知来源)的com.google.firebase.FirebaseApp.zza(未知来源)的java.lang.reflect.Method.invoke(本地方法)中的java.lang.reflect.InvocationTargetException com.google.firebase.FirebaseApp.initializeApp(未知来源)位于com.google.firebase.FirebaseApp.initializeApp(未知来源)com.google.firebase.provider.FirebaseInitProvider.onCreate(未知来源)位于android.content.ContentProvider . attachInfo(ContentProvider.java:1748)位于android.app.A活动时,com.google.firest.provider.FirebaseInitProvider.attachInfo(未知来源)的android.content.ContentProvider.attachInfo(ContentProvider.java:1723)处于android.app.ActivityThread.installProvider(ActivityThread . java:5153)在android.app.ActivityThread.installContentProviders(ActivityThread.java:4748)android.app.ActivityThread.handleBindApplication(ActivityThread.java:4688)android.app.ActivityThread.-wrap1(ActivityThread.java)at android .app.ActivityThread $ H.handleMessage(ActivityThread.jav a:1405)在Android.os.Handler.dispatchMessage(Handler.java:102)的android.app.Looper.loop(Looper.java:148)android.app.ActivityThread.main(ActivityThread.java:5417)at at java.lang.reflect.Method.invoke(Native Method)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:726)com.android.internal.os.ZygoteInit.main(ZygoteInit.java) :616)引起:java.lang.NoSuchMethodError:没有静态方法zzy(Ljava / lang / Object;)Ljava / lang / Object;在课堂Lcom / google / android / gms / common / internal / zzaa;或其超级类('com.google.android.gms.common.internal.zzaa'的声明出现在com中的/data/app/com.example.android.supermarket-1/split_lib_dependencies_apk.apk:classes15.dex) . 来自java.lang.reflect.Method.invoke(Native Method)的com.google.android.gms.measurement.AppMeasurement.getInstance(未知来源)的google.android.gms.measurement.internal.zzx.zzdq(未知来源)at com.google.firebase.FirebaseApp上的com.google.firebase.FirebaseApp.initializeApp(未知来源)中的com.google.firebase.FirebaseApp.zza(未知来源),位于com.google.fire.FirebaseApp上的com.google.firebase.FirebaseApp.initializeApp(未知来源) . 在android.content.ContentProvider.attachInfo(ContentProvider.java:1723)的android.content.ContentProvider.attachInfo(ContentProvider.java:1748)的com.google.firebase.provider.FirebaseInitProvider.onCreate(未知来源)初始化App(未知来源) )在android.app.ActivityThread.installProvider(ActivityThrea)的com.google.firebase.provider.FirebaseInitProvider.attachInfo(未知来源) d.java:5153)在Android.app.ActivityThread.handle上的android.app.ActivityThread.installContentProviders(ActivityThread.java:4748)android.app.ActivityThread.-wrap1(ActivityThread.java)的android.app.ActivityThread.handleBindApplication(ActivityThread.java:4688)在android.app.A.运行时android.O.Roper.loop(Looper.java:148)上的android.app.A活动线程中的android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1405)处于Android.os.Handler.dispatchMessage(Handler.java:102) . app.ActivityThread.main(ActivityThread.java:5417)位于com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:726)的java.lang.reflect.Method.invoke(Native Method)中 . android.internal.os.ZygoteInit.main(ZygoteInit.java:616)这个错误即将获得`apply plugin:'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.example.android.supermarket"
minSdkVersion 19
targetSdkVersion 23
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso- core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:design:23.4.0'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:support-v4:23.4.0'
compile 'com.google.android.gms:play-services-appindexing:9.8.0'
compile 'com.google.firebase:firebase-auth:10.0.1'
compile 'com.google.firebase:firebase-database:10.0.1'
testCompile 'junit:junit:4.12'
}
申请插件:'com.google.gms.google-services'
2 回答
现在这将覆盖TextView中的文本 . 您可以将所有产品名称存储在一个数组中,然后稍后使用它,或者您可以以编程方式创建文本视图,也可以使用RecyclerView来填充数据 .