Android Oreo(> 25)不再鼓励后台服务.即使应用程序关闭,我希望套接字在聊天应用程序中保持连接状态.如何实现对android 26的新更改?
有人说,使用JobIntentService
有人说,使用JobService
有人说,使用JobScheduler
有人说,开始服务作为前台服务
任何帮助,将不胜感激.
这是我的自定义列表适配器,如何使用编辑文本在自定义列表适配器中实现搜索功能。我尝试了很多方法来实现搜索功能
public class ListAdapter extends BaseAdapter {
public ArrayList<Users> listDataContainers = new ArrayList<>();
ListAdapter(ArrayList<Users> listDataContainers) {
this.listDataContainers = listDataContainers;
}
@Override
public int getCount() {
return listDataContainers.size();
}
@Override
public User getItem(int arg0) {
return listDataContainers.get(arg0);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int pos, View arg1, ViewGroup arg2) {
if (arg1 == null) {
LayoutInflater inflater = (LayoutInflater) getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
arg1 = inflater.inflate(R.layout.listitem_layout, arg2, false);
}
TextView pa_name = (TextView) arg1.findViewById(R.id.textName);
TextView pa_date = …Run Code Online (Sandbox Code Playgroud) 我正在尝试使用android studio进行基本的ndk实现.现在我无法同步gradle我认为buid.gradle错过了一些配置
我收到这个错误
错误:无法加载类'com.android.build.gradle.managed.BuildType_Impl'.此意外错误的可能原因包括:
我的buid.gradle(app)
apply plugin: 'com.android.model.application'
model
{
android {
compileSdkVersion = 23
buildToolsVersion = "23.0.1"
defaultConfig.with {
applicationId = "com.example.app"
minSdkVersion.apiLevel = 9
targetSdkVersion.apiLevel = 23
versionCode = 1
versionName = "1.0"
}
}
android.buildTypes {
release {
minifyEnabled = false
proguardFiles += file('proguard-rules.txt')
}
}
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
}
android.ndk {
moduleName = "jniSample"
}
android.productFlavors {
// for detailed abiFilter descriptions, refer …Run Code Online (Sandbox Code Playgroud) 我有两个实体"CAR"和"COLOR".
在"COLOR"中,我有两个属性.
在"CAR"中,我有三个属性.
"COLOR"的id与"CAR"中的colourId相关.
请有人帮我写一个谓词,用于生成一种颜色的汽车阵列吗?
findViewById 在片段中不起作用 我正在尝试将列表视图添加到特定片段但我无法使用 find viewBy Id 映射列表视图控件我是 android 开发的初学者我不知道实现片段 谁能帮助我?
public class FindPeopleFragment extends Fragment {
public FindPeopleFragment(){}
private static final String TAG = "CardListActivity";
private CardArrayAdapter cardArrayAdapter;
private ListView listView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_find_people, container, false);
return rootView;
listView = (ListView) findViewById(R.id.card_listView);
listView.addHeaderView(new View(this));
listView.addFooterView(new View(this));
cardArrayAdapter = new CardArrayAdapter(getApplicationContext(), R.layout.list_item_card);
for (int i = 0; i < 10; i++) {
Card card = new Card("Card " + (i+1) …Run Code Online (Sandbox Code Playgroud)