Java 为什么活动类中的BroadCastReceiver未接收到LocalBroadCastManager从IntentService发送的意图?
选择LanguageFragment.javaJava 为什么活动类中的BroadCastReceiver未接收到LocalBroadCastManager从IntentService发送的意图?,java,android,android-layout,listview,android-fragments,Java,Android,Android Layout,Listview,Android Fragments,选择LanguageFragment.java Intent explicitGetNumberServiceIntentUSA = new Intent(getActivity(), GetNumberService.class); explicitGetNumberServiceIntentUSA.putExtra("country", "USA"); getActivity().startService(explicitGetNumberServiceIntentUSA); 这就是Get
Intent explicitGetNumberServiceIntentUSA = new Intent(getActivity(), GetNumberService.class);
explicitGetNumberServiceIntentUSA.putExtra("country", "USA");
getActivity().startService(explicitGetNumberServiceIntentUSA);
这就是GetNumberService的调用方式
这就是从GetNumberService.java传递arraylist的方式
Intent mobileNumbersIntent = new Intent();
mobileNumbersIntent.putStringArrayListExtra("mobileNumbers", mobileNumberList);
mobileNumbersIntent.setAction(ChooseNumber1.MobileNumberBroadcastReceiver.MOBILE_NO_RECEIVER);
mobileNumbersIntent.addCategory(Intent.CATEGORY_DEFAULT);
mobileNumbersIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //this is needed when callling startActivity() outisde an Activity
sendBroadcast(mobileNumbersIntent);
在onHandleIntent()方法中
GetNumberService完美地完成了它的工作
选择编号1.java
public class ChooseNumber1 extends AppCompatActivity {
private MobileNumberBroadcastReceiver receiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
IntentFilter intentFilter = new IntentFilter(MobileNumberBroadcastReceiver.MOBILE_NO_RECEIVER);
intentFilter.addCategory(Intent.CATEGORY_DEFAULT);
receiver = new MobileNumberBroadcastReceiver();
registerReceiver(receiver, intentFilter);
setContentView(R.layout.activity_choose_number1);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
protected void onDestroy(){
unregisterReceiver(receiver);
super.onDestroy();
}
public class MobileNumberBroadcastReceiver extends BroadcastReceiver {
public static final String MOBILE_NO_RECEIVER = "abcd";
ArrayList<String> mobileNumbersList = new ArrayList<>();
ListView mobileNumberListView;
ArrayAdapter<String> mobileNumberAdapter;
@Override
public void onReceive(Context context, Intent intent) {
// if(intent.getAction().equals(GetNumberService.MOBILE_NUMBER_LIST_PASS_ACTION)){
mobileNumbersList = intent.getStringArrayListExtra("mobileNumberList");
// }
mobileNumberAdapter = new ArrayAdapter<String>(new ChooseNumbers(),
R.layout.list_item_numbers, R.id.list_item_number_textview, mobileNumbersList);
mobileNumberListView = (ListView) findViewById(R.id.listViewNumberList);
mobileNumberListView.setAdapter(mobileNumberAdapter);
}
}
}
公共类选择编号1扩展AppCompative活动{
专用移动通信接收机;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
IntentFilter IntentFilter=新的IntentFilter(MobileNumberBroadcastReceiver.MOBILE\u NO\u RECEIVER);
intentFilter.addCategory(Intent.CATEGORY\u默认值);
receiver=新的MobileNumberBroadcastReceiver();
注册接收者(接收者、意图过滤器);
setContentView(R.layout.activity\u choose\u number1);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@凌驾
受保护的空onDestroy(){
未注册接收人(接收人);
super.ondestory();
}
公共类MobileNumberBroadcastReceiver扩展了BroadcastReceiver{
公共静态最终字符串MOBILE\u NO\u RECEIVER=“abcd”;
ArrayList MobileNumberList=新的ArrayList();
ListView-mobileNumberListView;
阵列适配器;
@凌驾
公共void onReceive(上下文、意图){
//if(intent.getAction().equals(GetNumberService.MOBILE\u NUMBER\u LIST\u PASS\u ACTION)){
mobileNumberList=intent.getStringArrayListExtra(“mobileNumberList”);
// }
mobileNumberAdapter=new ArrayAdapter(new ChooseNumber(),
R.layout.list\u item\u number、R.id.list\u item\u number\u textview、mobileNumberList);
mobileNumberListView=(ListView)findViewById(R.id.listViewNumberList);
setAdapter(mobileNumberAdapter);
}
}
}
活动\u选择\u number1.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.a2ndnumber.a2ndnumber.ChooseNumbers">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_choose_number1" />
</android.support.design.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.a2ndnumber.a2ndnumber.ChooseNumber1"
tools:showIn="@layout/activity_choose_number1">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listViewNumberList"/>
</RelativeLayout>
content\u choose\u number1.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.a2ndnumber.a2ndnumber.ChooseNumbers">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_choose_number1" />
</android.support.design.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.a2ndnumber.a2ndnumber.ChooseNumber1"
tools:showIn="@layout/activity_choose_number1">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/listViewNumberList"/>
</RelativeLayout>
附注2:
问题是,我无法在ChooseNumber1.java或ChooseNumbersFragment.java中接收MobileNumberIntent。我认为问题在于BroadcastManager.java。如果我调试,它将转到Handler.java和其他几个类,最后是mId=-1,堆栈跟踪中没有错误。我被打动了
PS:AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.a2ndnumber.a2ndnumber">
<!-- TODO : Add permissions -->
<uses-permission android:name="android.permission.INTERNET" />
<!-- Contacts -->
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".ChooseLanguage"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
</activity>
<activity
android:name=".Choose_Country"
android:label="@string/app_name"
android:parentActivityName=".ChooseLanguage"
android:theme="@style/AppTheme.NoActionBar">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.a2ndnumber.a2ndnumber.ChooseLanguage" />
</activity>
<activity
android:name=".MainActivity"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".service.GetNumberService" />
<activity
android:name=".ChooseNumber1"
android:label="@string/title_activity_choose_number1"
android:parentActivityName=".Choose_Country"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.a2ndnumber.a2ndnumber.Choose_Country" />
</activity>
</application>
</manifest>
PS:在阅读了Stackoverflow中的大量示例和答案后,我对代码进行了大量修改。这是我的最新代码。看起来问题在于意图过滤器和/或使用操作获取意图。请帮帮我。谢谢。您的findViewById()
很好,返回一个非空值
问题在于stacktrace中的适配器:分配适配器时,传递给它的mobileNumbersList
列表为空ArrayAdapter
需要非空数组
(代码中还有许多其他问题-这只是NPE。)我建议检查此简单代码是否有效: 内部活动:
@Override
protected void onResume() {
super.onResume();
IntentFilter intFilt = new IntentFilter(MYBROADCASTINGSTRING);
registerReceiver(updbr,intFilt);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(updbr);
}
private BroadcastReceiver updbr = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent2) {
try {
Log.d("MYLOG", "gotcha!");
} catch (Exception e) {
}
}
};
在接球时在发球中施放broadbast:
Intent intentBR = new Intent(MYBROADCASTINGSTRING);
intentBR.putExtra(somestring, "teststring");
sendBroadcast(intentBR);
其中,MYBROADCASTINGSTRING
是某个常量。例如,公共最终静态字符串MYBROADCASTINGSTRING=“MYBROADCASTINGSTRING”代码>
它不需要改进AndroidManifest.xml
。它有用吗 当你发送广播时,你会传递一个额外的信息,就像这样
mobileNumbersIntent.putStringArrayListExtra("mobileNumbers", mobileNumberList);
当你在广播接收器中读到这些额外的信息时,你就是这样做的
mobileNumbersList = intent.getStringArrayListExtra("mobileNumberList");
您应该使用同一个键作为附加项。为此,我建议在IntentService
中使用一个常量
public static final string EXTRA_MOBILE_NUMBERS = "mobile_numbers";
然后你可以做一些事情,比如:
mobileNumbersIntent.putStringArrayListExtra(MyIntentService.EXTRA_MOBILE_NUMBERS, mobileNumberList);
及
要处理来自IntentService的结果,请使用ResultReciver而不是广播接收器
像这样,
步骤1:在活动中使用ResultReceiver创建结果处理程序
public ResultReceiver downloadReceiver = new ResultReceiver(new Handler()) {
@Override
protected void onReceiveResult(int resultCode, Bundle resultData) {
super.onReceiveResult(resultCode, resultData);
//Broadcast /send the result code in intent service based on your logic(success/error) handle with switch
switch (resultCode) {
case 1: {
//Get the resultData and do your logic here
//Update your list view item here
break;
}
case 2: {
//Get the resultData and do your logic here
//Update your list view item here
break;
}
}
}
};
步骤2:将结果处理程序放入intent中并启动intent服务
Intent intent = new Intent(getContext(), DownloadService.class);
intent.putExtra("receiver",downloadReceiver);
步骤3:在服务类中处理意图(获取结果处理程序的值)
步骤4:向结果处理程序发送/广播数据
final ResultReceiver receiver;
@Override
protected void onHandleIntent(Intent intent) {
receiver = intent.getParcelableExtra("receiver");
}
//based on your logic, change the result code and data
//Add your result data (success scenario)
Bundle bundle = new Bundle();
bundle.putString("result","Some text");
receiver.send(1,bundle);
//Add your result data (failure scenario)
receiver.send(0,bundle);
所需的流不需要广播和接收器设置。由于选择编号1
活动将在服务
完成其工作后启动,因此只需将阵列列表
附加到用于启动选择编号1
的意图
。然后可以在onCreate()
中检索列表,您的ListView
及其适配器可以立即初始化,而不是试图等待广播
例如,在您的服务中
,在组合列表后:
Intent mobileNumbersIntent = new Intent(this, ChooseNumber1.class);
mobileNumbersIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mobileNumbersIntent.putStringArrayListExtra("mobileNumbers", mobileNumberList);
startActivity(mobileNumbersIntent);
然后,在活动中
:
public class ChooseNumber1 extends AppCompatActivity {
private ArrayAdapter<String> mobileNumberAdapter;
private ArrayList<String> mobileNumbersList = new ArrayList<>();
private ListView mobileNumberListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_choose_number1);
...
mobileNumberListView = (ListView) findViewById(R.id.listViewNumberList);
mobileNumbersList = getIntent().getStringArrayListExtra("mobileNumbers");
if(mobileNumbersList != null) {
mobileNumberAdapter = new ArrayAdapter<String>(this,
R.layout.list_item_numbers,
R.id.list_item_number_textview,
mobileNumbersList);
mobileNumberListView.setAdapter(mobileNumberAdapter);
}
}
}
公共类选择编号1扩展AppCompative活动{
专用阵列适配器;
私有ArrayList MobileNumberList=新ArrayList();
私有ListView-mobileNumberListView;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u choose\u number1);
...
mobileNumberListView=(ListView)findViewById(R.id.listViewNumberList);
mobileNumbersList=getIntent().GetStringArrayListXTRA(“mobileNumbers”);
如果(MobileEnumbersList!=null){
移动通信适配器