我有两个信标，当第一个信标在1米以内时，我启动第一个活动，当第二个信标在一米以内时我启动第二个活动。
现在我想要的是，如果第一个活动被触发一次，那么应用程序就不应该再次启动第一个活动，但问题是，如果我从第一个活动按下后退按钮，那么如果第一个信标在1米内，那么第一个活动就会再次启动，而我对第二个信标也面临同样的问题
我的清单文件代码是：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.altbeacon.beaconreference"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:name="org.altbeacon.beaconreference.MyApplicationName">
<activity
android:launchMode="singleInstance"
android:name="org.altbeacon.beaconreference.FirstActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:launchMode="singleInstance"
android:name="org.altbeacon.beaconreference.SecondActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="org.altbeacon.beaconreference.SECONDACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
我的应用程序类代码是：
import java.util.Collection;
import android.app.Application;
import android.content.Intent;
import android.os.RemoteException;
import android.util.Log;
import android.widget.Toast;
import org.altbeacon.beacon.powersave.BackgroundPowerSaver;
import org.altbeacon.beacon.startup.BootstrapNotifier;
import org.altbeacon.beacon.startup.RegionBootstrap;
import org.altbeacon.beacon.Beacon;
import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.BeaconParser;
import org.altbeacon.beacon.RangeNotifier;
import org.altbeacon.beacon.Region;
public class MyApplicationName extends Application implements BootstrapNotifier, RangeNotifier {
private static final String TAG = ".MyApplicationName";
private RegionBootstrap regionBootstrap;
private BeaconManager mBeaconManager;
private Region region;
private Region mAllBeaconsRegion;
private BackgroundPowerSaver mBackgroundPowerSaver;
private RegionBootstrap mRegionBootstrap;
private static final String ESTIMOTE_PROXIMITY_UUID = "XYZ";
@Override
public void onCreate() {
mAllBeaconsRegion = new Region("all beacons",null, null, null);
mBeaconManager = BeaconManager.getInstanceForApplication(this);
mBackgroundPowerSaver = new BackgroundPowerSaver(this);
mRegionBootstrap = new RegionBootstrap(this, mAllBeaconsRegion);
// By default the AndroidBeaconLibrary will only find AltBeacons. If you wish to make it
// find a different type of beacon, you must specify the byte layout for that beacon's
// advertisement with a line like below. The example shows how to find a beacon with the
// same byte layout as AltBeacon but with a beaconTypeCode of 0xaabb
//
Log.d(TAG, " region. starting ranging");
mBeaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
mBeaconManager.setBackgroundScanPeriod(11000l);
mBeaconManager.setBackgroundBetweenScanPeriod(30000l);
}
@Override
public void didDetermineStateForRegion(int arg0, Region arg1) {
// Don't care
}
@Override
public void didEnterRegion(Region arg0) {
//mRegionBootstrap.disable();
try {
//mBeaconManager.startRangingBeaconsInRegion(region);
mBeaconManager.startRangingBeaconsInRegion(mAllBeaconsRegion);
mBeaconManager.setRangeNotifier(this);
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Toast.makeText(this, "didEnterRegion", Toast.LENGTH_LONG).show();
//Toast.makeText(this, "didEnterRegion", Toast.LENGTH_LONG).show();
Log.d(TAG, "Got a didEnterRegion call");
// This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
// if you want the Activity to launch every single time beacons come into view, remove this call.
}
@Override
public void didExitRegion(Region arg0) {
// Don't care
}
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
//mRegionBootstrap.disable();
// TODO Auto-generated method stub
if (beacons.size() > 0) {
for (Beacon beacon: beacons) {
String beconid=beacon.toString();
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 20155 id3: 28577"))
{
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, FirstActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 8128 id3: 59794"))
{
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, SecondActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
}
}
}
}
您应该在找到一个信标后停止寻找信标，只在某个延迟后重新开始寻找，或者您可以保存最后一个找到的信标的ID，并忽略该信标一段时间或直到它超出范围。
你可以用这样的东西忽略信标60秒：
private String lastBeaconId = "";
private long lastTimeFound = 0;
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
//mRegionBootstrap.disable();
// TODO Auto-generated method stub
if (beacons.size() > 0) {
for (Beacon beacon: beacons) {
String beconid=beacon.toString();
if (beconid.equals(lastBeaconId)){
long diff = new Date().getTime();
//ignore this beacon if it was found 60 seconds ago
if(diff - lastTimeFound >= 60*1000){
continue;
}
}
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 20155 id3: 28577"))
{
//save this beacon
lastTimeFound = new Date().getTime();
lastBeaconId = beconid;
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, FirstActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 8128 id3: 59794"))
{
//save this beacon
lastTimeFound = new Date().getTime();
lastBeaconId = beconid;
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, SecondActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
}
}
}
我相信这不是一个那么复杂的问题，
它可以通过两个步骤解决：
1.在激活活动时在一致性内存中设置布尔值
2.当主活动重新启动时，在一致性内存中重置布尔值
- 在一致内存中设置SharedPreferences
在开始活动1 之前
SharedPreferences sp = context.getSharedPreferences("MyPrefs", MODE_PRIVATE);
if(sp.getBoolean("activity1",false)==false){
sp.edit().putBoolean ("activity1", true).commit();
startActivity(activity1);
}
- 重置一致性内存
将此添加到主活动中的onCreate中
@Override
protected void onCreate() {
SharedPreferences sp = context.getSharedPreferences("MyPrefs", MODE_PRIVATE);
sp.edit().putBoolean ("activity1", false).commit();
super.onResume();
}
如果需要，可以将SharedPreferences sp = context.getSharedPreferences("MyPrefs", MODE_PRIVATE);创建为全局变量
解决这个问题的一个简单方法似乎是存储如下布尔标志：
private Boolean firstActivityLaunched = false;
private Boolean secondActivityLaunched = false;
然后更改您的代码以使用这些：
@Override
public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {
//mRegionBootstrap.disable();
// TODO Auto-generated method stub
if (beacons.size() > 0) {
for (Beacon beacon: beacons) {
String beconid=beacon.toString();
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 20155 id3: 28577") && !firstActivityLaunched)
{
firstActivityLaunched = true;
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, FirstActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
if(beacon.getDistance()<1 && beconid.equals("id1: b9407f30-f5f8-466e-aff9-25556b57fe6d id2: 8128 id3: 59794") && !secondActivityLaunched)
{
secondActivityLaunched = true;
Log.d(TAG, "within 1 minute call");
Intent intent = new Intent(this, SecondActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
this.startActivity(intent);
}
}
}
}