我想在我的Android应用程序中获取可用的蓝牙设备,以便我可以通过我的应用程序配对或不公平设备。我正在注册广播接收器以通知我的新设备列表。我在一个活动中执行此操作,但是当我使用finish()
销毁我的活动时,即使我取消注册接收器,它仍然会给我以下错误。
例外:
03-10 10:24:48.790 25219-25219/com.vidame E/ActivityThread: Activity com.vidame.Activities.BloodPressureActivity has leaked IntentReceiver com.vidame.HelperClasses.Bluetooth$mPairReceiver@37341ff5 that was originally registered here. Are you missing a call to unregisterReceiver()?
android.app.IntentReceiverLeaked: Activity com.vidame.Activities.BloodPressureActivity has leaked IntentReceiver com.vidame.HelperClasses.Bluetooth$mPairReceiver@37341ff5 that was originally registered here. Are you missing a call to unregisterReceiver()?
at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:904)
at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:705)
at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1685)
at android.app.ContextImpl.registerReceiver(ContextImpl.java:1665)
at android.app.ContextImpl.registerReceiver(ContextImpl.java:1659)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:495)
at com.vidame.HelperClasses.Bluetooth.registerBluetoothBroadcast(Bluetooth.java:83)
at com.vidame.Activities.BloodPressureActivity$2.onClick(BloodPressureActivity.java:119)
at android.view.View.performClick(View.java:4789)
at android.view.View$PerformClick.run(View.java:19881)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
我在 Bluetooth.java 类中使用了我的broadcast receiver
方法,并在我的应用中使用了其他有用的方法,并在BloodPressureActivity
中调用它。下面我有这两个类的代码
这是我在BloodPressureActivity
devices_list.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
bluetooth.registerBluetoothBroadcast(BloodPressureActivity.this, mAdapter, list, mProgressDlg, mListView);
device_find.setVisibility(View.GONE);
devices_list.setVisibility(View.GONE);
list_view.setVisibility(View.VISIBLE);
bluetooth.bAdapter().startDiscovery();
}
});
我在我的onDestroy()和onStop()
中取消注册
@Override
public void onDestroy() {
bluetooth.unRegisterReceiver();
super.onDestroy();
}
@Override
protected void onStop() {
bluetooth.unRegisterReceiver();
super.onStop();
}
现在在Bluetooth.class我的广播接收器
public void registerBluetoothBroadcast (Activity parent, DeviceListAdapter mAdapter, ArrayList<BluetoothDevice> list, ProgressDialog mProgressDlg, ListView mListView){
this.activity=parent;
this.mAdapter=mAdapter;
this.list=list;
this.mProgressDlg=mProgressDlg;
this.mListView=mListView;
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
//filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
activity.registerReceiver(mPairReceiver, filter);
}
public final BroadcastReceiver mPairReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);
final int prevState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, BluetoothDevice.ERROR);
if (state == BluetoothDevice.BOND_BONDED && prevState == BluetoothDevice.BOND_BONDING) {
ShowMessage("Paired");
} else if (state == BluetoothDevice.BOND_NONE && prevState == BluetoothDevice.BOND_BONDED){
ShowMessage("Unpaired");
}
mAdapter.notifyDataSetChanged();
}else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
list = new ArrayList<>();
mProgressDlg.show();
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
mProgressDlg.dismiss();
showDevicesList(list);
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
list.add(device);
ShowMessage("Found device " + device.getName());
}
}
};
public void unRegisterReceiver(){
if(mPairReceiver!=null){
LocalBroadcastManager.getInstance(activity).unregisterReceiver(mPairReceiver);
}
}
我是否遗漏了未注册接收者的事情?
答案 0 :(得分:1)
您在onDestroy()
和onStop()
中取消注册两次。
如果您在onCreate方法中注册广播,则必须在onDestroy
中取消注册,如果您在onStart
注册广告,则必须在onStop
中取消注册。
在您的情况下,您在clickListener中注册广播,因此如果用户未单击此按钮,则不会注册广播,并且您之后尝试取消注册。因此,如果广播已注册,您必须进行测试。
我建议你添加一个布尔属性,当用户点击这个按钮时,如果你在true
你在这个布尔值上测试,你将这个属性设置为onDestroy
,如果它是真的,你取消注册你的广播。 / p>
devices_list.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
bluetooth.registerBluetoothBroadcast(BloodPressureActivity.this, mAdapter, list, mProgressDlg, mListView);
registred = true;
device_find.setVisibility(View.GONE);
devices_list.setVisibility(View.GONE);
list_view.setVisibility(View.VISIBLE);
bluetooth.bAdapter().startDiscovery();
}
});
onDestroy{
...//your code
if(registred){
unregisterBroadcast(your broadcast);
}
}