所以我有一个工作正常的广播接收器。问题是，当它被调用时，我不能改变片段，因为我的类扩展了BroadcastReceiver而不是Activity或Fragment。因此，我无权访问getFragmentManager（）或getSupportFragmentManager（）。我不确定如何继续，感谢任何帮助。
BroadcastReceiver类：
package lucaclock.moticlock;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class AlarmManagerBroadcastReceiver extends BroadcastReceiver {
public static final String numAlarmsPreferences = "numAlarmsPreferences";
public static final String numAlarmsKey = "numAlarmsKey";
public static final String alarm1Preferences = "alarm1Preferences";
public static final String alarm2Preferences = "alarm2Preferences";
public static final String alarm3Preferences = "alarm3Preferences";
public static final String alarm4Preferences = "alarm4Preferences";
public static final String alarmTimeDisplayKey = "alarmTimeDisplayKey";
public static final String alarmTimeRequestedKey = "alarmTimeRequestedKey";
public static final String alarmNameKey = "alarmNameKey";
public static final String alarmOccuranceKey = "alarmOccuranceKey";
public static final String alarmActiveKey = "alarmActiveKey";
public static final String alarmSoundUriKey = "alarmSoundUriKey";
public static final String alarmSoundTitleKey = "alarmSoundTitleKey";
public static final String alarmVolumeKey = "alarmVolumeKey";
public static final String alarmSnoozeKey = "alarmSnoozeKey";
public static final String alarmVisibleKey = "alarmVisibleKey";
public static final String alarmRunningKey = "alarmVisibleKey";
public boolean alarm1Active;
public boolean alarm2Active;
public boolean alarm3Active;
public boolean alarm4Active;
public void onReceive(Context context, Intent intent) {
WakeLocker.acquire(context);
MainActivity mA = new MainActivity();
mA.updateFragment(HomeFragment.class, null);
Toast.makeText(context, "ALARM ACTIVE!!!", Toast.LENGTH_LONG).show();
/*---------------THIS CODE IS RUN WHEN THE ALARM IS ACTIVE----------------------//
//
//------------------------------------------------------------------------------//
*/
//initialize preferences
AppSharedPreferences alarm1Prefs = AppSharedPreferences.getInstance(context, alarm1Preferences);
AppSharedPreferences alarm2Prefs = AppSharedPreferences.getInstance(context, alarm2Preferences);
AppSharedPreferences alarm3Prefs = AppSharedPreferences.getInstance(context, alarm3Preferences);
AppSharedPreferences alarm4Prefs = AppSharedPreferences.getInstance(context, alarm4Preferences);
alarm1Active = alarm1Prefs.getBoolean(alarmActiveKey, false);
alarm2Active = alarm2Prefs.getBoolean(alarmActiveKey, false);
alarm3Active = alarm3Prefs.getBoolean(alarmActiveKey, false);
alarm4Active = alarm4Prefs.getBoolean(alarmActiveKey, false);
}
public void cancelAlarm(Context context)
{
Toast.makeText(context, "Alarm canceled successfully", Toast.LENGTH_LONG).show();
Intent intent = new Intent(context, AlarmManagerBroadcastReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(sender);
AppSharedPreferences mPref = AppSharedPreferences.getInstance(context, alarm1Preferences);
mPref.putBoolean(alarmRunningKey, false);
mPref.putBoolean(alarmActiveKey, false);
WakeLocker.release();
}
}
答案 0 :(得分：0)
要做你想做的事，你只需要在BroadcastReceiver Activity注册你的onResume()，然后在onStop()注销。请参阅以下示例，您可以在其中注册BroadcastReceiver。
public class MyActivity extends Activity {
// ...
private BroadcastReceiver mReceiver;
// ...
@Override
public void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter();
filter.addAction("...");
// ...
mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context pContext, Intent pIntent) {
String action = pIntent.getAction();
// ...
}
};
registerReceiver(mReceiver, filter);
}
@Override
public void onStop() {
super.onStop();
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
}
}
我更新的MainActivity类：
package lucaclock.moticlock;
import android.app.AlarmManager;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
//public static int numAlarms = 0;
public boolean alarm1Active; //means the alarm is set and will go off when specified time is reached
public boolean alarm1Visible = true; //means the alarm has been added and is now visible on the main screen
public boolean alarm2Visible = true;
public boolean alarm2Active;
public boolean alarm3Visible = true;
public boolean alarm3Active;
public boolean alarm4Visible = true;
public boolean alarm4Active;
public AlarmManager alarmManager;
public PendingIntent alarmIntent;
public static final String numAlarmsPreferences = "numAlarmsPreferences";
public static final String numAlarmsKey = "numAlarmsKey";
public static final String alarm1Preferences = "alarm1Preferences";
public static final String alarm2Preferences = "alarm2Preferences";
public static final String alarm3Preferences = "alarm3Preferences";
public static final String alarm4Preferences = "alarm4Preferences";
public static final String alarmTimeDisplayKey = "alarmTimeDisplayKey";
public static final String alarmTimeRequestedKey = "alarmTimeRequestedKey";
public static final String alarmDateKey = "alarmDateKey";
public static final String alarmNameKey = "alarmNameKey";
public static final String alarmOccuranceKey = "alarmOccuranceKey";
public static final String alarmActiveKey = "alarmActiveKey";
public static final String alarmRunningKey = "alarmRunningKey";
public static final String alarmSoundUriKey = "alarmSoundUriKey";
public static final String alarmSoundTitleKey = "alarmSoundTitleKey";
public static final String alarmVolumeKey = "alarmVolumeKey";
public static final String alarmSnoozeKey = "alarmSnoozeKey";
public static final String alarmVisibleKey = "alarmVisibleKey";
private AlarmManagerBroadcastReceiver alarm;
private BroadcastReceiver mReceiver;
public boolean alarm1Running;
public View view;
public boolean devMode = true;
public boolean fragSwitch;
//private AHBottomNavigation bottomNavigation;
//private ArrayList<com.aurelhubert.ahbottomnavigation.AHBottomNavigationItem> menuItemsList;
//public boolean firstRun;
public int currentFragment; //1 = HomeFragment 2 = AddAlarmFragment 3 = DeleteAlarmFragment
@Override
public void onStart() {
super.onStart();
IntentFilter filter = new IntentFilter();
filter.addAction("...");
// ...
mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context pContext, Intent pIntent) {
String action = pIntent.getAction();
Toast.makeText(getApplicationContext(), "We have received the alarm!", Toast.LENGTH_LONG).show();
thirdFragment tFrag = new thirdFragment();
replaceFragment(tFrag);
}
};
registerReceiver(mReceiver, filter);
}
@Override
public void onStop() {
super.onStop();
if (mReceiver != null) {
unregisterReceiver(mReceiver);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Context context = this.getApplicationContext();
Toolbar tb = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(tb);
currentFragment = 1;
if(devMode = true) {
final FloatingActionButton fabClearPref = (FloatingActionButton) findViewById(R.id.fabClearPref);
fabClearPref.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
for (int i = 0; i < 5; i++) {
HomeFragment hFrag = new HomeFragment();
if (i == 0) {
AppSharedPreferences mPref = AppSharedPreferences.getInstance(getApplicationContext(), alarm1Preferences);
mPref.clearPref();
hFrag.numAlarmsGlobal = 0;
} else if (i == 1) {
AppSharedPreferences mPref = AppSharedPreferences.getInstance(getApplicationContext(), alarm2Preferences);
mPref.clearPref();
hFrag.numAlarmsGlobal = 0;
} else if (i == 2) {
AppSharedPreferences mPref = AppSharedPreferences.getInstance(getApplicationContext(), alarm3Preferences);
mPref.clearPref();
hFrag.numAlarmsGlobal = 0;
} else if (i == 3) {
AppSharedPreferences mPref = AppSharedPreferences.getInstance(getApplicationContext(), alarm4Preferences);
mPref.clearPref();
hFrag.numAlarmsGlobal = 0;
} else if (i == 4) {
AppSharedPreferences mPref = AppSharedPreferences.getInstance(getApplicationContext(), numAlarmsPreferences);
mPref.clearPref();
hFrag.numAlarmsGlobal = 0;
}
fabClearPref.setVisibility(View.INVISIBLE);
}
}
});
fabClearPref.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v)
{
fabClearPref.setVisibility(View.INVISIBLE);
return true;
}
});
}
/*---------------THIS IS THE ACTUAL ALARM----------------//
//-----------THAT SHOWS UP WHEN THE SET TIME-------------//
//---------------AND THE ACTUAL TIME MATCH---------------//
*/
AppSharedPreferences alarm1Prefs = AppSharedPreferences.getInstance(this.getApplicationContext(), alarm1Preferences);
AppSharedPreferences alarm2Prefs = AppSharedPreferences.getInstance(this.getApplicationContext(), alarm2Preferences);
AppSharedPreferences alarm3Prefs = AppSharedPreferences.getInstance(this.getApplicationContext(), alarm3Preferences);
AppSharedPreferences alarm4Prefs = AppSharedPreferences.getInstance(this.getApplicationContext(), alarm4Preferences);
/*
alarm1Active = alarm1Prefs.getBoolean(alarmActiveKey, false);
alarm2Active = alarm2Prefs.getBoolean(alarmActiveKey, false);
alarm3Active = alarm3Prefs.getBoolean(alarmActiveKey, false);
alarm4Active = alarm4Prefs.getBoolean(alarmActiveKey, false);
*/
//alarm1Active = true;
Fragment homeFragment = new HomeFragment();
replaceFragment(homeFragment);
//fabClearPref.setVisibility(View.INVISIBLE);
//initBottomBar();
}
public void readPreferences(View view)
{
//dialogBuilder("VERIFICATION 0x12", "Reading Preferences!");
AppSharedPreferences alarm1Pref = AppSharedPreferences.getInstance(getApplicationContext(), alarm1Preferences);
AppSharedPreferences alarm2Pref = AppSharedPreferences.getInstance(getApplicationContext(), alarm2Preferences);
AppSharedPreferences alarm3Pref = AppSharedPreferences.getInstance(getApplicationContext(), alarm3Preferences);
AppSharedPreferences alarm4Pref = AppSharedPreferences.getInstance(getApplicationContext(), alarm4Preferences);
alarm1Active = alarm1Pref.getBoolean(alarmActiveKey, false);
alarm1Running = alarm1Pref.getBoolean(alarmRunningKey, false);
//TODO: Add alarm2 booleans when alarm1 booleans confirmed working
}
public void replaceFragment(Fragment fragment)
{
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
//fragmentTransaction.setCustomAnimations(enterTransition, exitTransition);
fragmentTransaction.replace(R.id.frame_container, fragment);
//fragmentTransaction.addToBackStack(fragment.toString());
fragmentTransaction.commit();
}
public void updateFragment(Class<?> clazz, Bundle args) {
String tag = clazz.getName();
FragmentManager fragmentManager = getFragmentManager();
Fragment fragment = fragmentManager.findFragmentByTag(tag);
if (fragment == null) {
fragment = Fragment.instantiate(this, tag, args);
fragment.setRetainInstance(true);
}
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.addToBackStack(tag);
transaction.replace(R.id.frame_container, fragment, tag);
transaction.commit();
}
public void onBackPressed()
{
FragmentManager fm = getFragmentManager();
DialogView dv = new DialogView();
dv.show(fm, "Fragment");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.menu_home:
HomeFragment homeFragment = new HomeFragment();
replaceFragment(homeFragment);
return false;
case R.id.menu_alarm:
thirdFragment alarmFragment = new thirdFragment();
replaceFragment(alarmFragment);
currentFragment = 2;
return true;
/*case R.id.menu_deletealarm:
thirdFragment deleteAlarmFragment = new thirdFragment();
replaceFragment(deleteAlarmFragment);
currentFragment = 3;
return true;*/
case R.id.menu_settings:
fourthFragment settingsFragment = new fourthFragment();
replaceFragment(settingsFragment);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
/*
FloatingActionButton fabAddAlarm = (FloatingActionButton) findViewById(R.id.fabAddAlarm);
fabAddAlarm.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
setContentView(R.layout.activity_addalarm);
}
});
*/
}