我有一个MainActivity,我想在每2分钟调用一次AlarmManager后更新UI ..请帮我怎么做
这是我的MainActivity
public class MainActivity extends AppCompatActivity {
private Toolbar toolbar;
GPSTracker gps;
TextView lat1, long1;
Button exit, refresh;
private PendingIntent pendingIntent;
private static MainActivity mInst;
double newLat, newLong;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
toolbar.setTitle("PWD_GPSFinder");
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
lat1 = (TextView) findViewById(R.id.latitude);
long1 = (TextView) findViewById(R.id.longitude);
exit = (Button) findViewById(R.id.button);
exit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
refresh = (Button) findViewById(R.id.buttonRefresh);
Intent alarmIntent = new Intent(MainActivity.this, BroadcastReceiver.class);
pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, alarmIntent, 0);
startAlarm();
refresh.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
gps = new GPSTracker(MainActivity.this);
// check if GPS enable
if(gps.canGetLocation()){
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
lat1.setText(""+latitude);
long1.setText(""+longitude);
}else{
gps.showSettingsAlert();
}
}
});
gps = new GPSTracker(MainActivity.this);
// check if GPS enabled
if(gps.canGetLocation()){
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
lat1.setText(""+latitude);
long1.setText(""+longitude);
}else{
gps.showSettingsAlert();
}
}
public void startAlarm(){
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
/* Repeating on every 20 minutes interval */
manager.setRepeating(AlarmManager.RTC_WAKEUP, 0,
10 * 60 * 20, pendingIntent);
Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
protected void onResume() {
super.onResume();
// Other onResume() code here
this.registerReceiver(mMessageReceiver, new IntentFilter("some_unique_name"));
}
@Override
protected void onPause() {
super.onPause();
this.unregisterReceiver(mMessageReceiver);
// Other onPause() code here
}
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// Extract data included in the Intent
String message = intent.getStringExtra("lat");
String msg2 = intent.getStringExtra("long");
updateYourActivity(context);
lat1.setText(""+message);
long1.setText(""+msg2);
//update the TextView
Toast.makeText(context, "Alarm Settttttttt", Toast.LENGTH_SHORT).show();
}
};
private void updateYourActivity(Context context) {
Intent intent = new Intent("some_unique_name");
// put whatever data you want to send, if any
// intent.putExtra("message", message);
// send broadcast
Toast.makeText(context, "Alarm Setdfdgdfgdfgtt", Toast.LENGTH_SHORT).show();
newLat = gps.getLatitude();
newLong = gps.getLongitude();
intent.putExtra("lat", newLat);
intent.putExtra("long", newLong);
context.sendBroadcast(intent);
}
}
和AlarmReceiver类
public class AlarmReceiver extends BroadcastReceiver {
GPSTracker gps;
String strDateTime;
String strDate;
FileWriter writer;
public static String username1;
File gpxfile;
File gpxfile1;
double latitude;
double longitude;
@Override
public void onReceive(Context context, Intent intent) {
gps = new GPSTracker(context);
// check if GPS enabled
if(gps.canGetLocation()){
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// lat1.setText(""+latitude);
//long1.setText(""+longitude);
}else{
// can't get location
// GPS or Network is not enabled
// Ask user to enable GPS/network in settings
gps.showSettingsAlert();
}
}
如何在这里设置TextView的值?请帮帮我。
答案 0 :(得分:2)
从BroadcastReciever更新活动的一种方法是在MainActivity中创建一个BroadcastReciever:
private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// Extract data included in the Intent
// String message = intent.getStringExtra("message");
//update the TextView
}
};
在onResume中重新启动此BroadcastReciever:
this.registerReceiver(mMessageReceiver, new IntentFilter("some_unique_name"));
和unregiester onPause:
this.unregisterReceiver(mMessageReceiver);
在AlarmReceiver中只需使用:
private void updateYourActivity(Context context) {
Intent intent = new Intent("some_unique_name");
// put whatever data you want to send, if any
// intent.putExtra("message", message);
// send broadcast
context.sendBroadcast(intent);
}