All UI operations have to run on Main UI Thread. So if you want to show a toast message, this shouldn't done in a seperated Thread. In this case, toast message has to be in runOnUiThread()
block as seen below.
public class MainActivity extends Activity{
List<String>sName=new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(this, "Loadingg", Toast.LENGTH_LONG).show();
Thread thr=new Thread(){
@Override
public void run (){
try {
sleep(5000);
StringBuilder message=DisplaySensors();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),message, Toast.LENGTH_LONG).show();
}
});
} catch (Exception e) {
// TODO: handle exception
}
}
private StringBuilder DisplaySensors() {
SensorManager sm=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
List<Sensor>sList=sm.getSensorList(Sensor.TYPE_ALL);
StringBuilder sb=new StringBuilder();
for (int i = 0; i <sList.size(); i++) {
sb.append(((Sensor)sList.get(i)).getName()).append("\n");
}
return sb;
}
};
thr.start();
}