我正在创建一个显示网络参数的应用程序。当我的双卡手机上只有一个SIM卡处于活动状态时，该应用程序可以正常工作并分别显示2g，3g或4g的参数。但是当两张SIM卡都处于活动状态时，应用程序崩溃了。我应该如何编写代码以使应用程序适用于两张SIM卡而不会崩溃？ 我是android studio和android编码的新手。
编辑[日志]：
FATAL EXCEPTION: main
Process: air.newapp.airtelapp, PID: 27711
java.lang.RuntimeException: Unable to start activity ComponentInfo{air.newapp.airtelapp/air.newapp.airtelapp.loc}: java.lang.ClassCastException: android.telephony.CellInfoGsm cannot be cast to android.telephony.CellInfoLte
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2946)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3046)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1688)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6809)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.ClassCastException: android.telephony.CellInfoGsm cannot be cast to android.telephony.CellInfoLte
at air.newapp.airtelapp.loc.onCreate(loc.java:74)
at android.app.Activity.performCreate(Activity.java:6998)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1230)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2899)
编辑[代码]：
public class loc extends Activity implements LocationListener {
LocationManager locationManager;
String provider;
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_loc);
TelephonyManager telephonyManager;
TelephonyManager telephony = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
if (telephony.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE) {
telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
// Toast.makeText(getBaseContext(), "If Clause : 02",
// Toast.LENGTH_SHORT).show();
// return;
}
// Log.i(TAG, "onCreate: 02 ");
TelephonyManager tels = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOp = tels.getNetworkOperator();
CellInfoLte cellInfoLte = (CellInfoLte) telephonyManager.getAllCellInfo().get(0);
CellSignalStrengthLte cellSignalStrengthLte = cellInfoLte.getCellSignalStrength();
int ab = cellSignalStrengthLte.getDbm();
TextView rsp = (TextView) findViewById(R.id.rsrp);
rsp.setText("RSRP:" + ab + "dbm");
int aba = cellSignalStrengthLte.getRsrq();
TextView rsrq = (TextView) findViewById(R.id.rsrq);
rsrq.setText("RSRQ: " + aba + "db");
/* int snr = cellSignalStrengthLte.getRssnr();
TextView snr1 = (TextView) findViewById(R.id.rssnr1);
snr1.setText("RSSNR:" + snr + "db");*/
CellIdentityLte cellIdentityLte = cellInfoLte.getCellIdentity();
int ta = cellIdentityLte.getTac();
TextView tac = (TextView) findViewById(R.id.tac);
tac.setText("TAC: " + ta);
int pci = cellIdentityLte.getPci();
TextView pcii = (TextView) findViewById(R.id.pci);
pcii.setText("PCI: " + pci);
TextView tech = (TextView) findViewById(R.id.tech);
tech.setText("Technology: 4G");
// Log.i(TAG, "onCreate: 03 ");
if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_GSM) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
// Toast.makeText(getBaseContext(), "If Clause : 03",
// Toast.LENGTH_SHORT).show();
return;
}
final GsmCellLocation location = (GsmCellLocation) telephony.getCellLocation();
if (location != null) {
TextView cid = (TextView) findViewById(R.id.cid);
cid.setText("ECI: " + location.getCid());
}
}
if (!TextUtils.isEmpty(networkOp)) {
int mcc = Integer.parseInt(networkOp.substring(0, 3));
int mnc = Integer.parseInt(networkOp.substring(3));
TextView mncc = (TextView) findViewById(R.id.mnc);
mncc.setText("MNC:" + mnc);
TextView mccc = (TextView) findViewById(R.id.mcc);
mccc.setText("MCC:" + mcc);
}
} else if (telephony.getNetworkType() == TelephonyManager.NETWORK_TYPE_UNKNOWN) {
telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
// Toast.makeText(getBaseContext(), "If Clause :04",
// Toast.LENGTH_SHORT).show();
return;
}
Log.i(TAG, "onCreate: 06 ");
TelephonyManager tela = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOp = tela.getNetworkOperator();
CellInfoWcdma cellInfoWcdma = (CellInfoWcdma) telephonyManager.getAllCellInfo().get(0);
CellSignalStrengthWcdma cellSignalStrengthWcdma = cellInfoWcdma.getCellSignalStrength();
int rscp1 = cellSignalStrengthWcdma.getDbm();
TextView rsp = (TextView) findViewById(R.id.rscp);
rsp.setText("RSCP:" + rscp1 + "dbm");
int asul = cellSignalStrengthWcdma.getAsuLevel();
TextView asu = (TextView) findViewById(R.id.asu);
asu.setText("ASU Level: " + asul);
CellIdentityWcdma cellIdentityWcdma = cellInfoWcdma.getCellIdentity();
int psc = cellIdentityWcdma.getPsc();
TextView psci = (TextView) findViewById(R.id.pci);
psci.setText("PSC: " + psc);
int lac = cellIdentityWcdma.getLac();
TextView lacc = (TextView) findViewById(R.id.lac);
lacc.setText("LAC: " + lac);
int cid = cellIdentityWcdma.getCid();
TextView cidd = (TextView) findViewById(R.id.cid);
cidd.setText("UCID: " + cid);
TextView tech = (TextView) findViewById(R.id.tech);
tech.setText("Technology: 3G");
if (!TextUtils.isEmpty(networkOp)) {
int mcc = Integer.parseInt(networkOp.substring(0, 3));
int mnc = Integer.parseInt(networkOp.substring(3));
TextView mncc = (TextView) findViewById(R.id.mnc);
mncc.setText("MNC:" + mnc);
TextView mccc = (TextView) findViewById(R.id.mcc);
mccc.setText("MCC:" + mcc);
}
}
else if (telephony.getNetworkType() == TelephonyManager.NETWORK_TYPE_EDGE) {
telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
// Toast.makeText(getBaseContext(), "if Clause : 05",
// Toast.LENGTH_SHORT).show();
return;
}
// Log.i(TAG, "onCreate: 08 ");
TelephonyManager teli = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOp = teli.getNetworkOperator();
CellInfoGsm cellinfogsm = (CellInfoGsm) telephonyManager.getAllCellInfo().get(0);
CellSignalStrengthGsm cellSignalStrengthGsm = cellinfogsm.getCellSignalStrength();
int ss = cellSignalStrengthGsm.getDbm();
TextView sst = (TextView) findViewById(R.id.rssi);
sst.setText("RSSI: " + ss + "dbm");
/* int lev = cellSignalStrengthGsm.getLevel();
TextView leve = (TextView) findViewById(R.id.levs);
leve.setText("Rx Quality:" + lev); */
int asul = cellSignalStrengthGsm.getAsuLevel();
TextView asu = (TextView) findViewById(R.id.asu2g);
asu.setText("ASU Level: " + asul);
TextView tech = (TextView) findViewById(R.id.tech);
tech.setText("Technology: 2G");
// Log.i(TAG, "onCreate: 08 ");
if (!TextUtils.isEmpty(networkOp)) {
int mcc = Integer.parseInt(networkOp.substring(0, 3));
int mnc = Integer.parseInt(networkOp.substring(3));
TextView mncc = (TextView) findViewById(R.id.mnc);
mncc.setText("MNC:" + mnc);
TextView mccc = (TextView) findViewById(R.id.mcc);
mccc.setText("MCC:" + mcc);
}
if (telephony.getPhoneType() == TelephonyManager.PHONE_TYPE_GSM) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
// Toast.makeText(getBaseContext(), "If Clause : 06",
// Toast.LENGTH_SHORT).show();
return;
}
final GsmCellLocation location = (GsmCellLocation) telephony.getCellLocation();
if (location != null) {
TextView lac = (TextView) findViewById(R.id.lac);
lac.setText("LAC: " + location.getLac());
TextView cid = (TextView) findViewById(R.id.cid);
cid.setText("CID: " + location.getCid());
}
}
}
TelephonyManager tel = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
String networkOperator1 = tel.getNetworkOperator();
String networkName = tel.getNetworkOperatorName();
TextView name = (TextView) findViewById(R.id.name);
name.setText("Operator: " + tel.getNetworkOperatorName());
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Check Permissions Now
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
0);
}
// Getting LocationManager object
statusCheck();
locationManager = (LocationManager) getSystemService(
Context.LOCATION_SERVICE);
// Creating an empty criteria object
Criteria criteria = new Criteria();
// Getting the name of the provider that meets the criteria
provider = locationManager.getBestProvider(criteria, false);
if (provider != null && !provider.equals("")) {
if (!provider.contains("gps")) { // if gps is disabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings",
"com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
// Get the location from the given provider
Location location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 500, 0, this);
if (location != null)
onLocationChanged(location);
else
location = locationManager.getLastKnownLocation(provider);
if (location != null)
onLocationChanged(location);
else
Toast.makeText(getBaseContext(), "Location can't be retrieved",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getBaseContext(), "No Provider Found",
Toast.LENGTH_SHORT).show();
}
}
public void statusCheck() {
final LocationManager manager = (LocationManager) getSystemService(
Context.LOCATION_SERVICE);
if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
buildAlertMessageNoGps();
}
}
private void buildAlertMessageNoGps() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(
"Your GPS seems to be disabled, do you want to enable it?")
.setCancelable(false).setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog,
final int id) {
startActivity(new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog,
final int id) {
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
/* getMenuInflater().inflate(R.menu.activity_main, menu); */
return true;
}
@Override
public void onLocationChanged(Location location) {
// Getting reference to TextView tv_longitude
TextView tvLongitude = (TextView) findViewById(R.id.longi1);
// Getting reference to TextView tv_latitude
TextView tvLatitude = (TextView) findViewById(R.id.lati1);
// Setting Current Longitude
tvLongitude.setText("Longitude: " + location.getLongitude());
// Setting Current Latitude
tvLatitude.setText("Latitude: " + location.getLatitude());
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// Check Permissions Now
ActivityCompat.requestPermissions(this,
new String[] { Manifest.permission.ACCESS_FINE_LOCATION },
0);
}
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
答案 0 :(得分：0)
因此，当您致电TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE)时，您需要检查instanceOf CellInfoLte。如果我关注您，那么您的类型转换CellInfoGsm到CellInfoLte这是不可行的。现在您需要检查您的tm.getAllCellInfo()是否有您的对象然后执行您的任务。
以下代码用于理解： -
try {
final TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
for (final CellInfo info : tm.getAllCellInfo()) {
if (info instanceof CellInfoGsm) {
final CellSignalStrengthGsm gsm = ((CellInfoGsm) info).getCellSignalStrength();
// do what you need
} else if (info instanceof CellInfoCdma) {
final CellSignalStrengthCdma cdma = ((CellInfoCdma) info).getCellSignalStrength();
// do what you need
} else if (info instanceof CellInfoLte) {
CellInfoLte cellInfoLte = (CellInfoLte) telephonyManager.getAllCellInfo().get(0);
// do what you need
} else {
throw new Exception("Unknown type of cell signal!");
}
}
} catch (Exception e) {
Log.e(TAG, "Unable to obtain cell signal information", e);
}