Check Internet connection Android example
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public boolean isConnected() {
try {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("isConnected", e.getMessage());
Toast.makeText(getApplicationContext(), e.getMessage(),
Toast.LENGTH_LONG).show();
return false;
}
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If You create new xml file with prefix _ , for example _style.xml and You to clean project (Project->Clean), than package in folder project\gen will deleted with R.java class and new R.java not be created.
For to solving this problem You have to rename file without prefix _ as style.xml or name what You need and rebuild project.
If some ID cannot be resolved or is not a field get error occurence
You have to delete import android.R; in Activity.class if was inserted,
when this error is displayed.
For to solving this problem You have to rename file without prefix _ as style.xml or name what You need and rebuild project.
If some ID cannot be resolved or is not a field get error occurence
You have to delete import android.R; in Activity.class if was inserted,
when this error is displayed.
int nf = Math.round(5.789f);
System.out.print(nf); // 6
float f = 28.611f;
int n3 = Math.round(f);
System.out.println(n3); // 29
double d = 1234.56;
long lon = Math.round(d);
System.out.println(lon); // 1235
int diff = 90 - 40;
// float fDeleni = diff / 10; // error code
float fDeleni = (float)diff / 10.f; // ok
int nRound = Math.round(fDeleni);
// Caution:
int n2 = (int) 8.999f;
System.out.println(n2); // 8
| Brand | Samsung |
| Model (codename) | Galaxy Y (S5360) |
| Cena, včetně DPH | 2400 / 06.2012 |
| Display size (v palcích) | 3 |
| Display-resolution | 240x320 |
| Dotek-typ | kapacitní |
| CPU typ | BCM21553 |
| CPU MHz | 832 |
| CPU core | |
| L2 cache | ? |
| RAM | 256 |
| ROM | 512 |
| GPU | VideoCore IV |
| NenaMark2 Benchmark | 12 |
| GPU-GLBenchmark | |
| Baterie mAh | 1200 |
| Foto MPx | 2 |
| Autofocus | ne |
| Video | |
| Official Android ICS | Android OS v 2.3 |
| CyanogenMod support | |
| Dotek-prstů-max | |
| Display-ppi | 133 |
| Display-retina | 41% |
| Network | čîtyřpásmový GSM 850/900/1800/1900 MHz , HSDPA 2100 MHz |
| Connectivity | Bluetooth v2.0 plus EDR plus support A2DP, USB host |
| Pozn. | CPU ARMv6, GPU 20MT/s OpenGL ES 2.0 |
Drawable dr = getResources().getDrawable(R.drawable.algebra);
int h = dr.getIntrinsicHeight();
int w = dr.getIntrinsicWidth();
Bitmap ball = BitmapFactory.decodeResource(getResources(), R.drawable.algebra);
int _nWidth = ball.getWidth();
int _nHeight = ball.getHeight();
If you do click on Rebuid project menu item, this operation maybe consume long time on slovly PC.
Some errors dismis when you do rebuild project, or module.
Try this:
Select module where contains red error code and press Debugg or Run button on Android Studio.
If module code contains errors, Android Studio show error report in gradle console.
If not, apk will installed on device.
This is 10 times faster than Clean - Rebuild all project.
Some errors dismis when you do rebuild project, or module.
Try this:
Select module where contains red error code and press Debugg or Run button on Android Studio.
If module code contains errors, Android Studio show error report in gradle console.
If not, apk will installed on device.
This is 10 times faster than Clean - Rebuild all project.
Editace: 2011-11-19 21:15:12
Počet článků v kategorii: 397
Url:check-internet-connection-android-example
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