Android getAllCellInfo () returns null
I am new to android and I am working on a project that collects all cell information that is observed over the phone. I used method TelephonyManager.getAllCellInfo()
but it always returns null
.
My code ::
public class NetworkCoverageActivity extends AppCompatActivity {
private String str;
private TextView TV;
private Button getCellsInfoBtn;
private TelephonyManager TM;
private List<CellInfo> cellInfoList;
private PhoneStateListener PSL;
private int event;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_network_coverage);
TV = (TextView)findViewById(R.id.iv);
getCellsInfoBtn = (Button)findViewById(R.id.getCellsInfoBtn);
TM = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
PSL = new PhoneStateListener();
event = PSL.LISTEN_CELL_INFO | PSL.LISTEN_CELL_LOCATION;
getCellsInfoBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
TM.listen(PSL, event);
cellInfoList = TM.getAllCellInfo();
if(cellInfoList != null)
TV.append("cellInfoList = null");
else{
...
}
}
});
}
I am working on android 4.4.2 level 17 and setting the minimum API level to 17. And I am trying to gather information from the GSM network.
Also, I added the following permission AndroidManifest.xml
:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
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I have a solution to my question. which replaced function getAllCellInfo()
with function getNeighboringCellInfo()
, although I am working with android level 17 which should support the function getAllCellInfo()
and the function is getNeighboringCellInfo()
no longer supported. Either way, this is the solution.
package ayad.bslm.com.networkcoverage;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.NeighboringCellInfo;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.List;
public class NetworkCoverageActivity extends AppCompatActivity {
private TextView TV;
private TelephonyManager TM;
private List<NeighboringCellInfo> neighboringCellInfoList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_network_coverage);
TV = (TextView)findViewById(R.id.iv);
Button getCellsInfoBtn = (Button)findViewById(R.id.getCellsInfoBtn);
TM = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
getCellsInfoBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
neighboringCellInfoList = TM.getNeighboringCellInfo();
if(neighboringCellInfoList == null)
TV.setText("neighboringCellInfoList == null\n");
else
TV.setText("There are " + neighboringCellInfoList.size() + " Cells\n");
}
});
}
}
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