如果在拨出电话之前获得蜂窝塔强度，如果没有信号或没有足够的强度，它应该提示用户没有信号。
答案 0 :(得分：2)
请参阅此signalStrength ..这应该可以解决问题
答案 1 :(得分：0)
您好请使用以下代码希望它能解决您的问题
HomeActivity .java
// Android Packages
import android.app.Activity;
import android.os.Bundle;
import android.os.Build;
import android.os.AsyncTask;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Context;
import android.content.Intent;
import android.widget.TextView;
import android.widget.Button;
import android.telephony.SignalStrength;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.telephony.CellLocation;
import android.telephony.cdma.CdmaCellLocation;
import android.telephony.gsm.GsmCellLocation;
import android.widget.Toast;
import android.util.Log;
public final class HomeActivity extends Activity
{
public static final String TAG = HomeActivity.class.getSimpleName();
public static final String EMAIL = "tbarrasso@sevenplusandroid.org";
private CellLocation mCellLocation;
private SignalStrength mSignalStrength;
private boolean mDone = false;
private TextView mText = null;
private String mTextStr;
private Button mSubmit, mCancel;
private TelephonyManager mManager;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
mText = (TextView) findViewById(R.id.text);
mSubmit = (Button) findViewById(R.id.submit);
mCancel = (Button) findViewById(R.id.cancel);
// Prevent button press.
mSubmit.setEnabled(false);
// Handle click events.
mSubmit.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View mView)
{
sendResults();
finish();
}
});
mCancel.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View mView)
{
finish();
}
});
// Register the listener with the telephony manager
mManager.listen(mListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS |
PhoneStateListener.LISTEN_CELL_LOCATION);
}
// Listener for signal strength.
final PhoneStateListener mListener = new PhoneStateListener()
{
@Override
public void onCellLocationChanged(CellLocation mLocation)
{
if (mDone) return;
Log.d(TAG, "Cell location obtained.");
mCellLocation = mLocation;
update();
}
@Override
public void onSignalStrengthsChanged(SignalStrength sStrength)
{
if (mDone) return;
Log.d(TAG, "Signal strength obtained.");
mSignalStrength = sStrength;
update();
}
};
// AsyncTask to avoid an ANR.
private class ReflectionTask extends AsyncTask<Void, Void, Void>
{
protected Void doInBackground(Void... mVoid)
{
mTextStr =
("DEVICE INFO\n\n" + "SDK: `" + Build.VERSION.SDK_INT + "`\nCODENAME: `" +
Build.VERSION.CODENAME + "`\nRELEASE: `" + Build.VERSION.RELEASE +
"`\nDevice: `" + Build.DEVICE + "`\nHARDWARE: `" + Build.HARDWARE +
"`\nMANUFACTURER: `" + Build.MANUFACTURER + "`\nMODEL: `" + Build.MODEL +
"`\nPRODUCT: `" + Build.PRODUCT + ((getRadio() == null) ? "" : ("`\nRADIO: `" + getRadio())) +
"`\nBRAND: `" + Build.BRAND + ((Build.VERSION.SDK_INT >= 8) ? ("`\nBOOTLOADER: `" + Build.BOOTLOADER) : "") +
"`\nBOARD: `" + Build.BOARD + "`\nID: `"+ Build.ID + "`\n\n" +
ReflectionUtils.dumpClass(SignalStrength.class, mSignalStrength) + "\n" +
ReflectionUtils.dumpClass(mCellLocation.getClass(), mCellLocation) + "\n" + getWimaxDump() +
ReflectionUtils.dumpClass(TelephonyManager.class, mManager) +
ReflectionUtils.dumpStaticFields(Context.class, getApplicationContext()));
return null;
}
protected void onProgressUpdate(Void... progress)
{
// Do nothing...
}
protected void onPostExecute(Void result)
{
complete();
}
}
private final void complete()
{
mDone = true;
try
{
mText.setText(mTextStr);
// Stop listening.
mManager.listen(mListener, PhoneStateListener.LISTEN_NONE);
Toast.makeText(getApplicationContext(), R.string.done, Toast.LENGTH_SHORT).show();
mSubmit.setEnabled(true);
}
catch (Exception e)
{
Log.e(TAG, "ERROR!!!", e);
}
}
private final void update()
{
if (mSignalStrength == null || mCellLocation == null) return;
final ReflectionTask mTask = new ReflectionTask();
mTask.execute();
}
/**
* @return The Radio of the {@link Build} if available.
*/
public static final String getRadio()
{
if (Build.VERSION.SDK_INT >= 8 && Build.VERSION.SDK_INT < 14)
return Build.RADIO;
else if (Build.VERSION.SDK_INT >= 14)
return Build.getRadioVersion();
else
return null;
}
private static final String[] mServices =
{
"WiMax", "wimax", "wimax", "WIMAX", "WiMAX"
};
/**
* @return A String containing a dump of any/ all WiMax
* classes/ services loaded via {@link Context}.
*/
public final String getWimaxDump()
{
String mStr = "";
for (final String mService : mServices)
{
final Object mServiceObj = getApplicationContext()
.getSystemService(mService);
if (mServiceObj != null)
{
mStr += "getSystemService(" + mService + ")\n\n";
mStr += ReflectionUtils.dumpClass(mServiceObj.getClass(), mServiceObj);
}
}
return mStr;
}
/**
* Start an {@link Intent} chooser for the user to submit the results.
*/
public final void sendResults()
{
final Intent mIntent = new Intent(Intent.ACTION_SEND);
mIntent.setType("plain/text");
mIntent.putExtra(Intent.EXTRA_EMAIL, new String[] { EMAIL });
mIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.results));
mIntent.putExtra(Intent.EXTRA_TEXT, mTextStr);
HomeActivity.this.startActivity(Intent.createChooser(mIntent, "Send results."));
}
}
ReflectionUtils.java
import java.lang.reflect.*;
import android.util.Log;
public final class ReflectionUtils
{
public static final String TAG = ReflectionUtils.class.getSimpleName();
/**
* Dumps a {@link Class}'s {@link Method}s and {@link Field}s
* as a String.
*/
public static final String dumpClass(Class<?> mClass, Object mInstance)
{
if (mClass == null || mInstance == null) return null;
String mStr = mClass.getSimpleName() + "\n\n";
mStr += "FIELDS\n\n";
final Field[] mFields = mClass.getDeclaredFields();
for (final Field mField : mFields)
{
mField.setAccessible(true);
mStr += mField.getName() + " (" + mField.getType() + ") = ";
try
{
mStr += mField.get(mInstance).toString();
}
catch (Exception e)
{
mStr += "null";
Log.e(TAG, "Could not get Field `" + mField.getName() + "`.", e);
}
mStr += "\n";
}
mStr += "METHODS\\nn";
// Dump all methods.
final Method[] mMethods = mClass.getMethods();
for (final Method mMethod : mMethods)
{
mMethod.setAccessible(true);
mStr += mMethod.getReturnType() + " " + mMethod.getName() + "() = ";
try
{
final Object mRet = mMethod.invoke(mInstance);
mStr += (mRet == null) ? "null" : mMethod.invoke(mInstance).toString();
}
catch (Exception e)
{
mStr += "null";
Log.e(TAG, "Could not get Method `" + mMethod.getName() + "`.", e);
}
mStr += "\n";
}
return mStr;
}
/**
* @return A string containing the values of all static {@link Field}s.
*/
public static final String dumpStaticFields(Class<?> mClass, Object mInstance)
{
if (mClass == null || mInstance == null) return null;
String mStr = mClass.getSimpleName() + "\n\n";
mStr += "STATIC FIELDS\n\n";
final Field[] mFields = mClass.getDeclaredFields();
for (final Field mField : mFields)
{
if (ReflectionUtils.isStatic(mField))
{
mField.setAccessible(true);
mStr += mField.getName() + " (" + mField.getType() + ") = ";
try
{
mStr += mField.get(mInstance).toString();
}
catch (Exception e)
{
mStr += "null";
Log.e(TAG, "Could not get Field `" + mField.getName() + "`.", e);
}
mStr += "\n";
}
}
return mStr;
}
/**
* @return True if the {@link Field} is static.
*/
public final static boolean isStatic(Field field)
{
final int modifiers = field.getModifiers();
return (Modifier.isStatic(modifiers));
}
}
main.xml中
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@android:color/black"
android:padding="8dp"
android:id="@+id/root">
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="56dp"
android:fillViewport="true">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/text"
android:textColor="@android:color/white" />
</LinearLayout>
</ScrollView>
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:stretchColumns="0,1">
<TableRow
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/cancel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/cancel"
android:textColor="@android:color/white"/>
<Button
android:id="@+id/submit"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/submit"
android:textColor="@android:color/white"/>
</TableRow>
</TableLayout>
</RelativeLayout>
不要忘记使用以下功能和权限
<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
<uses-feature android:name="android.hardware.location" android:required="false" />
<uses-feature android:name="android.hardware.location.network" android:required="false" />
<uses-feature android:name="android.hardware.location.gps" android:required="false" />
<uses-feature android:name="android.hardware.telephony" android:required="false" />
<uses-permission android:name="android.permission.ACCESS_WIMAX_STATE" android:required="false" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" android:required="false" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" android:required="false" />