在androi中手机信号信息的获取可以通过系统提供的TELEPHONY_SERVICE获取
[java]
TelephonyManager tel = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
TelephonyManager 可以监听 PhoneStateListener， PhoneStateListener 提供了
[java]
onSignalStrengthsChanged手机信号变动
onServiceStateChanged手机服务状态变动
其中onSignalStrengthsChanged可以获取到的有用信息如下：
[java]
/*
signalStrength.isGsm()是否GSM信号 2G or 3G
signalStrength.getCdmaDbm();联通3G 信号强度
signalStrength.getCdmaEcio();联通3G 载干比
signalStrength.getEvdoDbm();电信3G 信号强度
signalStrength.getEvdoEcio();电信3G 载干比
signalStrength.getEvdoSnr();电信3G 信噪比
signalStrength.getGsmSignalStrength();2G 信号强度
signalStrength.getGsmBitErrorRate();2G 误码率
载干比 ，它是指空中模拟电波中的信号与噪声的比值
*/
奇怪的是移动的3G信号TD-SCDMA 信息没办法获取到
而onServiceStateChanged 提供的状态变动如下：
[java]
/*
ServiceState.STATE_EMERGENCY_ONLY仅限紧急呼叫
ServiceState.STATE_IN_SERVICE信号正常
ServiceState.STATE_OUT_OF_SERVICE不在服务区
ServiceState.STATE_POWER_OFF断电
*/
以下给出具体的实例：
1.在布局文件中增加一个3G图标，和显示具体信息的文本（activity_g3_example.xml）
[html]
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<ImageButton
android:id="@+id/Icon_3GStatus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_3g"/>
<TextView
android:id="@+id/Label_3GDetail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="320dp"/>
</LinearLayout>
2. 为3G图标添加一组可选的图标，在drawable-hdpi目录下增加ic_3g.xml文件，内容如下：
[html]
<?xml version="1.0" encoding="utf-8"?>
<level-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:maxLevel="60"android:drawable="@drawable/ic_3g_s3" />
<item android:maxLevel="90"android:drawable="@drawable/ic_3g_s2" />
<item android:maxLevel="96"android:drawable="@drawable/ic_3g_s1" />
<item android:maxLevel="100" android:drawable="@drawable/ic_3g_s0" />
</level-list>
注意需要导入用到的图片
3.在代码中监听手机信号和状态的变动(G3Example.java)
[java]
package com.example.g3example;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.Menu;
import android.widget.ImageButton;
import android.widget.TextView;
public class G3Example extends Activity {
private final String TAG = "G3Example";
private ImageButtonmIcon3G;
private TextViewmLabel3G;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_g3_example);
mIcon3G= (ImageButton)findViewById(R.id.Icon_3GStatus);
mLabel3G = (TextView)findViewById(R.id.Label_3GDetail);
TelephonyManager tel = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
tel.listen(new PhoneStateMonitor(), PhoneStateListener.LISTEN_SIGNAL_STRENGTHS | PhoneStateListener.LISTEN_SERVICE_STATE);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_g3_example, menu);
return true;
}
public class PhoneStateMonitor extends PhoneStateListener{
public void onSignalStrengthsChanged(SignalStrength signalStrength) {
super.onSignalStrengthsChanged(signalStrength);
/*
signalStrength.isGsm()是否GSM信号 2G or 3G
signalStrength.getCdmaDbm();联通3G 信号强度
signalStrength.getCdmaEcio();联通3G 载干比
signalStrength.getEvdoDbm();电信3G 信号强度
signalStrength.getEvdoEcio();电信3G 载干比
signalStrength.getEvdoSnr();电信3G 信噪比
signalStrength.getGsmSignalStrength();2G 信号强度
signalStrength.getGsmBitErrorRate();2G 误码率
载干比 ，它是指空中模拟电波中的信号与噪声的比值
*/
mLabel3G.setText("IsGsm : " + signalStrength.isGsm() +
"\nCDMA Dbm : " + signalStrength.getCdmaDbm() + "Dbm" +
"\nCDMA Ecio : " + signalStrength.getCdmaEcio() +"dB*10" +
"\nEvdo Dbm : " + signalStrength.getEvdoDbm() + "Dbm" +
"\nEvdo Ecio : " + signalStrength.getEvdoEcio() + "dB*10" +
"\nGsm SignalStrength : " + signalStrength.getGsmSignalStrength() +
"\nGsm BitErrorRate : " + signalStrength.getGsmBitErrorRate());
mIcon3G.setImageLevel(Math.abs(signalStrength.getGsmSignalStrength()));
}
public void onServiceStateChanged(ServiceState serviceState){
super.onServiceStateChanged(serviceState);
/*
ServiceState.STATE_EMERGENCY_ONLY仅限紧急呼叫
ServiceState.STATE_IN_SERVICE信号正常
ServiceState.STATE_OUT_OF_SERVICE不在服务区
ServiceState.STATE_POWER_OFF断电
*/
switch(serviceState.getState())
{
case ServiceState.STATE_EMERGENCY_ONLY:
Log.d(TAG, "3G STATUS : STATE_EMERGENCY_ONLY");
break;
case ServiceState.STATE_IN_SERVICE:
Log.d(TAG, "3G STATUS : STATE_IN_SERVICE");
break;
case ServiceState.STATE_OUT_OF_SERVICE:
Log.d(TAG, "3G STATUS : STATE_OUT_OF_SERVICE");
break;
case ServiceState.STATE_POWER_OFF:
Log.d(TAG, "3G STATUS : STATE_POWER_OFF");
break;
default:
break;
}
}
}
}
4. 最后在AndroidManifest.xml增加获取手机信号权限的支持
[html] view plaincopy
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
