Android 信号强度显示图标修改

找了一找，显示信号对应的图片是：

stat_sys_signal_null.png

查找一下这个图片在其它地方有没有：

1 root@i3:~# cd frameworks/
2 root@i3:frameworks# find -name stat_sys_signal_null.png
3 ./base/docs/html/images/icon_design/stat_sys_signal_null.png
4 ./base/core/res/res/drawable-mdpi/stat_sys_signal_null.png
5 ./base/core/res/res/drawable-hdpi/stat_sys_signal_null.png

再找找哪里用到了这个图片：

1 root@i3:frameworks# grep -r stat_sys_signal_null ./
2 ./base/services/java/com/android/server/status/StatusBarPolicy.java:                null, com.android.internal.R.drawable.stat_sys_signal_null, 0, 0);
3 ./base/services/java/com/android/server/status/StatusBarPolicy.java:                mPhoneData.iconId = com.android.internal.R.drawable.stat_sys_signal_null;

找到了两处，其实是同一个文件，打开来看看吧：

01 private final void updateSignalStrength() {
02     int iconLevel = -1;
03     int[] iconList;
04
05     // Display signal strength while in "emergency calls only" mode
06     if (!hasService() && !mServiceState.isEmergencyOnly()) {
07         //Slog.d(TAG, "updateSignalStrength: no service");
08         if (Settings.System.getInt(mContext.getContentResolver(),
09                 Settings.System.AIRPLANE_MODE_ON, 0) == 1) {
10             mPhoneData.iconId = com.android.internal.R.drawable.stat_sys_signal_flightmode;
11         } else if( mModemPowerState == ModemPowerTracker.PowerState.TURNED_ON ) {
12             mPhoneData.iconId = com.android.internal.R.drawable.stat_sys_signal_init;
13         } else {
14             mPhoneData.iconId = com.android.internal.R.drawable.stat_sys_signal_null;
15         }
16         mService.updateIcon(mPhoneIcon, mPhoneData, null);
17         return;
18     }

这处代码看起来像是3G信号。

1 // phone_signal
2 mPhone = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
3 mPhoneData = IconData.makeIcon("phone_signal",
4         null, com.android.internal.R.drawable.stat_sys_signal_null, 0, 0);
5 mPhoneIcon = service.addIcon(mPhoneData, null);

这个应该是电话信号了。