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阅读5分钟，每日十点、和您一起终身学习，这里是程序员Android
本篇文章主要介绍 Android 开发中的部分知识点，通过阅读本篇文章，您将收获以下内容:
一、实现效果
二、主要实现思路
三、主要实现代码
四、在Framework 层添加资源的方法
一、实现效果
仿华为USB Mode弹窗实现效果如下：
二、主要实现思路
主要实现思路如下：
在手机连接USB发送/取消通知的同时，控制弹窗Dialog 的显示/消失。
三、主要实现代码
连接USB发送/取消通知主要实现是在UsbDeviceManager.java类中,类路径如下：
frameworksaseservicesusbjavacomandroidserverusbUsbDeviceManager.java，通过查看此类代码，实现想要的功能。
修改实现代码如下：
// add start by wj for usb mode
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.view.WindowManager;
import android.view.Gravity;
// add end by wj for usb mode
/**
* UsbDeviceManager manages USB state in device mode.
*/
public class UsbDeviceManager implements ActivityManagerInternal.ScreenObserver {
private static final String TAG = UsbDeviceManager.class.getSimpleName();
... ...
// add start by wj for usb mode
private static UsbHandler mHandler;
private static AlertDialog mServiceDialog = null;
// add end by wj for usb mode
... ...
protected void updateUsbNotification(boolean force) {
if (mNotificationManager == null || !mUseUsbNotification
|| ("0".equals(getSystemProperty("persist.charging.notify", "")))) {
return;
}
// Dont show the notification when connected to a USB peripheral
// and the link does not support PR_SWAP and DR_SWAP
if (mHideUsbNotification && !mSupportsAllCombinations) {
if (mUsbNotificationId != 0) {
mNotificationManager.cancelAsUser(null, mUsbNotificationId,
UserHandle.ALL);
mUsbNotificationId = 0;
Slog.d(TAG, "Clear notification");
}
return;
}
int id = 0;
int titleRes = 0;
Resources r = mContext.getResources();
CharSequence message = r.getText(
com.android.internal.R.string.usb_notification_message);
if (mAudioAccessoryConnected && !mAudioAccessorySupported) {
titleRes = com.android.internal.R.string.usb_unsupported_audio_accessory_title;
id = SystemMessage.NOTE_USB_AUDIO_ACCESSORY_NOT_SUPPORTED;
} else if (mConnected) {
if (mCurrentFunctions == UsbManager.FUNCTION_MTP) {
titleRes = com.android.internal.R.string.usb_mtp_notification_title;
id = SystemMessage.NOTE_USB_MTP;
} else if (mCurrentFunctions == UsbManager.FUNCTION_PTP) {
titleRes = com.android.internal.R.string.usb_ptp_notification_title;
id = SystemMessage.NOTE_USB_PTP;
} else if (mCurrentFunctions == UsbManager.FUNCTION_MIDI) {
titleRes = com.android.internal.R.string.usb_midi_notification_title;
id = SystemMessage.NOTE_USB_MIDI;
} else if (mCurrentFunctions == UsbManager.FUNCTION_RNDIS) {
titleRes = com.android.internal.R.string.usb_tether_notification_title;
id = SystemMessage.NOTE_USB_TETHER;
} else if (mCurrentFunctions == UsbManager.FUNCTION_ACCESSORY) {
titleRes = com.android.internal.R.string.usb_accessory_notification_title;
id = SystemMessage.NOTE_USB_ACCESSORY;
}
if (mSourcePower) {
if (titleRes != 0) {
message = r.getText(
com.android.internal.R.string.usb_power_notification_message);
} else {
titleRes = com.android.internal.R.string.usb_supplying_notification_title;
id = SystemMessage.NOTE_USB_SUPPLYING;
}
} else if (titleRes == 0) {
titleRes = com.android.internal.R.string.usb_charging_notification_title;
id = SystemMessage.NOTE_USB_CHARGING;
}
} else if (mSourcePower) {
titleRes = com.android.internal.R.string.usb_supplying_notification_title;
id = SystemMessage.NOTE_USB_SUPPLYING;
} else if (mHostConnected && mSinkPower && mUsbCharging) {
titleRes = com.android.internal.R.string.usb_charging_notification_title;
id = SystemMessage.NOTE_USB_CHARGING;
}
if (id != mUsbNotificationId || force) {
// clear notification if title needs changing
if (mUsbNotificationId != 0) {
mNotificationManager.cancelAsUser(null, mUsbNotificationId,
UserHandle.ALL);
Slog.d(TAG, "Clear notification");
mUsbNotificationId = 0;
// add start by wj for usb mode
if (mServiceDialog != null) {
mServiceDialog.dismiss();
mServiceDialog=null;
}
// add start by wj for usb mode
.... ...
}
}
protected void updateAdbNotification(boolean force) {
if (mNotificationManager == null) return;
final int id = SystemMessage.NOTE_ADB_ACTIVE;
final int titleRes = com.android.internal.R.string.adb_active_notification_title;
if (mAdbEnabled && mConnected) {
if ("0".equals(getSystemProperty("persist.adb.notify", ""))) return;
if (force && mAdbNotificationShown) {
mAdbNotificationShown = false;
mNotificationManager.cancelAsUser(null, id, UserHandle.ALL);
}
if (!mAdbNotificationShown) {
Resources r = mContext.getResources();
CharSequence title = r.getText(titleRes);
CharSequence message = r.getText(
com.android.internal.R.string.adb_active_notification_message);
Intent intent = new Intent(Settings.ACTION_APPLICATION_DEVELOPMENT_SETTINGS);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pi = PendingIntent.getActivityAsUser(mContext, 0,
intent, 0, null, UserHandle.CURRENT);
Notification notification =
new Notification.Builder(mContext, SystemNotificationChannels.DEVELOPER)
.setSmallIcon(com.android.internal.R.drawable.stat_sys_adb)
.setWhen(0)
.setOngoing(true)
.setTicker(title)
.setDefaults(0) // please be quiet
.setColor(mContext.getColor(
com.android.internal.R.color
.system_notification_accent_color))
.setContentTitle(title)
.setContentText(message)
.setContentIntent(pi)
.setVisibility(Notification.VISIBILITY_PUBLIC)
.extend(new Notification.TvExtender()
.setChannelId(ADB_NOTIFICATION_CHANNEL_ID_TV))
.build();
mAdbNotificationShown = true;
mNotificationManager.notifyAsUser(null, id, notification,
UserHandle.ALL);
// add start by wj for usb mode
final String USBModeStr[] = mContext.getResources().getStringArray(com.android.internal.R.array.spro_usb_mode);
AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle(mContext.getResources().getString(com.android.internal.R.string.usb_mode_tittle));
builder.setSingleChoiceItems(USBModeStr, 0,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
Slog.e(TAG, "------USBModeStr[which]--------"+USBModeStr[which]);
dialog.dismiss();
switch (which) {
case 1:
mHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, UsbManager.FUNCTION_MTP);
break;
case 2:
mHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, UsbManager.FUNCTION_PTP);
break;
default:
mHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, UsbManager.FUNCTION_NONE);
break;
}
}
});
builder.setPositiveButton(mContext.getResources().getString(com.android.internal.R.string.usb_mode_cancel),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
mServiceDialog = builder.create();
mServiceDialog.getWindow().setType(
WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY);
mServiceDialog.getWindow().setGravity(Gravity.BOTTOM);
if (mServiceDialog != null && !mServiceDialog.isShowing()) {
mServiceDialog.show();
}
// add start by wj for usb mode
}
} else if (mAdbNotificationShown) {
mAdbNotificationShown = false;
mNotificationManager.cancelAsUser(null, id, UserHandle.ALL);
}
}
}
四、在Framework 层添加资源的方法
三种USB Mode 的资源需要在Framework资源文件中添加。
在Framework中添加资源的方案如下：
1. 添加strings 资源
字符串需要多语言支持，一般建议至少支持英文 、中文。
添加英文资源
英文主要修改values文件下的strings.xml，
路径如下：frameworksasecore
es
esvaluesstrings.xml
添加内容如下：
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
... ...
<!--start usb mode by wj-->
<string name="usb_mode_tittle">Use USB for</string>
<string name="usb_mode_charging_only">Charging only</string>
<string name="usb_mode_mtp">File Transfer(MTP)</string>
<string name="usb_mode_ptp">Transfer Photos(PTP)</string>
<string name="usb_mode_cancel">Cancel</string>
<!--end usb mode by wj-->
... ...
</resources>
添加中文资源
中文主要修改values-zh-rCN文件下的strings.xml，
修改路径如下：
frameworksasecore
es
esvalues-zh-rCNstrings.xml
添加内容如下：
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
... ...
<!--start usb mode by wj-->
<string name="usb_mode_tittle">USB 用途</string>
<string name="usb_mode_charging_only">仅限充电</string>
<string name="usb_mode_mtp">传输文件(MTP)</string>
<string name="usb_mode_ptp">传输照片(PTP)</string>
<string name="usb_mode_cancel">取消</string>
<!--end usb mode by wj-->
... ...
</resources>
2.添加引用的数组资源
因为3种 USB mode，引用了数组资源，所以需要在Framework层添加数组资源。
在Framework中添加数组主要修改values下arrays.xml文件frameworksasecore
es
esvaluesarrays.xml
添加内容如下：
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
... ...
<!--start usb mode by wj-->
<string-array name="spro_usb_mode">
<item>@string/usb_mode_charging_only</item>
<item>@string/usb_mode_mtp</item>
<item>@string/usb_mode_ptp</item>
</string-array>
<!--end usb mode by wj-->
... ...
</resources>
3.修改Framwork 资源，需要添加symbol，否则无法引用
在Framework中添加资源后，由于无法像Eclipse或者Androd Studio那样自动生成R.java文件，需要在symbols.xml文件中手动添加自己的资源文件名，否则会导致无法根据com.android.internal.R.**引用所需的字符串资源。
symbols.xml主要在valuse文件夹下，详细路径为frameworksasecore
es
esvaluessymbols.xml
添加内容如下：
<resources>
... ...
<!--start usb mode by wj-->
<java-symbol type="string" name="usb_mode_tittle" />
<java-symbol type="string" name="usb_mode_charging_only" />
<java-symbol type="string" name="usb_mode_mtp" />
<java-symbol type="string" name="usb_mode_ptp" />
<java-symbol type="string" name="usb_mode_cancel" />
<java-symbol type="array" name="spro_usb_mode" />
<!--end usb mode by wj-->
... ...
</resources>
至此，本篇已结束，如有不对的地方，欢迎您的建议与指正。同时期待您的关注，感谢您的阅读，谢谢！
