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上一篇文章中讲到android源码定制要点，说了个大概的方法和方向，现在，就来实战一下。
在Android系统中，长按Power键默认会弹出对话框让你选择“飞行模式”，“静音”，“关机”等功能。如下图所示：
但这些功能都对Android-x86和其他终端产品就没什么必要了。本文就简单介绍下如何定制关机界面。
我的目标是长按Power键，将会关机，弹出“设备将要关机”选择对话框。如果可以选择“是”关机，和“否”返回系统。
按照android源码定制要点中提到的，首先你要对整个系统有全面的了解，找到弹出原来这个选择框的代码，它在这里：
frameworkspoliciesbasephonecomandroidinternalpolicyimplPhoneWindowManager.java
显示对话框调用的代码如下：
- Java code
Runnable mPowerLongPress = new Runnable() {
public void run() {
mShouldTurnOffOnKeyUp = false;
performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
showGlobalActionsDialog();
}
};
调用showGlobalActionsDialog方法之后将会聚到有“飞行模式”、“静音”、“关机”等选项的对话框。
找到这里，我们就知道该做什么了！干掉它，换成我们想要的关机代码，就大功告成了！既然这样，事不宜迟，让我们赶快到showGloabalActionDialog方法中看看关机的部分在哪里！
showGlobalActionsDialog的实现部分在这里：
view plain
frameworkspoliciesbasephonecomandroidinternalpolicyimplGlobalAction.java
我们进去看看：
- Java code
public void showDialog(boolean keyguardShowing, boolean isDeviceProvisioned) {
mKeyguardShowing = keyguardShowing;
mDeviceProvisioned = isDeviceProvisioned;
if (mDialog == null) {
mStatusBar = (StatusBarManager)mContext.getSystemService(Context.STATUS_BAR_SERVICE);
mDialog = createDialog();
}
prepareDialog();
mStatusBar.disable(StatusBarManager.DISABLE_EXPAND);
mDialog.show();
}
我们可以很清楚的看到，这里新建了一个mDialog，然后prepare接着就show了它，那么，这个mDialog就是关键了，看看它是怎么被createDialog创建出来的吧，仍然在这个文件中：
- Java code
/**
* Create the global actions dialog.
* @return A new dialog.
*/
private AlertDialog createDialog() {
mSilentModeToggle = new ToggleAction(
R.drawable.ic_lock_silent_mode,
R.drawable.ic_lock_silent_mode_off,
R.string.global_action_toggle_silent_mode,
R.string.global_action_silent_mode_on_status,
R.string.global_action_silent_mode_off_status) {
void willCreate() {
// XXX: FIXME: switch to ic_lock_vibrate_mode when available
mEnabledIconResId = (Settings.System.getInt(mContext.getContentResolver(),
Settings.System.VIBRATE_IN_SILENT, 1) == 1)
? R.drawable.ic_lock_silent_mode_vibrate
: R.drawable.ic_lock_silent_mode;
}
void onToggle(boolean on) {
if (on) {
mAudioManager.setRingerMode((Settings.System.getInt(mContext.getContentResolver(),
Settings.System.VIBRATE_IN_SILENT, 1) == 1)
? AudioManager.RINGER_MODE_VIBRATE
: AudioManager.RINGER_MODE_SILENT);
} else {
mAudioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
}
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return false;
}
};
mAirplaneModeOn = new ToggleAction(
R.drawable.ic_lock_airplane_mode,
R.drawable.ic_lock_airplane_mode_off,
R.string.global_actions_toggle_airplane_mode,
R.string.global_actions_airplane_mode_on_status,
R.string.global_actions_airplane_mode_off_status) {
void onToggle(boolean on) {
if (Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
mIsWaitingForEcmExit = true;
// Launch ECM exit dialog
Intent ecmDialogIntent =
new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null);
ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(ecmDialogIntent);
} else {
changeAirplaneModeSystemSetting(on);
}
}
@Override
protected void changeStateFromPress(boolean buttonOn) {
// In ECM mode airplane state cannot be changed
if (!(Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
mState = buttonOn ? State.TurningOn : State.TurningOff;
mAirplaneState = mState;
}
}
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return false;
}
};
mItems = Lists.newArrayList(
// silent mode
mSilentModeToggle,
// next: airplane mode
mAirplaneModeOn,
// last: power off
new SinglePressAction(
com.android.internal.R.drawable.ic_lock_power_off,
R.string.global_action_power_off) {
[color=#0000FF]public void onPress() {
// shutdown by making sure radio and power are handled accordingly.
ShutdownThread.shutdown(mContext, true);
} [/color]
public boolean showDuringKeyguard() {
return true;
}
public boolean showBeforeProvisioning() {
return true;
}
});
mAdapter = new MyAdapter();
final AlertDialog.Builder ab = new AlertDialog.Builder(mContext);
ab.setAdapter(mAdapter, this)
.setInverseBackgroundForced(true)
.setTitle(R.string.global_actions);
final AlertDialog dialog = ab.create();
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
if (!mContext.getResources().getBoolean(
com.android.internal.R.bool.config_sf_slowBlur)) {
dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
}
dialog.setOnDismissListener(this);
return dialog;
}