init程序的啟動流程，Android使用init.rc觸發腳本實現隱藏內置應用-技術動態-匯編語言學習筆記

init程序的啟動流程，Android使用init.rc觸發腳本實現隱藏內置應用

2023-11-18 阅读 23 评论 0

摘要：【實現邏輯】通過在property_service.c中設置標志位，在設置中實現接口改變標志位，使用init.rc中聲明的服務來偵聽標志位的變化，顯式啟動聲明的服務，執行對應的腳本，把應用后綴從apk重命名為bak，從而實現隱藏（顯示邏輯相反

【實現邏輯】通過在property_service.c中設置標志位，在設置中實現接口改變標志位，使用init.rc中聲明的服務來偵聽標志位的變化，顯式啟動聲明的服務，執行對應的腳本，把應用后綴從apk重命名為bak，從而實現隱藏（顯示邏輯相反）。
【實現步驟】以隱藏Google Play Store（system/priv-app/Phonesky.apk）為例： 1.首先在system/core/init/property_service.c中聲明并初始化標志位，0為隱藏，1為顯示，默認隱藏

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?????{ app.launcher.start, AID_SYSTEM, 0},
+?? { app.phonesky.show, AID_SYSTEM, 0}, //Add By zj
?????{ cdma.,??????? AID_RADIO,??? 0 },??? //Add by gfzhu VIA

2.在設置的開發者選項中實現對應的接口：文件路徑：packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java ①聲明和初始化：

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private static final String SHOW_PHONESKY = show_phonesky;
private CheckBoxPreference mShowPhonesky;
mShowPhonesky = findAndInitCheckboxPref(SHOW_PHONESKY);

②CheckBox的邏輯：

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???????(BatteryManager.BATTERY_PLUGGED_AC | BatteryManager.BATTERY_PLUGGED_USB) : 0);
+????? } else if (preference == mShowPhonesky) { // ZJ Add
+?????????? if(mShowPhonesky.isChecked())
+?????????? {
+????????????? SystemProperties.set(app.phonesky.show,1);
+?????????? }else{
+????????????? SystemProperties.set(app.phonesky.show,0);
+?????????? }
?????????} else if (preference == mBtHciSnoopLog) {

③增加一個Preference： packages/apps/Settings/res/xml/development_prefs.xml

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?????android:targetClass=com.android.settings.SetFullBackupPassword />
??????
+?????? <checkboxpreference android:key="show_phonesky" android:title="@string/show_phonesky">
?????<checkboxpreference pre="">
④添加對應語言的string字符：<pre class="brush:java;"><string name="show_phonesky">Show Google Play Store</string></pre>
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⑤設置中新增一個監聽，初始化Checkbox的邏輯： packages/apps/Settings/src/com/android/settings/BootReceiver.java 內容如下：
<pre class="brush:java;">package com.android.settings;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.SystemClock;
import android.util.Log;
import android.os.SystemProperties;
public class BootReceiver extends BroadcastReceiver{
?????@Override
?????public void onReceive(Context arg0, Intent arg1) {
??????????// TODO Auto-generated method stub
???????????
??????????String action = arg1.getAction();
??????????if(action.equals(Intent.ACTION_BOOT_COMPLETED))
??????????{ 
?????????????SharedPreferences shared = arg0.getSharedPreferences(com.android.settings_preferences, Context.MODE_PRIVATE);
?????????????boolean show_phonesky = shared.getBoolean(show_phonesky, false);
?????????????if(show_phonesky){
??????????????????SystemProperties.set(app.phonesky.show,1);???? 
???????????????}else{
????????????????????SystemProperties.set(app.phonesky.show,0);???? 
???????????????}
??????????}
?????}
}</pre>
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⑥在Settings的AndroidManifest文件中添加BroadcastReceiver的權限和聲明：
<pre class="brush:java;"><uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED/">
</uses-permission></pre>
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3.在init.rc中添加對應的服務和觸發條件： 路徑：mediatek/config/esky27_tb_ccn_mlc_kk/init.rc
<pre class="brush:java;">+# ZJ Add START
+#Hide or Show Google Play Dynamicly
+#disabled:服務不會自動運行，必須顯式地通過服務器來啟動。
+#oneshot:當此服務退出時不會自動重啟。
+service hidePhonesky /system/bin/hidePhonesky
+?????? disabled
+?????? oneshot??? 
+service showPhonesky /system/bin/showPhonesky
+?????? disabled
+?????? oneshot??? 
+#on property:sys.boot_completed=1
+#?? start renamePhonesky
+on property:app.phonesky.show=1
+?? start showPhonesky
+on property:app.phonesky.show=0
+?? start hidePhonesky
+# ZJ Add END</pre>
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4.隱藏和顯示應用的腳本： 隱藏應用：vendor/ThirdParty/App/dte/hidePhonesky 內容：<br>
<pre class="brush:java;">#!/system/bin/sh
#!/system/bin/busybox
mount -o remount,rw /system;
mv /system/priv-app/Phonesky.apk /system/priv-app/Phonesky.bak</pre>
<br>
顯示應用：vendor/ThirdParty/App/dte/showPhonesky<br>
內容：<br>
<pre class="brush:java;">#!/system/bin/sh
#!/system/bin/busybox
mount -o remount,rw /system;
mv /system/priv-app/Phonesky.bak /system/priv-app/Phonesky.apk</pre>
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5.拷貝腳本到system/bin目錄下： 參考以下格式添加到對應的mk文件：
<pre class="brush:java;">+#添加重命名GooglePlay腳本
+PRODUCT_COPY_FILES += 
+?????? vendor/ThirdParty/App/dte/hidePhonesky:system/bin/hidePhonesky 
+?????? vendor/ThirdParty/App/dte/showPhonesky:system/bin/showPhonesky 
+?????? vendor/ThirdParty/App/dte/Phonesky.bak:system/priv-app/Phonesky.bak</pre>
</checkboxpreference></checkboxpreference><br>
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