Android 源码添加长按电源键重启功能

悠悠 2022-10-29 07:36 345阅读 0赞

### 1. 前言 ###

`Android 6.0`源码编译出来的系统中，没有长按电源键后显示重启按钮的功能，因此需要我们修改添加一下。

### 2. 分析 ###

可参照关机的流程顺藤摸瓜，比葫芦画瓢添加重启功能。  
下面列一下需要修改的文件：

# 需要修改的文件
    frameworks/base/core/res/res/values/strings.xml
    frameworks/base/core/res/res/values/config.xml
    frameworks/base/core/res/res/values-zh-rCN/strings.xml
    frameworks/base/core/res/res/values/public.xml
    frameworks/base/core/res/res/values/symbols.xml
    frameworks/base/core/res/res/drawable/ic_lock_power_reboot.xml
    frameworks/base/services/core/java/com/android/server/policy/GlobalActions.java
    frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java
    
    # 需要添加的文件，及重启图标，网上搜索一个即可，注意要添加不同分辨率的图标
    frameworks/base/core/res/res/drawable-xxhdpi/ic_lock_power_reboot_alpha.png
    frameworks/base/core/res/res/drawable-xhdpi/ic_lock_power_reboot_alpha.png
    frameworks/base/core/res/res/drawable-mdpi/ic_lock_power_reboot_alpha.png
    frameworks/base/core/res/res/drawable-ldpi/ic_lock_power_reboot_alpha.png
    frameworks/base/core/res/res/drawable-hdpi/ic_lock_power_reboot_alpha.png
    
    # api更新文件, 在framework/base/core中添加、修改了东西
    # 因此需要执行make update-api来生成新的doc文件
    frameworks/base/api/system-current.txt
    frameworks/base/api/current.txt

### 3. 方法 ###

详细修改方法如下，在两个注释之间即为修改的地方：

**a.** `frameworks/base/core/res/res/values/strings.xml`

<string name="reboot_safemode_confirm">Do you want to reboot into safe mode?
             This will disable all third party applications you have installed.
             They will be restored when you reboot again.</string>
         
        
    	
    	<string name="global_action_reboot">Reboot</string>	 
    	
    	<string name="reboot_title">Reboot</string>
    	
    	
    	<string name="reboot_confirm" product="tablet">Your tablet will reboot.</string>
    	<string name="reboot_confirm" product="default">Your phone will reboot.</string>
    	
    	
        
        <string name="recent_tasks_title">Recent</string>

**b.** `frameworks/base/core/res/res/values-zh-rCN/strings.xml`

<string name="reboot_safemode_title" msgid="7054509914500140361">"重新启动并进入安全模式"</string>
        <string name="reboot_safemode_confirm" msgid="55293944502784668">"您要重新启动并进入安全模式吗？这样会停用您已安装的所有第三方应用。再次重新启动将恢复这些应用。"</string>
        
        
    	<string name="global_action_reboot">重启</string>
        <string name="reboot_title">"重启"</string>
    	<string name="reboot_confirm" product="tablet">"您的平板电脑将会重启。"</string>
    	<string name="reboot_confirm" product="default">"您的手机将会重启。"</string>
    	
    	
    	<string name="recent_tasks_title" msgid="3691764623638127888">"近期任务"</string>
        <string name="no_recent_tasks" msgid="8794906658732193473">"最近没有运行任何应用"</string>
        <string name="global_actions" product="tablet" msgid="408477140088053665">"平板电脑选项"</string>
        <string name="global_actions" product="tv" msgid="7240386462508182976">"电视选项"</string>

**c.** `frameworks/base/core/res/res/values/config.xml`

<string-array translatable="false" name="config_globalActionsList">
            <item>power</item>
            
    		<item>reboot</item>
    		
            <item>bugreport</item>
            <item>users</item>
        </string-array>

**d.** `frameworks/base/core/res/res/drawable/ic_lock_power_reboot.xml`  
此布局文件不存在，需要添加。

<?xml version="1.0" encoding="utf-8"?>
    
    
    <bitmap xmlns:android="http://schemas.android.com/apk/res/android" android:src="@drawable/ic_lock_power_reboot_alpha" android:tint="?attr/colorControlNormal" />

**e.** `frameworks/base/core/res/res/values/public.xml`

**f.** `frameworks/base/core/res/res/values/symbols.xml`

<java-symbol type="string" name="reboot_to_update_reboot" />
      <java-symbol type="string" name="reboot_to_reset_title" />
      <java-symbol type="string" name="reboot_to_reset_message" />
      
      
      <java-symbol type="string" name="reboot_confirm" />
      <java-symbol type="string" name="reboot_title" />
      
      
      <java-symbol type="string" name="reboot_safemode_confirm" />
      <java-symbol type="string" name="reboot_safemode_title" />
      <java-symbol type="string" name="relationTypeAssistant" />

**g.** `frameworks/base/services/core/java/com/android/server/policy/GlobalActions.java`

import android.database.ContentObserver;
    import android.graphics.drawable.Drawable;
    import android.media.AudioManager;
    import android.net.ConnectivityManager;
    import android.os.Build;
    import android.os.Bundle;
    import android.os.Handler;
    // 需要添加的代码
    import android.os.IPowerManager;
    // 添加结束
    import android.os.Message;
    import android.os.RemoteException;
    import android.os.ServiceManager;
    import android.os.SystemClock;
    import android.os.SystemProperties;
    import android.os.UserHandle;
    
    ................
    
    class GlobalActions implements DialogInterface.OnDismissListener, DialogInterface.OnClickListener  { 
    
    	................
    
        private static final String GLOBAL_ACTION_KEY_POWER = "power";
        
        // 需要添加的代码
    	private static final String GLOBAL_ACTION_KEY_REBOOT = "reboot";
    	// 添加结束
    	
        private static final String GLOBAL_ACTION_KEY_AIRPLANE = "airplane";
        private static final String GLOBAL_ACTION_KEY_BUGREPORT = "bugreport";
        private static final String GLOBAL_ACTION_KEY_SILENT = "silent";
        private static final String GLOBAL_ACTION_KEY_USERS = "users";
        private static final String GLOBAL_ACTION_KEY_SETTINGS = "settings";
        private static final String GLOBAL_ACTION_KEY_LOCKDOWN = "lockdown";
        private static final String GLOBAL_ACTION_KEY_VOICEASSIST = "voiceassist";
        private static final String GLOBAL_ACTION_KEY_ASSIST = "assist";
    
    	................
    
    	if (GLOBAL_ACTION_KEY_POWER.equals(actionKey)) { 
    		mItems.add(new PowerAction());
    	
    	// 需要添加的代码
    	} else if (GLOBAL_ACTION_KEY_REBOOT.equals(actionKey)) { 
    		Log.d(TAG,"add reboot actions");
    		mItems.add(new RebootAction());
    	// 添加结束
    	
    	} else if (GLOBAL_ACTION_KEY_AIRPLANE.equals(actionKey)) { 
    
    
    	................
    
    	// 需要添加的代码
    	private final class RebootAction extends SinglePressAction { 
    		private RebootAction() { 
    			super(com.android.internal.R.drawable.ic_lock_power_reboot,
    				R.string.global_action_reboot);
    		}
    		
            @Override
            public boolean showDuringKeyguard() { 
                return true;
            }
    		
            @Override
            public boolean showBeforeProvisioning() { 
                return true;
            }
    
            @Override
            public void onPress() { 
                try { 
                    IPowerManager pm = IPowerManager.Stub.asInterface(ServiceManager
                            .getService(Context.POWER_SERVICE));
                    pm.reboot(true, null, false);
                } catch (RemoteException e) { 
                    Log.e(TAG, "PowerManager service died!", e);
                    return;
                }
            }		
    	}
    	// 添加结束
    	
        private Action getBugReportAction() {

**h.** `frameworks/base/services/core/java/com/android/server/power/ShutdownThread.java`

/** * Request a clean shutdown, waiting for subsystems to clean up their * state etc. Must be called from a Looper thread in which its UI * is shown. * * @param context Context used to display the shutdown progress dialog. * @param confirm true if user confirmation is needed before shutting down. */
        public static void shutdown(final Context context, boolean confirm) { 
            mReboot = false;
            mRebootSafeMode = false;
            shutdownInner(context, confirm);
        }
    
        static void shutdownInner(final Context context, boolean confirm) { 
            // ensure that only one thread is trying to power down.
            // any additional calls are just returned
            synchronized (sIsStartedGuard) { 
                if (sIsStarted) { 
                    Log.d(TAG, "Request to shutdown already running, returning.");
                    return;
                }
            }
            
    		// 需要添加的代码
    		boolean showRebootOption = false;
    		String[] defaultActions = context.getResources().getStringArray(
    			com.android.internal.R.array.config_globalActionsList);
    		for (int i = 0; i < defaultActions.length; i++) { 
    			if (defaultActions[i].equals("reboot")) { 
    				showRebootOption = true;
    				break;
    			}
    		}
    		// 添加结束
    		
            final int longPressBehavior = context.getResources().getInteger(
                            com.android.internal.R.integer.config_longPressOnPowerBehavior);
            
            // 需要添加的代码
            //final int resourceId = mRebootSafeMode
    		int resourceId = mRebootSafeMode
    		// 添加结束
                    ? com.android.internal.R.string.reboot_safemode_confirm
                    : (longPressBehavior == 2
                            ? com.android.internal.R.string.shutdown_confirm_question
                            : com.android.internal.R.string.shutdown_confirm);
    		
    		// 需要添加的代码
    		if (showRebootOption && !mRebootSafeMode) { 
    			resourceId = com.android.internal.R.string.reboot_confirm;
    		}
    		// 添加结束
    		
            Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);
    
            if (confirm) { 
                final CloseDialogReceiver closer = new CloseDialogReceiver(context);
                if (sConfirmDialog != null) { 
                    sConfirmDialog.dismiss();
                }
                sConfirmDialog = new AlertDialog.Builder(context)
                        .setTitle(mRebootSafeMode
                                ? com.android.internal.R.string.reboot_safemode_title
                                
                                // 需要添加的代码
                                : showRebootOption
    								? com.android.internal.R.string.reboot_title
    								: com.android.internal.R.string.power_off)
    							// 添加结束
    							
                        .setMessage(resourceId)
                        .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() { 
                            public void onClick(DialogInterface dialog, int which) { 
                                beginShutdownSequence(context);
                            }
                        })
                        .setNegativeButton(com.android.internal.R.string.no, null)
                        .create();
                closer.dialog = sConfirmDialog;
                sConfirmDialog.setOnDismissListener(closer);
                sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
                sConfirmDialog.show();
            } else { 
                beginShutdownSequence(context);
            }
        }

### 4. 备注 ###

**a. 编译问题**  
更新了`framework/base/core`里面的内容后，需要执行`make update-api`来更新doc，将生成的`current.txt`和`system-current.txt`一并提交代码仓库，下次编译直接从代码仓库更新代码即可。

**b. drawable-xxx目录下图标问题**  
如果暂时找不到重启图标，可以临时使用关机图标，需要修改`ic_lock_power_reboot.xml`及`GlobalActions.java`，将其资源指向重启图标即可。