Accessibility服務(wù)可以為所有的應(yīng)用程谦趣，一組應(yīng)用程序或單個應(yīng)用程序提供這些增強(qiáng)功能。

1. 新建一個類繼承 AccessibilityService

   public class InstallAccessibilityService extends AccessibilityService
   

2. AndroidManifest文件里注冊

   <service    
   android:name=".InstallAccessibilityService"    
   android:label="智能安裝"    
   android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">    
   <intent-filter>        
   <action android:name="android.accessibilityservice.AccessibilityService" />    
   </intent-filter>    
   <meta-data               
   android:name="android.accessibilityservice"               
   android:resource="@xml/accessibility_service_config" />
   </service>
   

3. accessibility_service_config.xml
   AndroidManifest里添加<meta-data>標(biāo)簽一罩，在標(biāo)簽里指出配置文件的位置

   <accessibility-service 
    xmlns:android="http://schemas.android.com/apk/res/android"    
    android:packageNames="com.android.packageinstaller"    
    android:description="@string/accessibility_service_description"    
    android:accessibilityEventTypes="typeAllMask"    
    android:accessibilityFlags="flagDefault"    
    android:accessibilityFeedbackType="feedbackGeneric"    
    android:canRetrieveWindowContent="true"    />
   

4. AccessibilityService 方法重載

onServiceConnected() - 可選廊驼。系統(tǒng)會在成功連接上你的服務(wù)的時候調(diào)用這個方法扰付，在這個方法里你可以做一下初始化工作此叠，例如設(shè)備的聲音震動管理纯续，也可以調(diào)用setServiceInfo()進(jìn)行配置工作。

onAccessibilityEvent() - 必須灭袁。通過這個函數(shù)可以接收系統(tǒng)發(fā)送來的AccessibilityEvent猬错，接收來的AccessibilityEvent是經(jīng)過過濾的，過濾是在配置工作時設(shè)置的茸歧。

onInterrupt() - 必須倦炒。這個在系統(tǒng)想要中斷AccessibilityService返給的響應(yīng)時會調(diào)用。在整個生命周期里會被調(diào)用多次软瞎。

onUnbind() - 可選逢唤。在系統(tǒng)將要關(guān)閉這個AccessibilityService會被調(diào)用。在這個方法中進(jìn)行一些釋放資源的工作

5. 一般在onServiceConnected()方法里進(jìn)行

   private void setServiceInfo(int feedbackType) {  
   AccessibilityServiceInfo info = new AccessibilityServiceInfo();      
   info.eventTypes = AccessibilityEvent.TYPES_ALL_MASK; 
    info.feedbackType = feedbackType;  
    info.notificationTimeout = EVENT_NOTIFICATION_TIMEOUT_MILLIS;  
    info.packageNames = PACKAGE_NAMES;  
    setServiceInfo(info);  
    }
   

6. 智能安裝apk

   private void installApk(String path) {    
   if (!path.endsWith(".apk")) {        
   Toast.makeText(this, "文件不可安裝", Toast.LENGTH_SHORT).show();   
   } else {        
   if (!isRoot()) {            
   Toast.makeText(this, "沒有ROOT權(quán)限涤浇，將進(jìn)行智能安裝", Toast.LENGTH_SHORT).show();                     
   smartInstall(path);        
   } else {            
   silentInstall(path);        }    }}
   private void silentInstall(final String path) {    
   new Thread(new Runnable() {        
   @Override        
   public void run() {            
   SilentInstall installHelper = new SilentInstall();            
   final boolean result = installHelper.install(path);            
    runOnUiThread(new Runnable() {                
   @Override                
   public void run() {                    
   if (result) {                        
   installBtn.setText("安裝成功");                    
   } else {                        
   installBtn.setText("安裝失敗");                    
   }                    
    installBtn.setText("秒裝");                
   }            
   });        
   }    
   }).start();
    }
   private void smartInstall(String path) {    
   Uri uri = Uri.fromFile(new File(path));    
   Intent localIntent = new Intent(Intent.ACTION_VIEW);    
   localIntent.setDataAndType(uri, "application/vnd.android.package-archive");   
   try {        startActivity(localIntent);    } catch (Exception e) {        e.printStackTrace();    }}
   
   
   public class SilentInstall {    
   public boolean install(String path) {        
   boolean result = false;        
   DataOutputStream dataOutputStream = null;        
   BufferedReader bufferedReader = null;       
   try {            
   Process process = Runtime.getRuntime().exec("su");            
   dataOutputStream = new DataOutputStream(process.getOutputStream());            
   String commmad = "pm instll -r " + path + "\n";            
   dataOutputStream.write(commmad.getBytes(Charset.forName("utf-8")));            
   dataOutputStream.flush();            
   dataOutputStream.writeBytes("exit\n");            
   dataOutputStream.flush();            
   process.waitFor();            
   bufferedReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));            
   String msg = ""; 
       String line = "";
        while ((line = bufferedReader.readLine()) != null) {
            msg += line;
        }
        if (!msg.contains("Failure")) {
            result = true;
        }
     } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (dataOutputStream != null) {
                dataOutputStream.close();
            } 
           if (bufferedReader != null) { 
               bufferedReader.close();
            } 
       } catch (IOException e) { 
          e.printStackTrace(); 
       } 
   } 
   return result;
   

   }}
   7 開啟輔助功能

   Intent intent = new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS);
   startActivity(intent);