Android Accessibility(辅助功能)

对于那些由于视力、听力或其它身体原因导致不能方便使用Android智能手机的用户，Android提供了Accessibility 功能 和服务帮助这些用户更加简单地操作设备，包括文字转语音、触觉反

     对于那些由于视力、听力或其它身体原因导致不能方便使用Android智能手机的用户，Android提供了Accessibility功能和服务帮助这些用户更加简单地操作设备，包括文字转语音、触觉反馈、手势操作、轨迹球和手柄操作。开发者可以搭建自己的Accessibility服务，这可以加强可用性，例如声音提示，物理反馈，和其他可选的操作模式。

     随着Android版本的不断升级，Android Accessibility功能也越来越强大，Android 4.0版本以前，系统辅助服务功能比较单一，仅仅能过单向获取窗口元素信息，比如获取输入框用户输入内容。到Android 4.1版本以后，系统辅助服务增加了与窗口元素的双向交互，此时可以通过辅助功能服务操作窗口元素，比如点击按钮等。

    由于系统辅助服务能够实时获取您当前操作应用的窗口元素信息，这有可能给你带来隐私信息的泄露风险，比如获取非密码输入框的输入内容等。同时通过辅助功能也可以模拟用户自动化点击应用内元素，也会带来一定的安全风险。

    本文实现了一种通过系统辅助服务完成应用的自动安装、卸载、强行停止的功能。

1、AndroidManifest.xml文件配置自己实现的MyAccessibilityService服务。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.jack.accessibility" android:versioncode="1" android:versionname="1.0">

    <uses-sdk android:minsdkversion="8" android:targetsdkversion="18"></uses-sdk>

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"></uses-permission>
    <uses-permission android:name="android.permission.BIND_ACCESSIBILITY_SERVICE"></uses-permission>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>
    
    <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme">
        <activity android:name="com.jack.accessibility.MainActivity" android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"></action>
                <category android:name="android.intent.category.LAUNCHER"></category>
            </intent-filter>
        </activity>
        <service android:label="@string/acc_service_name" android:name=".MyAccessibilityService" android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
            <intent-filter>
                <action android:name="android.accessibilityservice.AccessibilityService"></action>
            </intent-filter>
            <meta-data android:name="android.accessibilityservice" android:resource="@xml/phone_accessibility"></meta-data>
        </service>

    </application>

</manifest>

2、在res/xml/phone_accessibility.xml配置相应的参数信息。

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service android:description="@string/accessibility_service_description" android:accessibilityeventtypes="typeAllMask" android:accessibilityfeedbacktype="feedbackGeneric" android:notificationtimeout="100" android:accessibilityflags="" android:canretrievewindowcontent="true" xmlns:android="http://schemas.android.com/apk/res/android"></accessibility-service>

3、MainActivity实现安装、卸载、强行停止动作的发起。

package com.jack.accessibility;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.Settings;
import android.view.View;
import android.app.Activity;
import android.content.Intent;

public class MainActivity extends Activity {
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		this.findViewById(R.id.activeButton).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent killIntent = new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS);
				startActivity(killIntent);
			}
		});
		
		this.findViewById(R.id.installButton).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				MyAccessibilityService.INVOKE_TYPE = MyAccessibilityService.TYPE_INSTALL_APP;
				String fileName = Environment.getExternalStorageDirectory() + "/test.apk"; 
				File installFile = new File(fileName);
				if(installFile.exists()){
					installFile.delete();
				}
				try {
					installFile.createNewFile();
					FileOutputStream out = new FileOutputStream(installFile);
					byte[] buffer = new byte[512];
					InputStream in = MainActivity.this.getAssets().open("test.apk");
					int count;
					while((count= in.read(buffer))!=-1){
						out.write(buffer, 0, count);
					}
					in.close();
					out.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				Intent intent = new Intent(Intent.ACTION_VIEW); 
				intent.setDataAndType(Uri.fromFile(new File(fileName)), "application/vnd.android.package-archive"); 
				startActivity(intent);
				
			}
		});
		this.findViewById(R.id.uninstallButton).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				MyAccessibilityService.INVOKE_TYPE = MyAccessibilityService.TYPE_UNINSTALL_APP;
				Uri packageURI = Uri.parse("package:com.example.test"); 
				Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI); 
				startActivity(uninstallIntent); 
			}
		});
		this.findViewById(R.id.killAppButton).setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				MyAccessibilityService.INVOKE_TYPE = MyAccessibilityService.TYPE_KILL_APP;
				Intent killIntent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
				Uri packageURI = Uri.parse("package:com.example.test"); 
				killIntent.setData(packageURI);
				startActivity(killIntent);
			}
		});
	}
}

4、MyAccessibilityService中通过自动化点击实现应用安装、卸载、强行停止功能。

package com.jack.accessibility;

import java.util.List;

import android.accessibilityservice.AccessibilityService;
import android.annotation.SuppressLint;
import android.util.Log;
import android.view.KeyEvent;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;

@SuppressLint("NewApi")
public class MyAccessibilityService extends AccessibilityService {

	public static int INVOKE_TYPE = 0;
	public static final int TYPE_KILL_APP = 1;
	public static final int TYPE_INSTALL_APP = 2;
	public static final int TYPE_UNINSTALL_APP = 3;
	
	public static void reset(){
		INVOKE_TYPE = 0;
	}

	@Override
	public void onAccessibilityEvent(AccessibilityEvent event) {
		// TODO Auto-generated method stub
		this.processAccessibilityEnvent(event);
	}

	private void processAccessibilityEnvent(AccessibilityEvent event) {

		Log.d("test", event.eventTypeToString(event.getEventType()));
		if (event.getSource() == null) {
			Log.d("test", "the source = null");
		} else {
			Log.d("test", "event = " + event.toString());
			switch (INVOKE_TYPE) {
			case TYPE_KILL_APP:
				processKillApplication(event);
				break;
			case TYPE_INSTALL_APP:
				processinstallApplication(event);
				break;
			case TYPE_UNINSTALL_APP:
				processUninstallApplication(event);
				break;				
			default:
				break;
			}						
		}
	}

	@Override
	protected boolean onKeyEvent(KeyEvent event) {
		// TODO Auto-generated method stub
		return true;

	}

	@Override
	public void onInterrupt() {
		// TODO Auto-generated method stub

	}

	private void processUninstallApplication(AccessibilityEvent event) {
		
		if (event.getSource() != null) {
			if (event.getPackageName().equals("com.android.packageinstaller")) {
				List<accessibilitynodeinfo> ok_nodes = event.getSource().findAccessibilityNodeInfosByText("确定");
				if (ok_nodes!=null && !ok_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<ok_nodes.size i node="ok_nodes.get(i);" if node.isenabled node.performaction private void processinstallapplication event null list> unintall_nodes = event.getSource().findAccessibilityNodeInfosByText("安装");
				if (unintall_nodes!=null && !unintall_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<unintall_nodes.size i node="unintall_nodes.get(i);" if node.isenabled node.performaction list> next_nodes = event.getSource().findAccessibilityNodeInfosByText("下一步");
				if (next_nodes!=null && !next_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<next_nodes.size i node="next_nodes.get(i);" if node.isenabled node.performaction list> ok_nodes = event.getSource().findAccessibilityNodeInfosByText("打开");
				if (ok_nodes!=null && !ok_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<ok_nodes.size i node="ok_nodes.get(i);" if node.isenabled node.performaction private void processkillapplication event null list> stop_nodes = event.getSource().findAccessibilityNodeInfosByText("强行停止");
				if (stop_nodes!=null && !stop_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<stop_nodes.size i node="stop_nodes.get(i);" if node.performaction list> ok_nodes = event.getSource().findAccessibilityNodeInfosByText("确定");
				if (ok_nodes!=null && !ok_nodes.isEmpty()) {
					AccessibilityNodeInfo node;
					for(int i=0; i<ok_nodes.size i node="ok_nodes.get(i);" if node.performaction log.d ok><p><br></p>完整DEMO下载地址：http://download.csdn.net/detail/jiazhijun/8251277<br>


</ok_nodes.size></stop_nodes.size></ok_nodes.size></next_nodes.size></unintall_nodes.size></ok_nodes.size></accessibilitynodeinfo>