Question

我有这个AccessibilityService类：

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正如您在public class USSDService extends AccessibilityService { public static String TAG = "USSDService"; public String responsee=""; @Override public void onAccessibilityEvent(AccessibilityEvent event) { Log.d(TAG, "onAccessibilityEvent"); String text = event.getText().toString(); if (event.getClassName().equals("android.app.AlertDialog")) { performGlobalAction(GLOBAL_ACTION_BACK); Log.d(TAG, text); Intent intent = new Intent("message"); intent.putExtra("value", text); Toast.makeText (this,text,Toast.LENGTH_LONG).show(); this.sendBroadcast(intent);// write a broad cast receiver and call sendbroadcast() from here, if you want to parse the message for balance, date } } @Override public void onInterrupt() { } @Override protected void onServiceConnected() { super.onServiceConnected(); Log.d(TAG, "onServiceConnected"); AccessibilityServiceInfo info = new AccessibilityServiceInfo(); info.flags = AccessibilityServiceInfo.DEFAULT; info.packageNames = new String[]{"com.android.phone"}; info.eventTypes = AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED; info.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC; setServiceInfo(info); }}方法中所看到的，我使用方法onAccessibilityEvent发送意图。

在MainActivity中，我使用BroadcastReceiver接收如下值：

sendBroadcast

当我调用ussd时，我的应用程序运行正常public class MainActivity extends AppCompatActivity { private BroadcastReceiver bReceiver = new BroadcastReceiver(){ @Override public void onReceive(Context context, Intent intent) { //put here whaterver you want your activity to do with the intent received Log.i("onReceive",intent.getStringExtra("value") ); } }; protected void onResume(){ super.onResume(); Log.i("onResume", "22222"); LocalBroadcastManager.getInstance(this).registerReceiver(bReceiver, new IntentFilter("message")); } protected void onPause (){ super.onPause(); Log.i("onPause", "11111"); LocalBroadcastManager.getInstance(this).unregisterReceiver(bReceiver); } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);}}方法正常工作且值显示在Toast中，但方法onAccessibilityEvent不起作用，我不知道问题出在哪里。请帮帮我。

Answer 1

Intent intent = new Intent();
intent.setAction("com.example.broadcast.MY_NOTIFICATION");
intent.putExtra("message");
LocalBroadcastManager.getInstance(this).sendBroadcast(intent‌);

来自Android： “intent的操作字符串必须提供应用程序的Java包名称语法，并唯一标识广播事件。”

Answer 2

已正确启动的AccessibilityService，您的Activity将在不同的进程中存在。这是定义。假设您已正确启动AccessibilityService，以下是您想要的。

public class USSDService extends AccessibilityService {

    public void onAccessibilityEvent(AccessibilityEvent event) {

        Intent intent = new Intent(getPackageName() + "ACTION_ID");
        intent.putExtra("extra_id", "value");

        sendBroadcast(intent);
    }
}

然后您将在您的活动中注册此广播，如下所示：

public class MainActivity extends AppCompatActivity {

    protected void onResume(){
        super.onResume();

        registerReceiver(new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                Log.d("Broadcast", intent.getExtras().getString("extra_id"));
            }
        }, new IntentFilter(getPackageName() + "ACTION_ID"));
    }
}

这里重要的部分是A：您的意图过滤器与您的包名称相关联，并且＆＃34; ACTION_ID＆＃34;总是相同的字符串。最终，这可能最好是通过Activity类或服务类中的公共静态最终字符串...或者在其他类中抽象出这层通信。

Android使用Broadcast Receivers发送值

2 个答案: