意图过滤器甚至不会在编程中没有注册

Question

我想在收到SMS时敬酒。

我尝试用明确的 intect filter pustest 进行了尝试，但我部分成功了，除了我不想在杀死该应用时调用它，因此在这里的一些程序员的建议，我尝试通过将两个按钮放入我的用户界面（即register和unregister）来编程进行广播接收器，因此它们的唯一目的是注册并解开广播接收器。

我的主要目的是即使应用程序是背景，也要运行广播接收器（符合条件，用户按寄存器以及使用另一个应用程序之后）。
我一直在使用本教程：http：//www.javacodegeeks.com/2012/09/android-broadcast-receiver.html，但基本上通过SMS接收器对其进行了修改。

这是我的代码：

package gates.apps.automaticmessageresponder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
 public class MainActivity extends Activity {
SmsReceiver broadcastReceiver=new SmsReceiver();
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
public void register(View view){
    this.registerReceiver(broadcastReceiver, new IntentFilter(
             "android.provider.Telephony.SMS_RECEIVED"));
    Log.e("register","pressed");  
}
public void unRegister(View view){
     this.unregisterReceiver(broadcastReceiver);
     Log.e("unregister","pressed");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
}

和其他类

package gates.apps.automaticmessageresponder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;
public class SmsReceiver extends BroadcastReceiver {
// Get the object of SmsManager
final SmsManager sms = SmsManager.getDefault();
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    // Retrieves a map of extended data from the intent.
    final Bundle bundle = intent.getExtras();
    try {
        if (bundle != null) {
            final Object[] pdusObj = (Object[]) bundle.get("pdus");
            for (int i = 0; i < pdusObj.length; i++) {
                SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                String phoneNumber = currentMessage.getDisplayOriginatingAddress();
                String senderNum = phoneNumber;
                String message = currentMessage.getDisplayMessageBody();
                Log.i("SmsReceiver", "senderNum: "+ senderNum + "; message: " + message);

               // Show alert
                int duration = Toast.LENGTH_LONG;
                Toast toast = Toast.makeText(context, "senderNum: "+ senderNum + ", message: " + message, duration);
                toast.show();
            } // end for loop
          } // bundle is null
    } catch (Exception e) {
        Log.e("SmsReceiver", "Exception smsReceiver" +e);
    }
}
}

我没有修改清单文件，除了我将权限添加到接收SMS 中。即使我正在记录日志，寄存器也被按下和未经压力。我认为问题在于注册接收器按钮即使没有单击即使是异常的行为？还是我的看法是错误的？

Answer 1

，而不是在清单中声明BroadcastReceiver尝试如下所示，这会将其与Activity生命周期（不要忘记在清单文件中添加权限添加权限）：

public class ExampleMainActivity extends Activity {
   //Activity Stuff
   private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, final Intent intent) {
            //Do things you want with message.
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("Title");
            builder.setMessage("You may add your things here");
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            });
            builder.show();
        }
    };
    protected void onResume() {
        super.onResume();
        // OR YOU CAN REGISTER UNREGISTER AS YOU WANT
        this.registerReceiver(broadcastReceiver, new IntentFilter(
                 "android.provider.Telephony.SMS_RECEIVED"));
    };
    @Override
    protected void onPause() {
        super.onPause();
         // OR YOU CAN REGISTER UNREGISTER AS YOU WANT
         this.unregisterReceiver(broadcastReceiver);
    }
}

---

编辑：

您可以使用应用程序首选项检查此交替解决方案：

package gates.apps.automaticmessageresponder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
 public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}
public void register(View view){
    SharedPreferences preferences = context.getSharedPreferences("FILE_NAME", Context.MODE_PRIVATE);
    Editor edit = preferences.edit();
    edit.putBoolean("isRegistered", true);
    edit.commit();
    Log.e("register","pressed");  
}
public void unRegister(View view){
    SharedPreferences preferences = context.getSharedPreferences("FILE_NAME", Context.MODE_PRIVATE);
    Editor edit = preferences.edit();
    edit.putBoolean("isRegistered", false);
    edit.commit();
     Log.e("unregister","pressed");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
}

和

package gates.apps.automaticmessageresponder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.Toast;
public class SmsReceiver extends BroadcastReceiver {
// Get the object of SmsManager
final SmsManager sms = SmsManager.getDefault();
@Override
public void onReceive(Context context, Intent intent) {
    // TODO Auto-generated method stub
    // Retrieves a map of extended data from the intent.
    final Bundle bundle = intent.getExtras();
    try {
        if (bundle != null) {
            final Object[] pdusObj = (Object[]) bundle.get("pdus");
            for (int i = 0; i < pdusObj.length; i++) {
                SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                String phoneNumber = currentMessage.getDisplayOriginatingAddress();
                String senderNum = phoneNumber;
                String message = currentMessage.getDisplayMessageBody();
                Log.i("SmsReceiver", "senderNum: "+ senderNum + "; message: " + message);
        SharedPreferences preferences = context.getSharedPreferences("FILE_NAME", Context.MODE_PRIVATE);
        boolean isRegistered = preferences.getBoolean("isRegistered", false);
                if(isRegistered ) {
                    // Show alert
                    int duration = Toast.LENGTH_LONG;
                    Toast toast = Toast.makeText(context, "senderNum: "+ senderNum + ", 
                                        message: " + message, duration);
                    toast.show();
        }
            } // end for loop
          } // bundle is null
    } catch (Exception e) {
        Log.e("SmsReceiver", "Exception smsReceiver" +e);
    }
}
}

Answer 2

造成此不起作用的原因是因为寄存器/未注册没有与活动生命周期绑定，可能会留下多个广播接收器被注册。考虑这种情况：

用户导航到主动脉，然后在寄存器按钮上敲击。然后，用户离开活动（没有未注册），并且该应用程序可能没有被杀死。请注意，您的广播回接收器仍在注册中。

然后，某个时候，用户将导航回活动，然后再次注册。现在，您有两个关于动作的广播接收器。您几乎泄漏了一个接收器。

开始解决方案：在清单中注册您的接收器。使用共享的偏好键/值对保存"寄存器"按钮单击。然后，当您被调用时，请使用键/值对状态来确定您是否要吐司。