Question

我遇到的问题是，当时间更改时，应用程序运行时仅调用TIME_TICK。但即使应用正在运行或未使用广播接收器，我也希望得到它。

主要活动

public class MainActivity extends Activity {
      @Override
      public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Toast.makeText(getApplicationContext(), "Checking", Toast.LENGTH_LONG).show();
      }
    }

MyBroadastReceivers

public class MyBroadastReceiversextends BroadcastReceiver
{

    @Override
    public void onReceive(Context arg0, Intent arg1) {

        Toast.makeText(arg0, "Toast Receive", Toast.LENGTH_LONG).show();
    }
}

清单文件

    <receiver android:name="com.example.serviceschecking.MyBroadastReceivers" android:enabled="true" android:exported="true">  
       <intent-filter >
           <action android:name="android.intent.action.TIME_TICK"/>
       </intent-filter>
</receiver>

Answer 1

如API所述您必须以编程方式注册此意图：

广播行动：当前时间已经改变。每分钟发送一次。您不能通过清单中声明的组件来接收这个，只能通过使用Context.registerReceiver（）显式注册它。

你必须在你的mainActivity中注册它：

      IntentFilter mTime = new IntentFilter(Intent.ACTION_TIME_TICK);
      registerReceiver(YourReceiver, mTime);

Answer 2

根据Android documentation：

＆＃34;您无法通过清单中声明的组件接收此信息，只能通过使用Context.registerReceiver（）＆＃34;显式注册它。

查看代码，例如：

public class MainActivity extends Activity {
      @Override
      public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Toast.makeText(getApplicationContext(), "Checking", Toast.LENGTH_LONG).show();

      receiver = new MyBroadastReceivers();
      registerReceiver(receiver, new IntentFilter(Intent.ACTION_TIME_TICK));
      }

      @Override
      protected void onDestroy() {
      // Unregister MyBroadastReceivers
      unregisterReceiver(receiver);
      }
    }

另外，根据您的想法，AlarmManager可能是一个很好的选择，特别是如果您让用户配置轮询频率＆＃34;。请查看此SO thread。

Answer 3

PErfact示例我已经过测试和工作

package com.sifat.githubalarmapp;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;


public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        Toast.makeText(context, "I am running sifat", Toast.LENGTH_LONG).show();
    }
}

package com.sifat.githubalarmapp;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle; 

public class MyActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

    }



}

添加清单

  <!-- Will not be called unless the application explicitly enables it -->
        <receiver android:name=".AlarmReceiver"
            android:enabled="true">
            <intent-filter>
                <action android:name="android.intent.action.ACTION_TIME_TICK"/>
            </intent-filter>
        </receiver>

微小变化时不调用TIME_TICK

3 个答案: