Question

我刚刚开始开发一个Android应用程序，它上面有一个webview。我希望从特定时间开始每15分钟重新加载一次webview，如果我理解正确，我需要使用AlarmManager才能完成此任务。但我真的没有得到如何使用AlarmManager所以有人可以帮我这个吗？也许很少的例子或什么？

谢谢！

另外，仅供参考我查看了文件。

更新所以我试图在这里实现AlarmManager ..并且不认为它正在工作...... 这是我的活动文件......

public class MainActivity extends Activity {

// to make our alarm manager
AlarmManager alarmManager;
WebView myWebView;
private PendingIntent pendingIntent;

Context context;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);

    this.context = this;

    //initialize alarm manager
    //alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

    // create instance of a calendar
    //Calendar calendar = Calendar.getInstance();

    // create an intent to Alarm Receiver class
    Intent alarmIntent = new Intent(this.context, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, alarmIntent, 0);

    myWebView = (WebView) findViewById(R.id.webview);
    myWebView.setWebViewClient(new WebViewClient());
    myWebView.loadUrl("<some url goes in here>");
    WebSettings webSettings = myWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);

    reloadWebView();
}
private void reloadWebView(){
    AlarmManager alarmManger = (AlarmManager)getSystemService(ALARM_SERVICE);
    int interval = 1000*60*15;

    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.set(Calendar.HOUR_OF_DAY, 4);
    calendar.set(Calendar.MINUTE,0);

    alarmManger.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), interval, pendingIntent);

    }
}

这是AlarmReceiver类公共类AlarmReceiver扩展了BroadcastReceiver {

    WebView myWebView;

    @Override
    public void onReceive(Context context, Intent intent) {
        myWebView.reload();
        Toast.makeText(context, "I'm running", Toast.LENGTH_SHORT).show();
    }
}

谁能告诉我我做错了什么？谢谢！

Answer 1

您安排闹钟管理员在凌晨4点解雇您的意图。使用RTC_WAKEUP使用当前系统时间+第一次火灾的间隔：

alarmManger.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + interval, interval, pendingIntent);

同时检查您的警报接收器是否在Manifest中注册

在特定时间重新加载webview

1 个答案: