Android 实现Activity后台运行

 @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
    PackageManager pm = getPackageManager();
    ResolveInfo homeInfo = pm.resolveActivity(new Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_HOME), 0);
    ActivityInfo ai = homeInfo.activityInfo;
Intent startIntent = new Intent(Intent.ACTION_MAIN);
startIntent.addCategory(Intent.CATEGORY_LAUNCHER);
startIntent.setComponent(new ComponentName(ai.packageName, ai.name));
startActivitySafely(startIntent);
    return true;
    }
    return super.onKeyDown(keyCode, event);
    }


 private void startActivitySafely(Intent intent) {  
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
    try {  
    startActivity(intent);  
    } catch (ActivityNotFoundException e) {  
    Toast.makeText(this, "没正常启动", Toast.LENGTH_SHORT).show();  
    } catch (SecurityException e) {  
    Toast.makeText(this, "存在安全隐患",  
    Toast.LENGTH_SHORT).show();  
    Log.e(MYLOG,"Launcher does not have the permission to launch "  
    + intent  
    + ". Make sure to create a MAIN intent-filter for the corresponding activity "  
    + "or use the exported attribute for this activity.",  
    e);  
    }  
    }

下面是在通知栏开启一个已经启动的Activity

public void createNotification() {
//int icon = android.R.drawable.ic_menu_revert;
int icon = R.drawable.icon;
Notification notification = new Notification(icon, "", notificationId);
notification.flags = Notification.FLAG_ONLY_ALERT_ONCE;
notification.setLatestEventInfo(context, "", "", receiveIntent());
RemoteViews contentView = new RemoteViews(context.getPackageName(), R.layout.app_notification_layout);
notification.contentView = contentView;
notfionMgr.notify(notificationId, notification);
}

private PendingIntent receiveIntent() {
Intent appIntent = new Intent(Intent.ACTION_MAIN);
appIntent.addCategory(Intent.CATEGORY_LAUNCHER);
appIntent.setComponent(new ComponentName(context.getPackageName(),
context.getPackageName() + "." + localClassName));
appIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
appIntent.setFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
appIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent contentIntent = PendingIntent.getActivity(context, notificationId, appIntent, PendingIntent.FLAG_UPDATE_CURRENT);

//Intent intent = new Intent(context, HomeActivity.class);
////intent.putExtra(NONE_START_APP, NONE);
//intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
//PendingIntent contentIntent = PendingIntent.getActivity(context, notificationId, intent, PendingIntent.FLAG_UPDATE_CURRENT);
return contentIntent;
}

更多相关文章

随机推荐