Android 从广播接收器调用SetContentView()
在我的应用程序中有两个类,第一类是InternetActivity,它只扩展活动并将contentview设置为main。以及扩展广播接收器的MyClass 我在main.xml文件中有2个WIFI和GPRS的文本视图和2个图像视图。 当连接发生变化时,会调用brodcast接收器,并根据启用的内容和未启用的内容设置TextView和ImageView的可见性。但它只是显示图像,而不是变化。 这是MyClass.java文件。我该怎么做Android 从广播接收器调用SetContentView(),android,broadcastreceiver,Android,Broadcastreceiver,在我的应用程序中有两个类,第一类是InternetActivity,它只扩展活动并将contentview设置为main。以及扩展广播接收器的MyClass 我在main.xml文件中有2个WIFI和GPRS的文本视图和2个图像视图。 当连接发生变化时,会调用brodcast接收器,并根据启用的内容和未启用的内容设置TextView和ImageView的可见性。但它只是显示图像,而不是变化。 这是MyClass.java文件。我该怎么做 public class MyClass extends
public class MyClass extends BroadcastReceiver {
private static ImageView wifi_image, gprs_image;
private static TextView wifi_text, gprs_text;
@Override
public void onReceive(Context context, Intent intent) {
Log.i("IntrntActivity", "Broadcast message receivved");
LinearLayout layout = new LinearLayout(context);
LinearLayout.LayoutParams params = new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
View view = View.inflate(context, R.layout.main, layout);
wifi_image = (ImageView) view.findViewById(R.id.wifi_image);
gprs_image = (ImageView) view.findViewById(R.id.gprs_image);
wifi_text = (TextView) view.findViewById(R.id.wifi_text);
gprs_text = (TextView) view.findViewById(R.id.gprs_text);
wifi_image.setVisibility(View.GONE);
wifi_text.setVisibility(View.GONE);
gprs_image.setVisibility(View.GONE);
gprs_text.setVisibility(View.GONE);
ConnectivityManager cm = (ConnectivityManager) context
.getSystemService(context.CONNECTIVITY_SERVICE);
NetworkInfo WIFI = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
NetworkInfo Mobile = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (!WIFI.isConnected() && WIFI.isAvailable()) {
Toast.makeText(context, "WIFI is available but not connected",
Toast.LENGTH_LONG).show();
}
if (cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isAvailable()) {
wifi_image.setVisibility(View.VISIBLE);
wifi_text.setVisibility(View.VISIBLE);
}
if (Mobile.isConnected()) {
gprs_image.setVisibility(View.VISIBLE);
gprs_text.setVisibility(View.VISIBLE);
Log.i("IntrntActivity", "Mobile isConnected");
// Toast.makeText(context,"GPRS is available",
// Toast.LENGTH_LONG).show();
}
if (!Mobile.isConnected()) {
gprs_image.setVisibility(View.GONE);
gprs_text.setVisibility(View.GONE);
Log.i("IntrntActivity", "Mobile is Not Connected");
// Toast.makeText(context,"GPRS is available",
// Toast.LENGTH_LONG).show();
}
}
}
附言:它正确地进入了
Mobile.isConnected()
和!Mobile.isConnected()
并将其显示在日志文件中,但其可见性没有更改。我是否未正确设置视图?是否可以从此广播接收器调用setContentView(view)?您还没有将膨胀视图添加到活动内容视图中
您应该在onCreate方法中将所有内容都膨胀并设置为内容视图。然后,广播接收器应仅设置选定视图的可见性
class MyActivity extends Activity {
private ImageView wifiIcon;
public void onCreate() {
setContentView(...);
wifiIcon = (ImageView) findViewById(...);
}
private BroadcastReceiver myBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// ...
wifiIcon.setVisibility( isWifiEnabled ? View.VISIBLE : View.GONE);
}
};
}
您需要将接收器放入InternetActivity类中,在那个里注册它并使用已经定义的局部变量。您不需要创建单独的公共BroadcastReceiver实现,只需执行本地实现 像这样:
import android.content.BroadcastReceiver;
import android.content.Context;
public class InternetActivity extends Activity {
private ImageView image;
private TextView text;
private BroadcastReceiver reciever = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
// do all the checking
// interact with image and text
}
};
@Override
public void onCreate(Bundle state) {
setContentView(R.layout.....);
// fill in image and text variables
}
@Override
public void onStart() {
registerReceiver(receiver, /* your intent filter here */);
}
@Override
public void onStop() {
unregisterReceiver(receiver);
}
}
我该怎么做?如何从正在扩展的
BroadcastReceiver()
的MyClass
调用setContentView?我费了好大劲才最终完成。还有其他方法吗。。因此,接收时的广播接收器不需要在活动中定义///意味着如何更改整个应用程序的顶栏图像