在我的应用程序中,有两个类是InternetActivity,它只扩展Activity并将contentview设置为main.和扩展广播接收器的MyClass.
我在main.xml文件中有2个TextView和2个WIFI和GPRS ImageView.
当连接性发生变化时,brodcast接收器将被调用,并根据启用的内容和不想要设置TextView和ImageView的可见性.但它只显示图像而不是变化.
这是MyClass.java文件.我该怎么做??
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();
}
}
}
P.S:它正确地进入Mobile.isConnected()和!Mobile.isConnected()并在日志文件中显示它但其可见性没有改变.我没有正确设置视图?是否可以从这个广播接收器调用setContentView(view)?
解决方法:
您需要将接收器放入InternetActivity类,在那里注册并使用已定义的局部变量.您无需创建单独的公共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);
}
}
原文地址:https://www.jb51.cc/android/1071450.html
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