好的,这是我的问题:
当没有互联网连接时,我将开始新的活动,但新的活动屏幕是黑色的。新活动应显示ImageView ...
检查连通性并开始新的活动:
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
if (!info.isConnected()) {
}
}
else {
startActivity(new Intent(main.this, no_connection.class));
}
NO_CONNECTION ACTIVITY:
package com.hello.hello;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
public class no_connection extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.connection_error);
ImageView image = (ImageView) findViewById(R.id.image_verkkovirhe);
}
}
此处是CONNECTION_ERROR布局:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/connection_error"
android:fitsSystemWindows="true" android:orientation="vertical">
<ImageView
android:src="@drawable/verkkovirhe"
android:layout_width="fill_parent"
android:id="@+id/image_verkkovirhe"
android:layout_height="fill_parent"
android:clickable="false"
android:fitsSystemWindows="true"
android:visibility="visible"></ImageView>
</RelativeLayout>
OR
也许我只能在没有网络连接的情况下更改布局?当我尝试这个时,我会强行关闭?
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null) {
if (!info.isConnected()) {
}
}
else {
setContentView(R.layout.connection_error );
}
答案 0 :(得分:1)
如果要从服务启动新活动,则应使用FLAG_ACTIVITY_NEW_TASK
标志。它应该是这样的:
Intent intent = new Intent(main.this, no_connection.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);