我是android开发的初学者。下面我给出我的主要activity.java代码。我的要求,如果互联网连接或 wifi 不能在移动设备上工作,然后执行以下操作
- 如果互联网连接不起作用,则在应用程序启动时显示我的初始屏幕背景,并提供对话框或警报,如旅行顾问的此屏幕截图检查此图像和屏幕截图。如果取消按钮按下然后对话框消失,只显示启动画面,如果按下再试一次,然后尝试执行连接到互联网。
在我的代码中,我使用代码购买对话框,我不想要购买功能,这不是我的要求。我想要和旅行顾问一模一样。对我来说很容易,如果有人编辑我的代码并显示在哪里进行更改,非常感谢提前
package com.example.edarabia;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;
@SuppressLint("SetJavaScriptEnabled")
public class MainActivity extends Activity{
WebView mywebview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebview = (WebView) findViewById(R.id.webview);
if(isNetworkConnected() == true){
mywebview.getSettings().setJavaScriptEnabled(true);
mywebview.setWebViewClient(new myWebClient());
mywebview.loadUrl("http://www.grafdom.com/operations/projects/ma/edarabiaapp/");
mywebview.getSettings().setBuiltInZoomControls(true);
mywebview.getSettings().setLoadWithOverviewMode(false);
mywebview.getSettings().setUseWideViewPort(false);
}else{
showBuyDialog();
}
}
// @Override
// public boolean onKeyDown(int keyCode, KeyEvent event) {
// Check if the key event was the Back button and if there's history
// if ((keyCode == KeyEvent.KEYCODE_BACK) && mywebview.canGoBack()) {
// mywebview.goBack();
// return true;
// }
// return super.onKeyDown(keyCode, event);
// }
// To handle "Back" key press event for WebView to go back to previous screen.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK) && mywebview.canGoBack()) {
mywebview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onBackPressed() {
finish();
}
public class myWebClient extends WebViewClient
{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
//// This method will retun boolean value if net conect then value will be true otherwise false
private boolean isNetworkConnected() {
ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null) {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
return false;
}
public void showBuyDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("just for testing");
builder.setMessage("Check you net conectivity....");
builder.setCancelable(false);
builder.setPositiveButton("Buy", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent browserIntent = new Intent(
Intent.ACTION_VIEW,
Uri.parse("https://www.google.com"));
startActivity(browserIntent);
}
});
builder.show();
}
}