添加权限
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
主程序
package com.test.mynetwork;
import android.support.v7.app.ActionBarActivity;
import java.lang.reflect.Field;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Message;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ZoomButtonsController;
public class MainActivity extends Activity implements OnClickListener {
private TextView mTextView;
private TextView mTextViewError;
private ProgressBar mProgressBar;
private Button mButton;
private ConnectivityManager mConnectivityManager;
private WebView mWebView;
/**
* 不要忘记权限的添加
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
mTextView = (TextView) findViewById(R.id.textview);
mTextViewError = (TextView) findViewById(R.id.text_error);
mButton = (Button) findViewById(R.id.button1);
mWebView = (WebView) findViewById(R.id.webView);
// 允许加载JavaScript脚本语言。
mWebView.getSettings().setJavaScriptEnabled(true);
// 设置是否支持手势缩放
mWebView.getSettings().setBuiltInZoomControls(true);
// 因为其中有网页加载时的页面控制信息,主要是进度条控制
mWebView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
// 设置进度条的进度值
mProgressBar.setProgress(newProgress);
}
});
// 注意这条的添加
mWebView.setWebViewClient(new WebViewClient() {
// 当网页加载失败时执行此方法,6.0中做了改进,所以一般用时,用这个废弃的方法。
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
// TODO Auto-generated method stub
super.onReceivedError(view, errorCode, description, failingUrl);
mWebView.setVisibility(View.GONE);
mTextViewError.setVisibility(View.VISIBLE);
}
// 网页开始加载时的控制方法
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
mProgressBar.setVisibility(View.VISIBLE);
}
// 网页加载完成时的控制方法
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
mProgressBar.setVisibility(View.INVISIBLE);
}
});
// 填写要加载的网页
mWebView.loadUrl("http://www.oneplusbbs.com/");
mButton.setOnClickListener(this);
// 得到网络连接的服务
mConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// 因为网页加载在堆栈中,所以能一级一级的返回,通过对返回键的监听来返回上一堆栈
if (keyCode == KeyEvent.KEYCODE_BACK) {
// 判断是否可以返回
if (mWebView.canGoBack()) {
// 可以返回时,就返回
mWebView.goBack();
return true;
} else {
// 当不能返回时,关闭程序。
MainActivity.this.finish();
return true;
}
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
NetworkInfo info = mConnectivityManager.getActiveNetworkInfo();
// 可查看api
if (info != null && info.isConnected()) {
Toast.makeText(getApplicationContext(), "有网络连接", Toast.LENGTH_SHORT).show();
mTextView.setText("" + info.getTypeName());
} else {
Toast.makeText(getApplicationContext(), "无网路连接", Toast.LENGTH_SHORT).show();
mTextView.setText("无网络连接");
}
break;
default:
break;
}
}
}
布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="网路连接"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<WebView
android:id="@+id/webView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="invisible"
style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"/>
<TextView
android:id="@+id/text_error"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:text="没有找到"
android:visibility="invisible"/>
</FrameLayout>
</LinearLayout>