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| 一開始的畫面 |
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| 正在讀取網頁中 |
為取得網路的權限, 記得在Manifest.xml加上<uses-permission android:name="android.permission.INTERNET"/>, 按下ImageButton後會產生兩種結果:
1. 正確load到網頁－>透過Handler關掉Progress
2. 沒有訊號or網路太慢－>透過Handler關掉Progress
本範例設計超過15秒仍未載到網頁則判定為情況2., 然後用Toast提示user稍候再試.
另外在主程式中加入checkInternet(android.content.Context context)來判定Device目前有無網路服務, Manifest.xml要先加入<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>喔!
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| 網頁讀取完畢！會主動關掉Progress哦 |
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| 超過15秒了還沒下載完 |
package com.tsots.WebView_loadUrl;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.Toast;
public class WebView_loadUrl extends Activity
{
Context context = WebView_loadUrl.this;
ProgressDialog myDialog = null;
ImageButton mImageButton1;
EditText mEditText1;
ProgressBar progressbar;
WebView mWebView1;
String TAG = "WebView_loadUrl.this";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mImageButton1 = (ImageButton)findViewById(R.id.myImageButton1);
mEditText1 = (EditText)findViewById(R.id.myEditText1);
mEditText1.setText("http://www.eprice.com.tw/");
progressbar = (ProgressBar) findViewById (R.id.progressbar1);
mWebView1 = (WebView) findViewById(R.id.myWebView1);
final String str_dialog_title = getResources().getString(R.string.str_dialog_title);
mWebView1.setWebViewClient(new WebViewClient()
{
@Override
public void onPageFinished(WebView view, String url)
{
handler.sendEmptyMessage(0);
super.onPageFinished(view, url);
}
});
mImageButton1.setOnClickListener(new ImageButton.OnClickListener()
{
public void onClick(View arg0)
{
{
//mImageButton1.setImageResource(R.drawable.ok_2);
mImageButton1.setBackgroundDrawable(getResources().getDrawable(R.drawable.ok_2));
if (checkInternet(context) == true)
{
String strURI = (mEditText1.getText().toString());
progressbar.setVisibility(View.VISIBLE);
myDialog = ProgressDialog.show
(
context,
str_dialog_title,
getString(R.string.load)+strURI,
true
);
/*
* 1. 當使用者按下button後, 顯示Progress Bar
* 2. 擷取網路資料
* 需在Manifest.xml加入權限：INTERNET
*/
mWebView1.setVisibility(View.VISIBLE);
mWebView1.loadUrl(strURI);
fun_thread();
}
else
{
Toast.makeText(context, getResources().getString(R.string.toast_check_network), Toast.LENGTH_SHORT).show();
}
}
}
});
}
public void fun_thread()
{
new Thread()
{
public void run()
{
try
{
//若15後仍未讀到網頁, 則顯示網路雍塞中
for(int i=0; i<15; i++)
{
sleep(1000);
}
}
catch (Exception e)
{
e.printStackTrace();
}
//為了能與handler建立關聯進而控制Progress Dialog / Progress Bar的關閉
Message m = new Message();
Bundle b = m.getData();
b.putInt("WHICH", 1);
m.setData(b);
handler.sendMessage(m);
}
}.start();
}
/*
* 透過Handler將Progress Dialog / Progress Bar關閉
*/
Handler handler = new Handler()
{
public void handleMessage(Message msg)
{
int which = msg.getData().getInt("WHICH");
progressbar.setVisibility(View.GONE);
myDialog.dismiss();
if(which == 1)
{
Toast.makeText(context, getString(R.string.str_busy), Toast.LENGTH_SHORT).show();
}
}
};
/*
* 判別網路連線狀態
* 需在Manifest.xml加入權限：ACCESS_NETWORK_STATE
*/
public boolean checkInternet(android.content.Context context)
{
boolean result = false;
ConnectivityManager connManager = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE);
NetworkInfo info = connManager.getActiveNetworkInfo();
if (info == null || !info.isConnected())
{
Log.d(TAG, "info == null || !info.isConnected()");
result = false;
}
else
{
if (!info.isAvailable())
{
Log.d(TAG, "!info.isAvailable()");
result = false;
}
else
{
Log.d(TAG, "info.isAvailable()");
result = true;
}
}
return result;
}
}
