Android应用实例之有道辞典(WebView)

本软件用了三个控件EditText,Button,WebView

布局文件界面：

4

运行结果：

布局文件代码：

<RelativeLayout 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:background="@drawable/mainbg"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <WebView
        android:id="@+id/wvSearchResult"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignLeft="@+id/etWord"
        android:layout_below="@+id/etWord"
        android:layout_marginTop="22dp"
        android:background="@drawable/bg_roundcorner"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textSize="25sp" />

    <Button
        android:id="@+id/btnSearch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/btnClear"
        android:layout_alignParentTop="true"
        android:background="@drawable/ibsearchword"
        android:onClick="search" />

    <EditText
        android:id="@+id/etWord"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/btnSearch"
        android:layout_marginTop="22dp"
        android:layout_toLeftOf="@+id/btnClear"
        android:background="@android:drawable/edit_text"
        android:ems="10"
        android:singleLine="true"
        android:textColor="#552006"
        android:textColorHint="#782f10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/btnClear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/btnSearch"
        android:text="清空" />

</RelativeLayout>

MainActivity.java  代码:

import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

//查询按钮申明 

private Button btnSearch;

//清空按钮申明
  private Button btnClear;

//输入框申明
  private EditText editText;

//加载数据的WebView申明
  private WebView webView;
  private void SetView() {
   btnSearch=(Button) findViewById(R.id.btnSearch);

//获取布局的几个控件
         btnClear=(Button) findViewById(R.id.btnClear);
         editText=(EditText) findViewById(R.id.etWord);
         webView=(WebView) findViewById(R.id.wvSearchResult);

 //查询按钮添加事件
         btnSearch.setOnClickListener(new Button.OnClickListener(){

    @Override
    public void onClick(View arg0) {
     String strURI = (editText.getText().toString());
     strURI = strURI.trim();

//如果查询内容为空提示
     if (strURI.length() == 0)
      {
     Toast.makeText(MainActivity.this, "查询内容不能为空!", Toast.LENGTH_LONG)
      .show();
       }

 //否则则以参数的形式从http://dict.youdao.com/m取得数据，加载到WebView里.
       else
       {
                String strURL = "http://dict.youdao.com/m/search?keyfrom=dict.mindex&q=" + strURI;
        webView.loadUrl(strURL);
        webView.setWebViewClient(new WebViewClient(){
         public boolean shouldOverrideUrlLoading(WebView view, String url){
               view.loadUrl(url);
               return false;
           }
        
        });
      }
          }
     });

//清空按钮添加事件，将EditText置空
          btnClear.setOnClickListener(new Button.OnClickListener(){

    @Override
    public void onClick(View arg0) {
      editText.setText("");
    }
          
          });
  }
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       SetView();
    }

   
}

注意：设置网络权限部分：

<uses-permission android:name="android.permission.INTERNET"/>