Android使用WebView.loadUri()打开网页的方法

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.webkit.WebView;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;public class A07Activity extends Activity { private EditText et;//用来输入网址 private ImageButton ib;//用来触发打开网页的事件 private WebView wv;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    et=(EditText)findViewById(R.id.et);    ib=(ImageButton)findViewById(R.id.ib);    wv=(WebView)findViewById(R.id.wv);    ib.setImageResource(R.drawable.start);//加载ImageButton的按钮图片    ib.setOnClickListener(new OnClickListener(){  @Override  public void onClick(View v) {  // TODO Auto-generated method stub  String s=et.getText().toString();//获得网址  wv.loadUrl(s);//把网址传入  Toast.makeText(A07Activity.this, "百度一下，你就知道", Toast.LENGTH_LONG).show();  }    });  }}