import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
  private StringBuffer sb;/*截取字符串*/
  private TextView tv1;
  private WebView webv;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    /*獲取文字的ID*/
    tv1=(TextView)findViewById(R.id.wang);
    /*獲取網(wǎng)頁控件的ID*/
    webv=(WebView)findViewById(R.id.web);
    /*new一個字符串*/
    sb=new StringBuffer("http://www.baidu百度百度.com");
    /*刪除包含16 不包含20的字符串*/
    sb.delete(16,20);
    /*把截取的字符串寫入文字id里*/
    tv1.setText(sb);
    /*文字點擊事件*/
    tv1.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        webv.getSettings().setJavaScriptEnabled(true);
        webv.loadUrl("https://www.baidu.com");
        /*網(wǎng)頁*/
        webv.setWebViewClient(new WebViewClient() {
          @Override
          public boolean shouldOverrideUrlLoading(WebView view, String url) {
            //返回值是true的時候控制去WebView打開，為false調(diào)用系統(tǒng)瀏覽器或第三方瀏覽器
            view.loadUrl(url);
            return true;
          }
        });
      }
    });
  }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
  android:layout_width="match_parent" android:layout_height="match_parent"
  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="你的包名地址.MainActivity">
  <TextView
    android:id="@+id/wang"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="www.baidu.com"
    android:layout_centerHorizontal="true"
    />
  <RelativeLayout
    android:id="@+id/l1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/wang"
    android:layout_centerHorizontal="true"
    >
    <TextView
      android:id="@+id/ba"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="百度"
      />
    <ImageView
      android:id="@+id/img"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:src="@drawable/ic_launcher"
      android:layout_toRightOf="@id/ba"
      />
    <TextView
      android:id="@+id/yu"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="百度"
      android:layout_toRightOf="@id/img"
      />
  </RelativeLayout>
  <WebView
    android:id="@+id/web"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@id/l1"
    >
  </WebView>
</RelativeLayout>