Android 开发之webview页面返回到最顶关闭

public class MyWebViewActivity extends Activity {
private Context context = this;
// 底部菜单View
// public static View bottomView;
private WebViewProgressBar webView;
private String url;
private HtmlBean bean;
// 手势
private GestureDetector mGestureDetector;
private TextView btn_goback;
String title;
@Override
protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  requestWindowFeature(Window.FEATURE_NO_TITLE);
  setContentView(R.layout.usershop_layout);
  MyUtils.checkStrictMode(true);

  url = getIntent().getStringExtra("url");
  if (!TextUtils.isEmpty(title)) {
   TextView tv_title = (TextView) findViewById(R.id.title_text);
   if (title.length() > 6) {
    title = title.substring(0, 6);
   }
   tv_title.setText(title);
  }
  if (TextUtils.isEmpty(url)) {
   Toast.makeText(this, "没有找到相关的链接地址", Toast.LENGTH_LONG).show();
   return;
  }

  initWebView();
  this.initJsInterface();
  initGestureDetector();
}

// 初始化webView
private void initWebView() {
  // 底部菜单
//  bottomView = findViewById(R.id.user_bottom);
  btn_goback=(TextView)findViewById(R.id.btn_goback);
  // WebView
  webView = (WebViewProgressBar) findViewById(R.id.user_webview);
  // 滚动条
  webView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
  // 脚本支持
  webView.getSettings().setJavaScriptEnabled(true);
  // 缩放
  webView.getSettings().setSupportZoom(true);
  webView.loadUrl(url);

  // WebView客户端
  webView.setWebViewClient(new WebViewClient() {
   @Override
   public boolean shouldOverrideUrlLoading(WebView view, String nextUrl) {
    // 下一个链接
    try {
     if(title.equals("个人中心")){
      url=nextUrl;
     }
    } catch (Exception e) {
    }
    view.loadUrl(nextUrl);
    return true;
   }

   // 开始加载
   @Override
   public void onPageStarted(WebView view, String url2, Bitmap favicon) {
    // TODO Auto-generated method stub
   }

   // 加载完毕
   @Override
   public void onPageFinished(WebView view, String url2) {
   }
  });
  btn_goback.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    finish();
   }
  });
  // WebView的滑动事件交个手势处理
  webView.setOnTouchListener(new OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    // TODO Auto-generated method stub
    return mGestureDetector.onTouchEvent(event);
   }
  });
}

// 初始化手势
private void initGestureDetector() {
  mGestureDetector = new GestureDetector(this, new OnGestureListener() {
   @Override
   public boolean onSingleTapUp(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
   }

   @Override
   public void onShowPress(MotionEvent e) {
    // TODO Auto-generated method stub

}

   @Override
   public boolean onScroll(MotionEvent e1, MotionEvent e2,
     float distanceX, float distanceY) {
    // TODO Auto-generated method stub
    return false;
   }

   @Override
   public void onLongPress(MotionEvent e) {
    // TODO Auto-generated method stub

}

   @Override
   public boolean onFling(MotionEvent e1, MotionEvent e2,
     float velocityX, float velocityY) {

return false;
}

   @Override
   public boolean onDown(MotionEvent e) {
    // TODO Auto-generated method stub
    return false;
   }
  }, new Handler() {

});

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
ShareDao.onActivityResult(requestCode, resultCode, data);
super.onActivityResult(requestCode, resultCode, data);

}

public void btn_on(View view){
  if(webView.canGoBack()){
   webView.goBack(); // goBack()表示返回WebV
  }else {
   finish();
  }
}

}

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