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();

  }

 }

 }

}