Android WebView的使用方法总结

 Android WebView的使用方法

  Android app打开H5页一般要实现如下需求：

1、打开指定url网页；
2、点击链接可以跳转到下一页，并更新标题；
3、按back键或左箭头可以返回上一页；
4、当webview显示的是第一级url时， 按返回键或左箭头关闭当前界面；
5、WebView如何传值给android， 例如使用H5登录成功后返回姓名、token等等字段。
6、支持JavaScript， 支持显示js对话框。
7、无网络时显示默认布局， 以提高用户体验。
8、避免WebView的内存泄漏。

不多说， 看下面代码如何实现上述功能。

参考布局：

示例代码：

public class CommonWebViewActivity extends Activity { 
  private WebView mWebView; 
  private TitleView mTitleView; 
  private RelativeLayout mWebViewContainer; 
  private String title; 
  private String url; 
  private LinearLayout neterrorLayout; 
  private int mFlag;  //来源 
 
  public static final int FLAG_SIGNATURE = 1; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_common_webview_main); 
    initData(); 
    initView(); 
    setData(); 
  } 
 
  @Override 
  protected void onDestroy() { 
    super.onDestroy(); 
    mWebView.setWebViewClient(null); 
    mWebView.setWebChromeClient(null); 
    mWebViewContainer.removeView(mWebView); 
    mWebView.removeAllViews(); 
    mWebView.destroy(); 
  } 
 
  private void initData() { 
    url = getIntent().getStringExtra("url"); 
    title = getIntent().getStringExtra("title"); 
    mFlag = getIntent().getIntExtra("flag", 0); 
  } 
 
  private void initView() { 
    mTitleView = (TitleView) findViewById(R.id.titleView); 
    mWebViewContainer = (RelativeLayout) findViewById(R.id.rl_webViewContainer); 
    neterrorLayout = (LinearLayout) findViewById(R.id.neterror_tip); 
    mWebView = new WebView(getApplicationContext()); 
    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( 
        LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT); 
    mWebViewContainer.addView(mWebView, layoutParams); 
 
    WebSettings webSettings = mWebView.getSettings(); 
    //设置WebView属性，能够执行Javascript脚本 
    webSettings.setJavaScriptEnabled(true); 
    //设置可以访问文件 
    webSettings.setAllowFileAccess(true); 
    //设置支持缩放 
    webSettings.setBuiltInZoomControls(false); 
    //允许js弹出窗口 
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true); 
 
    mTitleView.setLeftBtnClickListener(new TitleView.OnBtnClickListener() { 
      @Override 
      public void onClick(View v) { 
        if (mWebView.canGoBack()) { 
          mWebView.goBack(); 
        } else { 
          finish(); 
        } 
      } 
    }); 
  } 
 
  @Override 
  public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_BACK) { 
      if (mWebView.canGoBack()) { 
        mWebView.goBack(); 
        return true; 
      } 
    } 
    return super.onKeyDown(keyCode, event); 
  } 
 
  private void setData() { 
    mTitleView.setTitle(title); 
    mWebView.loadUrl(url); 
 
    mWebView.setWebChromeClient(new WebChromeClient(){ 
      @Override 
      public boolean onJsAlert(WebView view, String url, final String message, final JsResult result) { 
        //注意，WebView默认不会显示JavaScript的Alert，需要Android实现。 
        runOnUiThread(new Runnable() { 
          @Override 
          public void run() { 
            //自定义美观的Dialog，仅仅是为了显示message 
            CustomDialog.Builder builder = new CustomDialog.Builder(CommonWebViewActivity.this); 
            builder.setTitle("提示"); 
            builder.setMessage(message); 
            builder.setSingle("知道了", new DialogInterface.OnClickListener() { 
              @Override 
              public void onClick(DialogInterface dialogInterface, int i) { 
                dialogInterface.dismiss(); 
              } 
            }); 
            builder.create().show(); 
          } 
        }); 
        result.confirm();//这里必须调用，否则页面会阻塞造成假死 
        return true; 
      } 
 
      @Override 
      public void onReceivedTitle(final WebView view, final String title) { 
        super.onReceivedTitle(view, title); 
        if (FLAG_SIGNATURE == mFlag) { 
          runOnUiThread(new Runnable() { 
            @Override 
            public void run() { 
              mTitleView.setTitle(title); 
            } 
          }); 
        } 
      } 
    }); 
    mWebView.setWebViewClient(new WebViewClient() { 
      @Override 
      public WebResourceResponse shouldInterceptRequest(WebView view, WebResourceRequest request) { 
        if (FLAG_SIGNATURE == mFlag) { 
          Log.d("brycegao", "shouldInterceptRequest url:" + request.getUrl().toString()); 
          if (request.getUrl().toString().contains("wxd://getImage?tenderid=")) { 
            //可以通过url传值给Android， 即在url里放置想要的参数 
            runOnUiThread(new Runnable() { 
              @Override 
              public void run() { 
                setResult(RESULT_OK); 
                finish(); 
              } 
            }); 
          } 
 
        } 
        return super.shouldInterceptRequest(view, request); 
      } 
 
      @Override 
      public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) { 
        mWebView.loadUrl(url); 
        return true; 
      } 
 
      @Override 
      public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) { 
        super.onReceivedError(view, request, error); 
 
        if (FLAG_SIGNATURE == mFlag 
            && request.getUrl().toString().contains("wxd://getImage?tenderid=")) { 
          //do nothing 
          mWebView.setVisibility(View.GONE); //优化体验，避免显示错误信息 
        } else { 
          //加载失败 
          neterrorLayout.setVisibility(View.VISIBLE); 
          mWebView.setVisibility(View.GONE); 
        } 
      } 
    }); 
 
    neterrorLayout.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
        mWebView.setVisibility(View.VISIBLE); 
        neterrorLayout.setVisibility(View.GONE); 
        mWebView.loadUrl(url); 
      } 
    }); 
  } 
} 

以上就是Android Webview的使用方法详解，大家如果有疑问可以留言讨论，或者到本站社区交流，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！