現(xiàn)在的實際項目中一般是少不了混合開發(fā)的，通常加載頁面我們都需要一個WebView，為了美觀我們還需要一個用于顯示當前加載進度的進度條傻昙。接下來就看看我們自定義的WebView：

**
 * Created by SerryWang
 * on 2018/8/23
 */
public class ProgressWebView extends WebView {

    private ProgressBar progressBar;
    private Context context;
    public ProgressWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        progressBar = new ProgressBar(context,null,android.R.attr.progressBarStyleHorizontal);
        progressBar.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,3));//設置寬高屬性
        addView(progressBar);
        //設置內(nèi)部加載器
        setWebChromeClient(new MyWebChromeClient(context,progressBar));
        setWebViewClient(new MyWebViewClient());
    }
}

代碼說明：

我們將一個progressBar添加到我們的WebView中去井厌∶氤啵可是哪里可以監(jiān)聽加載進度的變化了，這個時候我們就要重寫WebChromeClient;
WebChromeClient:

/**
 * Created by SerryWang
 * on 2018/8/23
 */
public class MyWebChromeClient extends WebChromeClient {

    private Context context;
    private ProgressBar progressBar;


    public MyWebChromeClient(Context context, ProgressBar progressBar){
        this.context = context;
        this.progressBar = progressBar;
    }


    //監(jiān)聽進度的回調(diào)
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        if(newProgress == 100){
            progressBar.setVisibility(View.GONE);
        }else{

            if(progressBar.getVisibility() == View.GONE){
                progressBar.setVisibility(View.VISIBLE);
                progressBar.setProgress(newProgress);
            }
        }
        super.onProgressChanged(view, newProgress);
    }
}

可以看到構造方法中接收progressBar,在onProgressChanged中實現(xiàn)對進度的監(jiān)聽痹愚。
于此同事為了不使用外部瀏覽器翔始，我們還要重寫WebViewClient.
WebViewClient:

/**
 * Created by SerryWang
 * on 2018/8/23
 */
public class MyWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
        view.loadUrl(request.getUrl().toString());
        return true;
    }
}

最后記得防止WebView的內(nèi)存泄漏，所以應該伴隨Activity或者Fragment的生命周期里伯。

public class WebActivity extends AppCompatActivity {

    private LinearLayout mLinearLayout;
    private AgentWeb mAgentWeb;
    private ToolBarView toolBarView;
    private WebView webView;
    private ProgressWebView progressWebView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web);
        initView();
        LoadUrl();
    }

    private void LoadUrl() {
        progressWebView.getSettings().setJavaScriptEnabled(true);
        progressWebView.loadUrl("file:///android_asset/detaillss/index.html");
    }

    private void initView() {

        mLinearLayout = findViewById(R.id.mLinearLayout);
        toolBarView   = findViewById(R.id.WebTool);
        progressWebView = findViewById(R.id.Web);
        toolBarView.setmNavigationTip(Constant.Toolbar_Title);

    }

    @Override
    protected void onPause() {

        if(progressWebView!=null){
            progressWebView.pauseTimers();
            progressWebView.onPause();
        }

        super.onPause();
    }

    @Override
    protected void onResume() {
        if(progressWebView != null){
            progressWebView.onResume();
        }
        super.onResume();
    }

    @Override
    protected void onDestroy() {
       if(progressWebView != null){
           progressWebView.stopLoading();
           progressWebView.removeAllViews();
           progressWebView.setWebViewClient(null);
           progressWebView.setWebChromeClient(null);
           unregisterForContextMenu(progressWebView);
           progressWebView.destroy();
       }
        super.onDestroy();
    }
}