android - WebView 的问题...回到以前的 Activity

Question

我有 3 个 Activity - A、B 和 C。我有一个关于 Activity A 的列表，如果我点击它，它会转到 Activity B。在 Activity B 上，我有一个打开 Activity C 的按钮(网络查看器)使用以下代码:

buyButton = (Button) findViewById(R.id.buyButton);

    buyButton.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v)
        {
           System.out.println("!!! buy !!!");

         /*Uri uri = Uri.parse("http://www.google.com");
         Intent intent = new Intent(Intent.ACTION_VIEW, uri);
         startActivity(intent);*/

            Intent startActivity = new Intent(getApplicationContext(), WebViewer.class);
            startActivity.putExtra("link","http://www.google.com");
            startActivityForResult(startActivity, 15);

        }
    });

现在，当我在 Web 查看器 Activity C 上按下后退按钮时， Activity B 也会关闭。我不确定为什么会这样。有什么提示吗？谢谢。

网络查看器代码:

public class WebViewer extends Activity {



ImageButton backButton;


@Override
public void onCreate(Bundle savedInstanceState) {


    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
    setContentView(R.layout.streams);
    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title3);

    String url = "";
    Bundle extras = getIntent().getExtras();
    if(extras !=null) {
        url = extras.getString("link");
    }

    if (!url.startsWith("http://") && !url.startsWith("https://"))
           url = "http://" + url;

    final TextView title=(TextView) findViewById(R.id.title_text_view_success3);
    //title.setText("Saved Streams");

    backButton = (ImageButton) findViewById(R.id.back_button3);

    backButton.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v)
        {
           System.out.println("!!! BACK !!!");
           //finishActivity(0);
           onBackPressed();
        }
    });

    setContentView(R.layout.viewer);
    final WebView webView = (WebView) findViewById(R.id.webview);
    webView.getSettings().setJavaScriptEnabled(true);

    webView.setWebChromeClient(new WebChromeClient() {
        public void onProgressChanged(WebView view, int progress)
        {
            title.setText("Loading...");
            WebViewer.this.setProgress(progress * 100);

            if(progress == 100)
            title.setText(webView.getTitle());
        }
    });

    webView.setWebViewClient(new WebViewClient() {
        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)
        {
            // Handle the error
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
            view.loadUrl(url);
            return true;
        }
    });

    webView.loadUrl(url);


 }



}

Answer 1

像下面这样改变你的代码，

backButton.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v)
        {

if(webView.canGoBack()){
           System.out.println("!!! BACK !!!");

           webView.goBack();
}
        }
    });