android - 如何在webview中搜索文本

Question

我在 android 工作...我是这个领域的新手...我开发了一个 webview...我需要在 webview 中搜索特定文本...我搜索了一些问题，例如 t hi s 但我没有得到正确的答案

我做了这么多代码，但是在执行时显示了 webview，但是我在代码中提供的按钮丢失了

*

private static final int SEARCH_MENU_ID = Menu.FIRST;  

    @Override  
    public boolean onCreateOptionsMenu(Menu menu){  
    super.onCreateOptionsMenu(menu);  

    menu.add(0, SEARCH_MENU_ID, 0, "Search");  

    return true;  
    }  

    public boolean onPrepareOptionsMenu(Menu menu){  
    super.onPrepareOptionsMenu(menu);  
    return true;  
    }  

    public boolean onOptionsItemSelected(MenuItem item){  
    switch(item.getItemId()){  
    case SEARCH_MENU_ID:  
    search();  
    return true;  
    }  
    return true;  
    }  

    public void search(){  
    container = (LinearLayout)findViewById(R.id.lLayout1);  

    nextButton = new Button(this);  
    nextButton.setText("Next"); 
    nextButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            mWebView.findNext(true); 
            // TODO Auto-generated method stub

        }
    });
    container.addView(nextButton);  

    closeButton = new Button(this);  
    closeButton.setText("Close");
    closeButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {




            container.removeAllViews();
            // TODO Auto-generated method stub

        }
    });


    container.addView(closeButton);  

    findBox = new EditText(this);  
findBox.setMinEms(30);  
findBox.setSingleLine(true);  
findBox.setHint("Search"); 
findBox.setOnKeyListener(new OnKeyListener(){  
public boolean onKey(View v, int keyCode, KeyEvent event){  
if((event.getAction() == KeyEvent.ACTION_DOWN) && ((keyCode == KeyEvent.KEYCODE_ENTER))){  
mWebView.findAll(findBox.getText().toString());  

try{  
Method m = WebView.class.getMethod("setFindIsUp", Boolean.TYPE);  
m.invoke(mWebView, true);  
}catch(Exception ignored){}  
}  
return false;  
}  
});


    }
}

*

Answer 1

虽然这是一个较旧的问题，但基于 AndroidEnthusiastic 的版本，我设法整理了一个实际上工作得相当不错的问题。我测试过的 Samsung Note 上的按钮类型存在一个小错误，但无论我如何更改 IME 类型，它都变得一团糟。所以我只是隐藏了软键键盘。但是布局更好。

public class SearchDemoActivity extends ActionBarActivity implements View.OnClickListener
{
WebView mWebView;
private RelativeLayout container;
private Button nextButton, closeButton;
private EditText findBox;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search);
    getActionBar().setTitle(R.string.information_display);
    mWebView = (WebView) findViewById(R.id.webview);
    mWebView.setWebViewClient(new WebViewClient());
    mWebView.loadUrl("http://devemat-androidprogramming.blogspot.com/");

    nextButton = (Button) findViewById(R.id.nextButton);
    closeButton = (Button) findViewById(R.id.closeButton);
    findBox = (EditText) findViewById(R.id.findBox);
    findBox.setSingleLine(true);
    findBox.setOnKeyListener(new OnKeyListener()
    {
        public boolean onKey(View v, int keyCode, KeyEvent event)
        {
            if ((event.getAction() == KeyEvent.ACTION_DOWN) && ((keyCode == KeyEvent.KEYCODE_ENTER)))
            {
                mWebView.findAll(findBox.getText().toString());

                try
                {
                    // Can't use getMethod() as it's a private method
                    for (Method m : WebView.class.getDeclaredMethods())
                    {
                        if (m.getName().equals("setFindIsUp"))
                        {
                            m.setAccessible(true);
                            m.invoke(mWebView, true);
                            break;
                        }
                    }
                }
                catch (Exception ignored)
                {
                }
                finally
                {
                    InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    // check if no view has focus:
                    View vv = getCurrentFocus();
                    if (vv != null)
                    {
                        inputManager.hideSoftInputFromWindow(v.getWindowToken(),
                                InputMethodManager.HIDE_NOT_ALWAYS);
                    }
                }
            }
            return false;
        }
    });
    nextButton.setOnClickListener(this);
    closeButton.setOnClickListener(this);

}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    super.onCreateOptionsMenu(menu);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.searchview_in_menu, menu);
    return true;
}

public boolean onPrepareOptionsMenu(Menu menu)
{
    super.onPrepareOptionsMenu(menu);
    return true;
}

public boolean onOptionsItemSelected(MenuItem item)
{
    switch (item.getItemId())
    {
        case R.id.action_search:
            search();
            return true;
    }
    return true;
}

public void search()
{
    container = (RelativeLayout) findViewById(R.id.layoutId);
    if (container.getVisibility() == RelativeLayout.GONE)
    {
        container.setVisibility(RelativeLayout.VISIBLE);
    }
    else if (container.getVisibility() == RelativeLayout.VISIBLE)
    {
        container.setVisibility(RelativeLayout.GONE);
    }
}

@Override
public void onClick(View v)
{
    if (v == nextButton)
    {
        mWebView.findNext(true);
    }
    else if (v == closeButton)
    {
        container.setVisibility(RelativeLayout.GONE);
    }
}
}

布局 XML (activity_search.xml):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >

<WebView
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/layoutId" />

<RelativeLayout
    android:id="@+id/layoutId"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:visibility="gone" >

    <Button
        android:id="@+id/closeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="Close" />

    <Button
        android:id="@+id/nextButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@+id/closeButton"
        android:text="Next" />

    <EditText
        android:id="@+id/findBox"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@+id/nextButton"
        android:hint="Enter search keyword here."
        android:singleLine="true" />
  </RelativeLayout>

</RelativeLayout>

菜单:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:custom="http://schemas.android.com/apk/res-auto" >

<item
    android:id="@+id/action_search"
    android:icon="@android:drawable/ic_menu_search"
    custom:showAsAction="always"
    android:title="@string/action_search"/>
</menu>