Question

我正在使用WebView构建一个Android网络应用，我想为其添加历史记录功能。我似乎无法在其他任何地方找到解决方案，所以如果有人能帮助我，那就太好了。如何让应用在新Activity中保存所有历史记录 (History.java)？

* activity_main.xml *

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".MainActivity" >

<WebView
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="490dp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/editText1" />

<Button
    android:id="@+id/go"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:text="@string/button_fix" />

<EditText
    android:id="@+id/editText1"
    android:layout_width="300dp"
    android:layout_height="200dp"
    android:layout_alignBaseline="@+id/go"
    android:layout_alignBottom="@+id/go"
    android:layout_alignParentLeft="true"
    android:layout_toLeftOf="@+id/go"
    android:ems="10"
    android:hint="@string/type_url" >

    <requestFocus />
</EditText>

</RelativeLayout>`

的 MainActivity.java 的

public class MainActivity extends Activity implements OnClickListener {

private static final String TAG = "blaze web view 2";
private WebView wv;
private Button go;
private EditText url;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    wv = (WebView) findViewById(R.id.webview);
    wv.getSettings().setJavaScriptEnabled(true);
    wv.setWebViewClient(new BlazeWebViewClient());
    wv.getSettings().setBuiltInZoomControls(true);
    wv.getSettings().setSupportMultipleWindows(true);
    wv.getSettings().setSupportZoom(true);
    wv.getSettings().setDisplayZoomControls(false);

    try {
        wv.loadUrl("http://www.google.com");
    } catch (Exception e) {
        e.printStackTrace();
    }

    go = (Button) findViewById(R.id.go);
    go.setOnClickListener(this);

    url = (EditText) findViewById(R.id.editText1);
    url.setOnClickListener(this);

}

@Override
public void onClick(View v) {
    switch (v.getId()) {

    case R.id.go:
        String theWebsite = url.getText().toString();
        if ((theWebsite.isEmpty())) {
            go.setText("GO");
            wv.loadUrl("http://www.google.com");
        }

        else {
            theWebsite = "http://" + url.getText().toString();
            wv.loadUrl(theWebsite);
            go.setText("Home");
        }
        url.setText("");
        break;

    case R.id.editText1:
        go.setText("GO");
        Log.i("EDITTEXT", "EDIT TEXT WAS CLICKED");

    }

}

private class BlazeWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView webview, String Url) {
        webview.loadUrl(Url);
        return true;

    }
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK) && wv.canGoBack()) {
        wv.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

@Override
protected void onStart() {
    super.onStart();
    Log.i(TAG, "On Start");
}

@Override
protected void onRestart() {
    super.onRestart();
    Log.i(TAG, "On Restart");
}

@Override
protected void onPause() {
    super.onPause();
    Log.i(TAG, "On Pause");
}

@Override
protected void onResume() {
    super.onResume();
    Log.i(TAG, "On Resume");
}

@Override
protected void onDestroy() {
    super.onDestroy();
    Log.i(TAG, "On Destroy");
}

@Override
protected void onStop() {
    super.onStop();
    Log.i(TAG, "On Stop");
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    wv.saveState(outState);
    Log.i(TAG, "onSavedInstanceState");
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    wv.restoreState(savedInstanceState);
    Log.i(TAG, "RestoreInstanceState");
}

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

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {

    case R.id.back:
        back();
        return true;

    case R.id.forward:
        forward();
        return true;

    case R.id.refresh:
        refresh();
        return true;

    case R.id.chistory:
        history();
        return true;
    case R.id.History:
        History();
        return true;

    default:
        return super.onOptionsItemSelected(item);
    }

}

private void History() {
    Intent i = new Intent(this, History.class);
    startActivity(i);

}

private void history() {
    wv.clearHistory();
    Log.i("H", "Cleared History");
}

private void refresh() {
    wv.reload();
    Log.i("R", "Page Reloaded");
}

private void forward() {
    wv.goForward();
    Log.i("F", "Page Foward");
}

private void back() {
    wv.goBack();
    Log.i("B", "Page Backward");
}
    }

Answer 1

您是否正在寻找doUpdateVisitedHistory和getVisitedHistory API？第一个让您知道用户何时进入新页面（因此您可以将其保存在历史数据库中），第二个（可选）让您告诉WebView历史数据库的内容，以便访问过的链接具有不同的颜色。然后，您的历史记录活动必须读取您的历史数据库并列出它包含的条目。

android web app中的历史选项

1 个答案: