java - onPageFinished 内的 prefs.putBoolean

Question

我有以下内容成功地正确修改了 boolean 值的状态:

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

    wv = (WebView) findViewById(R.id.wv);
    //Enable JavaScript
    wv.getSettings().setJavaScriptEnabled(true);
    wv.setFocusable(true);
    wv.setFocusableInTouchMode(true);
    //Set Render Priority To High
    wv.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    wv.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
    wv.getSettings().setDomStorageEnabled(true);
    wv.getSettings().setDatabaseEnabled(true);
    wv.getSettings().setAppCacheEnabled(true);
    wv.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

    //Load Url
    wv.loadUrl("https://str8red.com/");
    wv.setWebViewClient(new myWebClient());

    SharedPreferences.Editor prefs = PreferenceManager.getDefaultSharedPreferences(this).edit();
    prefs.putBoolean("notifications_team_pick",false);
    prefs.putBoolean("notifications_results", false);

    prefs.commit();

}

但是，当我希望在下面的代码中的 onPageFinished 中设置 boolean 值的状态时，会出现错误:

public class myWebClient extends WebViewClient {

    @Override
    public void onPageFinished(WebView view, String url) {
        // TODO Auto-generated method stub
        super.onPageFinished(view, url);

        String CurrentURL = wv.getUrl();

        if (CurrentURL == "https://str8red.com/") {
            wv.evaluateJavascript("fromAndroid()", new ValueCallback<String>() {
                @Override
                public void onReceiveValue(String value) {
                    String[] separated = value.split(" ");
                    //separated[0]; // logged in True Or False
                    //separated[1]; // Notifications 1 or 0
                    //separated[2]; // More Notifications or 1 or 0
                    String loggedIn = separated[0].replace("\"", "");
                    String Notify1 = separated[1].replace("\"", "");
                    String Notify2 = separated[2].replace("\"", "");

                    SharedPreferences.Editor prefs = PreferenceManager.getDefaultSharedPreferences(this).edit();
                    prefs.putBoolean("notifications_team_pick",false);
                    prefs.putBoolean("notifications_results", true);

                    prefs.commit();
                }
            });
        }
    }
}

最终的结果是让“Notify1”和“Notify2”设置 boolean 值的状态。但第一步只是在 onPageFinished 运行后设置 boolean 值的状态。

我希望我已经正确解释了自己，任何帮助将不胜感激。非常感谢，艾伦。

完整代码:

package com.str8red.str8red;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.webkit.ValueCallback;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;


public class MainActivity extends AppCompatActivity {
    WebView wv;
    Boolean fish;
    Boolean shark;

    // When Back Pressed Go Back
    @Override
    public void onBackPressed() {
        if (wv.canGoBack()) {
            wv.goBack();
        } else {
            super.onBackPressed();
        }
    }

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

        wv = (WebView) findViewById(R.id.wv);
        //Enable JavaScript
        wv.getSettings().setJavaScriptEnabled(true);
        wv.setFocusable(true);
        wv.setFocusableInTouchMode(true);
        //Set Render Priority To High
        wv.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
        wv.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
        wv.getSettings().setDomStorageEnabled(true);
        wv.getSettings().setDatabaseEnabled(true);
        wv.getSettings().setAppCacheEnabled(true);
        wv.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

        //Load Url
        wv.loadUrl("https://str8red.com/");
        // wv.setWebViewClient(new myWebClient());
        wv.setWebViewClient(new myWebClient(this));

        SharedPreferences.Editor prefs = PreferenceManager.getDefaultSharedPreferences(this).edit();
        prefs.putBoolean("notifications_team_pick",false);
        prefs.putBoolean("notifications_results", false);

        prefs.commit();


    }



    public class myWebClient extends WebViewClient {

        private Context context;

        public myWebClient(Context context) {
            this.context = context;
        }

        @Override
        public void onPageFinished(WebView view, String url) {
            // TODO Auto-generated method stub
            super.onPageFinished(view, url);

            String CurrentURL = wv.getUrl();

            if (CurrentURL == "https://str8red.com/") {
                wv.evaluateJavascript("fromAndroid()", new ValueCallback<String>() {
                    @Override
                    public void onReceiveValue(String value) {
                        String[] separated = value.split(" ");
                        //separated[0]; // logged in True Or False
                        //separated[1]; // Notifications 1 or 0
                        //separated[2]; // More Notifications or 1 or 0
                        String loggedIn = separated[0].replace("\"", "");
                        String Notify1 = separated[1].replace("\"", "");
                        String Notify2 = separated[2].replace("\"", "");

                        SharedPreferences.Editor prefs = PreferenceManager.getDefaultSharedPreferences(context).edit();
                        prefs.putBoolean("notifications_team_pick",false);
                        prefs.putBoolean("notifications_results", true);

                        prefs.commit();
                    }
                });
            }
        }
    }

    //Settings Button
    public void btnSettings_onClick(View view) {
        Intent intent=new Intent(this,SettingsActivity.class);
        startActvity(intent);
    }

    private void startActvity(Intent intent) {
        startActivity(intent);
    }
    //End of Settings Button

    //Play Button

    public void btnPlay_onClick(View view) {
        wv.loadUrl("https://str8red.com/selectteams/0/0");
        wv.setWebViewClient(new myWebClient());
    }
    //End of Play Button

}

Answer 1

您应该在 PreferenceManager.getDefaultSharedPreferences(context) 中传递一个 context 作为参数。

您传递的this是WebViewClient。

有一个接受 myWebClient 中的 Context 的构造函数。

private Context context;

public myWebClient(Context context) {
   this.context = context;
}

@Override
public void onPageFinished(WebView view, String url) {
 .....

     SharedPreferences.Editor prefs = PreferenceManager.getDefaultSharedPreferences(context).edit();

}

并在创建 WebViewClient 时传递上下文:

wv.setWebViewClient(new myWebClient(this));