java Android Store变量及其在webview链接中的使用

Question

我试图将用户输入的文本字段存储在共享首选项中，并在webview链接中使用该输入

以下是我目前掌握的情况

后勤活动。java

package com.example.app;

import 安卓.app.Activity;
import 安卓.content.SharedPreferences;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.Button;
import 安卓.widget.EditText;
import 安卓.content.Intent;

public class LoginActivity extends Activity {

EditText subdomain;

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

    subdomain = (EditText) findViewById(R.id.subdomain);

    Button btn=(Button)findViewById(R.id.sign_in_button);

    btn.setOnClickListener(new View.OnClickListener()
    {
        public void onClick(View v)
        {
            Intent myIntent = new Intent(LoginActivity.this, 
MainActivity.class);
            LoginActivity.this.startActivity(myIntent);
        }
    });
}

public void saveInfo (View view) {
    SharedPreferences sharedPref = getSharedPreferences("spfile", 
Activity.MODE_PRIVATE);

    SharedPreferences.Editor editor = sharedPref.edit();
    editor.putString("name", YourSchool.getText().toString());
    editor.commit();
}
}

主要活动。java

package com.example.app;

import 安卓.app.Activity;
import 安卓.content.Context;
import 安卓.content.SharedPreferences;
import 安卓.os.Bundle;
import 安卓.view.Menu;
import 安卓.view.MenuItem;
import 安卓.view.View;
import 安卓.webkit.WebSettings;
import 安卓.webkit.WebView;
import 安卓.webkit.WebViewClient;

public class MainActivity extends Activity {

private WebView mWebView;

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

    mWebView = (WebView) findViewById(R.id.activity_main_webview);

    // Force links and redirects to open in the WebView instead of in a 
browser
    mWebView.setWebViewClient(new WebViewClient());

    // Enable Javascript
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);

    // Use remote resource

mWebView.loadUrl("https://"+client_subdomain+".domain.co.uk/texts");

    // Stop local links and redirects from opening in browser instead 
of WebView
    mWebView.setWebViewClient(new MyAppWebViewClient());


}
public void displayData (View view) {
    SharedPreferences sharedPref = getSharedPreferences("spfile", 
Activity.MODE_PRIVATE);
    String client_subdomain = sharedPref.getString("name", "");
}

// Prevent the back-button from closing the app
@Override
public void onBackPressed() {
    if(mWebView.canGoBack()) {
        mWebView.goBack();
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is 
present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}
}

活动\u登录。xml

<LinearLayout 
xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
xmlns:tools="http://schemas.安卓.com/tools"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"
    安卓:gravity="center_horizontal"
    安卓:orientation="vertical"
    安卓:paddingBottom="@dimen/activity_vertical_margin"
    安卓:paddingLeft="@dimen/activity_horizontal_margin"
    安卓:paddingRight="@dimen/activity_horizontal_margin"
    安卓:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.app.LoginActivity">

        <LinearLayout
        安卓:id="@+id/email_login_form"
        安卓:layout_width="match_parent"
        安卓:layout_height="wrap_content"
        安卓:orientation="vertical">

        <EditText
            安卓:id="@+id/YourSchool"
            安卓:layout_width="match_parent"
            安卓:layout_height="wrap_content"
            安卓:hint="Your school"
            安卓:maxLines="1"
            安卓:singleLine="true" />

        <Button
            安卓:id="@+id/sign_in_button"
            style="?安卓:textAppearanceSmall"
            安卓:layout_width="match_parent"
            安卓:layout_height="wrap_content"
            安卓:layout_marginTop="16dp"
            安卓:onClick="webView"
            安卓:text="SIGN IN"
            安卓:textStyle="bold" />

    </LinearLayout>
</ScrollView>
</LinearLayout>

主要活动。xml

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

<WebView
    安卓:id="@+id/activity_main_webview"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent" />

</RelativeLayout>

AndroidManifest。xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:安卓="http://schemas.安卓.com/apk/res/安卓"
package="com.example.app">

<uses-permission 安卓:name="安卓.permission.INTERNET" />

<!-- To auto-complete the email text field in the login form with the 
user's emails -->
<uses-permission 安卓:name="安卓.permission.GET_ACCOUNTS" />
<uses-permission 安卓:name="安卓.permission.READ_PROFILE" />
<uses-permission 安卓:name="安卓.permission.READ_CONTACTS" />

<application
    安卓:allowBackup="true"
    安卓:icon="@drawable/ic_launcher"
    安卓:label="@string/app_name"
    安卓:theme="@安卓:style/Theme.NoTitleBar.Fullscreen">
    <activity
        安卓:name=".MainActivity"
        安卓:label="@string/app_name"></activity>
    <activity
        安卓:name=".LoginActivity"
        安卓:label="@string/title_activity_login">
        <intent-filter>
            <action 安卓:name="安卓.intent.action.MAIN" />

            <category 安卓:name="安卓.intent.category.LAUNCHER" 
/>
        </intent-filter>
    </activity>
</application>

</manifest>

我的问题是，客户端_子域在MainActivity中被标记为红色。当我试图构建这个项目时，我得到了一个错误：找不到符号变量client_子域

我想这可能是我错过的一件小事，但任何帮助都将不胜感激

非常感谢， 山姆

Answer 1

使用SharedPrefence存储变量，如下所示

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putString("your_string_key", yourStringValue);
editor.commit();

然后检索值，如下所示：

SharedPreferences sp = getSharedPreferences("your_prefs", Activity.MODE_PRIVATE);
 String myStringValue = sp.getInt("your_string_key", -1);

使用loadUrl中的变量作为

mWebView.loadUrl("https://"+myStringValue+".mydomain.co.uk");