Удалить пустую страницу webview

Question

У меня есть приложение, в котором есть кнопка для открытия веб-сайта с использованием браузера по умолчанию. Но когда я нажимаю кнопку «Назад», он не загружается на предыдущую страницу и показывает пустую страницу с WebView, написанную поверх панели действий. Может кто-нибудь помочь мне в том, как удалить эту пустую страницу?

SettingPage.java

package com.example.app.settings.main_class; 



import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.webkit.WebView; 
import android.widget.Button; 

import com.example.app.main_activity_class.MainActivity; 
import com.example.app.settings.difficulty.DifficultyMain; 
import com.example.app.settings.lock_sytem.LockSettings; 
import com.example.app.settings.points_system.PointsSystemMain; 
import com.example.app.R; 
import com.example.app.settings.relaunch_system.RelaunchSettings; 



public class SettingMain extends Activity { 

//Main page for settings 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.setting_main_layout); 
    Button lock = (Button) findViewById(R.id.lock); 

    lock.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Intent i = new Intent(SettingMain.this,  LockSettings.class); 
      startActivity(i); 
     } 
    }); 


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

    relaunch.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View arg0) { 
      // TODO Auto-generated method stub 
      Intent i = new Intent(SettingMain.this, RelaunchSettings.class); 
      startActivity(i); 
     } 
    }); 


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

    points.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent ii = new Intent(SettingMain.this, PointsSystemMain.class); 
      startActivity(ii); 
     } 
    }); 

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

    difficulty.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent ai = new Intent(SettingMain.this,  DifficultyMain.class); 
      startActivity(ai); 
     } 
    }); 

    Button webview = (Button) findViewById(R.id.webview1); 

    webview.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent ai = new Intent(SettingMain.this, WebView.class); 
      startActivity(ai); 
     } 
    }); 

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

    saveexit.setOnClickListener(new OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      finish(); 
     } 
    }); 
} 


@Override 
protected void onPause() { 
    super.onPause(); 
} 
} 

WebView.java

package com.example.app.settings.webview; 

import android.app.Activity; 
import android.os.Bundle; 
import android.webkit.WebSettings; 


public class WebView extends Activity { 

private WebView webview; 

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_web_view); 

    Uri uriUrl = Uri.parse("http://www.dothis.sg/"); 
    Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl); 
    startActivity(launchBrowser); 

} 


} 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.example.app" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="13" 
    android:targetSdkVersion="16" /> 

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 
<uses-permission android:name="android.permission.CAMERA" /> 
<uses-permission android:name="android.hardware.camera.autofocus" /> 

<uses-feature android:name="android.hardware.camera" /> 
<uses-feature android:name="android.hardware.screen.portrait" /> 

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

<application 
    android:allowBackup="true" 
    android:icon="@drawable/dtsfinal" 
    android:label="@string/app_name" 
    android:logo="@drawable/dothisfinal" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name=".main_activity_class.SplashScreen" 
     android:theme="@style/AppBaseTheme3" > 
     <intent-filter android:label="@string/app_name" > 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity 
     android:name=".main_activity_class.MainActivity" 
     android:label="" 
     android:screenOrientation="portrait" /> 
    <activity 
     android:name=".camera.CameraActivity" 
     android:screenOrientation="portrait" /> 
    <activity android:name=".drawing.Colourchoose" /> 
    <activity 
     android:name=".settings.main_class.SettingMain" 
     android:label="@string/app_name" /> 
    <activity android:name=".settings.lock_sytem.LockSettings" /> 
    <activity android:name=".settings.relaunch_system.RelaunchSettings" /> 
    <activity android:name=".settings.points_system.PointsSystemMain" /> 
    <activity android:name=".statistics.StatisticsView" /> 
    <activity android:name=".drawing.BrushSize" /> 
    <activity android:name=".admin.AdminMainPage" /> 
    <activity android:name=".runtime.Runtime_Main" /> 
    <activity android:name=".runtime.ViewAll" /> 
    <activity android:name=".runtime.ViewByDate" /> 
    <activity android:name=".settings.difficulty.DifficultyMain" /> 
    <activity 
     android:name=".awards.ClockAward" 
     android:theme="@style/AppBaseTheme2" /> 
    <activity 
     android:name=".awards.CoinAward" 
     android:theme="@style/AppBaseTheme2" /> 
    <activity 
     android:name=".awards.TrophyAward" 
     android:theme="@style/AppBaseTheme2" /> 

    <receiver 
     android:name=".settings.lock_sytem.MyAdminReceiver" 
     android:permission="android.permission.BIND_DEVICE_ADMIN" > 
     <meta-data 
      android:name="android.app.device_admin" 
      android:resource="@layout/admin" /> 

     <intent-filter> 
      <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" /> 
     </intent-filter> 
    </receiver> 
    <receiver  android:name=".settings.relaunch_system.OnRelaunchReceive" /> 
    <receiver android:name=".settings.lock_sytem.OnLockReceive" /> 

    <activity 
     android:name=".settings.webview.WebView" 
     android:label="@string/title_activity_web_view" > 
    </activity> 
</application> 

</manifest> 

setting_main_layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/LinearLayout1" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/ln1" 
    android:gravity="center"> 


    <Button 
     android:id="@+id/lock" 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 

     android:text="Lock Settings" /> 
</LinearLayout> 

<LinearLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/ln2" 
    android:gravity="center" 
    android:layout_below="@+id/ln1"> 



    <Button 
     android:id="@+id/relaunch" 
     style="?android:attr/buttonStyleSmall" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="Relaunching app settings" /> 
</LinearLayout> 

<Button 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="Points" 
    android:layout_below="@+id/ln2" 
    android:id="@+id/points" /> 

<Button 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="Select Difficulty" 
    android:layout_below="@+id/points" 
    android:id="@+id/difficulty" /> 

<Button 
    style="?android:attr/buttonStyleSmall" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:text="Visit DoThis Website" 
    android:layout_below="@+id/difficulty" 
    android:id="@+id/webview1" /> 


<Button 
    android:layout_width="fill_parent" 
    android:layout_height="50dp" 
    android:textColor="#ff00f4ff" 
    android:background="#ff2f2f2f" 
    android:layout_alignParentBottom="true" 
    android:text="Save and Exit" 
    android:id="@+id/saveexit" /> 


</RelativeLayout> 

activity_web_view.xml

<?xml version="1.0" encoding="utf-8"?> 
<WebView xmlns:android="http://schemas.android.com/apk/res/android" 
android:id="@+id/webview1" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
/> 

может кто-нибудь помочь мне с некоторыми решениями? Спасибо.

Answer 1

Здесь:

Uri uriUrl = Uri.parse("http://www.dothis.sg/"); 
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl); 
startActivity(launchBrowser); 

Средства запуска браузера устройство для загрузки URL. to remove this blank page нужно вызвать метод отделки() деятельности только после вызова startActivity:

Uri uriUrl = Uri.parse("http://www.dothis.sg/"); 
Intent launchBrowser = new Intent(Intent.ACTION_VIEW, uriUrl); 
startActivity(launchBrowser); 
this.finish(); 

Suggestion: Поскольку activity_web_view раскладка также не содержат WebView, то нет необходимости открывать браузер устройства для отображения URL. просто позвоните WebView.loadUrl:

setContentView(R.layout.activity_web_view); 
webview=(WebView)findViewById(R.id. webview1); 
webview.loadUrl("http://www.dothis.sg/");