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Android 错误:(17,41)错误:不兼容的类型:视图无法转换为WebView_Android_Webview - Fatal编程技术网

Android 错误:(17,41)错误:不兼容的类型:视图无法转换为WebView

Android 错误:(17,41)错误:不兼容的类型:视图无法转换为WebView,android,webview,Android,Webview,我一直在尝试创建一个链接到网页的按钮,但发现了此错误(错误:(17,41)错误:不兼容类型:视图无法转换为WebView)。我尝试了给出的大多数解决方案,但没有任何效果。编码如下 SettingPage.java package com.example.app.settings.main_class; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import an

我一直在尝试创建一个链接到网页的按钮,但发现了此错误(错误:(17,41)错误:不兼容类型:视图无法转换为WebView)。我尝试了给出的大多数解决方案,但没有任何效果。编码如下

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;


import com.example.app.R;

public class WebView extends Activity {

private WebView webview;

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

    webview = (WebView) findViewById(R.id.webview1);
    webview.getSettings().setJavaScriptEnabled(true);
    webview.loadUrl("http://www.google.com/");

}

private void loadUrl(String s) {
}

private WebSettings getSettings() {
    return null;
}

}
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>

设置\u main\u 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"
/>

gradle构建消息如下所示:

信息:渐变任务[:app:assembleDebug] :app:preBuild :app:compiledbugndk :app:preDebugBuild :app:checkDebugManifest :app:preReleaseBuild :app:prepareCommandroidSupportAppCompatV71800库最新 :app:preparedebug依赖项 :app:compiledBugaidl最新版本 :app:CompiledBugRenderScript最新版本 :app:generateDebugBuildConfig最新 :app:generateDebugAssets最新 ::合并最新的调试资产 :app:generateDebugResValues最新 :app:generateDebugResources最新 :app:mergeDebugResources最新 :app:processDebugManifest最新 :app:processDebugResources最新 :app:generateDebugSources最新 :app:compiledBugJava /Users/mcm/AndroidStudioProjects/MyApp/app/src/main/java/com/example/app/settings/webview/webview.java 错误:(18,41)错误:不兼容的类型:视图无法转换为WebView 注意:某些输入文件使用或覆盖不推荐使用的API。 注意:有关详细信息,请使用-Xlint:deprecation重新编译。 错误:任务“:app:compiledBugJava”的执行失败。 编译失败;有关详细信息,请参阅编译器错误输出。 信息:生成失败 信息:总时间:2.194秒 信息:2个错误 信息:0个警告 信息:请参阅控制台中的完整输出

有人能帮我解决问题吗?谢谢。

这里:

import android.webkit.WebView;
SettingMain
类中,当前正在从Android类导入
WebView
类,而不是您自己创建的类

删除
导入android.webkit.WebView导入并在
SettingMain.java
文件中添加以下导入:

import com.example.app.settings.webview.WebView;

我已经更改了它,但它仍然在以下位置显示错误:webview=(webview)findviewbyd(R.id.webview1);其标记为红色,带有不可转换类型的消息;无法将“android.view.view”强制转换为com.example.app.settings.webview。WebView@marian:哪里有错误?哪个错误?请显示更新后的代码,并确保您已清理,重建和卸载之前的应用程序运行之前,我已经清理,但错误仍然存在。错误:webview=(webview)findViewById(R.id.webview1);其标记为红色,带有不可转换类型的消息;无法将“android.view.view”强制转换为com.example.app.settings.webview.webview更新的代码:import android.app.Activity;导入android.content.Intent;导入android.os.Bundle;导入android.view.view;导入android.view.view.OnClickListener;导入android.widget.Button;导入com.example.app.main\u activity\u class.MainActivity;导入com.example.app.settings.demobility.DifficultyMain;导入com.example.app.settings.lock_system.LockSettings;导入com.example.app.settings.points\u system.PointsSystemMain;导入com.example.app.R;导入com.example.app.settings.relaunch\u system.RelaunchSettings;导入com.example.app.settings.webview.webview@玛丽安:添加
导入android.webkit.WebView网页视图中的行