Android 错误:(17,41)错误:不兼容的类型:视图无法转换为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.javaAndroid 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
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;
在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代码>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代码>网页视图中的行