Android 1.6 SDK WebView Issue
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26-09-2019 - |
Pergunta
Eu reduzi o problema para a WebView; Minha força de aplicação fecha sempre. Se eu retirar o WebView e colocar um botão de alteração de cor ou algo assim, a troca de caixa funciona e o aplicativo carrega. Sou bastante novo no Plaform, mas estou (principalmente) copio diretamente dos exemplos aqui para o WebViews.
Application.java
package com.xxxx.xxxxx;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
public class Application extends Activity {
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
}
public void myClickHandler(View view) {
WebView engine = (WebView) findViewById(R.id.webview);
switch (view.getId()) {
case R.id.Button1:
engine.loadUrl("http://digg.com");
break;
case R.id.Button2:
engine.loadUrl("http://reddit.com");
break;
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:id="@+id/ScrollParent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout android:id="@+id/MainMenuLayout"
android:layout_width="310px"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:id="@+id/Application"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Application Name..." />
<Button android:id="@+id/Button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Digg"
android:onClick="myClickHandler"/>
<Button android:id="@+id/Button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Reddit"
android:onClick="myClickHandler"/>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<WebView
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
</ScrollView>
Androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.qxmd.ecgguide"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Application"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Solução
Sua raiz de layout é um scrollView com dois nós filhos. O ScrollView suporta apenas um nó filho. Se você olhar para o log do ADB, a exceção jogada quando o seu aplicativo trava informa o seguinte:
Caused by: java.lang.IllegalStateException: ScrollView can host only one direct child
Uma solução possível seria criar um layout único que o ScrollView gerencia e faça com que seus dois linears existentes sejam filhos do novo layout. Aqui está uma modificação direta do seu original main.xml:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:id="@+id/ScrollParent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- new container layout for the original two layouts -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<!-- original first child layout, now a child of the wrapper -->
<LinearLayout android:id="@+id/MainMenuLayout"
android:layout_width="310px"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:id="@+id/Application"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Application Name..." />
<Button android:id="@+id/Button1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Digg"
android:onClick="myClickHandler"/>
<Button android:id="@+id/Button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Reddit"
android:onClick="myClickHandler"/>
</LinearLayout>
<!-- the original second child layout, now also a child of the wrapper -->
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<WebView
android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
</LinearLayout>
</ScrollView>