Meus codigos
MainActibityb.java
package com.example.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.myapplication.R;
import coa.examplea.myaplicationa.Weba;
public class MainActivityb extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.terceiratela);
Button sair=(Button)findViewById(R.iddd.button_iddd);
sair.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{ finishAffinity(); }
});
Button voltar=(Button)findViewById(R.idtf.button_idtf);
voltar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{ finish( ); }
});
}
public void Voltarhttp(View view) {
Intent intentvoltathttp=new Intent(getApplicationContext(), Weba.class);
{ startActivity(intentvoltathttp); }
}
}
terceiratela.XML
<?xml version="1.0" encoding="utf-8"?> <ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center" >
<TextView
android:id="@+id/txt_hello1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="oi" />
<TextView
android:id="@+id/txt_hello1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="aperte aqui para ir para outra tela" />
<Button
android:id="@+idtf/button_idtf"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="@string/button_f"
android:onClick="Voltarf" />
<Button
android:id="@+idhttp/button_idhttp"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="@string/button_t"
android:onClick="Voltarhttp" />
<TextView
android:id="@+id/txt_hello1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="aperte aqui para sair" />
<Button
android:id="@+iddd/button_iddd"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="@string/sair_c" />
Weba.class. java
package coa.examplea.myaplicationa;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.myapplication.R;
public class Weba extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.web);
WebView webview=(WebView)findViewById(R.id.webView);
webview.loadUrl("@string/web_a");
}
}
web.xml
<?xml version="1.0" encoding="utf-8"?>AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"
package=“com.example.myapplication”
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="25" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name="com.example.myapplication.MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.example.myapplication.SegundaTela" />
<activity android:name="com.example.myapplication.MainActivityb" />
<activity android:name="coa.examplea.myaplicationa.Weba" />
</application>
Me expliquem aonde eu estou errando.