我正在开发一个Android应用程序，虽然它没有编译错误，但在启动它时没有响应。我尝试了几件事，但都没有。当我添加第二个活动时，这个问题就开始了，但我已经尝试删除它，但它仍然失败。
清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="xxx.xxxx.xxx">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:debuggable="false"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<receiver
android:name="xxx.xxx.xxx.Monitor"
android:enabled="true"
android:permission="android.permission.RECIEVE_BOOT_COMPLETED" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
<activity android:name="com.xxx.xxx.MainActivity"
android:configChanges= "orientation|screenSize"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.xxx.xxx.Ajustes"
android:configChanges= "orientation|screenSize"
android:label="@string/app_name">
</activity>
</application>
</manifest>
摇篮
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "xxx.xxxx.xxx"
minSdkVersion 14
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile 'org.jetbrains:annotations-java5:15.0'
compile 'com.android.support:design:26.+'
}
logcat的一部分;
07-18 12:36:05.414 3649-3649/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: xxx.xxx.xxx, PID: 3649
java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx.xxx.xxx/com.xxx.xxx.MainActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
at com.android.internal.policy.PhoneWindow.requestFeature(PhoneWindow.java:338)
at android.app.Activity.requestWindowFeature(Activity.java:3946)
at com.xxx.xxx.MainActivity.onCreate(MainActivity.java:52)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)
异常引用的行是
requestWindowFeature(Window.FEATURE_NO_TITLE);
但是评论它或改变它的可能性并没有解决问题。
MainActivity：
public class MainActivity extends Activity
{
static WebView web;
static String etiqueta;
static String mensaje;
static String si;
Context context=this;
static SharedPreferences datos;
ImageButton boton;
static boolean paisES;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
web = (WebView) findViewById(R.id.webV);
paisES =("ES".equals(Locale.getDefault().getCountry())|| "es".equals(Locale.getDefault().getLanguage()));
//Verificar conexión
if (Conectividad.conectado(this))
{
if(paisES)
{
etiqueta="https://www.xxx.xx/launcher/xxx-xx/?language=es_ES";
}
else
{
etiqueta="https://www.xxx.xx/launcher/xxx-xx/?language=en_US";
}
}
else
{
if(paisES)
{
etiqueta="https://www.xxx.xx/launcher/xxx-xx/?language=es_ES";
mensaje="No tienes conexión ¿Deseas configurar tu conexión a Wi-fi ahora?";
si="Sí";
}
else
{
etiqueta="https://www.xxx.xx/launcher/xxx-xx/?language=en_US";
mensaje="You have no connection. Do you want to configure your Wi-Fi connection?";
si="Yes";
}
dialogWifi(web);
}
//si hay un ID metido, entra directamente al mismo. Si no, va al launcher
if (Leer("ID").equals("vacío")==false)
{
//SEGUIDA DE LA EJECUCIÓN PREVIA
if ("ES".equals(Locale.getDefault().getCountry()))
{
//mensaje = "¿Quieres seguir la ejecución desde el punto en el que lo dejaste?";
//si = "Sí";
//leemos el fichero para saber si hay datos de ejecuciones previas
etiqueta="https://www.xxx.xx/xxx/"+Leer("ID")+"/?mode=autoplay&language=es_ES";
}
else
{
// mensaje = "Do you want to continue the execution from the point you left it?";
//si = "Yes";
etiqueta="https://www.xxx.xx/player/"+Leer("ID")+"/?mode=autoplay&language=en_US";
}
// dialReanudar(web);
}
web=(WebView)findViewById(R.id.webV);
GestionWeb.CrearWeb(etiqueta, web);
GestionWeb.Seguirweb(web);
//Para acelerar el webView
web.getSettings().setCacheMode(web.getSettings().LOAD_NO_CACHE);
web.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
}
public void BotonAjustes()
{
View.OnClickListener aj= new View.OnClickListener()
{
@Override
public void onClick(View view)
{
Intent intent= new Intent(MainActivity.this, Ajustes.class);
startActivity(intent);
}
};
boton= (ImageButton) findViewById(R.id.imageButton7);
boton.setOnClickListener(aj);
}
/**
* Método para preguntarle al usuario si desea configurar el wi-fi o no. en caso afirmativo, se le redirecciona a ajustes
* @param view se necesitará para usar web
*/
public void dialogWifi(View view)
{
AlertDialog.Builder dial= new AlertDialog.Builder(this);
dial.setMessage(mensaje);
dial.setPositiveButton(si, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i)
{
//Abre la configuración de Wi-fi
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
dialogInterface.cancel();
web.reload();
}
});
dial.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i)
{
dialogInterface.cancel();
}
});
dial.create().show();
}
public void dialReanudar(View view)
{
AlertDialog.Builder dial= new AlertDialog.Builder(this);
dial.setMessage(mensaje);
dial.setPositiveButton(si, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i)
{
//En este caso, etiqueta tendrá la web leída
etiqueta=Leer("enelace");
GestionWeb.CrearWeb(etiqueta,web);
dialogInterface.cancel();
}
});
dial.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i)
{
dialogInterface.cancel();
}
});
dial.create().show();
}
public static void Guardar(String guardado, String fichero)
{
SharedPreferences.Editor editor=datos.edit();
editor.putString(fichero, guardado);
editor.commit();
}
public static String Leer(String fichero)
{
String e=datos.getString(fichero, "vacío" ); //(valor que queremos recoger, valor por defecto si no encuentra nada)
return e;
}
}
答案 0 :(得分：1)
您应该在requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
尝试以下方法：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
...
}