点击创建时出现此错误，然后转到注册
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:204)
at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:129)
at com.sixtinbyte.codeexpertise.MainActivity.onCreate(MainActivity.java:49)
单击登录按钮时出错，但我不知道如何在android manifest.xml中使用HomeFragment.class（fragment）
FATAL EXCEPTION: main
Process: com.sixtinbyte.codeexpertise, PID: 18560
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sixtinbyte.codeexpertise/com.sixtinbyte.codeexpertise.HomeFragment}: java.lang.ClassCastException: com.sixtinbyte.codeexpertise.HomeFragment cannot be cast to android.app.Activity
我在这个导航抽屉里拿着导航抽屉我有2个活动loginactivity和mainactivity。当我点击登录按钮然后它转到HomeFragement但它显示错误，当我点击创建一个然后它转到content_main（在这个content_main我有我的注册页面）。但这也显示了错误。
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/app_bar_main"
android:background="@android:color/transparent">
<FrameLayout
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RelativeLayout
android:id="@+id/openDialog"
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal"
android:background="@android:color/holo_red_light"
android:layout_gravity="right|top"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginBottom="112dp">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#555555"
android:singleLine="true"
android:textSize="18dp"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:text="Experiences" />
</RelativeLayout>
<EditText
android:id= "@+id/firstname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="First Name"/>
<EditText
android:id= "@+id/lastname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Last Name"
android:layout_below="@+id/firstname"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="32dp" />
<EditText
android:id="@+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Email"
android:layout_below="@+id/lastname"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="41dp" />
<AutoCompleteTextView
android:id="@+id/autoCompleteTextView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Location"
android:ems="10"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:id="@+id/signup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sign up"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="34dp" />
</RelativeLayout>
MainActivity.xml
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, AdapterView.OnItemSelectedListener, AdapterView.OnItemClickListener {
public EditText firstname, lastname, email;
//private Toolbar toolbar;
AutoCompleteTextView textView=null;
public String emailRegistration;
private ArrayAdapter<String> adapter;
public Button signup;
String item[]={
"Indore", "Ujjain", "Bhopal", "Pune",
"Hyderabad", "Chennai", "Mumbai", "Bangalore",
"Rajkot", "Delhi", "Chandigarh", "Tamil Nadu"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//toolbar.setTitle("toolbar");
setSupportActionBar(toolbar);
textView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, item);
textView.setThreshold(1);
//Set adapter to AutoCompleteTextView
textView.setAdapter(adapter);
textView.setOnItemSelectedListener(this);
textView.setOnItemClickListener(this);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
firstname = (EditText) findViewById(R.id.firstname);
if( firstname.getText().toString().length() == 0 )
firstname.setError("First name is required!" );
lastname = (EditText)findViewById(R.id.lastname);
if( lastname.getText().toString().length() == 0 )
lastname.setError("Last name is required!" );
email = (EditText)findViewById(R.id.email);
// if (!emailRegistration.matches("[a-zA-Z0-9._-]+@[a-z]+.[a-z]+")) {
//
// email.setError("Invalid Email Address");
//
// }
signup = (Button)findViewById(R.id.signup);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
signup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this,HomeFragment.class);
startActivity(intent);
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
setTitle("Home");
HomeFragment homeFragment = new HomeFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,homeFragment).commit();
} else if (id == R.id.nav_gallery) {
setTitle("Edit Profile");
EditFragment editFragment = new EditFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,editFragment).commit();
} else if (id == R.id.nav_slideshow) {
setTitle("Business");
BusinessFragment businessFragment = new BusinessFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,businessFragment).commit();
} else if (id == R.id.nav_manage) {
setTitle("Message");
MessageFragment messageFragment = new MessageFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,messageFragment).commit();
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
// TODO Auto-generated method stub
//Log.d("AutocompleteContacts", "onItemSelected() position " + position);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
InputMethodManager imm = (InputMethodManager) getSystemService(
INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
// TODO Auto-generated method stub
// Show Alert
Toast.makeText(getBaseContext(), "Position:"+i+" Country:"+adapterView.getItemAtPosition(i),
Toast.LENGTH_LONG).show();
Log.d("AutocompleteContacts", "Position:"+i+" Country:"+adapterView.getItemAtPosition(i));
}
}
login.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/holo_orange_dark">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/we_are_here_to_generate_more_business_for_you"
android:textColor="@android:color/white"
android:textSize="18sp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/email"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="79dp"
android:id="@+id/email"
android:inputType="none" />
<EditText
android:id="@+id/text_input_password_toggle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:password="true"
android:hint="@string/password"
android:layout_below="@+id/email"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="45dp" />
<CheckBox
android:id="@+id/ch_rememberme"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/remember_password"
android:layout_below="@+id/text_input_password_toggle"
android:layout_alignLeft="@+id/code"
android:layout_alignStart="@+id/code" />
<Button
android:id="@+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/login"
android:layout_below="@+id/ch_rememberme"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp" />
<TextView
android:id="@+id/text2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="@string/not_a_member_create_one"
android:layout_below="@+id/login"
android:layout_centerHorizontal="true"
android:layout_marginTop="38dp" />
<TextView
android:id="@+id/forgotpassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:text="@string/forgot_password"
android:textAppearance="?android:attr/textAppearanceSmall"
android:layout_below="@+id/text2"
android:layout_centerHorizontal="true"
android:layout_marginTop="49dp" />
<TextView
android:id="@+id/code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/powered_by_code_expertise"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
LoginActivity.xml
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class LoginActivity extends AppCompatActivity {
public EditText email, password;
public TextView textView;
public Button login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
email = (EditText) findViewById(R.id.email);
// if( email.getText().toString().length() == 0 )
// email.setError("Email is required!" );
password = (EditText) findViewById(R.id.text_input_password_toggle);
// if( password.getText().toString().length() == 0 )
// password.setError("Password is required!" );
textView = (TextView) findViewById(R.id.text2);
login = (Button) findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(LoginActivity.this, HomeFragment.class);
startActivity(intent);
}
});
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(LoginActivity.this,MainActivity.class);
startActivity(i);
}
});
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sixtinbyte.codeexpertise">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".LoginActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".MainActivity"></activity>
<activity android:name=".HomeFragment"></activity>
</application>
</manifest>
答案 0 :(得分：0)
你用@ style / AppTheme.NoActionBar添加了主题，它改变了问题用@ style / AppTheme
<activity
android:name=".LoginActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
答案 1 :(得分：0)
更改您的AppTheme，如下所示
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
或者将android:theme="@style/AppTheme.NoActionBar">添加到您的活动