Java 协调器布局无法转换为android.support.v7.widget.Toolbar错误使应用程序崩溃
我正在尝试构建一个导航抽屉活动,每当要显示主活动并使应用程序崩溃时,就会出现此错误 xml代码:Java 协调器布局无法转换为android.support.v7.widget.Toolbar错误使应用程序崩溃,java,android,debugging,Java,Android,Debugging,我正在尝试构建一个导航抽屉活动,每当要显示主活动并使应用程序崩溃时,就会出现此错误 xml代码: <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="?attr/colorPrimaryDark"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/Button_sign_out"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:src="@drawable/ic_arrow_forward_black_24dp"
/>
</android.support.design.widget.CoordinatorLayout>
这是我的java代码:
package com.android.example.ithelpdesk;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
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.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
public DrawerLayout drawer;
public Toolbar supportActionBar;
private boolean mToolBarNavigationListenerIsRegistered = false;
ActionBarDrawerToggle toggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateTicketList();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
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);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView)
findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
ListView listView = (ListView) findViewById(R.id.lvSubcategory);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int
i, long l) {
Intent intent = new Intent(MainActivity.this, ComplaintDetail.class);
startActivity(intent);
}
});
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
/*private void signOut() {
mGoogleSignInClient.signOut()
.addOnCompleteListener(this, new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// ...
}
});
}*/
@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);
}
public void setSupportActionBar(Toolbar supportActionBar) {
this.supportActionBar = supportActionBar;
}
private void populateTicketList() {
ArrayList<Ticket> arrayOfTicket = Ticket.getTicket();
TicketAdapter adapter = new TicketAdapter(this, arrayOfTicket);
ListView listView = (ListView) findViewById(R.id.lvTicket);
listView.setAdapter(adapter);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_complaint) {
Intent intent = new Intent(MainActivity.this, TicketCategory.class);
startActivity(intent);
}
else if (id == R.id.nav_profile) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
}// else if (id == R.id.nav_slideshow) {
// } else if (id == R.id.nav_manage) {
// }
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
package com.android.example.ithelpdesk;
导入android.content.Intent;
导入android.os.Bundle;
导入android.support.design.widget.FloatingActionButton;
导入android.support.design.widget.NavigationView;
导入android.support.v4.view.GravityCompat;
导入android.support.v4.widget.DrawerLayout;
导入android.support.v7.app.ActionBarDrawerToggle;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.Toolbar;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.ListView;
导入java.util.ArrayList;
公共类MainActivity扩展了AppCompatActivity
实现NavigationView.OnNavigationItemSelectedListener{
公共抽屉;
公共工具栏支持操作栏;
私有布尔值mToolBarNavigationListenerIsRegistered=false;
ActionBarDrawerToggle切换;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
populateTicketList();
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
getSupportActionBar().setDisplayShowTitleEnabled(false);
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
ActionBarDrawerToggle切换=新建ActionBarDrawerToggle(
这
抽屉,工具栏,
R.string.navigation\u抽屉\u打开,
R.string.navigation\u drawer\u close
);
抽屉。添加抽屉链接器(切换);
抽屉。设置抽屉定位器(开关);
toggle.syncState();
导航视图导航视图=(导航视图)
findViewById(R.id.nav_视图);
navigationView.setNavigationItemSelectedListener(此);
ListView ListView=(ListView)findViewById(R.id.lvSubcategory);
setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView AdapterView,View,int
i、 长(l){
意向意向=新意向(MainActivity.this、ComplaintDetail.class);
星触觉(意向);
}
});
}
@凌驾
public void onBackPressed(){
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
if(抽屉isDrawerOpen(重力压缩机启动)){
抽屉。关闭抽屉(重力压缩机启动);
}否则{
super.onBackPressed();
}
}
/*私有无效签出(){
mGoogleSignInClient.signOut()
.addOnCompleteListener(这是新的OnCompleteListener(){
@凌驾
未完成的公共void(@NonNull任务){
// ...
}
});
}*/
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
//noinspection SimplifiableIf语句
if(id==R.id.action\u设置){
返回true;
}
返回super.onOptionsItemSelected(项目);
}
公共无效设置支持操作栏(工具栏支持操作栏){
this.supportActionBar=supportActionBar;
}
私有void populateTicketList(){
ArrayList arrayOfTicket=Ticket.getTicket();
TicketAdapter adapter=新的TicketAdapter(此为arrayOfTicket);
ListView ListView=(ListView)findViewById(R.id.lvTicket);
setAdapter(适配器);
}
@SuppressWarnings(“StatementWithEmptyBody”)
@凌驾
公共布尔值onNavigationItemSelected(MenuItem项){
//处理导航视图项单击此处。
int id=item.getItemId();
if(id==R.id.nav_投诉){
意向意向=新意向(MainActivity.this,TicketCategory.class);
星触觉(意向);
}
else if(id==R.id.nav_profile){
意向意向=新意向(此,MainActivity.class);
星触觉(意向);
}//else if(id==R.id.nav_幻灯片){
//}else if(id==R.id.nav_manage){
// }
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
抽屉。关闭抽屉(重力压缩机启动);
返回true;
}
}
来自日志cat的崩溃:
请帮忙。我是一个初学者,因此我也希望能就这个问题给出解释,说明问题是什么,以及今后如何避免
以下是日志:
java.lang.RuntimeException:无法启动活动组件信息{com.android.example.ithelpdesk/com.android.example.ithelpdesk.MainActivity}:java.lang.ClassCastException:android.support.design.widget.CoordinatorLayout无法转换为android.support.v7.widget.Toolbar
在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2455)上
位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2515)
在android.app.ActivityThread.access$1000(ActivityThread.java:154)
在android.app.ActivityThread$H.handleMessage(ActivityThread.java:1379)
位于android.os.Handler.dispatchMessage(Handler.java:102)
位于android.os.Looper.loop(Looper.java:157)
位于android.app.ActivityThread.main(ActivityThread.java:5571)
位于java.lang.reflect.Method.invoke(本机方法)
在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)上
位于com.android.internal.os.ZygoteInit.main(ZygoteInit.java:635)
原因:java.lang.ClassCastException:android.support.design.widget.Coor