Android 括号后应为类或接口
我无法理解这一点,但OnCreateOptions菜单前面的括号表示它右侧有一个空格,它需要一个类或接口。救命啊,我就是想不出这个!我真的不知道发生了什么事Android 括号后应为类或接口,android,Android,我无法理解这一点,但OnCreateOptions菜单前面的括号表示它右侧有一个空格,它需要一个类或接口。救命啊,我就是想不出这个!我真的不知道发生了什么事 package com.spizer.mizer2; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import andro
package com.spizer.mizer2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ExpandableListView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
public class DifficultyMenu extends AppCompatActivity {
private int T1;
private int T2;
private int T3;
private int T4;
private String S1;
private String S2;
private String S3;
private String S4;
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_difficulty_menu);
// get the list view
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// List view Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "Group Clicked " + listDataHeader.get(groupPosition),
// Toast.LENGTH_SHORT).show();
return false;
}
});
// List view Group expanded listener
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// List view Group collapsed listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// List view on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("AdditionDifficulty");
listDataHeader.add("SubtractionDifficulty");
listDataHeader.add("MultiplicationDifficulty");
listDataHeader.add("DivisionDifficulty");
// Adding child data
List<String> AdditionDifficulty = new ArrayList<String>();
while(true) {
if(T1<10) {
String S1 = Integer.toString(T1);
AdditionDifficulty.add(S1);
T1++;
continue;
}
else {
break;
}
}
List<String> SubtractionDifficulty = new ArrayList<String>();
while(true) {
if(T2<10) {
String S2 = Integer.toString(T2);
SubtractionDifficulty.add(S2);
T2++;
continue;
}
else {
break;
}
}
List<String> MultiplicationDifficulty = new ArrayList<String>();
while(true) {
if(T3<10) {
String S3 = Integer.toString(T3);
MultiplicationDifficulty.add(S3);
T3++;
continue;
}
else {
break;
}
}
List<String> DivisionDifficulty = new ArrayList<String>();
while(true) {
if(T4<10) {
String S4 = Integer.toString(T4);
DivisionDifficulty.add(S4);
T4++;
continue;
}
else {
break;
}
}
listDataChild.put(listDataHeader.get(0), AdditionDifficulty); // Header, Child data
listDataChild.put(listDataHeader.get(1), SubtractionDifficulty);
listDataChild.put(listDataHeader.get(2), MultiplicationDifficulty);
listDataChild.put(listDataHeader.get(3), DivisionDifficulty);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_difficulty_menu, 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);
}
}
package com.spizer.mizer2;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.widget.ExpandableListView;
导入java.util.ArrayList;
导入java.util.HashMap;
导入java.util.List;
导入android.app.Activity;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.ExpandableListView;
导入android.widget.ExpandableListView.OnChildClickListener;
导入android.widget.ExpandableListView.OnGroupClickListener;
导入android.widget.ExpandableListView.OnGroupCollapseListener;
导入android.widget.ExpandableListView.OnGroupExpandListener;
导入android.widget.Toast;
公共类疑难功能表扩展了AppCompactActivity{
私人int T1;
私人INTT2;
私人int T3;
私人int T4;
私有字符串S1;
私有字符串S2;
私有字符串S3;
私有字符串S4;
可扩展列表适配器;
ExpandableListView解释视图;
列表列表数据头;
HashMapListDataChild;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u难度\u菜单);
//获取列表视图
expListView=(ExpandableListView)findViewById(R.id.lvExp);
//准备列表数据
prepareListData();
listAdapter=新的ExpandableListAdapter(此,listDataHeader,listDataChild);
//设置列表适配器
expListView.setAdapter(listAdapter);
//列表视图组单击侦听器
expListView.setOnGroupClickListener(新OnGroupClickListener(){
@凌驾
公共布尔值onGroupClick(ExpandableListView父视图,视图v,
int groupPosition,长id){
//Toast.makeText(getApplicationContext(),
//“组单击”+listDataHeader.get(groupPosition),
//吐司。长度(短)。show();
返回false;
}
});
//列表视图组扩展侦听器
expListView.setOnGroupExpandListener(新的OnGroupExpandListener(){
@凌驾
public void onGroupExpand(int groupPosition){
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition)+“Expanded”,
吐司。长度(短)。show();
}
});
//列表视图组已折叠侦听器
expListView.setOnGroupCollapseListener(新OnGroupCollapseListener(){
@凌驾
公共void-onGroupCollapse(int-groupPosition){
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition)+“折叠”,
吐司。长度(短)。show();
}
});
//子单击侦听器上的列表视图
setOnChildClickListener(新的OnChildClickListener(){
@凌驾
公共布尔onChildClick(ExpandableListView父视图,视图v,
int groupPosition、int childPosition、long id){
//TODO自动生成的方法存根
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+listDataChild.get(
listDataHeader.get(groupPosition)).get(
儿童位置),吐司。长度(短)
.show();
返回false;
}
});
}
/*
*准备列表数据
*/
私有void prepareListData(){
listDataHeader=新的ArrayList();
listDataChild=newHashMap();
//添加子数据
添加(“添加困难”);
添加(“减法难度”);
添加(“乘法难度”);
listDataHeader.add(“division”);
//添加子数据
列表添加难度=新建ArrayList();
while(true){
如果(T1我认为方法前面的第二个大括号是无关的。你的onCreateOptions菜单方法则认为它不属于任何类,这在Java中是不允许的
listDataChild.put(listDataHeader.get(3), DivisionDifficulty);
}
} // Remove me!
@Override
public boolean onCreateOptionsMenu(Menu menu) {
...
}
下面是应用了适当缩进的代码。这更清楚地表明活动类结束得太早了:
package com.spizer.mizer2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ExpandableListView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;
public class DifficultyMenu extends AppCompatActivity {
private int T1;
private int T2;
private int T3;
private int T4;
private String S1;
private String S2;
private String S3;
private String S4;
ExpandableListAdapter listAdapter;
ExpandableListView expListView;
List<String> listDataHeader;
HashMap<String, List<String>> listDataChild;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_difficulty_menu);
// get the list view
expListView = (ExpandableListView) findViewById(R.id.lvExp);
// preparing list data
prepareListData();
listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
// setting list adapter
expListView.setAdapter(listAdapter);
// List view Group click listener
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
// Toast.makeText(getApplicationContext(),
// "Group Clicked " + listDataHeader.get(groupPosition),
// Toast.LENGTH_SHORT).show();
return false;
}
});
// List view Group expanded listener
expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
@Override
public void onGroupExpand(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Expanded",
Toast.LENGTH_SHORT).show();
}
});
// List view Group collapsed listener
expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
@Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition) + " Collapsed",
Toast.LENGTH_SHORT).show();
}
});
// List view on child click listener
expListView.setOnChildClickListener(new OnChildClickListener() {
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
// TODO Auto-generated method stub
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(listDataHeader.get(groupPosition)).get(childPosition), Toast.LENGTH_SHORT)
.show();
return false;
}
});
}
/*
* Preparing the list data
*/
private void prepareListData() {
listDataHeader = new ArrayList<String>();
listDataChild = new HashMap<String, List<String>>();
// Adding child data
listDataHeader.add("AdditionDifficulty");
listDataHeader.add("SubtractionDifficulty");
listDataHeader.add("MultiplicationDifficulty");
listDataHeader.add("DivisionDifficulty");
// Adding child data
List<String> AdditionDifficulty = new ArrayList<String>();
while(true) {
if(T1<10) {
String S1 = Integer.toString(T1);
AdditionDifficulty.add(S1);
T1++;
continue;
}
else {
break;
}
}
List<String> SubtractionDifficulty = new ArrayList<String>();
while(true) {
if(T2<10) {
String S2 = Integer.toString(T2);
SubtractionDifficulty.add(S2);
T2++;
continue;
}
else {
break;
}
}
List<String> MultiplicationDifficulty = new ArrayList<String>();
while(true) {
if(T3<10) {
String S3 = Integer.toString(T3);
MultiplicationDifficulty.add(S3);
T3++;
continue;
}
else {
break;
}
}
List<String> DivisionDifficulty = new ArrayList<String>();
while(true) {
if(T4<10) {
String S4 = Integer.toString(T4);
DivisionDifficulty.add(S4);
T4++;
continue;
}
else {
break;
}
}
listDataChild.put(listDataHeader.get(0), AdditionDifficulty); // Header, Child data
listDataChild.put(listDataHeader.get(1), SubtractionDifficulty);
listDataChild.put(listDataHeader.get(2), MultiplicationDifficulty);
listDataChild.put(listDataHeader.get(3), DivisionDifficulty);
}
} // The problematic brace
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_difficulty_menu, 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);
}
}
package com.spizer.mizer2;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.widget.ExpandableListView;
导入java.util.ArrayList;
导入java.util.HashMap;
导入java.util.List;
导入android.app.Activity;
导入android.os.Bundle;
导入android.view.view;
导入android.widget.ExpandableListView;
导入android.widget.ExpandableListView.OnChildClickListener;
导入android.widget.ExpandableListView.OnGroupClickListener;
导入android.widget.ExpandableListView.OnGroupCollapseListener;
导入android.widget.ExpandableListView.OnGroupExpandListener;
导入android.widget.Toast;
公共类疑难功能表扩展了AppCompactActivity{
私人int T1;
私人INTT2;
私人int T3;
私人int T4;
私有字符串S1;
私有字符串S2;
私有字符串S3;
私有字符串S4;
可扩展列表适配器;
ExpandableListView解释视图;
列表列表数据头;
HashMapListDataChild;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u难度\u菜单);
//获取列表视图
expListView=(ExpandableListView)findViewById(R.id.lvExp);
//准备列表数据
prepareListData();
listAdapter=新的ExpandableListAdapter(此,listDataHeader,listDataChild);
//设置列表适配器
expListView.setAdapter(listAdapter);