[英]Trying to link an activity from a listActivity
我有一个列表菜单,可以链接到另一个列表菜单并链接到称为计数器的活动中。 但是柜台不断抛出异常,没有向我展示实际的柜台活动
这是下面的代码
package com.example.taekwondobuddy.util;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Tools extends ListActivity{
String classes[] = {"Counter","Accelermeter","Timer"} ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Tools.this, android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String cheese = classes[position];
try{
Class ourclass = Class.forName("com.example.taekwondobuddy.util" + cheese);
Intent ourIntent = new Intent(Tools.this, ourclass);
startActivity(ourIntent);
} catch(ClassNotFoundException e){
e.printStackTrace();
}
}
}
工具类
package com.example.taekwondobuddy.util;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Tools extends ListActivity{
String classes[] = {"Counter","Accelermeter","Timer"} ;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Tools.this, android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String cheese = classes[position];
try{
Class ourclass = Class.forName("com.example.taekwondobuddy.util" + cheese);
Intent ourIntent = new Intent(Tools.this, ourclass);
startActivity(ourIntent);
} catch(ClassNotFoundException e){
e.printStackTrace();
}
}
}
柜台班
package com.example.taekwondobuddy.util;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
公共类Counter扩展Activity {
int counter;
Button add;
Button sub;
TextView display;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.counter);
counter = 0;
add = (Button) findViewById(R.id.button1);
sub = (Button) findViewById(R.id.button2);
display = (TextView) findViewById(R.id.tvDisplay);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
display.setText("Counter: " + counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
display.setText("Counter: " + counter);
}
});
}
}
和counter.xml(如果有帮助的话)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Counter: 0"
android:textSize="45dp"
android:layout_gravity="center"
android:id="@+id/tvDisplay"
></TextView>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="150dp"
android:text="Add" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginTop="25dp"
android:text="Subtract" />
</RelativeLayout>
我看不出任何想法有什么错?
Class ourclass = Class.forName("com.example.taekwondobuddy.util" + cheese);
在此行中附加“。” 奶酪之前
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