我目前正在Android Studio上创建一个应用。
我在同一活动中使用了不同的按钮(在同一活动中)。问题在于,一个按钮就可以正常工作,但是当我添加另一个按钮时,模拟器会崩溃。
这是我的代码:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start);
defineButtons();
}
public void defineButtons() {
findViewById(R.id.next1).setOnClickListener(buttonClickListener);
findViewById(R.id.next2).setOnClickListener(buttonClickListener);
findViewById(R.id.next3).setOnClickListener(buttonClickListener);
}
private View.OnClickListener buttonClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.next1:
Intent Next1 = new Intent (Start.this, Next1.class);
startActivity(Next1);
break;
case R.id.next2:
Intent Next2 = new Intent (Start.this, Next2.class);
startActivity(Next2);
break;
case R.id.next3:
Intent Next3 = new Intent (Start.this, Next3.class);
startActivity(Next3);
break;
}
}
};
这里是XML:
<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"
tools:context=".Start"
android:background="@drawable/background">
<TextView
android:layout_width="match_parent"
android:layout_height="700px"
android:id="@+id/statement"
android:text="TEXT1"
android:background="@drawable/button_border"
android:textColor="#000000"
android:alpha="0.95"
android:layout_marginHorizontal="70px"
android:layout_marginTop="180px"
android:gravity="center"
android:paddingHorizontal="50px"
android:textSize="16sp"
/>
<Button
android:id="@+id/next1"
style="@style/Widget.AppCompat.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="150px"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="160dp"
android:layout_marginHorizontal="70px"
android:alpha="0.9"
android:background="@drawable/button_border"
android:text="TEXT2"
android:textColor="@android:color/black"
android:textSize="16sp"
android:textAllCaps="false"/>
<Button
android:id="@+id/next2"
style="@style/Widget.AppCompat.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="150px"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="90dp"
android:layout_marginHorizontal="70px"
android:alpha="0.9"
android:background="@drawable/button_border"
android:text="TEXT3"
android:textColor="@android:color/black"
android:textSize="16sp"
android:textAllCaps="false"/>
<Button
android:id="@+id/next3"
style="@style/Widget.AppCompat.Button.Borderless"
android:layout_width="match_parent"
android:layout_height="150px"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="20dp"
android:layout_marginHorizontal="70px"
android:alpha="0.9"
android:background="@drawable/button_border"
android:text="TEXT4"
android:textColor="@android:color/black"
android:textSize="16sp"
android:textAllCaps="false"/>
</RelativeLayout>
我知道这很麻烦,我是编程新手。
答案 0 :(得分:3)
您的代码非常好,您只需要在清单文件中声明这样的Next2和Next3活动
const cartesian = (xs, ys, ...zs) => ys
? cartesian([].concat(...xs.map(x => ys.map(y => [].concat(x, y)))), ...zs)
: xs;
const toObj = xs => xs.reduce((a, b) => Object.assign(a, b), {})
const toNames = people => people.map(person => Object.keys(person)
.filter(name => ['name', 'short'].includes(name))
.map(name => ({[person[name]]: person.city}))
)
const nameCombos = people => cartesian.apply(null, toNames(people)).map(toObj)
const people = [
{ name: "Robert", city: "New York", short: "Bob" },
{ name: "Allison", city: "Los Angeles", short: "Ally" },
{ name: "James", city: "Chicago", short: "Jim" },
{ name: "Hannah", city:"Toronto" },
{ name: "Elizabeth", city: "London" }
]
console.log(nameCombos(people))
Android从清单文件中读取您的应用程序组件,有关更多详细信息,请参考此链接https://developer.android.com/guide/topics/manifest/manifest-intro