单击一个按钮,将启动一个弹出菜单,然后我单击一个弹出菜单项,然后所选项目将显示在 android studio 中的按钮文本上
click on a button, a popup menu will start, and then I click on a popup menu item then selected item will show on buttontext in android studio
我想点击一个按钮然后弹出菜单会出现然后我
单击弹出菜单项,弹出菜单项将显示在
按钮作为按钮文本。假设有一个按钮,按钮文本是"YourEmail"。然后我点击按钮,弹出菜单将启动,当我点击弹出菜单项时,该项目将显示在按钮上作为按钮文本。
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="com.example.application.popupproject.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showPopup"
android:text="show popup"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java,这里我想将按钮中的项目菜单显示为按钮文本:
package com.example.application.popupproject;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements PopupMenu.OnMenuItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void showPopup(View v) {
PopupMenu popup = new PopupMenu(this, v);
popup.setOnMenuItemClickListener(this);
popup.inflate(R.menu.popup_menu);
popup.show();
}
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item1:
Toast.makeText(this, "Item 1 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item2:
Toast.makeText(this, "Item 2 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item3:
Toast.makeText(this, "Item 3 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item4:
Toast.makeText(this, "Item 4 clicked", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
}
首先添加一个按钮id,然后创建一个按钮对象并link它到activity_main.xml中的按钮。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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="com.example.application.popupproject.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button1":
android:onClick="showPopup"
android:text="show popup"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java
package com.example.application.popupproject;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements
PopupMenu.OnMenuItemClickListener {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
}
public void showPopup(View v) {
PopupMenu popup = new PopupMenu(this, v);
popup.setOnMenuItemClickListener(this);
popup.inflate(R.menu.popup_menu);
popup.show();
}
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item1:
Toast.makeText(this, "Item 1 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item 1");
return true;
case R.id.item2:
Toast.makeText(this, "Item 2 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item2");
return true;
case R.id.item3:
Toast.makeText(this, "Item 3 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item3");
return true;
case R.id.item4:
Toast.makeText(this, "Item 4 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item4")
return true;
default:
return false;
}
}
}
我想点击一个按钮然后弹出菜单会出现然后我 单击弹出菜单项,弹出菜单项将显示在 按钮作为按钮文本。假设有一个按钮,按钮文本是"YourEmail"。然后我点击按钮,弹出菜单将启动,当我点击弹出菜单项时,该项目将显示在按钮上作为按钮文本。
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="com.example.application.popupproject.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="showPopup"
android:text="show popup"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java,这里我想将按钮中的项目菜单显示为按钮文本:
package com.example.application.popupproject;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements PopupMenu.OnMenuItemClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void showPopup(View v) {
PopupMenu popup = new PopupMenu(this, v);
popup.setOnMenuItemClickListener(this);
popup.inflate(R.menu.popup_menu);
popup.show();
}
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item1:
Toast.makeText(this, "Item 1 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item2:
Toast.makeText(this, "Item 2 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item3:
Toast.makeText(this, "Item 3 clicked", Toast.LENGTH_SHORT).show();
return true;
case R.id.item4:
Toast.makeText(this, "Item 4 clicked", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
}
首先添加一个按钮id,然后创建一个按钮对象并link它到activity_main.xml中的按钮。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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="com.example.application.popupproject.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button1":
android:onClick="showPopup"
android:text="show popup"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
MainActivity.java
package com.example.application.popupproject;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.PopupMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements
PopupMenu.OnMenuItemClickListener {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
}
public void showPopup(View v) {
PopupMenu popup = new PopupMenu(this, v);
popup.setOnMenuItemClickListener(this);
popup.inflate(R.menu.popup_menu);
popup.show();
}
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.item1:
Toast.makeText(this, "Item 1 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item 1");
return true;
case R.id.item2:
Toast.makeText(this, "Item 2 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item2");
return true;
case R.id.item3:
Toast.makeText(this, "Item 3 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item3");
return true;
case R.id.item4:
Toast.makeText(this, "Item 4 clicked",
Toast.LENGTH_SHORT).show();
button.setText("item4")
return true;
default:
return false;
}
}
}