处理菜单项点击事件 - Android
我想创建一个意图,在单击菜单项后启动新活动,但我不确定如何执行此操作。我一直在阅读 android 文档,但我的实现不正确......并且一些正确方向的指导会有所帮助。我在下面列出了我的代码并注释掉了我的问题区域,我认为我调用了错误的方法。
package com.jbsoft.SimpleFlashlight;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.*;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.Button;
import android.widget.Toast;
public class SimpleFlashLightActivity extends Activity {
Button GreenButton; // Declare instances of buttons to use later
Button BlueButton;
private static final int OK_MENU_ITEM = Menu.FIRST;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BlueButton = (Button) findViewById(R.id.bluebutton);
BlueButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Display msg when user clicks Blue Button
showColorChangeMsg();
// Switch Activities on click
Intent blueintent = new Intent(SimpleFlashLightActivity.this,
BlueFlashLightActivity.class);
startActivity(blueintent);
}
});
//Install listener for second button
GreenButton = (Button) findViewById(R.id.greenbutton);
GreenButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Display msg when user clicks Green Button
showColorChangeMsg();
Intent greenintent = new Intent(SimpleFlashLightActivity.this,
GreenFlashLightActivty.class);
startActivity(greenintent);
}
});
;
/**************************************************************************************/
// Method Declarations // THIS IS WHERE I'M HAVING A PROBLEM
MenuItem AddColorButton = (MenuItem)findViewById(R.id.menu_insert);
boolean onOptionsItemSelected(AddColorButton) {
Intent intent = new Intent(SimpleFlashLightActivity.this,
BlueFlashLightActivity.class);
startActivity(intent);
return true;
;
};
/****************************************************************************************/
}
private void showColorChangeMsg()
{
Toast msgtoast = Toast.makeText(this.getBaseContext(), "SWITCH COLOR!",
Toast.LENGTH_LONG);
msgtoast.show();
}
private void showMsg(String msg) {
Toast toast = Toast.makeText(this, msg, Toast.LENGTH_LONG);
toast.show();
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.list_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case OK_MENU_ITEM:
showMsg("OK");
break;
}
return super.onOptionsItemSelected(item);
}
}
I want to create an intent that starts a new activity once a Menu Item is clicked, but I'm not sure how to do this. I've been reading through the android documentation, but my implementation isn't correct..and some guidance in the right direction would help. I've listed my code below and commented out my problem areas, I think I'm invoking the wrong method.
package com.jbsoft.SimpleFlashlight;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.*;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.Button;
import android.widget.Toast;
public class SimpleFlashLightActivity extends Activity {
Button GreenButton; // Declare instances of buttons to use later
Button BlueButton;
private static final int OK_MENU_ITEM = Menu.FIRST;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BlueButton = (Button) findViewById(R.id.bluebutton);
BlueButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Display msg when user clicks Blue Button
showColorChangeMsg();
// Switch Activities on click
Intent blueintent = new Intent(SimpleFlashLightActivity.this,
BlueFlashLightActivity.class);
startActivity(blueintent);
}
});
//Install listener for second button
GreenButton = (Button) findViewById(R.id.greenbutton);
GreenButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Display msg when user clicks Green Button
showColorChangeMsg();
Intent greenintent = new Intent(SimpleFlashLightActivity.this,
GreenFlashLightActivty.class);
startActivity(greenintent);
}
});
;
/**************************************************************************************/
// Method Declarations // THIS IS WHERE I'M HAVING A PROBLEM
MenuItem AddColorButton = (MenuItem)findViewById(R.id.menu_insert);
boolean onOptionsItemSelected(AddColorButton) {
Intent intent = new Intent(SimpleFlashLightActivity.this,
BlueFlashLightActivity.class);
startActivity(intent);
return true;
;
};
/****************************************************************************************/
}
private void showColorChangeMsg()
{
Toast msgtoast = Toast.makeText(this.getBaseContext(), "SWITCH COLOR!",
Toast.LENGTH_LONG);
msgtoast.show();
}
private void showMsg(String msg) {
Toast toast = Toast.makeText(this, msg, Toast.LENGTH_LONG);
toast.show();
}
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.list_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case OK_MENU_ITEM:
showMsg("OK");
break;
}
return super.onOptionsItemSelected(item);
}
}
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添加以下代码
Add Following Code
菜单项文件看起来像
res/menu/menu_main.xml
Java 代码看起来像
src/MainActivity.java
并将以下代码添加到您的 AndroidManifest.xml 文件中
我希望它会对您有所帮助。
Menu items file looks like
res/menu/menu_main.xml
Java code looks like
src/MainActivity.java
And add following code to your AndroidManifest.xml file
I hope it will help you.
除了问题中显示的选项之外,还可以从菜单直接在 xml 文件中实现操作,例如:
对于 Java(活动)文件,您需要使用单个参数实现公共方法MenuItem 类型,例如:
注意:此方法的行为类似于 onOptionsItemSelected (MenuItem item)
in addition to the options shown in your question, there is the possibility of implementing the action directly in your xml file from the menu, for example:
And for your Java (Activity) file, you need to implement a public method with a single parameter of type MenuItem, for example:
NOTE: This method will have behavior similar to the onOptionsItemSelected (MenuItem item)
这段代码对我有用
This code is work for me
中的样子
这就是 Kotlin main.xml
然后在 MainActivity 中
这是 onOptionsItemSelected 函数
用于启动新活动
This is how it looks like in Kotlin
main.xml
Then in MainActivity
This is onOptionsItemSelected function
For starting new activity
将您的
onOptionsItemSelected
替换为:在这里,我想从
DashboardActivity
导航到SettingActivity
。Replace Your
onOptionsItemSelected
as:Here, I want to navigate from
DashboardActivity
toSettingActivity
.