如何从Android中的一个活动启动活动 [英] How to launch activities from one activity in Android
问题描述
您好
我是Android开发的新手，我一直试图从另一个开展活动。让我们从主要活动说，我点击按钮启动家庭活动。然后从家庭活动，我希望能够根据点击的任何按钮启动5个不同的活动。我在网上尝试了很多资源，似乎没有一个对我有用。
从Main到Home它工作正常但从Home到其他活动，没有任何事情发生。
请协助。
PS。以下是我的示例代码：
MainActivity.java
包com.example.unisalabapp;
import android.os.Bundle;
import android.app.Activity;
导入android.content.Intent;
导入android.view.View;
导入android.view.View.OnClickListener;
import android.widget.Button;
公共类MainActivity扩展Activity实现OnClickListener {
Button btnLogin;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate （savedInstanceState）;
setContentView（R.layout.activity_main）;
btnLogin =（Button）findViewById（R.id.btnLogin） ;
bnnLogin.setOnClickListener（this）;
}
@Override
public void onClick（查看v）{
意图l =新意图（getApplicationContext（），Home.class）;
startActivity（l）;
}
}
HomeLauncher.java
包com.example.unisalabapp;
import android.os.Bundle;
导入android.view.View;
导入android.view.View.OnClickListener;
导入android.widget.Button;
import android.app.Activity;
import android.content.Intent;
public class HomeLauncher extends Activity实现OnClickListener {
按钮btnBooking;
@Override
protected void onCreate（Bundle） savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.home）;
//设置按钮监听器
btnB ooking =（Button）findViewById（R.id.btnBooking）;
bnnBooking.setOnClickListener（this）;
}
@Override
public void onClick（View v）{
意图b =新意图（getApplicationContext（），ComputerBooking.class）;
startActivity（b）;
}
}
其他五项活动之一： < br $>
包com.example.unisalabapp;
import android.app.Activity;
导入android.os.Bundle;
导入android.view.View;
导入android.widget.Button;
公共类ComputerBooking扩展活动{
@Override
protected void onCreate（Bundle savedInstanceState）{
// TODO自动生成方法存根
super.onCreate（savedInstanceState）;
setContentView（R.layout.computer_booking）;
//设置按钮监听器
按钮startButton =（按钮）findViewById（R.id.btnBack）;
startButton.setOnClickListener（new View.OnClickListener（） {
public void onClick（查看视图）{
完成（）;
}
}）; < br $>
}
}
清单：
< manifest xmlns：android =http://schemas.android.com/ apk / res / android>
package =com.example.unisalabapp
android：versionCode =1
android： versionName =1.0>
< uses-sdk>
android：minSdkVersion =8
android：targetSdkVersion =17/>
< application>
android：allowBackup =true
android：icon =@ drawable / ic_launcher
android：label =@ s tring / app_name
android：theme =@ style / AppTheme>
< activity>
android：name =com.example.unisalabapp.MainActivity
android：launchMode =singleTop
android：stateNotNeeded =true
android：label =@ string / app_name>
< intent-filter>
< action android：name =android.intent.action 。主要>
< category android：name =android.intent.category.LAUNCHER>
< activity>
android：name =com.example.unisalabapp.HomeLauncher
android：launchMode =singleTop
android： stateNotNeeded =true
android：label =@ string / app_name>
< intent-filter>
< action android：name =com.example.unisalabapp.HOME>
< action android：name =android.intent.category.DEFAULT>
< ;类别android：name =android.intent.category.LAUNCHER>
< ;活动>
android：name =com.example.unisalabapp.computer_booking
android：label =@ string / app_name>
< intent-filter>
< action android：name =android.intent.action.COMPUTER_BOOKING>
<！ - < action机器人：名称= com.example.unisalabapp.COMPUTER_BOOKING > - >
< action android：name =android.intent.category.DEFAULT>
在家庭活动中，onclick事件处理程序由多个按钮共享，你必须识别触发它的按钮才能启动正确的活动。看看这个： http://www.tutorialsbuzz.com/2014/ 02 / android-group-onclick-listener-multiple-button.html [ ^ ]
另一种方法是将独特的事件处理程序附加到xml布局上每个按钮的onclick属性上家庭活动，请查看： Android UI布局和控件 [< a href =http://www.codeproject.com/Articles/807524/Android-UI-Layouts-and-Controls#buttontarget =_ blanktitle =New Window> ^ ]
Hi there
I am new in Android development and I have been trying to launch activities from another. Let say from "Main Activity" I launch the "Home Activity" by clicking a button. Then from "Home Activity", I want to be able to launch 5 different activities based on whichever button is clicked. I have tried many resource online and none seems to work for me.
From Main to Home it is working fine but from Home to the other activities, nothing is happening.
Please assist.
PS. Below is my sample code:
MainActivity.java
package com.example.unisalabapp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
Button btnLogin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnLogin = (Button) findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent l = new Intent(getApplicationContext(), Home.class);
startActivity(l);
}
}
HomeLauncher.java
package com.example.unisalabapp;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.Intent;
public class HomeLauncher extends Activity implements OnClickListener {
Button btnBooking;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
//setup button listener
btnBooking = (Button) findViewById(R.id.btnBooking) ;
btnBooking.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Intent b = new Intent(getApplicationContext(), ComputerBooking.class);
startActivity(b);
}
}
one of the five other activities:
package com.example.unisalabapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class ComputerBooking extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.computer_booking);
//setup button listener
Button startButton = (Button) findViewById(R.id.btnBack);
startButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
finish();
}
});
}
}
The Manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
package="com.example.unisalabapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk>
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application>
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity>
android:name="com.example.unisalabapp.MainActivity"
android:launchMode="singleTop"
android:stateNotNeeded="true"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN">
<category android:name="android.intent.category.LAUNCHER">
<activity>
android:name="com.example.unisalabapp.HomeLauncher"
android:launchMode="singleTop"
android:stateNotNeeded="true"
android:label="@string/app_name">
<intent-filter>
<action android:name="com.example.unisalabapp.HOME">
<action android:name="android.intent.category.DEFAULT">
<category android:name="android.intent.category.LAUNCHER">
<activity>
android:name="com.example.unisalabapp.computer_booking"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.COMPUTER_BOOKING">
<!-- <action android:name="com.example.unisalabapp.COMPUTER_BOOKING"> -->
<action android:name="android.intent.category.DEFAULT">
On the home activity, the onclick event handler is being shared by multiple buttons, you will have to identify the button that trigger it in order to launch the correct activity. Check this out: http://www.tutorialsbuzz.com/2014/02/android-group-onclick-listener-multiple-button.html[^]
Another way is to attach a distinct event handler to the onclick attribute of each button on the xml layout of home activity, check this out: Android UI Layouts and Controls[^]
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