在 Android 应用程序中使用 Intent 显示另一个活动
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Using Intent in an Android application to show another activity
提问by Tai Squared
In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:
在我的 Android 应用程序中，我有两个活动类。我在第一个按钮上有一个按钮，我想在单击它时显示第二个按钮，但出现错误。以下是课程：
public class FirstActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button orderButton = (Button)findViewById(R.id.order);
orderButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(FirstActivity.this, OrderScreen.class);
startActivity(intent);
}
});
}
}
The second class that should show when the button is clicked, but never does:
单击按钮时应显示的第二个类，但从不显示：
public class OrderScreen extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order);
Button orderButton = (Button) findViewById(R.id.end);
orderButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
finish();
}
});
}
}
How do I create a button that will show the second activity?
如何创建将显示第二个活动的按钮？
采纳答案by Tai Squared
The issue was the OrderScreenActivitywasn't added to the AndroidManifest.xml. Once I added that as an application node, it worked properly.
问题是OrderScreenActivity没有添加到AndroidManifest.xml 中。一旦我将其添加为应用程序节点，它就可以正常工作。
<activity android:name=".OrderScreen" />
回答by user106011
Add this line to your AndroidManifest.xml:
将此行添加到您的 AndroidManifest.xml 中：
<activity android:name=".OrderScreen" />
回答by Sunil Chavan
----FirstActivity.java-----
---- FirstActivity.java-----
package com.mindscripts.eid;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class FirstActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button orderButton = (Button) findViewById(R.id.order);
orderButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(FirstActivity.this,OrderScreen.class);
startActivity(intent);
}
});
}
}
---OrderScreen.java---
--- OrderScreen.java---
package com.mindscripts.eid;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class OrderScreen extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second_class);
Button orderButton = (Button) findViewById(R.id.end);
orderButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}
---AndroidManifest.xml----
--- AndroidManifest.xml----
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mindscripts.eid"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".FirstActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".OrderScreen"></activity>
</application>
回答by Mahesh
Use this code:
使用此代码：
Intent intent=new Intent(context,SecondActivty.class);
startActivity(intent);
finish();
context: refer to current activity context,
上下文：指当前的活动上下文，
please make sure that you have added activity in android manifest file.
请确保您已在 android 清单文件中添加了活动。
Following code for adding activity in android manifest file
以下代码用于在 android 清单文件中添加活动
<Activity name=".SecondActivity">
</Activity>
回答by java dev
<activity android:name="[packagename optional].ActivityClassName"></activity>
Simply adding the activity which we want to switch to should be placed in the manifest file
简单地添加我们想要切换到的活动应该放在清单文件中
回答by Hiren Patel
b1 = (Button) findViewById(R.id.click_me);
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(MainActivity.this, SecondActivity.class);
startActivity(i);
}
});
回答by Android-iPhone-rahul
When you create any activity in android file you have to specify it in AndroidManifest.xml like
当您在 android 文件中创建任何活动时，您必须在 AndroidManifest.xml 中指定它，例如
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".MyCreativityActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".OrderScreen"></activity>
</application>
回答by Neal Ahluvalia
add the activity in your manifest file
在清单文件中添加活动
<activity android:name=".OrderScreen" />
回答by Nilesh Panchal
In the Manifest
在清单中
<activity android:name=".OrderScreen" />
In the Java Code where you have to place intent code
在必须放置意图代码的 Java 代码中
startActivity(new Intent(CurrentActivity.this, OrderScreen.class);
回答by Ndupza
Intent i = new Intent("com.Android.SubActivity");
startActivity(i);
