憋屈，为什么我的Android应用程序不会工作？ [英] Stuck on why my android app wont work?
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问题描述
好了，我工作的一个应用程序，这将做到以下几点：
Ok, so I am working on an app which will do the following:
- 允许用户第一山姆在EDITTEXT字段中键入他/她的消息。
- preSS在屏幕底部的亚历克斯按钮，开始新的活动ActivityAlex
- 允许用户亚历克斯编辑EDITTEXT领域。
- preSS在屏幕底部的萨姆按钮，重新启动该活动MainActivity
到目前为止，我觉得我有最所做的工作，但我被陷在如何解决程序，所以它会做我想做的事情。
So far, I think I have most of the work done but I'm getting stuck on how to fix the program so it will do what I want it to do.
下面是我的 logcat的
下面是我的MainActivity：
Here is my MainActivity:
package com.chatfriends;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
private Button alexButton; //initialize the buttons for "alex" and "sam"
public void initialize(){
alexButton = (Button) findViewById(R.id.button1); // initializing the buttons by location. Also need to define the button with two states (regular and yellow)
alexButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0){
alexbutton(arg0);
}
public void alexbutton(View v) {
Intent intent = new Intent(MainActivity.this, ActivityAlex.class); //the intent is telling the app what you want it to do. Think about setting the intent to the buttons.
startActivity(intent);
}
});
}
}
下面是我的ActivityAlex：
Here is my ActivityAlex:
package com.chatfriends;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ActivityAlex extends MainActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
private Button samButton; //initialize the buttons for "alex" and "sam"
public void initialize(){
samButton = (Button) findViewById(R.id.button2); // initializing the buttons by location. Also need to define the button with two states (regular and yellow)
samButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0){
samButton(arg0);
}
public void samButton(View v) {
Intent intent = new Intent(ActivityAlex.this, MainActivity.class); //the intent is telling the app what you want it to do. Think about setting the intent to the buttons.
startActivity(intent);
}
});
}
}
下面是我的清单code：
Here is my Manifest code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.chatfriends"
android:versionCode="1"
android:versionName="1.0" xmlns:tools="http://schemas.android.com/tools" tools:ignore="OldTargetApi">
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" tools:ignore="MissingPrefix"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
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=".ActivityAlex" />
</application>
</manifest>
下面是XML布局文件：
activity_main：
Here are the xml layout files: activity_main:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/userName1"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:ems="10"
android:inputType="textMultiLine" >
<requestFocus />
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="26dp"
android:layout_toRightOf="@+id/textView1"
android:text="@string/button1"
android:onClick="startalexbutton" />
</RelativeLayout>
activityalex.xml
activityalex.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ActivityAlex" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="@string/userName2"
android:textAppearance="?android:attr/textAppearanceLarge" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:ems="10"
android:inputType="textMultiLine" >
</EditText>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="26dp"
android:layout_marginRight="20dp"
android:layout_toRightOf="@+id/textView1"
android:text="@string/button2"
android:onClick="startMainActivity" />
</RelativeLayout>
在此先感谢！
推荐答案
你是不是叫初始化（）在的onCreate 的 ActivityAlex 和 MainActivity 活动初始化按钮
you are not calling initialize() in onCreate of ActivityAlex and MainActivity Activity to initialize Button
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initialize() ;//<<<<initialize here
}
和去除的onClick从XML两个按钮属性为
and remove onClick Attribute from both button in xml as
在activity_main.xml中：
In activity_main.xml :
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="26dp"
android:layout_toRightOf="@+id/textView1"
android:text="@string/button1"
/>
在activityalex.xml：
In activityalex.xml :
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="26dp"
android:layout_marginRight="20dp"
android:layout_toRightOf="@+id/textView1"
android:text="@string/button2"
/>
注意：
setOnClickListener 在Java code的任何视图，则不需要添加安卓的onClick 景观XML
when you are adding setOnClickListener for any View in java code then not need to add android:onClick with View xml
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