随机XML布局文件的活动 [英] Random xml layouts files for an Activity
问题描述
我有五个布局(XML文件),每一个都带有一个按钮
它和两个活动,急症室; B.在开始按钮的的onClick
在一个动作,我会打开活动B和所有的故事开始出现:
在我的活动B,首先,我想说明这五个XML文件的一个按钮的和
在全部五个XML文件,我想随意打开剩下的4 XML文件,直到返回按钮pssed $ P $。。有没有什么办法,我可以做到这一点,或我必须在每个5的活动有一个布局?的onclick
我的问题是:
只是一个XML文件中随机出现的活动B和按钮
上的XML文件上没有响应,即不显示下一个XML文件。
下面是code我的活动B:
公共类B扩展活动{
处理程序处理程序=新的处理程序();
按钮胜;
INT []布局= {R.layout.first,R.layout.second,R.layout.third,R.layout.fourth,R.layout.fifth};
@覆盖
保护无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
BT =(按钮)findViewById(R.id.button1);
bt.setOnClickListener(新OnClickListener(){
@覆盖
公共无效的onClick(查看为arg0){
// TODO自动生成方法存根
handler.postDelayed(新的Runnable(){
@覆盖
公共无效的run(){
// TODO自动生成方法存根
的for(int i = 0; I< layouts.length;我++){
的setContentView(布局[兰特]);
}
}
},2000);
}
});
}
和所有的5 XML文件将走在相同的模式:
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
的xmlns:工具=http://schemas.android.com/tools
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直
工具:上下文=MainActivity。>
<的TextView
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:重力=中心
机器人:文本=@字符串/参考hello world/>
<按钮
机器人:ID =@ + ID / button5
机器人:layout_width =match_parent
机器人:layout_height =WRAP_CONTENT
机器人:layout_gravity =中心
机器人:layout_marginTop =10dp
机器人:的onClick =showLayouts
机器人:文本=5/>
我是新来的Java,所以Stucked这里,如果有任何简单的线索,也将帮助我,我搜索这个论坛,发现没有相关的解决方案。
@LuksProg,logcat的错误是这样的:
** 5月3日至11号:51:16.147:E / AndroidRuntime(1575):致命异常:主要
五月三日至11日:51:16.147:E / AndroidRuntime(1575):java.lang.RuntimeException的:无法启动的活动ComponentInfo {com.SAI.wth / com.SAI.wth.ReceivingActivity}:显示java.lang.NullPointerException
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread.access $ 600(ActivityThread.java:141)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1234)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.os.Handler.dispatchMessage(Handler.java:99)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.os.Looper.loop(Looper.java:137)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread.main(ActivityThread.java:5039)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在java.lang.reflect.Method.invokeNative(本机方法)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在java.lang.reflect.Method.invoke(Method.java:511)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:793)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在dalvik.system.NativeStart.main(本机方法)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):由:显示java.lang.NullPointerException
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在com.SAI.wth.ReceivingActivity.onCreate(ReceivingActivity.java:40)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.Activity.performCreate(Activity.java:5104)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
五月三日至11日:51:16.147:E / AndroidRuntime(1575):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)**
这一次,我想这样做,
开关(mPosition){
案例R.layout.first:
Toast.makeText(getApplicationContext(),第一,Toast.LENGTH_SHORT).show();
打破;
案例R.layout.second:
Toast.makeText(getApplicationContext(),第二,Toast.LENGTH_SHORT).show();
//一些声音
打破;
案例R.layout.third:
Toast.makeText(getApplicationContext(),第三,Toast.LENGTH_SHORT).show();
//一些媒体,不同的为每个布局..
打破;
案例R.layout.fourth:
Toast.makeText(getApplicationContext(),第四,Toast.LENGTH_SHORT).show();
打破;
案例R.layout.fifth:
Toast.makeText(getApplicationContext(),十五,Toast.LENGTH_SHORT).show();
打破;
默认:
打破;
}
Collections.shuffle(mLayouts);
}
mPosition = 0;
}
只是一个XML文件中是一个出现在随机的活动B和;上的按钮 该XML文件没有响应,即不显示下一个XML文件中。
您会想是这样的:
私人INT mPosition = 0;
私人处理程序mHandler =新的处理程序();
私人列表<整数GT; mLayouts;
私人按钮mButton;
私人OnClickListener mListener =新OnClickListener(){
@覆盖
公共无效的onClick(视图v){
mHandler.postDelayed(新的Runnable(){
@覆盖
公共无效的run(){
//为您发布此延迟可能要确保
//用户没有再次点击此布顿在两秒的时间间隔
如果(mPosition> = mLayouts.size()){//恢复列表
INT lastId = mLayouts.get(mLayouts.size() - 1);
Collections.shuffle(mLayouts);
//做到这一点,所以如果我们随机化布局,我们不结束
与在相同的布局洗牌后//起来
// 第一
//位置的最后位置
而(lastId == mLayouts.get(0)){
Collections.shuffle(mLayouts);
}
mPosition = 0;
}
的setContentView(mLayouts.get(mPosition));
mPosition ++;
mButton =(按钮)findViewById(R.id.btnId);
mButton.setOnClickListener(mListener);
}
},2000);
}
};
和的onCreate
方法:
mLayouts =新的ArrayList<整数GT;();
mLayouts.add(R.layout.layout1);
mLayouts.add(R.layout.layout2);
mLayouts.add(R.layout.layout3);
mLayouts.add(R.layout.layout4);
mLayouts.add(R.layout.layout5);
Collections.shuffle(mLayouts);
的setContentView(mLayouts.get(mPosition));
mButton =(按钮)findViewById(R.id.btnId);
mButton.setOnClickListener(mListener);
mPosition ++;
I have five layouts(XML files), each one with a Button
on it and two activities, A & B. In the onClick
action of start Button in A, I'll open the activity B and all the story begins there:
In my activity B, first, I want to show one of these five xml files and onclick
of the Button
IN each of the five XML files, I want to randomly open the remaining 4 xml files, until Back button is pressed.. Is there any way I could do this or I must have 5 activities each with one layout?
My problem is:
Just one Xml file is appearing randomly on activity B and the Button
on that xml file is not responding, i.e, not showing next xml file.
Here is the code for my activity B:
public class B extends Activity {
Handler handler = new Handler();
Button bt;
int[] layouts = {R.layout.first,R.layout.second,R.layout.third,R.layout.fourth,R.layout.fifth};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
bt = (Button)findViewById(R.id.button1);
bt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
for (int i = 0; i < layouts.length; i++) {
setContentView(layouts[rand]);
}
}
}, 2000);
}
});
}
And all the 5 Xml Files Will go in the same paTTERN:
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="@string/hello_world" />
<Button
android:id="@+id/button5"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp"
android:onClick="showLayouts"
android:text="5th" />
I am new to Java, So Stucked Here, If any simple clue also will help me.I have searched this forum And found no relevant solution.
@LuksProg, Logcat Error is Like this:
**03-11 05:51:16.147: E/AndroidRuntime(1575): FATAL EXCEPTION: main
03-11 05:51:16.147: E/AndroidRuntime(1575): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.SAI.wth/com.SAI.wth.ReceivingActivity}: java.lang.NullPointerException
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.os.Handler.dispatchMessage(Handler.java:99)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.os.Looper.loop(Looper.java:137)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread.main(ActivityThread.java:5039)
03-11 05:51:16.147: E/AndroidRuntime(1575): at java.lang.reflect.Method.invokeNative(Native Method)
03-11 05:51:16.147: E/AndroidRuntime(1575): at java.lang.reflect.Method.invoke(Method.java:511)
03-11 05:51:16.147: E/AndroidRuntime(1575): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-11 05:51:16.147: E/AndroidRuntime(1575): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-11 05:51:16.147: E/AndroidRuntime(1575): at dalvik.system.NativeStart.main(Native Method)
03-11 05:51:16.147: E/AndroidRuntime(1575): Caused by: java.lang.NullPointerException
03-11 05:51:16.147: E/AndroidRuntime(1575): at com.SAI.wth.ReceivingActivity.onCreate(ReceivingActivity.java:40)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.Activity.performCreate(Activity.java:5104)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-11 05:51:16.147: E/AndroidRuntime(1575): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)**
This time I want to do this,
switch (mPosition) {
case R.layout.first:
Toast.makeText(getApplicationContext(), "First", Toast.LENGTH_SHORT).show();
break;
case R.layout.second:
Toast.makeText(getApplicationContext(), "second", Toast.LENGTH_SHORT).show();
//Some sound
break;
case R.layout.third:
Toast.makeText(getApplicationContext(), "third", Toast.LENGTH_SHORT).show();
//Some media , Different for each Layout..
break;
case R.layout.fourth:
Toast.makeText(getApplicationContext(), "fourth", Toast.LENGTH_SHORT).show();
break;
case R.layout.fifth:
Toast.makeText(getApplicationContext(), "fifth", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
Collections.shuffle(mLayouts);
}
mPosition = 0;
}
just one Xml file is Appearing in random on Activity B & the button on that xml file is not responding, i.e, not showing next xml file.
You'll want something like this:
private int mPosition = 0;
private Handler mHandler = new Handler();
private List<Integer> mLayouts;
private Button mButton;
private OnClickListener mListener = new OnClickListener() {
@Override
public void onClick(View v) {
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
// as you're posting this delayed you may want to make sure the
// user doesn't click this Buton again in the two seconds interval
if (mPosition >= mLayouts.size()) { // revert the list
int lastId = mLayouts.get(mLayouts.size() - 1);
Collections.shuffle(mLayouts);
// do this so if we randomize the layouts we don't end
// up after the shuffle with the same layout on the
// first
// position as the last position
while (lastId == mLayouts.get(0)) {
Collections.shuffle(mLayouts);
}
mPosition = 0;
}
setContentView(mLayouts.get(mPosition));
mPosition++;
mButton = (Button) findViewById(R.id.btnId);
mButton.setOnClickListener(mListener);
}
}, 2000);
}
};
and in the onCreate
method:
mLayouts = new ArrayList<Integer>();
mLayouts.add(R.layout.layout1);
mLayouts.add(R.layout.layout2);
mLayouts.add(R.layout.layout3);
mLayouts.add(R.layout.layout4);
mLayouts.add(R.layout.layout5);
Collections.shuffle(mLayouts);
setContentView(mLayouts.get(mPosition));
mButton = (Button) findViewById(R.id.btnId);
mButton.setOnClickListener(mListener);
mPosition++;
这篇关于随机XML布局文件的活动的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!