Android的电源适配器没有更新的用户界面 [英] Android adapter not updating ui

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问题描述

我有一类女巫拥有一些变量...例如

  INT黄色= 0xffffff66;
 INT绿色= 0xff00EE76;
 INT红色= 0xffff4342;
 INT蓝色= 0xff42c3ff;
 INT紫色= 0xff9932CC;
 INT白色= 0xffffffff的;
 ArrayList的＆LT;整数GT; nextColorArray =新的ArrayList＆LT;整数GT;（）;

INT TOTAL_COUNT = 0;

在我的onCreate方法：

 的GridView gridview2 =（GridView控件）findViewById（R.id.colorNext）;
gridview2.setAdapter（新ImageAdapter（本））;
nextColorArray.add（蓝色）;
nextColorArray.add（绿色）;
nextColorArray.add（红色）;
nextColorArray.add（黄色）;
nextColorArray.add（紫色）;

这是我的适配器我添加元素到网格视图产生5种颜色显示在GridView UI没有问题... ... OK

我有一个按钮的onclick（不在的onCreate）事件，到1，每次递增TOTAL_COUNT我按一下按钮... OK时TOTAL_COUNT大于十，我想一个新的元素添加到array..ok 

 如果（动作== MotionEvent.ACTION_DOWN）{
   如果（TOTAL_COUNT→10）{
       nextColorArray.add（0，白色）;
}...好

我的问题是，用户界面​​的GridView没有更新的用户界面，以显示新的颜色...我如何能当一个新的颜色添加到列表?​​???

更新适配器的任何想法

编辑：因为我不知道我对我的帖子有多少编辑的制作。我编辑的问题，这里增加了答案。这个工程。 

 公共类MainActivity延伸活动{
INT黄色= 0xffffff66;
INT绿色= 0xff00EE76;
INT红色= 0xffff4342;
INT蓝色= 0xff42c3ff;
INT紫色= 0xff9932CC;
INT白色= 0xFFFFFFFF的;

INT TOTAL_COUNT = 0;
INT colorPosition = 0;
INT colorPickerStart = 0;
Button按钮;

ImageView的ImageView的;

ImageAdapter IA;
GridView控件gridview2;

的ArrayList＆其中;整数＆GT; nextColorArray =新的ArrayList＆其中;整数＆GT;（10）;
ArrayList的＆LT;整数GT;颜色拾取=新的ArrayList＆LT;整数GT;（）;

@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）;
nextColorArray.add（蓝色）;
nextColorArray.add（绿色）;
nextColorArray.add（红色）;
nextColorArray.add（黄色）;
nextColorArray.add（紫色）;
//设置适配器
GridView控件的GridView =（GridView控件）findViewById（R.id.gridview）;
gridview.setAdapter（新ButtonAdapter（本））;
按钮=（按钮）findViewById（R.id.button1）;
gridview2 =（GridView控件）findViewById（R.id.gridview2）;
IA =新ImageAdapter（这一点，nextColorArray）;
gridview2.setAdapter（IA）;
button.setOnClickListener（新Button.OnClickListener（）{
            @覆盖
            公共无效的onClick（查看为arg0）{

                        nextColorArray.add（Color.BLACK）;
                        ia.notifyDataSetChanged（）;

            }
        }）;
//接下来的色彩元素


}
公共类ImageAdapter扩展了BaseAdapter {
私人语境mContext;
ArrayList的＆LT;整数GT;一个;

公共ImageAdapter（上下文C，的ArrayList＆其中;整数＆gt;一种）{
    mContext = C;
    this.a =一个;
}
公众诠释getCount将（）{

    返回a.size（）;
}

公共对象的getItem（INT位置）{
    返回的位置;
}

众长getItemId（INT位置）{
    返回0;
}

/ *创建一个新的ImageView由适配器引用的每个项目* /
公共查看getView（INT位置，查看convertView，ViewGroup中父）{
    如果（convertView == NULL）{/ *如果它不回收，初始化一些属性* /
        ImageView的=新ImageView的（mContext）;
        imageView.setLayoutParams（新GridView.LayoutParams（50，45））;
        imageView.setBackgroundColor（nextColorArray.get（colorPosition））;
        如果（colorPosition＆LT; 9）colorPosition ++;
    } 其他 {
        ImageView的=（ImageView的）convertView;
    }
    返回ImageView的;
}

}
/ *按钮适配器* /
公共类ButtonAdapter扩展了BaseAdapter {
私人语境mContext;

公共ButtonAdapter（上下文C）{
    mContext = C;
}

公众诠释getCount将（）{

    返回nextColorArray .size（）;
}

公共对象的getItem（INT位置）{
    返回的位置;
}

众长getItemId（INT位置）{
    返回0;
}

//由适配器引用的每个项目创建一个新的按钮
公共查看getView（INT位置，查看convertView，ViewGroup中父）{

    如果（convertView == NULL）{

        按钮=新按钮（mContext）;
        button.setLayoutParams（新GridView.LayoutParams（128，128））;

        TOTAL_COUNT ++;
        button.setText（+ TOTAL_COUNT）;
    } 其他 {
        按钮=（按钮）convertView;
    }
    返回按钮;
} //到底得的观点
} //结束按钮适配器

activity_main 

 ＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
的xmlns：工具=htt​​p://schemas.android.com/tool​​s
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：paddingBottom会=@扪/ activity_vertical_margin
机器人：以下属性来=@扪/ activity_horizo​​ntal_margin
机器人：paddingRight =@扪/ activity_horizo​​ntal_margin
机器人：paddingTop =@扪/ activity_vertical_margin
工具：上下文=MainActivity。＆GT;

＆LT; GridView控件
    机器人：ID =@ + ID / GridView控件
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =150dp
    机器人：columnWidth中=0dp
    机器人：重力=中心
    机器人：为numColumns =2
    机器人：horizo​​ntalSpacing =20dp
    机器人：填充=40dp
    机器人：verticalSpacing =20dp/＆GT;
     ＆LT; GridView控件
    机器人：ID =@ + ID / gridview2
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =150dp
    机器人：layout_above =@ + ID /按钮1
    机器人：layout_alignParentRight =真
    机器人：layout_marginBottom =74dp
    机器人：columnWidth中=0dp
    机器人：重力=中心
    机器人：horizo​​ntalSpacing =20dp
    机器人：为numColumns =2
    机器人：填充=40dp
    机器人：verticalSpacing =20dp＆GT;
＆LT; / GridView的＆GT;


＆LT;按钮
    机器人：ID =@ + ID /按钮1
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_alignParentBottom =真
    机器人：layout_centerHorizo​​ntal =真
    机器人：文本=按钮/＆GT;


＆LT; / RelativeLayout的＆GT;

解决方案

  ImageAdapter IA;
 GridView控件gridview2 =（GridView控件）findViewById（R.id.colorNext）;
 IA =新ImageAdapter（本）;
 gridview2.setAdapter（IA）;
 ....
 如果（动作== MotionEvent.ACTION_DOWN）{
 如果（TOTAL_COUNT→10）{
   nextColorArray.add（0，白色）;
   ia.notifyDataSetChanged（）; //调用notifyDataSetChanged来更新你的GridView
 }

公共无效notifyDataSetChanged（）

通知所附的观察员的基础数据已被更改，任何视图反映了数据集应自动刷新。

例如：

activity_main.xml 

 ＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
的xmlns：工具=htt​​p://schemas.android.com/tool​​s
机器人：layout_width =match_parent
机器人：layout_height =match_parent
机器人：paddingBottom会=@扪/ activity_vertical_margin
机器人：以下属性来=@扪/ activity_horizo​​ntal_margin
机器人：paddingRight =@扪/ activity_horizo​​ntal_margin
机器人：paddingTop =@扪/ activity_vertical_margin
工具：上下文=MainActivity。＆GT;

＆LT; GridView控件
    机器人：ID =@ + ID / GridView控件
    机器人：layout_width =FILL_PARENT
    机器人：layout_height =WRAP_CONTENT
    机器人：columnWidth中=0dp
    机器人：重力=中心
    机器人：为numColumns =2
    机器人：horizo​​ntalSpacing =20dp
    机器人：填充=40dp
    机器人：verticalSpacing =20dp/＆GT;

＆LT;按钮
    机器人：ID =@ + ID /按钮1
    机器人：layout_width =WRAP_CONTENT
    机器人：layout_height =WRAP_CONTENT
    机器人：layout_alignParentBottom =真
    机器人：layout_centerHorizo​​ntal =真
    机器人：文本=按钮/＆GT;

    ＆LT; / RelativeLayout的＆GT;

MainActivity 

 公共类MainActivity延伸活动{

ImageAdapter IM;
ImageView的ImageView的;
GridView的GD;
 ArrayList的＆LT;整数GT; nextColorArray =新的ArrayList＆LT;整数GT;（）;
@覆盖
保护无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.activity_main）;

     INT黄色= 0xffffff66;
     INT绿色= 0xff00EE76;
     INT红色= 0xffff4342;
     INT蓝色= 0xff42c3ff;
     INT紫色= 0xff9932CC;
     最终诠释白色= 0xffffffff的;
     nextColorArray.add（蓝色）;
     nextColorArray.add（绿色）;
     nextColorArray.add（红色）;
     nextColorArray.add（黄色）;
     nextColorArray.add（紫色）;
        GD =（GridView控件）findViewById（R.id.gridview）;
        IM =新ImageAdapter（这一点，nextColorArray）;
        gd.setAdapter（IM）;
     按钮B =（按钮）findViewById（R.id.button1）;
     b.setOnClickListener（新OnClickListener（）
     {

        @覆盖
        公共无效的onClick（视图v）{
            // TODO自动生成方法存根
            nextColorArray.add（Color.BLACK）;
            im.notifyDataSetChanged（）;

        }

     }）;
}
}

ImageAdapter 

 公共类ImageAdapter扩展了BaseAdapter {

语境mContext;
ArrayList的＆LT;整数GT;一个;

公共ImageAdapter（语境上下文，的ArrayList＆其中;整数＆gt;一种）{
    mContext =背景;
    this.a =一个;
}

@覆盖
公众诠释getCount将（）{
    // TODO自动生成方法存根
    返回a.size（）;
}

@覆盖
公共对象的getItem（INT位置）{
    // TODO自动生成方法存根
    返回的位置;
}

@覆盖
众长getItemId（INT位置）{
    // TODO自动生成方法存根
    返回的位置;
}

@覆盖
公共查看getView（最终诠释的立场，观点ARG1，ARG2的ViewGroup）{
     ImageView的ImageView的;
        如果（ARG1 == NULL）{
            ImageView的=新ImageView的（mContext）;

            imageView.setPadding（0，20，0，0）;
        } 其他 {
            ImageView的=（ImageView的）ARG1;
        }

        imageView.setBackgroundColor（a.get（位置））;

        返回ImageView的;

}
 }

，当你点击黑色出现在屏幕上。

快照

I have a class witch holds some variables...eg

 int yellow = 0xffffff66;
 int green = 0xff00EE76;
 int red = 0xffff4342;
 int blue = 0xff42c3ff;
 int purple = 0xff9932CC;
 int white = 0xffffffff;
 ArrayList<Integer>nextColorArray = new ArrayList<Integer>();

int total_count = 0;

in my onCreate method:

GridView gridview2 = (GridView) findViewById(R.id.colorNext);
gridview2.setAdapter(new ImageAdapter(this));
nextColorArray.add(blue);
nextColorArray.add(green);
nextColorArray.add(red);
nextColorArray.add(yellow);
nextColorArray.add(purple);

from my adapter i add elements to the grid view to produce 5 colors the show in the gridview UI no problem... o.k

i have a button onclick(not in onCreate) event that increments total_count by 1 each time i click the button...o.k when the total_count is greater than ten i want to add a new element to the array..ok

if (action == MotionEvent.ACTION_DOWN) {
   if(total_Count > 10){
       nextColorArray.add(0, white);  
}...ok

my problem is that the UI gridview is not updating the ui to show the new color...any ideas on how i can update the adapter when a new color is added to the list????

Edit: Since i am not sure how many edit's i made to my post. i edited the question and added the answer here. This works . 

public class MainActivity extends Activity {
int yellow = 0xffffff66;
int green = 0xff00EE76;
int red = 0xffff4342;
int blue = 0xff42c3ff;
int purple = 0xff9932CC;
int white = 0xFFFFFFFF;

int total_Count = 0;
int colorPosition = 0;
int colorPickerStart = 0;
Button button;

ImageView imageView;

ImageAdapter ia;
GridView gridview2;

ArrayList<Integer>nextColorArray = new ArrayList<Integer>(10);
ArrayList<Integer>colorPicker = new ArrayList<Integer>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nextColorArray.add(blue);
nextColorArray.add(green);
nextColorArray.add(red);
nextColorArray.add(yellow);
nextColorArray.add(purple);
//set adapters
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ButtonAdapter(this));
button = (Button) findViewById(R.id.button1); 
gridview2 = (GridView) findViewById(R.id.gridview2);
ia = new ImageAdapter(this, nextColorArray);
gridview2.setAdapter(ia);
button.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View arg0) {

                        nextColorArray.add(Color.BLACK);
                        ia.notifyDataSetChanged();

            }
        });
//next color elements


}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
ArrayList<Integer> a;

public ImageAdapter(Context c, ArrayList<Integer> a) {
    mContext = c;
    this.a = a;
}
public int getCount() {

    return a.size();
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return 0;
}

/*create a new ImageView for each item referenced by the Adapter*/
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null) {/*if it's not recycled, initialize some attributes*/
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(50, 45));
        imageView.setBackgroundColor(nextColorArray.get(colorPosition));
        if(colorPosition < 9) colorPosition++;
    } else {
        imageView = (ImageView) convertView;
    }
    return imageView;
}

}
/*button adapter*/
public class ButtonAdapter extends BaseAdapter {
private Context mContext;

public ButtonAdapter(Context c) {
    mContext = c;
}

public int getCount() {

    return nextColorArray .size();
}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return 0;
}

// create a new button for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {

        button = new Button(mContext);
        button.setLayoutParams(new GridView.LayoutParams(128, 128));

        total_Count++;
        button.setText(""+total_Count); 
    } else {
        button = (Button) convertView;
    }
    return button;
}// end get view
}// end button adapter

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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<GridView
    android:id="@+id/gridview"
    android:layout_width="fill_parent"
    android:layout_height="150dp"
    android:columnWidth="0dp"
    android:gravity="center"
    android:numColumns="2"
    android:horizontalSpacing="20dp"
    android:padding="40dp"
    android:verticalSpacing="20dp" />
     <GridView
    android:id="@+id/gridview2"
    android:layout_width="fill_parent"
    android:layout_height="150dp"
    android:layout_above="@+id/button1"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="74dp"
    android:columnWidth="0dp"
    android:gravity="center"
    android:horizontalSpacing="20dp"
    android:numColumns="2"
    android:padding="40dp"
    android:verticalSpacing="20dp" >
</GridView>


<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:text="Button" />


</RelativeLayout>

解决方案 

 ImageAdapter ia;
 GridView gridview2 = (GridView) findViewById(R.id.colorNext);
 ia = new ImageAdapter(this);
 gridview2.setAdapter(ia);  
 .... 
 if (action == MotionEvent.ACTION_DOWN) {
 if(total_Count > 10){
   nextColorArray.add(0, white); 
   ia.notifyDataSetChanged(); // call notifyDataSetChanged  to update your gridview
 }

public void notifyDataSetChanged ()

Notifies the attached observers that the underlying data has been changed and any View reflecting the data set should refresh itself.

Example:

activity_main.xml

<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<GridView
    android:id="@+id/gridview"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:columnWidth="0dp"
    android:gravity="center"
    android:numColumns="2"
    android:horizontalSpacing="20dp"
    android:padding="40dp"
    android:verticalSpacing="20dp" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:text="Button" />

    </RelativeLayout>

MainActivity

  public class MainActivity extends Activity {

ImageAdapter im;
ImageView imageView;
GridView gd;
 ArrayList<Integer>nextColorArray = new ArrayList<Integer>(); 
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

     int yellow = 0xffffff66;
     int green = 0xff00EE76;
     int red = 0xffff4342;
     int blue = 0xff42c3ff;
     int purple = 0xff9932CC;
     final int white = 0xffffffff;
     nextColorArray.add(blue);
     nextColorArray.add(green);
     nextColorArray.add(red);
     nextColorArray.add(yellow);
     nextColorArray.add(purple);
        gd= (GridView) findViewById(R.id.gridview);
        im = new ImageAdapter(this,nextColorArray);
        gd.setAdapter(im);
     Button b= (Button) findViewById(R.id.button1);
     b.setOnClickListener(new OnClickListener()
     {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            nextColorArray.add(Color.BLACK);
            im.notifyDataSetChanged();

        }

     });
}
}

ImageAdapter

   public class ImageAdapter extends BaseAdapter{

Context mContext;
ArrayList<Integer> a;

public ImageAdapter(Context context,ArrayList<Integer> a)   {
    mContext=context;
    this.a= a;
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return a.size();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(final int position, View arg1, ViewGroup arg2) {
     ImageView imageView;
        if (arg1 == null) {  
            imageView = new ImageView(mContext);

            imageView.setPadding(0, 20, 0, 0);
        } else {
            imageView = (ImageView) arg1;
        }

        imageView.setBackgroundColor(a.get(position));

        return imageView;

}
 }

As and when you click black color appears on the screen.

SnapShot

这篇关于Android的电源适配器没有更新的用户界面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！

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