我有一个班级女巫持有一些变量......例如
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 总计数 = 0;
在我的 onCreate 方法中：
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);
从我的适配器我将元素添加到网格视图以产生 5 种颜色在 gridview UI 中显示没问题...好的
我有一个按钮 onclick（不在 onCreate 中）事件，每次单击按钮时，总计数都会增加 1……好的，当总计数大于 10 时，我想向数组中添加一个新元素……好的
if (action == MotionEvent.ACTION_DOWN) {
if(total_Count > 10){
nextColorArray.add(0, white);
}...ok
我的问题是 UI gridview 没有更新 ui 以显示新颜色...关于在列表中添加新颜色时如何更新适配器的任何想法？？？？
编辑：因为我不确定我对我的帖子做了多少编辑。我编辑了问题并在此处添加了答案。这行得通。
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
活动主
<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>
