如何刷新GridView的？GridView
2023-09-12 07:30:16
作者：回頭已無路
我有一个GridView这类似于谷歌教程pretty的，但我想补充上运行时ImageViews（通过一个子活动）。结果是正常的，但鉴于布局搞砸：？GridView控件不填写其父的内容，做什么我必须做设计得当
下面加入了孩子们的code：
公共无效initializeWorkbench（GridView的GV，矢量＆lt;串GT;项目）{
Prototype.workbench.setDimension（屏幕宽度，divider.height（）+ workbenchArea.height（））;
Prototype.workbench.activateWorkbench（）;
//这个正确测量工作台
Log.d（Prototype.TAG，工作台宽：+ Prototype.workbench.getMeasuredWidth（））;
// 320
Log.d（Prototype.TAG，工作台高度：+ Prototype.workbench.getMeasuredHeight（））;
// 30
ImageAdapter imgAdapter =新ImageAdapter（this.getContext（），项目）;
gv.setAdapter（imgAdapter）;
gv.measure（屏幕宽度，screenHeight）;
gv.requestLayout（）;
gv.forceLayout（）;
Log.d（Prototype.TAG，GV宽：+ gv.getMeasuredWidth（））;
// 22
Log.d（Prototype.TAG，GV高度：+ gv.getMeasuredHeight（））;
// 119
Prototype.workbench.setDimension（屏幕宽度，divider.height（）+ workbenchArea.height（））;
}
}
activateWorkbench，setDimension并测量工作台（的LinearLayout上面的GridView控件）：
公共无效activateWorkbench（）{
如果（this.equals（Prototype.workbench））{
this.setOrientation（垂直）;
秀= TRUE;
测量（）;
}
}
公共无效setDimension（INT W，INT高）{
宽= W;
高度= H;
this.setLayoutParams（新LinearLayout.LayoutParams（宽度，高度））;
this.invalidate（）;
}
私人无效措施（）{
如果（this.getOrientation（）== LinearLayout.VERTICAL）{
INT H = 0;
INT瓦特= 0;
this.measureChildren（0，0）;
的for（int i = 0; I＆LT; this.getChildCount（）;我++）{
视图v = this.getChildAt（ⅰ）;
H + = v.getMeasuredHeight（）;
W =（W＆LT; v.getMeasuredWidth（））？ v.getMeasuredWidth（）：W;
}
如果（this.equals（Prototype.tagarea））
身高=（H＆LT;高）？高度：H;
如果（this.equals（Prototype.tagarea））
宽度=（W＆LT;宽）？宽度：W;
}
this.setMeasuredDimension（宽度，高度）;
}
在ImageAdapter构造：
公共ImageAdapter（上下文C，矢量＆lt;串GT;项目）{
mContext = C;
布尔mExternalStorageAvailable = FALSE;
布尔mExternalStorageWriteable = FALSE;
字符串状态= Environment.getExternalStorageState（）;
如果（Environment.MEDIA_MOUNTED.equals（州））{
//我们可以读取和写入的媒体
mExternalStorageAvailable = mExternalStorageWriteable = TRUE;
}否则，如果（Environment.MEDIA_MOUNTED_READ_ONLY.equals（州））{
//我们只能读取介质
mExternalStorageAvailable = TRUE;
mExternalStorageWriteable = FALSE;
} 其他 {
//别的东西是错误的。这可能是很多其他的国家之一，但
//我们所需要的
//知道的是，我们既不能读也不能写
mExternalStorageAvailable = mExternalStorageWriteable = FALSE;
}
如果（mExternalStorageAvailable＆安培;＆安培; mExternalStorageWriteable）{
对于（字符串项目：项目）{
文件F =新的文件（项目）;
如果（f.exists（））{
尝试 {
的FileInputStream FIS =新的FileInputStream（F）;
位图B = BitmapFactory.de codeStream（FIS）;
bitmaps.add（B）;
files.add（F）;
}赶上（FileNotFoundException异常E）{
Log.e（Prototype.TAG，，E）;
}
}
}
}
}
和XML布局：
＆LT; LinearLayout中的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：layout_width =FILL_PARENT
机器人：layout_height =FILL_PARENT
机器人：方向=垂直
机器人：重力=底
机器人：以下属性来=0px
机器人：paddingTop =0px
机器人：paddingRight =0px＆GT;
＆LT; com.unimelb.pt3.ui.TransparentPanel
机器人：ID =@ + ID /工作台
机器人：layout_width =FILL_PARENT
机器人：layout_height =10px的
机器人：paddingTop =0px
机器人：以下属性来=0px
机器人：paddingBottom会=0px
机器人：paddingRight =0px＆GT;
＆LT; GridView中的xmlns：机器人=http://schemas.android.com/apk/res/android
机器人：ID =@ + ID / GridView控件
机器人：layout_width =FILL_PARENT
机器人：layout_height =FILL_PARENT
机器人：columnWidth中=90dp
机器人：为numColumns =auto_fit
机器人：verticalSpacing =10dp
机器人：horizontalSpacing =10dp
机器人：stretchMode =columnWidth中
机器人：重力=中心/＆GT;
＆LT; /com.unimelb.pt3.ui.TransparentPanel>
＆LT; / LinearLayout中＆GT;
解决方案
在GridView有invalidateViews（）方法。
在调用此方法：所有的意见进行重建，并重新绘制。 http://developer.android.com/reference/android/widget/GridView.html
我想这是你所需要的：）
I have a GridView which is pretty similar to the Google tutorial, except that I want to add the ImageViews on runtime (via a subactivity). The results are okay, but the layout of the View is messed up: The GridView doesn't fill the content of its parent, what do I have to do to design it properly?
Here the code of adding the children:
public void initializeWorkbench(GridView gv, Vector<String> items) {
Prototype.workbench.setDimension(screenWidth, divider.height()+workbenchArea.height());
Prototype.workbench.activateWorkbench();
// this measures the workbench correctly
Log.d(Prototype.TAG, "workbench width: "+Prototype.workbench.getMeasuredWidth());
// 320
Log.d(Prototype.TAG, "workbench height: "+Prototype.workbench.getMeasuredHeight());
// 30
ImageAdapter imgAdapter = new ImageAdapter(this.getContext(), items);
gv.setAdapter(imgAdapter);
gv.measure(screenWidth, screenHeight);
gv.requestLayout();
gv.forceLayout();
Log.d(Prototype.TAG, "gv width: "+gv.getMeasuredWidth());
// 22
Log.d(Prototype.TAG, "gv height: "+gv.getMeasuredHeight());
// 119
Prototype.workbench.setDimension(screenWidth, divider.height()+workbenchArea.height());
}
}
activateWorkbench, setDimension and measure in the workbench (LinearLayout above the GridView):
public void activateWorkbench() {
if(this.equals(Prototype.workbench)) {
this.setOrientation(VERTICAL);
show = true;
measure();
}
}
public void setDimension(int w, int h) {
width = w;
height = h;
this.setLayoutParams(new LinearLayout.LayoutParams(width, height));
this.invalidate();
}
private void measure() {
if (this.getOrientation() == LinearLayout.VERTICAL) {
int h = 0;
int w = 0;
this.measureChildren(0, 0);
for (int i = 0; i < this.getChildCount(); i++) {
View v = this.getChildAt(i);
h += v.getMeasuredHeight();
w = (w < v.getMeasuredWidth()) ? v.getMeasuredWidth() : w;
}
if (this.equals(Prototype.tagarea))
height = (h < height) ? height : h;
if (this.equals(Prototype.tagarea))
width = (w < width) ? width : w;
}
this.setMeasuredDimension(width, height);
}
The ImageAdapter constructor:
public ImageAdapter(Context c, Vector<String> items) {
mContext = c;
boolean mExternalStorageAvailable = false;
boolean mExternalStorageWriteable = false;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
// We can read and write the media
mExternalStorageAvailable = mExternalStorageWriteable = true;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
// We can only read the media
mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
} else {
// Something else is wrong. It may be one of many other states, but
// all we need
// to know is we can neither read nor write
mExternalStorageAvailable = mExternalStorageWriteable = false;
}
if (mExternalStorageAvailable && mExternalStorageWriteable) {
for (String item : items) {
File f = new File(item);
if (f.exists()) {
try {
FileInputStream fis = new FileInputStream(f);
Bitmap b = BitmapFactory.decodeStream(fis);
bitmaps.add(b);
files.add(f);
} catch (FileNotFoundException e) {
Log.e(Prototype.TAG, "", e);
}
}
}
}
}
And the xml layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="bottom"
android:paddingLeft="0px"
android:paddingTop="0px"
android:paddingRight="0px">
<com.unimelb.pt3.ui.TransparentPanel
android:id="@+id/workbench"
android:layout_width="fill_parent"
android:layout_height="10px"
android:paddingTop="0px"
android:paddingLeft="0px"
android:paddingBottom="0px"
android:paddingRight="0px">
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center" />
</com.unimelb.pt3.ui.TransparentPanel>
</LinearLayout>
解决方案
the GridView has an invalidateViews() method.
when you call this method: "all the views to be rebuilt and redrawn." http://developer.android.com/reference/android/widget/GridView.html
i think this is what you need:)
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