Android onTouch事件仅第一次被调用
我有一个Android应用程序的图库查看器 我需要先展示一张大图,然后在它下面展示其他图片的缩略图。 5秒钟后,缩略图消失,当用户触摸屏幕时,缩略图应再次出现 这里的问题是,如果缩略图再次出现,它们将不再消失,因此这只是第一次工作 如何解决此问题 这是我的布局代码:Android onTouch事件仅第一次被调用,android,android-layout,android-gallery,ontouchlistener,Android,Android Layout,Android Gallery,Ontouchlistener,我有一个Android应用程序的图库查看器 我需要先展示一张大图,然后在它下面展示其他图片的缩略图。 5秒钟后,缩略图消失,当用户触摸屏幕时,缩略图应再次出现 这里的问题是,如果缩略图再次出现,它们将不再消失,因此这只是第一次工作 如何解决此问题 这是我的布局代码: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/an
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<ImageView
android:id="@+id/GalleryImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" >
</ImageView>
<Gallery
android:id="@+id/GalleryThumbnails"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/GalleryImage" />
</RelativeLayout>
这是我的实现:
public class GalleryView extends Activity {
Integer[] pics = { R.drawable.antartica1, R.drawable.antartica2, R.drawable.antartica3, R.drawable.antartica4, R.drawable.antartica5, R.drawable.antartica6, R.drawable.antartica7,
R.drawable.antartica8, R.drawable.antartica9, R.drawable.antartica10 };
ImageView imageView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery_view_layout);
final Gallery ga = (Gallery) findViewById(R.id.GalleryThumbnails);
ga.setAdapter(new ImageAdapter(this));
imageView = (ImageView) findViewById(R.id.GalleryImage);
// We show the first image when creating the view gallery
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setImageResource(pics[0]);
// Hiding the thumbnails after 5 seconds
final View v = new View(this);
v.postDelayed(new Runnable() {
public void run() {
ga.setVisibility(View.GONE);
}
}, (long) 5000);
// Showing the thumbnails again when touching the screen
// TODO: Not working yet
imageView.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
ga.setVisibility(View.VISIBLE);
}
return false;
}
});
ga.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setImageResource(pics[arg2]);
}
});
}
public class ImageAdapter extends BaseAdapter {
private Context ctx;
int imageBackground;
public ImageAdapter(Context c) {
ctx = c;
TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1);
imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1);
ta.recycle();
}
public int getCount() {
return pics.length;
}
public Object getItem(int arg0) {
return arg0;
}
public long getItemId(int arg0) {
return arg0;
}
// Thumbnails gallery
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView iv = new ImageView(ctx);
iv.setImageResource(pics[arg0]);
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.setLayoutParams(new Gallery.LayoutParams(200, 120));
iv.setBackgroundResource(imageBackground);
return iv;
}
}
}
公共类GalleryView扩展活动{
整数[]pics={R.drawable.antartica1,R.drawable.antartica2,R.drawable.antartica3,R.drawable.antartica4,R.drawable.antartica5,R.drawable.antartica6,R.drawable.antartica7,
R.drawable.antartica8,R.drawable.antartica9,R.drawable.antartica10};
图像视图图像视图;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery\u view\u layout);
最终画廊ga=(画廊)findViewById(R.id.GalleryThumbnails);
ga.setAdapter(新的ImageAdapter(this));
imageView=(imageView)findViewById(R.id.GalleryImage);
//我们在创建视图库时显示第一个图像
imageView.setScaleType(imageView.ScaleType.CENTER);
setImageResource(pics[0]);
//5秒后隐藏缩略图
最终视图v=新视图(本);
v、 postDelayed(新的Runnable(){
公开募捐{
ga.setVisibility(视图已消失);
}
}(长)5000);
//触摸屏幕时再次显示缩略图
//托多:还没开始工作
setOnTouchListener(新的OnTouchListener(){
公共布尔onTouch(视图v,运动事件){
if(event.getAction()==MotionEvent.ACTION\u向下){
ga.setVisibility(视图可见);
}
返回false;
}
});
ga.setOnItemClickListener(新的OnItemClickListener(){
公共视图单击(AdapterView arg0、视图arg1、整型arg2、长型arg3){
imageView.setScaleType(imageView.ScaleType.CENTER);
setImageResource(pics[arg2]);
}
});
}
公共类ImageAdapter扩展了BaseAdapter{
私有上下文ctx;
int图像背景;
公共图像适配器(上下文c){
ctx=c;
TypedArray ta=获得的StyledAttributes(R.styleable.Gallery1);
imageBackground=ta.getResourceId(R.styleable.Gallery1\u android\u galleryItemBackground,1);
ta.recycle();
}
public int getCount(){
返回图片长度;
}
公共对象getItem(int arg0){
返回arg0;
}
公共长getItemId(int arg0){
返回arg0;
}
//缩略图库
公共视图getView(int arg0、视图arg1、视图组arg2){
ImageView iv=新的ImageView(ctx);
iv.setImageResource(pics[arg0]);
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.设置布局参数(新画廊布局参数(200120));
iv.挫折背景资源(图像背景);
回报四;
}
}
}
提前多谢 让我自己明白了:只需在
setOnItemClickListener
中包含对计时器的另一个调用:
ga.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
final View v = new View(getApplicationContext());
v.postDelayed(new Runnable() {
public void run() {
ga.setVisibility(View.GONE);
}
}, (long) 5000);
imageView.setScaleType(ImageView.ScaleType.CENTER);
imageView.setImageResource(pics[arg2]);
}
});
ga.setOnItemClickListener(新的OnItemClickListener(){
公共视图单击(AdapterView arg0、视图arg1、整型arg2、长型arg3){
最终视图v=新视图(getApplicationContext());
v、 postDelayed(新的Runnable(){
公开募捐{
ga.setVisibility(视图已消失);
}
}(长)5000);
imageView.setScaleType(imageView.ScaleType.CENTER);
setImageResource(pics[arg2]);
}
});
这就是所有人:)这是奇怪的代码
final View v = new View(this);
v.postDelayed(new Runnable() {
public void run() {
ga.setVisibility(View.GONE);
}
}, (long) 5000);
您正在创建一个悬空视图,以便安排对ga的延迟调用
我想你是说
private Gallery ga; // make ga to a member
private void scheduleHide ()
{
ga.postDelayed(new Runnable() {
public void run() {
ga.setVisibility(View.GONE);
}
}, (long) 5000);
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gallery_view_layout);
ga = (Gallery) findViewById(R.id.GalleryThumbnails);
...
scheduleHide ();
...
imageView.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
ga.setVisibility(View.VISIBLE);
scheduleHide ();
}
return false;
}
});
...
是的,这确实是我代码的一个更好的版本,经过重构和可重用,非常感谢!