substuting的android点击带有计时器 [英] android substuting the click with a timer
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问题描述
我发现这个例子，我有一个小问题：我如何删除上点击一个计时器或在此它显示的第一映像，并等待几秒钟，然后移动到下一个图像延迟
<$p$p><$c$c>http://mobile.dzone.com/news/displaying-images-sd-card?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+javalobby%2Ffrontpage+%28Javalobby+%2F+Java+Zone%29感谢你。
包blog.android.sdcard;
进口android.app.Activity;
进口android.content.Context;
进口android.content.Intent;
进口android.database.Cursor;
进口android.net.Uri;
进口android.os.Bundle;
进口android.provider.MediaStore;
进口android.view.Menu;
进口android.view.MenuInflater;
进口android.view.MenuItem;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.AdapterView;
进口android.widget.BaseAdapter;
进口android.widget.GridView;
进口android.widget.ImageView;
进口android.widget.AdapterView.OnItemClickListener;
/ **
*从SD卡显示图像。
* /
公共类SDCardImagesActivity延伸活动{
/ **
*用游标从查询的图像在SD访问结果
* 卡。
* /
私人光标指针;
/ *
*为缩略图图像的ID列索引。
* /
私人诠释参数：columnIndex;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.sdcard）;
//设置我们想要的缩略图ID列的一个阵列
的String []投影= {MediaStore.Images.Thumbnails._ID};
//创建光标指向SD卡
光标= managedQuery（
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI，投影，//哪家
//列
// 至
// 返回
空，//返回所有行
空，MediaStore.Images.Thumbnails.IMAGE_ID）;
//获取缩略图图片ID列索引
参数：columnIndex =光标
.getColumnIndexOrThrow（MediaStore.Images.Thumbnails._ID）;
GridView控件sdcardImages =（GridView控件）findViewById（R.id.sdcard）;
sdcardImages.setAdapter（新ImageAdapter（本））;
//设置一个点击监听器
sdcardImages.setOnItemClickListener（新OnItemClickListener（）{
公共无效onItemClick（适配器视图父，视图V，INT位置，
长ID）{
//获取图像的数据的位置
的String []投影= {MediaStore.Images.Media.DATA};
光标= managedQuery（
MediaStore.Images.Media.EXTERNAL_CONTENT_URI，
投影，//哪些列返回
空，//返回所有行
NULL，NULL）;
参数：columnIndex =光标
.getColumnIndexOrThrow（MediaStore.Images.Media.DATA）;
cursor.moveToPosition（位置）;
//获取图像文件名
字符串的ImagePath = cursor.getString（参数：columnIndex）;
//使用这个路径做进一步的处理，即全屏幕
// 显示
}
}）;
}
/ **
*适配器为我们的图像文件。
* /
私有类ImageAdapter扩展了BaseAdapter {
私人上下文的背景下;
公共ImageAdapter（上下文localContext）{
上下文= localContext;
}
公众诠释getCount将（）{
返回cursor.getCount（）;
}
公共对象的getItem（INT位置）{
返回的位置;
}
众长getItemId（INT位置）{
返回的位置;
}
公共查看getView（INT位置，查看convertView，ViewGroup中父）{
ImageView的picturesView;
如果（convertView == NULL）{
picturesView =新ImageView的（上下文）;
//将光标移动到当前位置
cursor.moveToPosition（位置）;
//获取被请求的列的当前值
INT imageID = cursor.getInt（参数：columnIndex）;
//设置基于所提供的URI的图像的内容
picturesView.setImageURI（Uri.withAppendedPath（
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI，
+ imageID））;
picturesView.setScaleType（ImageView.ScaleType.FIT_CENTER）;
picturesView.setPadding（8,8，8,8）;
picturesView
.setLayoutParams（新GridView.LayoutParams（100，100））;
} 其他 {
picturesView =（ImageView的）convertView;
}
返回picturesView;
}
}
}
解决方案
无需线程。只需使用一个处理程序postDelayed消息...
公共类的HelloHandler延伸活动{
保护处理程序处理程序=新的处理程序（）;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
// 等等等等等等
handler.postDelayed（新UpdateTask（），500）;
}
保护类UpdateTask实现Runnable {
公共无效的run（）{
//做的东西。这是UI线程。
handler.postDelayed（本，500）;
}
}
}
I found this example and i have a small question: How can I remove the on click to a timer or a delay where it displays the first image and waits a couple of seconds then moves to the next image?
http://mobile.dzone.com/news/displaying-images-sd-card?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+javalobby%2Ffrontpage+%28Javalobby+%2F+Java+Zone%29
Thank you.
package blog.android.sdcard;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
/**
* Displays images from an SD card.
*/
public class SDCardImagesActivity extends Activity {
/**
* Cursor used to access the results from querying for images on the SD
* card.
*/
private Cursor cursor;
/*
* Column index for the Thumbnails Image IDs.
*/
private int columnIndex;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sdcard);
// Set up an array of the Thumbnail Image ID column we want
String[] projection = { MediaStore.Images.Thumbnails._ID };
// Create the cursor pointing to the SDCard
cursor = managedQuery(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, // Which
// columns
// to
// return
null, // Return all rows
null, MediaStore.Images.Thumbnails.IMAGE_ID);
// Get the column index of the Thumbnails Image ID
columnIndex = cursor
.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
GridView sdcardImages = (GridView) findViewById(R.id.sdcard);
sdcardImages.setAdapter(new ImageAdapter(this));
// Set up a click listener
sdcardImages.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v, int position,
long id) {
// Get the data location of the image
String[] projection = { MediaStore.Images.Media.DATA };
cursor = managedQuery(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null, null);
columnIndex = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToPosition(position);
// Get image filename
String imagePath = cursor.getString(columnIndex);
// Use this path to do further processing, i.e. full screen
// display
}
});
}
/**
* Adapter for our image files.
*/
private class ImageAdapter extends BaseAdapter {
private Context context;
public ImageAdapter(Context localContext) {
context = localContext;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// Set the content of the image based on the provided URI
picturesView.setImageURI(Uri.withAppendedPath(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""
+ imageID));
picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER);
picturesView.setPadding(8, 8, 8, 8);
picturesView
.setLayoutParams(new GridView.LayoutParams(100, 100));
} else {
picturesView = (ImageView) convertView;
}
return picturesView;
}
}
}
解决方案
No need for threads. Just use a Handler with postDelayed messages...
public class HelloHandler extends Activity {
protected Handler handler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// blah blah blah
handler.postDelayed(new UpdateTask(),500);
}
protected class UpdateTask implements Runnable {
public void run() {
// Do stuff. This is UI thread.
handler.postDelayed(this, 500);
}
}
}
这篇关于substuting的android点击带有计时器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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