遍歷指定目錄下的圖片檔案 顯示在gridview
阿新 • • 發佈：2019-02-20
gridview佈局
<?xml version="1.0" encoding="utf-8"?> <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" />
item配件佈局
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/root" android:orientation="vertical" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" > <ImageView android:id="@+id/image" android:layout_width="100dp" android:layout_height="150dp" android:layout_gravity="center" android:scaleType="fitXY" android:padding="4dp" /> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:gravity="center_horizontal" /> </LinearLayout>
主Activity
介面卡package com.su.testgrid3; import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemLongClickListener; import android.widget.GridView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; public class TestGrid3Activity extends Activity { private GridView gridView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); String[] titles = FileUtil.getImageNames("/mnt/sdcard/k/"); String[] imagePaths = new String[titles.length]; for (int i = 0; i < titles.length; i++) { imagePaths[i]="/mnt/sdcard/k/"+titles[i]; } gridView = (GridView) findViewById(R.id.gridview); PictureAdapter adapter = new PictureAdapter(titles, imagePaths, this); gridView.setAdapter(adapter); gridView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(TestGrid3Activity.this, "你點選了" + (position + 1), Toast.LENGTH_SHORT).show(); } }); gridView.setOnItemLongClickListener(new OnItemLongClickListener(){ public boolean onItemLongClick(AdapterView<?> parent, View v, int position, long id) { Toast.makeText(TestGrid3Activity.this, "你長按了" + (position + 1), Toast.LENGTH_SHORT).show(); return true; /* * 這裡需要true * 因為:OnItemLongClick事件中：down事件返回值標記此次事 * 件是否為點選事件（返回false，是點選事件；返回true，不記為點選事件）， * 而up事件標記此次事件結束時間，也就是判斷是否為長按。 */ } }); } }
// 2012-4-18下午07:46:57
package com.su.testgrid3;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
//自定義介面卡
class PictureAdapter extends BaseAdapter {
private LayoutInflater inflater;
private List<Picture> pictures;
public PictureAdapter(String[] titles, String[] images, Context context) {
super();
pictures = new ArrayList<Picture>();
inflater = LayoutInflater.from(context);
for (int i = 0; i < images.length; i++) {
Picture picture = new Picture(titles[i], images[i]);
pictures.add(picture);
}
}
@Override
public int getCount() {
if (null != pictures) {
return pictures.size();
} else {
return 0;
}
}
@Override
public Object getItem(int position) {
return pictures.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.picture_item, null);
viewHolder = new ViewHolder();
viewHolder.title = (TextView) convertView.findViewById(R.id.title);
viewHolder.image = (ImageView) convertView.findViewById(R.id.image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.title.setText(pictures.get(position).getTitle());
viewHolder.image.setImageBitmap(BitmapFactory.decodeFile(pictures.get(
position).getImageId()));
return convertView;
}
}
class ViewHolder {
public TextView title;
public ImageView image;
}picture的javabean
// 2012-4-18下午07:47:44
package com.su.testgrid3;
class Picture {
private String title;
private String imageId;
public Picture() {
super();
}
public Picture(String title, String imageId) {
super();
this.title = title;
this.imageId = imageId;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImageId() {
return imageId;
}
public void setImageId(String imageId) {
this.imageId = imageId;
}
}獲取圖片檔案的名字陣列的操作類
// 2012-4-18下午07:49:44
package com.su.testgrid3;
import java.io.File;
public class FileUtil {
public static String[] getImageNames(String folderPath) {
File file01 = new File(folderPath);
String[] files01 = file01.list();
int imageFileNums = 0;
for (int i = 0; i < files01.length; i++) {
File file02 = new File(folderPath + "/" + files01[i]);
if (!file02.isDirectory()) {
if (isImageFile(file02.getName())) {
imageFileNums++;
}
}
}
String[] files02 = new String[imageFileNums];
int j = 0;
for (int i = 0; i < files01.length; i++) {
File file02 = new File(folderPath + "/" + files01[i]);
if (!file02.isDirectory()) {
if (isImageFile(file02.getName())) {
files02[j] = file02.getName();
j++;
}
}
}
return files02;
}
private static boolean isImageFile(String fileName) {
String fileEnd = fileName.substring(fileName.lastIndexOf(".") + 1,
fileName.length());
if (fileEnd.equalsIgnoreCase("jpg")) {
return true;
} else if (fileEnd.equalsIgnoreCase("png")) {
return true;
} else if (fileEnd.equalsIgnoreCase("bmp")) {
return true;
} else {
return false;
}
}
}
