So, here is the thing. I wanted to experiment a bit. So, i wrote this program which looks for images with (.jpg) extension in my mnt/shared/Newpictures folder in my GennyMotion Emulator. In my program, i captured the name of the files with .jpg extension in a String array adapter and the file path in a filepath string array. Now, here is the part where i am blank, i have the path,name and i can get the position by clicking on the list. But how do i open the image when i click on the list. I researched online and most of the codes were too confusing. So, may be someone can suggest me an easier approach. This is what i tried so far. Thanks.
package com.example.user.imageapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.io.File;
import java.util.ArrayList;
/**
* Created by user on 06-08-2015.
*/
public class Splash extends Activity {
Button load;
String s;
private ListView mainList;
private String[] FilePathStrings;
ArrayList<String>filesinFolder = GetFiles("/mnt/shared/NewPictures");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
// load = (Button)findViewById(R.id.Load);
mainList = (ListView) findViewById(R.id.imagelist);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,filesinFolder );
mainList.setAdapter(adapter);
mainList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//what do i put here
}
});
}
public ArrayList<String> GetFiles(String DirectoryPath)
{
ArrayList<String> MyFiles = new ArrayList<String>();
File f = new File(DirectoryPath);
f.mkdirs();
File[] files = f.listFiles();
FilePathStrings = new String[files.length];
for (int i = 0; i < files.length; i++) {
// Get the path of the image file
if(files[i].getName().contains(".jpg")) {
FilePathStrings[i] = files[i].getAbsolutePath();
// Get the name image file
MyFiles.add(files[i].getName());
}
}
return MyFiles;
}
}
答案 0 :(得分：1)
A simple way to achieve this would be to create a dialog containing an imageview and then set the imageview's image to the file. Something like this should do the job:
public void onItemclick(AdapterView<?> adapterView, View view, int pos, long id){
String filePath = filesInFolder.get(pos);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.dialog_img_preview, null);
builder.setView(view);
ImageView imgView = (ImageView)view.findViewById(R.id.preview_imgview);
imgView.setImageBitmap(BitmapFactory.decodeFile(filePath));
AlertDialog dialog = builder.create();
dialog.show();
}
答案 1 :(得分：1)
以下是一个简单的示例，如何通过单击gridview查看图像，但您可以在xml文件中更改为listview。
这是gridview显示。
<强> GridViewActivity.java
public class GridViewActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gridview);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(GridViewActivity.this));
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
// Send intent to SingleViewActivity
Intent i = new Intent(getApplicationContext(), SingleViewActivity.class);
// Pass image index
i.putExtra("id", position);
startActivity(i);
}
});
}
}
此课程将以单页显示图像。
<强> SingleViewActivity.java
public class SingleViewActivity extends Activity {
ImageLoader imageLoader = ImageLoader.getInstance();
private DisplayImageOptions options;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_view);
options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisk(true).considerExifParams(true)
.showImageForEmptyUri(R.mipmap.ic_launcher)
.imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2)
.bitmapConfig(Bitmap.Config.RGB_565).build();
// Get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter imageAdapter = new ImageAdapter(this);
ImageView imageView = (ImageView) findViewById(R.id.SingleView);
//imageView.setImageResource(imageAdapter.mThumbnames[position]);
imageLoader.displayImage(imageAdapter.mThumbnames[position],imageView,options);
}
}
我使用了一些来自互联网的随机图片。列表视图中使用了相同的概念来显示图像。
<强> ImageAdapter.java
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater layoutInflater;
ImageLoader imageLoader = ImageLoader.getInstance();
private DisplayImageOptions options;
// Constructor
public ImageAdapter(Context c) {
mContext = c;
layoutInflater = LayoutInflater.from(mContext);
options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisk(true).considerExifParams(true)
.showImageForEmptyUri(R.mipmap.ic_launcher)
.imageScaleType(ImageScaleType.IN_SAMPLE_POWER_OF_2)
.bitmapConfig(Bitmap.Config.RGB_565).build();
}
public int getCount() {
return mThumbnames.length;
}
public Integer getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder1 holder;
if (convertView == null) {
convertView = layoutInflater.inflate(R.layout.grideview_item, null);
holder = new ViewHolder1();
holder.image = (ImageView) convertView.findViewById(R.id.imageView);
convertView.setTag(holder);
} else {
holder = (ViewHolder1) convertView.getTag();
}
// Load image, decode it to Bitmap and display Bitmap in ImageView (or any other view
// which implements ImageAware interface)
//imageLoader.displayImage("drawable://" + mThumbIds[position], holder.image);
imageLoader.displayImage(mThumbnames[position], holder.image, options);
//holder.image.setImageDrawable(mContext.getResources().getDrawable(mThumbIds[position]));
return convertView;
}
public static class ViewHolder1 {
ImageView image;
}
// Keep all Images in array
/* public Integer[] mThumbIds = {
R.drawable.ab, R.drawable.ac,
R.drawable.ad, R.drawable.ae
};*/
public String[] mThumbnames = {
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg",
"http://cdn2.ubergizmo.com/wp-content/uploads/2012/05/android_lock.jpg"
};
}
<强> gridview_item.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="left"
android:paddingBottom="5dp"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="10dp"
android:scaleType="fitXY" />
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_gravity="center|bottom"
android:layout_marginBottom="5dip"
android:background="#80000000"
android:gravity="center"
android:text="images"
android:textColor="#000000"
android:textSize="20dp" />
</FrameLayout>