我想开发一个活动,以列表视图格式显示带有名称的图像列表。我有使用 BaseAdapter 的代码自定义适配器。在模拟器中运行时总是向我显示一个调试器窗口,并且模拟器上没有任何内容。
指定文件夹下有图像 (11) 图像,并授予用户权限 WRITE_EXTERNAL_STORAGE。
下面是代码。(ImageViewer.java)
package com.example.imageviewer;
import java.io.File;
import java.io.FileFilter;
import java.sql.Array;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.zip.Inflater;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.audiofx.EnvironmentalReverb;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class ImageViewer extends Activity {
File oDirectory;
ListView oLVImages ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_image_viewer);
try
{
oLVImages = (ListView) findViewById(R.id.lvImages);
String strPath = Environment.getExternalStorageDirectory().getPath() + File.separator + Environment.DIRECTORY_PICTURES;
oDirectory = new File(strPath);
Log.d("ImageViewer", strPath);
populateImages (oDirectory);
}
catch(Exception e){
Log.d("ImageViewer", "1 " + e.getMessage());
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_image_viewer, menu);
return true;
}
public void populateImages (File oDirectory){
try{
File[] oFiles = oDirectory.listFiles();
ArrayList<Image> oImages = new ArrayList<ImageViewer.Image>();
for (int i = 0 ; i < oFiles.length;i++){
if (oFiles[i].isFile())
{
Image x = new Image();
x.imgPath = oFiles[i].getPath().toString();
x.imgName = oFiles[i].getName().toString();
oImages.add(x);
}
}
ImageListAdapter oImageListAdapter = new ImageListAdapter(getApplicationContext(), oImages);
oLVImages.setAdapter(oImageListAdapter);
}
catch (Exception e){
Log.d("ImageViewer", e.getMessage());
}
}
class Image{
private String imgName ;
private String imgPath;
public Image(){
super();
imgName = "";
imgPath = "";
}
public Image (String imgName, String imgPath){
super();
this.imgName = imgName;
this.imgPath = imgPath;
}
}
public class ImageListAdapter extends BaseAdapter{
ArrayList<Image> imgImageList;
Context oContext;
public ImageListAdapter(Context oContext, ArrayList<Image> oImage){
this.imgImageList = oImage;
this.oContext = oContext;
}
public int getCount() {
// TODO Auto-generated method stub
return imgImageList.size();
}
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return this.imgImageList.get(arg0);
}
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
//super.getView(arg0, arg1, arg2);
View oView = arg1;
LayoutInflater inflater = getLayoutInflater();
oView = inflater.inflate(R.layout.imagedetail, null);
ImageView iv = (ImageView) findViewById(R.id.ivimage);
TextView tv = (TextView) findViewById(R.id.tvimage);
Image oIM = imgImageList.get(arg0);
Bitmap oBM = BitmapFactory.decodeFile(oIM.imgPath);
iv.setImageBitmap(oBM);
tv.setText(oIM.imgName.toString());
return oView;
}
}
}
字符串.xml 文件:
<resources>
<string name="app_name">ImageViewer</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_image_viewer">Image Viewer</string>
<string name="ivimage"></string>
<string name="tvheader">Photos</string>
</resources>
activity_image_viewer.xml 文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/tvheader"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#FFFFFFFF"
android:padding="10dp"
android:text="@string/tvheader"
android:textSize="22dp"
android:background="#FF336699"
/>
<ListView
android:id="@+id/lvImages"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>
imagedetail.xml(ListView每一项的布局文件)
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="1"
android:padding="10dp"
android:id="@+id/tbllayout" >
<TableRow
android:id="@+id/tblrow"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/ivimage"
android:layout_width="100dp"
android:layout_height="100dp"
android:padding="10dp"
android:contentDescription="@string/ivimage"
/>
<TextView
android:id="@+id/tvimage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
/>
</TableRow>
</TableLayout>