I am trying to listing images from sdcard ("mydata") folder with Thumb and Name...
我试图用拇指和名字列出sdcard(“mydata”)文件夹中的图像...
I am reading data from sdcard and then trying to displaying it in a ListView for that i am using ArrayList but now i am not getting How to add data into ArrayList, check my code below:
我正在从SD卡读取数据,然后尝试在ListView中显示它,因为我正在使用ArrayList但现在我没有得到如何将数据添加到ArrayList中,请检查下面的代码:
Actors.java:-
public class Actors {
private String name;
private String status;
private String thumb;
public Actors() {
// TODO Auto-generated constructor stub
}
public Actors(String name, String status, String thumb) {
super();
this.name = name;
this.status = status;
this.thumb = thumb;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getThumb() {
return thumb;
}
public void setThumb(String thumb) {
this.thumb = thumb;
}
}
ActorAdapter.java:-
public class ActorAdapter extends BaseAdapter {
ArrayList<Actors> actorList;
LayoutInflater vi;
int Resource;
ViewHolder holder;
public ActorAdapter(Context context, int resource, ArrayList<Actors> objects) {
vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
actorList = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// convert view = design
View v = convertView;
if (v == null) {
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.thumbnail = (ImageView) v.findViewById(R.id.thumbnail);
holder.textName = (TextView) v.findViewById(R.id.textName);
holder.textStatus = (TextView) v.findViewById(R.id.textStatus);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
String strName = actorList.get(position).getName().toString();
Log.v("strName", strName);
String strStatus = actorList.get(position).getStatus().toString();
Log.v("strStaus", strStatus);
// Name
String fileName = strName.substring(strName.lastIndexOf('/')+1, strName.length() );
File file = new File(strName);
long length = file.length();
holder.textName.setText(fileName + " ("+length/1024+" KB.)");
Log.v("getName", holder.textName.getText().toString());
// Thumb
holder.thumbnail.setScaleType(ImageView.ScaleType.CENTER_CROP);
Bitmap bm = BitmapFactory.decodeFile(strName);
holder.thumbnail.setImageBitmap(bm);
// Status
holder.textStatus.setText(strStatus);
Log.v("getStaus", holder.textStatus.getText().toString());
return v;
}
static class ViewHolder {
public ImageView thumbnail;
public TextView textName;
public TextView textStatus;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return actorList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return actorList.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
}
MainActivity.java:-
public class MainActivity extends Activity {
ArrayList<Actors> actorsList;
ActorAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
actorsList = new ArrayList<Actors>();
File f = new File ("/mnt/sdcard/mydata/");
File[] files = f.listFiles ();
for (int i = 0; i <files.length; i++)
{
File file = files[i];
Log.d("Count",file.getPath());
Actors actor = new Actors();
actor.setName(file.getPath());
actorsList.add (actor);
}
ListView listview = (ListView)findViewById(R.id.list);
adapter = new ActorAdapter(getApplicationContext(), R.layout.row, actorsList);
adapter.notifyDataSetChanged();
listview.setAdapter(adapter);
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), actorsList.get(position).getName(), Toast.LENGTH_LONG).show();
}
});
}
}
Logcat:-
03-18 03:33:54.964: E/AndroidRuntime(1566): FATAL EXCEPTION: main
03-18 03:33:54.964: E/AndroidRuntime(1566): Process: com.wingnity.jsonparsingtutorial, PID: 1566
03-18 03:33:54.964: E/AndroidRuntime(1566): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wingnity.jsonparsingtutorial/com.wingnity.jsonparsingtutorial.MainActivity}: java.lang.NullPointerException
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread.access$800(ActivityThread.java:135)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.os.Handler.dispatchMessage(Handler.java:102)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.os.Looper.loop(Looper.java:136)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-18 03:33:54.964: E/AndroidRuntime(1566): at java.lang.reflect.Method.invokeNative(Native Method)
03-18 03:33:54.964: E/AndroidRuntime(1566): at java.lang.reflect.Method.invoke(Method.java:515)
03-18 03:33:54.964: E/AndroidRuntime(1566): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-18 03:33:54.964: E/AndroidRuntime(1566): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-18 03:33:54.964: E/AndroidRuntime(1566): at dalvik.system.NativeStart.main(Native Method)
03-18 03:33:54.964: E/AndroidRuntime(1566): Caused by: java.lang.NullPointerException
03-18 03:33:54.964: E/AndroidRuntime(1566): at com.wingnity.jsonparsingtutorial.MainActivity.onCreate(MainActivity.java:29)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.Activity.performCreate(Activity.java:5231)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
03-18 03:33:54.964: E/AndroidRuntime(1566): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
03-18 03:33:54.964: E/AndroidRuntime(1566): ... 11 more
Getting NPE : for (int i = 0; i <files.length; i++)
获取NPE:for(int i = 0; i
row.xml:-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="8dp" >
<!-- Thumbnail Image -->
<ImageView
android:id="@+id/thumbnail"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_alignParentLeft="true"
android:contentDescription="@string/app_name"
android:src="@drawable/ic_launcher"
android:layout_marginRight="8dp" />
<!-- Movie textName -->
<TextView
android:id="@+id/textName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/thumbnail"
android:layout_toRightOf="@+id/thumbnail"
android:text="Image Name" />
<!-- textStatus -->
<TextView
android:id="@+id/textStatus"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/textName"
android:layout_toRightOf="@+id/thumbnail"
android:text="Status" />
<!-- Release Year -->
<Button
android:id="@+id/btnUpload"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textStatus"
android:text="Upload"
style="?android:attr/buttonStyleSmall"
android:layout_toRightOf="@+id/thumbnail" />
</RelativeLayout>
activity_main.xml:-
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" android:background="#F1F1F1"
tools:context=".MainActivity" >
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:listitem="@layout/row" >
</ListView>
</LinearLayout>
2 个解决方案
#1
1
try this...
for (int i = 0; i <files.length; i++)
{
File file = files[i];
Log.d("Count",file.getPath());
Actors actor = new Actors();
actor.setName("file name here");
actor.setStatus("file status here");
actor.setThumb("file thumb here");
actorsList.add (actor);
}
#2
1
You should add item to your ArrayList like
您应该将项添加到您的ArrayList中
actorsList.add(new Actors("FileName","Status","thumb"));
You create actorsList with the type ArrayList<Actors>
您可以使用ArrayList
#1
1
try this...
for (int i = 0; i <files.length; i++)
{
File file = files[i];
Log.d("Count",file.getPath());
Actors actor = new Actors();
actor.setName("file name here");
actor.setStatus("file status here");
actor.setThumb("file thumb here");
actorsList.add (actor);
}
#2
1
You should add item to your ArrayList like
您应该将项添加到您的ArrayList中
actorsList.add(new Actors("FileName","Status","thumb"));
You create actorsList with the type ArrayList<Actors>
您可以使用ArrayList