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sdcard 폴더에서 이미지를 가져 와서 gridview에서 볼 때 오류가 발생합니다.gridview에서 폴더 이미지 가져 오기
내 클래스를 다음과 같이
public class Favourites extends Activity{
String backupPath=Environment.getExternalStorageDirectory().getPath() + "/WallpaperPro";
String name;
GridView favgrid;
Cursor cursor;
int columnIndex;
String[] imagenames=new String[100];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try{
readfile();
}catch(Exception e)
{
}
setContentView(R.layout.fav);
favgrid=(GridView) findViewById(R.id.favgrid);
String[] projection = {MediaStore.Images.Media._ID};
// Create the cursor pointing to the SDCard
cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection,
null ,
null,
null);
// Get the column index of the image ID
Toast.makeText(getApplicationContext(),""+cursor.getCount() , 1).show();
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
favgrid.setAdapter(new FavAdapter(this));
}
public void readfile()
{
//File sdCardRoot = Environment.getExternalStorageDirectory();
File yourDir = new File(backupPath);
int i=0;
for (File f : yourDir.listFiles()) {
if (f.isFile())
name = f.getName();
imagenames[i]=backupPath+"/"+name;
Log.i("CUTEWALLPAPER", "imagenames["+i+"]= "+name);
i++;
// make something with the name
}
}
public class FavAdapter extends BaseAdapter {
private Context mContext;
public FavAdapter(Context c) {
mContext = c;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return imagenames.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public ImageView getView(int position, View convertView, ViewGroup parent) {
// ImageView i = new ImageView(mContext);
ImageView imageView;
imageView = new ImageView(mContext);
if (convertView == null) {
imageView.setLayoutParams(new GridView.LayoutParams(100, 100));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(0, 0, 0, 0);
} else {
imageView = (ImageView) convertView;
}
Bitmap b=BitmapFactory.decodeFile(imagenames[position].toString());
Log.i("CUTEWALLPAPER", "Position"+position+" "+b.getHeight());
imageView.setImageBitmap(b);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
/* Set the Width/Height of the ImageView. */
imageView.setLayoutParams(new GridView.LayoutParams(300, 300));
return imageView;
}
}
}
그리고 같은 내 xml 파일은 다음과 같습니다
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:weightSum="1" android:orientation="horizontal" android:layout_height="wrap_content">
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/favgrid"
android:layout_width="fill_parent"
android:columnWidth="90dp"
android:numColumns="1"
android:verticalSpacing="0dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center" android:layout_height="fill_parent"/>
</RelativeLayout>
로그 캣 오류가 널 포인터 예외를 보여줍니다.
07-06 22:57:26.892: ERROR/AndroidRuntime(302): java.lang.NullPointerException
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at com.cutewallpaper.Favourites$FavAdapter.getView(Favourites.java:112)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at com.cutewallpaper.Favourites$FavAdapter.getView(Favourites.java:1)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.AbsListView.obtainView(AbsListView.java:1274)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.GridView.makeAndAddView(GridView.java:1218)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.GridView.makeRow(GridView.java:265)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.GridView.fillDown(GridView.java:218)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.GridView.fillFromTop(GridView.java:337)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.GridView.layoutChildren(GridView.java:1112)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.AbsListView.onLayout(AbsListView.java:1113)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.View.layout(View.java:6830)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:900)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.View.layout(View.java:6830)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.View.layout(View.java:6830)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.LinearLayout.onLayout(LinearLayout.java:918)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.View.layout(View.java:6830)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.View.layout(View.java:6830)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.ViewRoot.performTraversals(ViewRoot.java:996)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.os.Handler.dispatchMessage(Handler.java:99)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.os.Looper.loop(Looper.java:123)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at android.app.ActivityThread.main(ActivityThread.java:4363)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at java.lang.reflect.Method.invokeNative(Native Method)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at java.lang.reflect.Method.invoke(Method.java:521)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-06 22:57:26.892: ERROR/AndroidRuntime(302): at dalvik.system.NativeStart.main(Native Method)
나는 이것을 해결하는 방법을 알지 못했다. 당신이 100 크기 imagenames 배열을 사용하는 사전
당신을 얻을 수 없습니다 .. 당신이 물어 보는 라인 – Shalini
비트 맵 b = BitmapFactory.decodeFile (imagenames [position] .toString()) ;. 112의 라인입니다. – Shalini
SDCard에서 모든 이미지를 검색해야합니까? – Venky