你好如何打印文件列表...现在我试图打印我的文件列表......但我不打印...请帮助我....
这是我的编码：
package ImageViewExample.ImageViewExample;
import java.io.File;
import java.util.ArrayList;
import android.R.string;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.GridView;
//import android.widget.GridView;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
public class ImageViewExample extends Activity {
/** Called when the activity is first created. */
private Cursor imagecursor, actualimagecursor;
private int image_column_index, actual_image_column_index;
GridView imagegrid;
private int count;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init_phone_image_grid();
}
private void init_phone_image_grid() {
String[] img = { MediaStore.Images.Thumbnails._ID };
imagecursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
img, null,null,
MediaStore.Images.Thumbnails.IMAGE_ID + "");
System.out.println("cursor"+managedQuery(MediaStore.Images
.Thumbnails.EXTERNAL_CONTENT_URI, img, null,null,
MediaStore.Images.Thumbnails.IMAGE_ID + ""));
image_column_index =
imagecursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
System.out.println("index"+imagecursor.getColumnIndexOrThrow(MediaStore
.Images.Thumbnails._ID));
count = imagecursor.getCount();
System.out.println("image"+count);
imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imagegrid.setAdapter(new ImAdapterh(this));
imagegrid.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v,int position, long id)
{
System.gc();
String[] proj = { MediaStore.Images.Media.DATA };
actualimagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
proj,null, null, null);
// System.out.println("doubt"+managedQuery(MediaStore
.Images.Media.EXTERNAL_CONTENT_URI, proj,null, null, null));
actual_image_column_index =
actualimagecursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
actualimagecursor.moveToPosition(position);
String i = actualimagecursor.getString(actual_image_column_index);
System.gc();
Intent intent = new Intent(getApplicationContext(), ViewImage.class);
intent.putExtra("filename", i);
startActivity(intent);
}
});
}
public class ImAdapterh extends BaseAdapter{
File dir=new File(Environment.getExternalStorageDirectory(),"/myImages/");
int count=dir.list().length;
String[] fileNames = dir.list();
private Context mContext;
public ImAdapterh(Context c) {
mContext = c;
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = null;
for(String bitmapFileName : fileNames)
{
if (convertView == null)
{ // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new Gallery.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
Bitmap bmp = BitmapFactory.decodeFile(dir.getPath() + "/" +
bitmapFileName);
imageView.setImageBitmap(bmp);
}else
{
imageView = (ImageView) convertView;
}
} return imageView;
}
}}
我希望打印我的文件列表：
File dir=new File(Environment.getExternalStorageDirectory(),"/myImages/");
int count=dir.list().length;
String[] fileNames = dir.list();
logcat错误：
05-05 22:39:42.147: DEBUG/dalvikvm(739): GC_EXTERNAL_ALLOC freed 1035 objects / 68800
bytes in 141ms
05-05 22:39:42.497: DEBUG/dalvikvm(739): GC_EXTERNAL_ALLOC freed 418 objects / 217344
bytes in 118ms
05-05 22:39:42.568: DEBUG/AndroidRuntime(739): Shutting down VM
05-05 22:39:42.578: WARN/dalvikvm(739): threadid=1: thread exiting with uncaught
exception (group=0x4001d800)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): FATAL EXCEPTION: main
05-05 22:39:42.608: ERROR/AndroidRuntime(739): java.lang.ClassCastException:
android.widget.Gallery$LayoutParams
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.GridView.onMeasure(GridView.java:934)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.View.measure(View.java:8171)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.View.measure(View.java:8171)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.View.measure(View.java:8171)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.LinearLayout.measureVertical(LinearLayout.java:526)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.View.measure(View.java:8171)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.View.measure(View.java:8171)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.ViewRoot.performTraversals(ViewRoot.java:801)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.os.Handler.dispatchMessage(Handler.java:99)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.os.Looper.loop(Looper.java:123)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
android.app.ActivityThread.main(ActivityThread.java:4627)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
java.lang.reflect.Method.invokeNative(Native Method)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
java.lang.reflect.Method.invoke(Method.java:521)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-05 22:39:42.608: ERROR/AndroidRuntime(739): at
dalvik.system.NativeStart.main(Native Method)
05-05 22:39:42.638: WARN/ActivityManager(64): Force finishing activity
ImageViewExample.ImageViewExample/.ImageViewExample
05-05 22:39:43.157: WARN/ActivityManager(64): Activity pause timeout for
HistoryRecord{43fb0c88 ImageViewExample.ImageViewExample/.ImageViewExample}
答案 0 :(得分：0)
这会将您的文件打印到logcat，但请注意，此代码必须位于某个方法中，而不仅仅是在类中。
for (String fName : fileNames)
{
Log.i("MYAPPTAG", fName);
}