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嗨現在試圖創建文件夾在我的畫廊....通常我的網格視圖單獨顯示圖像，但我需要在我的畫廊文件夾。所以，我正在使用文件類....如果我運行我的項目日誌貓指示錯誤如何解決這些錯誤？請檢查我的編碼也.....如何解決日誌貓錯誤？項目ImageViewExample
ImageViewExample.java
package ImageViewExample.ImageViewExample;
import java.io.File;
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.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 + "");
image_column_index = imagecursor
.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
count = imagecursor.getCount();
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);
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 null;
}
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);
System.out.println(dir);
imageView.setImageBitmap(bmp);
}else
{
imageView = (ImageView) convertView;
}
}
return imageView;
}
}}
logcat的錯誤：
04-29 14:56:23.011: DEBUG/AndroidRuntime(415): >>>>>>>>>>>>>> AndroidRuntime START
<<<<<<<<<<<<<<
04-29 14:56:23.021: DEBUG/AndroidRuntime(415): CheckJNI is ON
04-29 14:56:23.402: DEBUG/AndroidRuntime(415): --- registering native functions ---
04-29 14:56:24.781: DEBUG/AndroidRuntime(415): Shutting down VM
04-29 14:56:24.791: DEBUG/dalvikvm(415): Debugger has detached; object registry had 1
entries
04-29 14:56:24.821: INFO/AndroidRuntime(415): NOTE: attach of thread 'Binder Thread
#3' failed
04-29 14:56:25.761: DEBUG/AndroidRuntime(423): >>>>>>>>>>>>>> AndroidRuntime START
<<<<<<<<<<<<<<
04-29 14:56:25.761: DEBUG/AndroidRuntime(423): CheckJNI is ON
04-29 14:56:26.141: DEBUG/AndroidRuntime(423): --- registering native functions ---
04-29 14:56:27.552: INFO/ActivityManager(66): Starting activity: Intent {
act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000
cmp=ImageViewExample.ImageViewExample/.ImageViewExample }
04-29 14:56:28.182: DEBUG/AndroidRuntime(423): Shutting down VM
04-29 14:56:28.232: DEBUG/dalvikvm(423): Debugger has detached; object registry had 1
entries
04-29 14:56:28.291: INFO/ActivityManager(66): Start proc
ImageViewExample.ImageViewExample for activity
ImageViewExample.ImageViewExample/.ImageViewExample: pid=430 uid=10050 gids={}
04-29 14:56:28.312: INFO/AndroidRuntime(423): NOTE: attach of thread 'Binder Thread
#3' failed
04-29 14:56:29.641: DEBUG/AndroidRuntime(430): Shutting down VM
04-29 14:56:29.641: WARN/dalvikvm(430): threadid=1: thread exiting with uncaught
exception (group=0x4001d800)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): FATAL EXCEPTION: main
04-29 14:56:29.711: ERROR/AndroidRuntime(430): java.lang.RuntimeException: Unable to
start activity
ComponentInfo{ImageViewExample.ImageViewExample/ImageViewExample.
ImageViewExample.ImageViewExample}: java.lang.NullPointerException
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.os.Handler.dispatchMessage(Handler.java:99)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.os.Looper.loop(Looper.java:123)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread.main(ActivityThread.java:4627)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
java.lang.reflect.Method.invokeNative(Native Method)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
java.lang.reflect.Method.invoke(Method.java:521)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
dalvik.system.NativeStart.main(Native Method)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): Caused by:
java.lang.NullPointerException
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
ImageViewExample.ImageViewExample.ImageViewExample$ImAdapterh.<init>
(ImageViewExample.java:73)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
ImageViewExample.ImageViewExample.ImageViewExample.init_phone_image_grid
(ImageViewExample.java:47)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
ImageViewExample.ImageViewExample.ImageViewExample.onCreate
(ImageViewExample.java:36)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): at
android.app.ActivityThread.performLaunchActivity
(ActivityThread.java:2627)
04-29 14:56:29.711: ERROR/AndroidRuntime(430): ... 11 more
04-29 14:56:29.751: WARN/ActivityManager(66): Force finishing activity
ImageViewExample.ImageViewExample/.ImageViewExample
04-29 14:56:30.292: WARN/ActivityManager(66): Activity pause timeout for
HistoryRecord{4406aab0 ImageViewExample.ImageViewExample/.ImageViewExample}
04-29 14:56:36.701: DEBUG/dalvikvm(189): GC_EXPLICIT freed 162 objects/7136 bytes in
121ms
04-29 14:56:41.568: WARN/ActivityManager(66): Activity destroy timeout for
HistoryRecord{4406aab0 ImageViewExample.ImageViewExample/.ImageViewExample}
請幫我.....