如何从我的自定义库中删除图像，然后刷新图库 [英] How to delete image from my Custom gallery and then Refresh the gallery
本文介绍了如何从我的自定义库中删除图像，然后刷新图库的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
其实我已经做了自定义库。所有的图像显示在我的自定义库。但这里是一个问题。当使用删除按钮删除图像，图像文件从存储器中删除，但仍显示图像（我的意思缩略图剩余）。如何清除数据，并立即刷新画廊。
下面是我的code以下
MainActivity.java
公共类MainActivity延伸活动{
私人诠释计数;
私人位图[]的缩略图;
私人布尔[] thumbnailsselection;
私有String [] arrPath;
私人ImageAdapter imageAdapter;
文件file = NULL;
/ **当第一次创建活动调用。 * /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）; 显示（）; 最终按钮selectBtn =（按钮）findViewById（R.id.selectBtn）;
最终按钮shareBtn =（按钮）findViewById（R.id.btnShare）;
//删除图像。
selectBtn.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）
{
最终诠释LEN = thumbnailsselection.length;
INT CNT = 0; 串selectImages =;
的for（int i = 0; I＆LT; LEN，我++）
{
如果（thumbnailsselection [I]）
{
CNT ++;
selectImages = selectImages + arrPath [I] +|;
文件=新的文件（arrPath [I]）;
如果（file.exists（））
{
file.delete（）;
Log.v（罗尼，selectImages）;
// arrPath [我] = NULL;
// selectImages = NULL;
Log.v（罗尼，arrPath [I]）;
}
} }
如果（CNT == 0）{
Toast.makeText（getApplicationContext（），
请至少选择一个形象，
Toast.LENGTH_LONG）.show（）;
}其他
{
//缩略图= NULL; 显示（）;
Toast.makeText（getApplicationContext（），CNT +图像删除，Toast.LENGTH_LONG）.show（）;
Log.v（SelectedImages，selectImages）; } }
}）; //份额的形象。
shareBtn.setOnClickListener（新OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{
// TODO自动生成方法存根
INT ID = v.getId（）;
意图shareIntent =新的Intent（）;
shareIntent.setAction（Intent.ACTION_SEND_MULTIPLE）; 最终诠释LEN = thumbnailsselection.length;
INT CNT = 0;
ArrayList的＆LT;＆乌里GT; imageUris =新的ArrayList＆LT;＆乌里GT;（）;
URI路径= NULL;
串selectImages =;
的for（int i = 0; I＆LT; LEN，我++）
{
如果（thumbnailsselection [I]）
{
CNT ++;
selectImages = selectImages + arrPath [I] +|;
Log.v（罗尼，selectImages）;
PATH = Uri.parse（arrPath [I]）;
imageUris.add（路径）; }
}
如果（CNT == 0）{
Toast.makeText（getApplicationContext（），
请至少选择一个形象，
Toast.LENGTH_LONG）.show（）;
}其他
{ Log.v（罗尼，selectImages）; Toast.makeText（getApplicationContext（），CNT +图像共享，Toast.LENGTH_SHORT）.show（）;
Log.d（SelectedImages，selectImages）; } shareIntent.putParcelableArrayListExtra（Intent.EXTRA_STREAM，imageUris）;
shareIntent.setType（图像/ *）;
startActivity（Intent.createChooser（shareIntent，分享图像..））; startActivity（shareIntent）;
}
}）; 显示（）;
}
公共无效显示（）{ //存储的数据
最终的String [] =列{MediaStore.Images.Media.DATA，MediaStore.Images.Media._ID};
最后弦乐ORDERBY = MediaStore.Images.Media._ID;
光标imagecursor = managedQuery（MediaStore.Images.Media.EXTERNAL_CONTENT_URI，列，NULL，NULL，排序依据）; INT image_column_index = imagecursor.getColumnIndex（MediaStore.Images.Media._ID）; this.count = imagecursor.getCount（）;
this.thumbnails =新的位图[this.count] this.arrPath =新的String [this.count] this.thumbnailsselection =新的布尔[this.count]
//移动图像
的for（int i = 0; I＆LT; this.count;我++）{
imagecursor.moveToPosition（ⅰ）;
INT ID = imagecursor.getInt（image_column_index）;
INT dataColumnIndex = imagecursor.getColumnIndex（MediaStore.Images.Media.DATA）;
缩略图[I] = MediaStore.Images.Thumbnails.getThumbnail（getApplicationContext（）。getContentResolver（），身份证，
MediaStore.Images.Thumbnails.MINI_KIND，NULL）;
arrPath [I] = imagecursor.getString（dataColumnIndex）;
}
GridView控件imagegrid =（GridView控件）findViewById（R.id.PhoneImageGrid）;
imageAdapter =新ImageAdapter（）; imagegrid.setAdapter（imageAdapter）; imagecursor.close（）;
}公共类ImageAdapter延伸BaseAdapter {
私人LayoutInflater mInflater; 公共ImageAdapter（）{
mInflater =（LayoutInflater）getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
} 公众诠释的getCount（）{
返回计数;
} 公共对象的getItem（INT位置）{
返回的位置;
} 众长getItemId（INT位置）{
返回的位置;
} 公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
ViewHolder持有人;
如果（convertView == NULL）{
持有人=新ViewHolder（）;
convertView = mInflater.inflate（R.layout.galleryitem，NULL）; holder.imageview =（ImageView的）convertView.findViewById（R.id.thumbImage）; holder.checkbox =（复选框）convertView.findViewById（R.id.itemCheckBox）; convertView.setTag（保持器）;
}
其他{
支架=（ViewHolder）convertView.getTag（）;
}
holder.checkbox.setId（位置）;
holder.imageview.setId（位置）;
holder.checkbox.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ 复选框CB =（复选框）V;
INT ID = cb.getId（）;
如果（thumbnailsselection [ID]）{
cb.setChecked（假）;
thumbnailsselection [ID] = FALSE;
}其他{
cb.setChecked（真）;
thumbnailsselection [ID] =真;
}
}
}）;
holder.imageview.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ INT ID = v.getId（）;
/ *意向意图=新的Intent（）;
intent.setAction（Intent.ACTION_VIEW）;
intent.setDataAndType（Uri.parse（文件：//+ arrPath [ID]），图像/ *）;
startActivity（意向）;
* / 意向意图= getIntent（）;
乌里数据= intent.getData（）;
//检查如果数据类型是图片
如果（intent.getType（）的indexOf（图像/）== ID）
{
//imageview.setImageURI(data）;
ImageView的IMGE =（ImageView的）findViewById（R.id.result）;
imge.setImageURI（数据）;
}
}
}）;
holder.imageview.setImageBitmap（缩略图[位置]）;
holder.checkbox.setChecked（thumbnailsselection [位置]）;
holder.id =位置;
返回convertView;
}
}
类ViewHolder {
ImageView的ImageView的;
复选框复选框;
INT ID;
}}
Android清单
＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;清单的xmlns：机器人=http://schemas.android.com/apk/res/android
包=com.example.mygallary
安卓版code =1
机器人：=的versionName1.0＆GT;＆LT;用途-SDK
安卓的minSdkVersion =8
机器人：targetSdkVersion =21/＆GT;＆LT;使用许可权的android：NAME =android.permission.WRITE_EXTERNAL_STORAGE/＆GT;＆lt;应用
机器人：allowBackup =真
机器人：图标=@绘制/ ic_launcher
机器人：标签=@字符串/ APP_NAME
机器人：主题=@风格/ AppTheme
机器人：configChanges =方向| keyboardHidden＆GT;
＆LT;活动
机器人：名字=。MainActivity
机器人：标签=@字符串/ APP_NAME＆GT;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT; ＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
＆lt;数据机器人：mime类型=图像/ */＆GT;
＆所述; /意图滤光器＆gt; ＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT;
＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
＆所述; /意图滤光器＆gt; ＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.VIEW/＆GT; ＆LT;类机器人：名字=android.intent.category.DEFAULT/＆GT;
＆lt;数据机器人：mime类型=图像/ */＆GT;
＆所述; /意图滤光器＆gt;
＆所述;意图滤光器＆gt;
＆lt;作用机器人：名字=android.intent.action.SEND/＆GT; ＆lt;数据机器人：mime类型=图像/ */＆GT;
＆所述; /意图滤光器＆gt;
＆LT; /活性GT; ＆LT; /用途＆gt;
改变code后
公共类MainActivity延伸活动{
私人诠释计数;
私人位图[]的缩略图;
私人布尔[] thumbnailsselection;
私有String [] arrPath;
私人ImageAdapter imageAdapter;
文件file = NULL; / **当第一次创建活动调用。 * /
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.activity_main）; 显示（）; 最终按钮selectBtn =（按钮）findViewById（R.id.selectBtn）;
最终按钮shareBtn =（按钮）findViewById（R.id.btnShare）;
//删除图像。
selectBtn.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）
{
最终诠释LEN = thumbnailsselection.length;
INT CNT = 0; 串selectImages =;
的for（int i = 0; I＆LT; LEN，我++）
{
如果（thumbnailsselection [I]）
{
CNT ++;
selectImages = selectImages + arrPath [I] +|;
文件=新的文件（arrPath [I]）;
如果（file.exists（））
{
file.delete（）; imageAdapter.notifyDataSetChanged（）;
Log.v（罗尼，selectImages）;
// arrPath [我] = NULL;
// selectImages = NULL;
Log.v（罗尼，arrPath [I]）;
}
} }
如果（CNT == 0）{
Toast.makeText（getApplicationContext（），
请至少选择一个形象，
Toast.LENGTH_LONG）.show（）;
}其他
{
//缩略图= NULL;
imageAdapter.notifyDataSetChanged（）;
显示（）;
Toast.makeText（getApplicationContext（），CNT +图像删除，Toast.LENGTH_LONG）.show（）;
Log.v（SelectedImages，selectImages）; } }
}）; //份额的形象。
shareBtn.setOnClickListener（新OnClickListener（）{ @覆盖
公共无效的onClick（视图v）{
// TODO自动生成方法存根
INT ID = v.getId（）;
意图shareIntent =新的Intent（）;
shareIntent.setAction（Intent.ACTION_SEND_MULTIPLE）; 最终诠释LEN = thumbnailsselection.length;
INT CNT = 0;
ArrayList的＆LT;＆乌里GT; imageUris =新的ArrayList＆LT;＆乌里GT;（）;
URI路径= NULL;
串selectImages =;
的for（int i = 0; I＆LT; LEN，我++）
{
如果（thumbnailsselection [I]）
{
CNT ++;
selectImages = selectImages + arrPath [I] +|;
Log.v（罗尼，selectImages）;
PATH = Uri.parse（arrPath [I]）;
imageUris.add（路径）; }
}
如果（CNT == 0）{
Toast.makeText（getApplicationContext（），
请至少选择一个形象，
Toast.LENGTH_LONG）.show（）;
}其他
{ Log.v（罗尼，selectImages）; Toast.makeText（getApplicationContext（），CNT +图像共享，Toast.LENGTH_SHORT）.show（）;
Log.d（SelectedImages，selectImages）; } shareIntent.putParcelableArrayListExtra（Intent.EXTRA_STREAM，imageUris）;
shareIntent.setType（图像/ *）;
startActivity（Intent.createChooser（shareIntent，分享图像..））; startActivity（shareIntent）;
}
}）; 显示（）;
}
公共无效显示（）{ //存储的数据
最终的String [] =列{MediaStore.Images.Media.DATA，MediaStore.Images.Media._ID};
最后弦乐ORDERBY = MediaStore.Images.Media._ID;
光标imagecursor = managedQuery（MediaStore.Images.Media.EXTERNAL_CONTENT_URI，列，NULL，NULL，排序依据）; INT image_column_index = imagecursor.getColumnIndex（MediaStore.Images.Media._ID）; this.count = imagecursor.getCount（）;
this.thumbnails =新的位图[this.count] this.arrPath =新的String [this.count] this.thumbnailsselection =新的布尔[this.count]
//移动图像
的for（int i = 0; I＆LT; this.count;我++）{
imagecursor.moveToPosition（ⅰ）;
INT ID = imagecursor.getInt（image_column_index）;
INT dataColumnIndex = imagecursor.getColumnIndex（MediaStore.Images.Media.DATA）;
缩略图[I] = MediaStore.Images.Thumbnails.getThumbnail（getApplicationContext（）。getContentResolver（），身份证，
MediaStore.Images.Thumbnails.MINI_KIND，NULL）;
arrPath [I] = imagecursor.getString（dataColumnIndex）;
}
GridView控件imagegrid =（GridView控件）findViewById（R.id.PhoneImageGrid）;
imageAdapter =新ImageAdapter（）; imagegrid.setAdapter（imageAdapter）; imagecursor.close（）;
} 公共类ImageAdapter延伸BaseAdapter {
私人LayoutInflater mInflater; 公共ImageAdapter（）{
mInflater =（LayoutInflater）getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
} 公众诠释的getCount（）{
返回计数;
} 公共对象的getItem（INT位置）{
返回的位置;
} 众长getItemId（INT位置）{
返回的位置;
} 公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
ViewHolder持有人;
如果（convertView == NULL）{
持有人=新ViewHolder（）;
convertView = mInflater.inflate（R.layout.galleryitem，NULL）; holder.imageview =（ImageView的）convertView.findViewById（R.id.thumbImage）; holder.checkbox =（复选框）convertView.findViewById（R.id.itemCheckBox）; convertView.setTag（保持器）;
}
其他{
支架=（ViewHolder）convertView.getTag（）;
}
holder.checkbox.setId（位置）;
holder.imageview.setId（位置）;
holder.checkbox.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ 复选框CB =（复选框）V;
INT ID = cb.getId（）;
如果（thumbnailsselection [ID]）{
cb.setChecked（假）;
thumbnailsselection [ID] = FALSE;
}其他{
cb.setChecked（真）;
thumbnailsselection [ID] =真;
}
}
}）;
holder.imageview.setOnClickListener（新OnClickListener（）{ 公共无效的onClick（视图v）{ INT ID = v.getId（）;
/ *意向意图=新的Intent（）;
intent.setAction（Intent.ACTION_VIEW）;
intent.setDataAndType（Uri.parse（文件：//+ arrPath [ID]），图像/ *）;
startActivity（意向）;
* / / *意图意图= getIntent（）;
乌里数据= intent.getData（）;
//检查如果数据类型是图片
如果（intent.getType（）的indexOf（图像/）== ID）
{
//imageview.setImageURI(data）;
ImageView的IMGE =（ImageView的）findViewById（R.id.result）;
imge.setImageURI（数据）;
} * /
}
}）;
holder.imageview.setImageBitmap（缩略图[位置]）;
holder.checkbox.setChecked（thumbnailsselection [位置]）;
holder.id =位置;
返回convertView;
}
}
类ViewHolder {
ImageView的ImageView的;
复选框复选框;
INT ID;
}
}
解决方案
之前调用 notifyDataSetChanged（）; 你应该从缩略图<删除删除图像/ code>
你需要在你的自定义适配器方法，这样做
我不知道如何在删除一个项目位图[] 阵列。但如果你可以使用列表＆LT;＆位图GT; 而不是说，该方法将是这样的：
公共无效RemoveThumbnail（INT位置）
{
this.thumbnails.remove（位置）;
// notifyDataSetChanged（）可以在这个方法或之后调用
//调用MainActivity这种方法
notifyDataSetChanged（）;
}
，否则这是后话，在特定位置删除缩略图：
公共无效RemoveThumbnail（INT位置）
{
位图[] TEMP =新位图[thumbnails.length - 1];
INT tempIndex = 0;
的for（int i = 0; I＆LT; thumbnails.lenght;我++）
{
如果（我！=位置）
临时[tempIndex ++] =缩略图[I]
}
缩略图=温度;
// notifyDataSetChanged（）可以在这个方法或之后调用
//调用MainActivity这种方法
notifyDataSetChanged（）;
}
Actually I have made a Custom gallery. All the image are shown in my Custom gallery. But here is a problem. When delete the image using delete button, image files are deleted from the memory, but still show the image ( I mean thumbnails are remaining ) . how to clear the data and refresh the gallery instantly.
Here is my code below
MainActivity.java
public class MainActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
File file = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show();
final Button selectBtn = (Button) findViewById(R.id.selectBtn);
final Button shareBtn = (Button) findViewById(R.id.btnShare);
//delete image.
selectBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
final int len = thumbnailsselection.length;
int cnt = 0;
String selectImages = "";
for (int i =0; i<len; i++)
{
if (thumbnailsselection[i])
{
cnt++;
selectImages = selectImages + arrPath[i] +" | ";
file= new File(arrPath[i]);
if(file.exists())
{
file.delete();
Log.v("roni", selectImages);
//arrPath[i] = null;
//selectImages = null;
Log.v("roni", arrPath[i]);
}
}
}
if (cnt == 0){
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else
{
//thumbnails= null;
show();
Toast.makeText(getApplicationContext(),cnt +" Images Deleted ",Toast.LENGTH_LONG).show();
Log.v("SelectedImages", selectImages);
}
}
});
//share image.
shareBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE);
final int len = thumbnailsselection.length;
int cnt = 0;
ArrayList<Uri> imageUris = new ArrayList<Uri>();
Uri path= null;
String selectImages = "";
for (int i =0; i<len; i++)
{
if (thumbnailsselection[i])
{
cnt++;
selectImages = selectImages + arrPath[i] +" | ";
Log.v("roni", selectImages);
path = Uri.parse(arrPath[i]);
imageUris.add(path);
}
}
if (cnt == 0){
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else
{
Log.v("roni", selectImages);
Toast.makeText(getApplicationContext(),cnt +" Images shared ",Toast.LENGTH_SHORT).show();
Log.d("SelectedImages", selectImages);
}
shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, imageUris);
shareIntent.setType("image/*");
startActivity(Intent.createChooser(shareIntent, "Share images to.."));
startActivity(shareIntent);
}
});
show();
}
public void show() {
//stored data
final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy);
int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
this.count = imagecursor.getCount();
this.thumbnails = new Bitmap[this.count];
this.arrPath = new String[this.count];
this.thumbnailsselection = new boolean[this.count];
//move image
for (int i = 0; i < this.count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
arrPath[i]= imagecursor.getString(dataColumnIndex);
}
GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
imagecursor.close();
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.checkbox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
int id = cb.getId();
if (thumbnailsselection[id]){
cb.setChecked(false);
thumbnailsselection[id] = false;
} else {
cb.setChecked(true);
thumbnailsselection[id] = true;
}
}
});
holder.imageview.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
int id = v.getId();
/*Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + arrPath[id]), "image/*");
startActivity(intent);
*/
Intent intent = getIntent();
Uri data = intent.getData();
//Check If data type is Image
if (intent.getType().indexOf("image/") == id)
{
//imageview.setImageURI(data);
ImageView imge = (ImageView)findViewById(R.id.result);
imge.setImageURI(data);
}
}
});
holder.imageview.setImageBitmap(thumbnails[position]);
holder.checkbox.setChecked(thumbnailsselection[position]);
holder.id = position;
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox;
int id;
} }
Android Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mygallary"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:configChanges="orientation|keyboardHidden" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<data android:mimeType="image/*" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="image/*" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEND" />
<data android:mimeType="image/*" />
</intent-filter>
</activity>
</application>
After changing the code
public class MainActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
File file = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
show();
final Button selectBtn = (Button) findViewById(R.id.selectBtn);
final Button shareBtn = (Button) findViewById(R.id.btnShare);
//delete image.
selectBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
final int len = thumbnailsselection.length;
int cnt = 0;
String selectImages = "";
for (int i =0; i<len; i++)
{
if (thumbnailsselection[i])
{
cnt++;
selectImages = selectImages + arrPath[i] +" | ";
file= new File(arrPath[i]);
if(file.exists())
{
file.delete();
imageAdapter.notifyDataSetChanged();
Log.v("roni", selectImages);
//arrPath[i] = null;
//selectImages = null;
Log.v("roni", arrPath[i]);
}
}
}
if (cnt == 0){
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else
{
//thumbnails= null;
imageAdapter.notifyDataSetChanged();
show();
Toast.makeText(getApplicationContext(),cnt +" Images Deleted ",Toast.LENGTH_LONG).show();
Log.v("SelectedImages", selectImages);
}
}
});
//share image.
shareBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int id = v.getId();
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE);
final int len = thumbnailsselection.length;
int cnt = 0;
ArrayList<Uri> imageUris = new ArrayList<Uri>();
Uri path= null;
String selectImages = "";
for (int i =0; i<len; i++)
{
if (thumbnailsselection[i])
{
cnt++;
selectImages = selectImages + arrPath[i] +" | ";
Log.v("roni", selectImages);
path = Uri.parse(arrPath[i]);
imageUris.add(path);
}
}
if (cnt == 0){
Toast.makeText(getApplicationContext(),
"Please select at least one image",
Toast.LENGTH_LONG).show();
} else
{
Log.v("roni", selectImages);
Toast.makeText(getApplicationContext(),cnt +" Images shared ",Toast.LENGTH_SHORT).show();
Log.d("SelectedImages", selectImages);
}
shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, imageUris);
shareIntent.setType("image/*");
startActivity(Intent.createChooser(shareIntent, "Share images to.."));
startActivity(shareIntent);
}
});
show();
}
public void show() {
//stored data
final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, columns, null, null, orderBy);
int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
this.count = imagecursor.getCount();
this.thumbnails = new Bitmap[this.count];
this.arrPath = new String[this.count];
this.thumbnailsselection = new boolean[this.count];
//move image
for (int i = 0; i < this.count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(getApplicationContext().getContentResolver(), id,
MediaStore.Images.Thumbnails.MINI_KIND, null);
arrPath[i]= imagecursor.getString(dataColumnIndex);
}
GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
imagecursor.close();
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
holder.checkbox = (CheckBox) convertView.findViewById(R.id.itemCheckBox);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
holder.checkbox.setId(position);
holder.imageview.setId(position);
holder.checkbox.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
int id = cb.getId();
if (thumbnailsselection[id]){
cb.setChecked(false);
thumbnailsselection[id] = false;
} else {
cb.setChecked(true);
thumbnailsselection[id] = true;
}
}
});
holder.imageview.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
int id = v.getId();
/*Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse("file://" + arrPath[id]), "image/*");
startActivity(intent);
*/
/*Intent intent = getIntent();
Uri data = intent.getData();
//Check If data type is Image
if (intent.getType().indexOf("image/") == id)
{
//imageview.setImageURI(data);
ImageView imge = (ImageView)findViewById(R.id.result);
imge.setImageURI(data);
}*/
}
});
holder.imageview.setImageBitmap(thumbnails[position]);
holder.checkbox.setChecked(thumbnailsselection[position]);
holder.id = position;
return convertView;
}
}
class ViewHolder {
ImageView imageview;
CheckBox checkbox;
int id;
}
}
解决方案
before calling notifyDataSetChanged(); You should remove Deleted image from thumbnails
Bitmap[] array. but if you can use List<Bitmap> instead of that, the method will be like this :public void RemoveThumbnail(int position)
{
this.thumbnails.remove(position);
//notifyDataSetChanged() can be called in this method or after
//calling this method in MainActivity
notifyDataSetChanged();
}
otherwise this is something that removes thumbnail in specific position :
public void RemoveThumbnail(int position)
{
Bitmap[] temp = new Bitmap[thumbnails.length - 1];
int tempIndex = 0;
for (int i = 0 ; i < thumbnails.lenght ; i++)
{
if(i != position)
temp[tempIndex ++] = thumbnails[i];
}
thumbnails = temp;
//notifyDataSetChanged() can be called in this method or after
//calling this method in MainActivity
notifyDataSetChanged();
}
这篇关于如何从我的自定义库中删除图像，然后刷新图库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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