android imageswitcher gallery 根据数据库内图片名字进行查看/删除
layout/imageswitch.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="fill_parent" > <ImageSwitcher android:id="@+id/arc_hf_img_switcher" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" /> <LinearLayout android:id="@+id/linearLayout1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:gravity="center" > <Gallery android:id="@+id/arc_hf_img_gallery" android:layout_width="fill_parent" android:layout_height="60dp" android:layout_weight="1" android:background="#55000000" android:gravity="center_vertical" android:spacing="16dp" /> <Button android:id="@+id/arc_hf_img_btnDel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="30dp" android:text="@string/arc_hf_img_btnDel" /> <Button android:id="@+id/arc_hf_img_btnBack" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="30dp" android:text="@string/arc_hf_img_btnBack" /> </LinearLayout> </RelativeLayout>
ImgSwitch.java
public class ImgSwitch extends Activity implements OnItemSelectedListener, ViewFactory { private final String DATABASE_PATH = Environment .getExternalStorageDirectory().getAbsolutePath() + "/hfdatabase"; private final String DATABASE_FILENAME = "hf_database.db"; private final String TABLE_NAME = "HF_IMG_THEME"; private final String strImgPath = Environment.getExternalStorageDirectory() .toString() + "/dlion/";// 存放照片的文件夹 private SQLiteDatabase db; private ImageSwitcher is; private Gallery gallery; private Bitmap[] bitmaps; private int[] _ids; private String[] imgNames; private int parentId; public int gPosition = 0; private int isPosition = 0; private Button btnDel; private Button btnBack; // 返回键监听，添加关闭数据库功能。 public void onBackPressed() { super.onBackPressed(); db.close(); finish(); } @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.imageswitch); db = openDatabase(); parentId = this.getIntent().getIntExtra("parentId", 0); gallery = (Gallery) findViewById(R.id.arc_hf_img_gallery); is = (ImageSwitcher) findViewById(R.id.arc_hf_img_switcher); is.setFactory(this); is.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); is.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); btnDel = (Button) findViewById(R.id.arc_hf_img_btnDel); btnBack = (Button) findViewById(R.id.arc_hf_img_btnBack); btnDel.setOnClickListener(new btnListener()); btnBack.setOnClickListener(new btnListener()); initImgs(); } // 按键监听 class btnListener implements OnClickListener { @Override public void onClick(View v) { // TODO Auto-generated method stub switch (v.getId()) { case R.id.arc_hf_img_btnBack: db.close(); finish(); break; case R.id.arc_hf_img_btnDel: db.delete(TABLE_NAME, "_id=" + _ids[gPosition], null); File file = new File(imgNames[gPosition]); file.delete(); Toast.makeText(ImgSwitch.this, imgNames[gPosition] + "删除成功", Toast.LENGTH_SHORT).show(); initImgs(); break; default: break; } } } // 初始化图片视图 private void initImgs() { Cursor cursorImgName = db.query(TABLE_NAME, null, "parentId = " + parentId, null, null, null, null); bitmaps = new Bitmap[cursorImgName.getCount()]; imgNames = new String[cursorImgName.getCount()]; _ids = new int[cursorImgName.getCount()]; // 优化内存 BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 20; for (int i = 0; i < cursorImgName.getCount(); i++) { cursorImgName.moveToNext(); // 保存图片组名字、ID、完整路径 imgNames[i] = strImgPath + cursorImgName.getString(cursorImgName .getColumnIndex("imgName")); _ids[i] = cursorImgName.getInt(cursorImgName.getColumnIndex("_id")); bitmaps[i] = BitmapFactory.decodeFile(imgNames[i], options); } gallery.setAdapter(new ImageAdapter(this)); gallery.setOnItemSelectedListener(this); if (gPosition == cursorImgName.getCount() && cursorImgName.getCount() >= 1) { is.setImageURI(Uri.parse(imgNames[isPosition - 1])); } else if (cursorImgName.getCount() == 0) { // 没有图片时，取消删除键监听 btnDel.setEnabled(false); } } @Override public View makeView() { // TODO Auto-generated method stub ImageView i = new ImageView(this); i.setBackgroundColor(0xFF000000); i.setScaleType(ImageView.ScaleType.FIT_CENTER); i.setLayoutParams(new ImageSwitcher.LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return i; } // 覆写baseadapter类 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context c) { mContext = c; } @Override public int getCount() { // TODO Auto-generated method stub return bitmaps.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 View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub gPosition = position; ImageView i = new ImageView(mContext); i.setImageBitmap(bitmaps[position]); i.setAdjustViewBounds(true); i.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return i; } } @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub isPosition = arg2; is.setImageURI(Uri.parse(imgNames[arg2])); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } // 初始化数据库 private SQLiteDatabase openDatabase() { try { String databaseFilename = DATABASE_PATH + "/" + DATABASE_FILENAME; File dir = new File(DATABASE_PATH); if (!dir.exists()) dir.mkdir(); if (!(new File(databaseFilename)).exists()) { InputStream is = getResources().openRawResource( R.raw.hf_database); FileOutputStream fos = new FileOutputStream(databaseFilename); byte[] buffer = new byte[8192]; int count = 0; // 开始复制hf_database.db文件 while ((count = is.read(buffer)) > 0) { fos.write(buffer, 0, count); } } db = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null); return db; } catch (Exception e) { e.printStackTrace(); } return null; } }
