如何设置根据数据库路径，存储在文件系统映像的看法？ [英] How can I set image view which stored in file system according to path in database?
问题描述
我有三个问题：
-
如果我选择存储
image.png在文件系统中我应该在哪里存放RES /绘制/ image_1.png或RES /绘制/图像/ image_1.png -
和我将存储在数据库中的图像的路径。我应该放在
image_path字段前。IMAGE_1或图片/ IMAGE_1或等。 -
我怎样才能获得的图像从数据库路径，并设置图片查看按照我的code在底部？难道你们改变了我？
我已经有答案
- 在的情况下存储在文件系统映像文件中的
资产/图像/ pic_1.png - 在数据库中，image_path场，你会把它
图片/ pic_1.png。 - 要获取和设置图像：根据微调的答案
和我照着裁剪的答案确定以下code。
非常感谢
placeListActivity.class
公共类placeListActivity扩展ListActivity {
私有静态的MyDB mDbHelper;
的String []从=新的String [] {Constants.COL_TITLE};
INT []到=新INT [] {R.id.list_place_title};
私人光标C;
@覆盖
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
mDbHelper =新的MyDB（本）;
mDbHelper.createDatabase（）;
mDbHelper.open（）;
C = mDbHelper.getAllPlaces（）;
setListAdapter（新SimpleCursorAdapter（这一点，
R.layout.list_place，C，
从到））;
最终的ListView LV = getListView（）;
lv.setOnItemClickListener（新OnItemClickListener（）{
公共无效onItemClick（适配器视图＆LT;＆GT;母公司视图中查看，INT位置，长的id）{
意图I =新的意图（view.getContext（），Place.class）;
i.putExtra（Constants.KEY_ID，ID）;
i.putExtra（Constants.COL_TITLE，c.getString（
c.getColumnIndexOrThrow（Constants.COL_TITLE）））;
i.putExtra（Constants.COL_CONTENT，c.getString（
c.getColumnIndexOrThrow（Constants.COL_CONTENT）））;
i.putExtra（Constants.COL_IMAGE，c.getString（
c.getColumnIndexOrThrow（Constants.COL_IMAGE）））;
startActivity（ⅰ）;
}
}）;
}
}
Place.class
公共类将延伸活动{
私人TextView的称号;
私人TextView的内容;
私人ImageView的placeImage;
公共无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
this.setContentView（R.layout.detail_place）;
标题=（TextView中）findViewById（R.id.place_title）;
内容=（TextView中）findViewById（R.id.place_content）;
placeImage =（ImageView的）findViewById（R.id.place_image）;
捆绑额外= getIntent（）getExtras（）。
如果（临时演员！= NULL）{
//参考XML定义的意见，我们将触摸code
字符串stringTitle = extras.getString（Constants.COL_TITLE）;
字符串的StringContent = extras.getString（Constants.COL_CONTENT）;
字符串imageID = extras.getString（Constants.COL_IMAGE）;
如果（标题！= NULL）{
title.setText（stringTitle）;
}
如果（内容！= NULL）{
content.setText（的StringContent）;
}
/ *如果（placeImage！= NULL）{
placeImage.setImageDrawable（Drawable.createFromPath（imageID））;
} * /
如果（placeImage！= NULL）{
尝试 {
InputStream的路径= getAssets（）开（的ImagePath）。
位图位= BitmapFactory.de codeStream（路径）;
placeImage.setImageBitmap（位）;
}赶上（IOException异常E）{
// TODO自动生成的catch块
e.printStackTrace（）;
}
}
}
}
}
您可以把你的图片在的资产/图像目录。在这种情况下，您将在 getAssets（）。打开（字符串路径）会像图像/ pic_1.png。
您可以拨打 getAssets（）在活动的任何地方。
还有一个 setImageBitmap（位图BM）方法。
您可以通过 BitmapFactory.de codeFILE创建路径位图（字符串路径）。
I have three questions:
If I choose to store
image.pngin file system where should I store itres/drawable/image_1.pngorres/drawable/images/image_1.pngAnd I'm going to store path of image in database. What should I put in
image_pathfield ex.image_1orimages/image_1or etc.How can I get path of image from database and set image to view follow my code in the bottom? Could you guys change it for me?
I already have answer
- in case storing image file in file system in
assets/images/pic_1.png - In database, "image_path field" , you will put
images/pic_1.pngin it. - To get and set image: according to Trim's answer.
AND I have fixed the following code according to Trim's answer.
Thanks so much
placeListActivity.class
public class placeListActivity extends ListActivity {
private static MyDB mDbHelper;
String[] from = new String[] { Constants.COL_TITLE};
int[] to = new int[] {R.id.list_place_title};
private Cursor c;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new MyDB(this);
mDbHelper.createDatabase();
mDbHelper.open();
c = mDbHelper.getAllPlaces();
setListAdapter(new SimpleCursorAdapter(this,
R.layout.list_place, c,
from, to));
final ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent i = new Intent(view.getContext(), Place.class);
i.putExtra(Constants.KEY_ID, id);
i.putExtra(Constants.COL_TITLE, c.getString(
c.getColumnIndexOrThrow(Constants.COL_TITLE)));
i.putExtra(Constants.COL_CONTENT, c.getString(
c.getColumnIndexOrThrow(Constants.COL_CONTENT)));
i.putExtra(Constants.COL_IMAGE, c.getString(
c.getColumnIndexOrThrow(Constants.COL_IMAGE)));
startActivity(i);
}
});
}
}
Place.class
public class Place extends Activity {
private TextView title;
private TextView content;
private ImageView placeImage;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.detail_place);
title = (TextView) findViewById(R.id.place_title);
content = (TextView) findViewById(R.id.place_content);
placeImage = (ImageView) findViewById(R.id.place_image);
Bundle extras = getIntent().getExtras();
if (extras != null) {
// reference XML defined views that we will touch in code
String stringTitle = extras.getString(Constants.COL_TITLE);
String stringContent = extras.getString(Constants.COL_CONTENT);
String imageID = extras.getString(Constants.COL_IMAGE);
if (title != null) {
title.setText(stringTitle);
}
if (content != null) {
content.setText(stringContent);
}
/*if (placeImage != null) {
placeImage.setImageDrawable(Drawable.createFromPath(imageID));
}*/
if (placeImage != null) {
try {
InputStream path = getAssets().open(imagePath);
Bitmap bit = BitmapFactory.decodeStream(path);
placeImage.setImageBitmap(bit);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
You can put your images under "assets/images" directory. In this case, the path that you will use in getAssets().open(String path) will be like "images/pic_1.png".
You can call getAssets() anywhere in your activity.
There is also a setImageBitmap(Bitmap bm) method.
You can create bitmap from path via BitmapFactory.decodeFile(String path).
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