【发布时间】：2014-04-25 14:11:03
【问题描述】：
我正在创建应用程序，其中 1.从相机拍照。 2.将其URI保存在数据库中 3.使用光标和适配器检索图像 uri 并在网格视图中设置。
我收到错误“打开跟踪文件时出错：没有这样的文件或目录 (2)” 我也看不到任何名称为“我的图像”的文件夹
主要活动
public class MainActivity extends ActionBarActivity {
private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
final int MEDIA_TYPE_IMAGE=2;
Button click;
ImageView image;
Uri fileuri;
int camera_capture=100;
GridView gridactivity;
Gridsource source;
customiseadapter adapter;
ArrayList<String> List;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
source=new Gridsource(this);
source.open();
gridactivity=(GridView) findViewById(R.id.grid_view);
List=source.getallpath();
adapter=new customiseadapter(getApplicationContext(),List);
gridactivity.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.Add_button) {
captureimage();
}
return super.onOptionsItemSelected(item);
}
private void captureimage() {
if(cameraavail())
{
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileuri = getmediafileuri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT , fileuri);
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}
else
{
Toast.makeText(getApplicationContext(), "device with not camera support", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onActivityResult(int resultrequest, int resultcode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(resultrequest, resultcode, data);
if (resultrequest==CAMERA_CAPTURE_IMAGE_REQUEST_CODE) {
if (resultcode==RESULT_OK) {
source.createpicture(fileuri.toString());
ArrayList<String> list1 = source.getallpath();
customiseadapter adapter1= new customiseadapter(getApplicationContext(), list1);
gridactivity.setAdapter(adapter1);
}else if
(resultcode==RESULT_CANCELED)
{
Toast.makeText(getApplicationContext(),
"User cancelled image capture", Toast.LENGTH_SHORT)
.show();
}
}
}
private Uri getmediafileuri(int arg) {
File mediafile= getmediafile(arg);
return Uri.fromFile(mediafile) ;
}
private File getmediafile(int type){
File mediadir=new File(Environment.getExternalStorageDirectory()+"/myimages");
if(!mediadir.exists())
{
mediadir.mkdir();
}
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
Locale.getDefault()).format(new Date());
File mediafile;
if(type==MEDIA_TYPE_IMAGE )
{
mediafile= new File(mediadir.getPath() + File.separator + "img_" + timeStamp +".png" );
}else
{
return null;
}
return mediafile;
}
private boolean cameraavail() {
if(getApplicationContext().getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA))
return true;
else
return false;
}
}
2.mysqlitehelper
public class Mysqlitehelper extends SQLiteOpenHelper {
public static final String Table_grid ="gridtable";
public static final String column_ID ="ID";
public static final String column_URI ="URI";
public static final String DB_name = "Griddb";
public static final int version =1;
public static final String Database_create = "create table "+Table_grid+ " ("
+ column_ID +" integer primary key autoincrement,"
+ column_URI + " text not null);";
public Mysqlitehelper(Context context) {
super(context, DB_name, null, version);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(Database_create);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+ Table_grid);
onCreate(db);
}
}
3.customiseadapter
public class customiseadapter extends BaseAdapter {
Context context;
ArrayList<String> list;
public customiseadapter(Context context, ArrayList<String> list) {
super();
this.context = context;
this.list = list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return list.get(arg0);
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView image = new ImageView(context);
Uri uri = Uri.parse(list.get(arg0));
image.setImageURI(uri);
image.setScaleType(ImageView.ScaleType.CENTER_CROP);
image.setLayoutParams(new GridView.LayoutParams(70, 70));
return image;
}
}
-
网格源
public class Gridsource { Mysqlitehelper mydbhelper; SQLiteDatabase database; String[] column_name={Mysqlitehelper.column_ID,Mysqlitehelper.column_URI}; public Gridsource(Context context) { mydbhelper= new Mysqlitehelper(context); } public void open() { database=mydbhelper.getWritableDatabase(); } public void close() { mydbhelper.close(); } public void createpicture(String path) { ContentValues value= new ContentValues(); value.put(Mysqlitehelper.column_URI, path); database.insert(Mysqlitehelper.Table_grid, null, value); } public ArrayList<String>getallpath() { ArrayList<String> pathlist = new ArrayList<String>(); Cursor cursor = database.query(Mysqlitehelper.Table_grid, column_name, null, null, null, null, null, null); if(cursor.moveToFirst()) do{ String path = new String(); path=cursor.getString(1); pathlist.add(path); }while(cursor.moveToNext()); cursor.close(); return pathlist; } }
请帮我找到解决办法
【问题讨论】：
标签： android android-activity android-sqlite android-gridview android-file