public class MainActivity extends Activity implements LoaderCallbacks<Cursor>{
private ListView listView=null;
private Uri uri=null;
private ContentResolver resolver=null;
private CursorLoader cursorLoader=null;
private String[] projection = new String[]{MediaStore.Images.Media._ID,MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
private SimpleCursorAdapter cursorAdapter=null;
private long[] ids = null;
private LoaderManager loaderManager=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
//获取媒体图片的uri
uri=MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
resolver= getContentResolver();
cursorLoader = new CursorLoader(this, uri, projection, null, null, null);
cursorAdapter= new SimpleCursorAdapter(this, R.layout.item,null, projection, new int[]{R.id.textView_id,R.id.textView_name}, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
listView.setAdapter(cursorAdapter);
//获取得到所有的条目的id
ids=listView.getCheckedItemIds();
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ids = listView.getCheckedItemIds();
TextView textView_id = (TextView) view.findViewById(R.id.textView_id);
TextView textView_name = (TextView) view.findViewById(R.id.textView_name);
boolean flg = false;
for (int i = 0; i < ids.length; i++) {
if (id==ids[i]) {
textView_id.setTextColor((Color.BLUE));
textView_name.setTextColor(Color.BLUE);
flg=true;
}
}
if (!flg) {
textView_id.setTextColor((Color.BLACK));
textView_name.setTextColor(Color.BLACK);
}
}
});
loaderManager = getLoaderManager();
loaderManager.initLoader(2, null, this);
}
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// TODO Auto-generated method stub
return cursorLoader;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// TODO Auto-generated method stub
cursorAdapter.swapCursor(data);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// TODO Auto-generated method stub
cursorAdapter.swapCursor(null);
}
}
