Question

我正在开发一个将数据保存到SQLite数据库的应用程序。我有一个多选择微调器的属性。

Selected items displayed in codes, separated by comma

我想将此保存到数据库中，但我不知道如何检索它，所以当我点击它时，它会显示在微调器中选择的项目。

有什么想法吗？感谢。

顺便说一句，我从这里获得了MultiChoice Spinner库：http://v4all123.blogspot.com/2013/09/spinner-with-multiple-selection-in.html

编辑：下面是我操作MultiSelectionSpinner类的代码：

package com.scbpfsdgis.femobilebetav20;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

import com.guna.libmultispinner.MultiSelectionSpinner;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Created by William on 1/27/2018.
 */

public class FieldDetailActivity extends AppCompatActivity implements MultiSelectionSpinner.OnMultipleItemsSelectedListener {

    Spinner spnMechMeth, spnTract;
    String limits = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_field_detail);

        String[] limits = getResources().getStringArray(R.array.limitations);
        List<String> limitList = new ArrayList<String>(Arrays.asList(limits));

        MultiSelectionSpinner mssLimits = (MultiSelectionSpinner) findViewById(R.id.spnMainLim);
        mssLimits.setItems(limitList);
        mssLimits.setListener(this);

        spnMechMeth = findViewById(R.id.spnMechMeth);
        spnTract = findViewById(R.id.spnTract);

        System.out.println("Selected Strings: " + mssCanals.getSelectedItemsAsString());

    }

    @Override
    public void selectedIndices(List<Integer> indices) {

    }

    @Override
    public void selectedStrings(List<String> strings) {
        Toast.makeText(this, strings.toString(), Toast.LENGTH_LONG).show();
        System.out.println("Toast " + strings.toString());
    }
}

MultiSelectionSpinner.java：

package com.guna.libmultispinner;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.util.AttributeSet;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

public class MultiSelectionSpinner extends Spinner implements
        OnMultiChoiceClickListener {

    public interface OnMultipleItemsSelectedListener{
        void selectedIndices(List<Integer> indices);
        void selectedStrings(List<String> strings);
    }
    private OnMultipleItemsSelectedListener listener;

    String[] _items = null;
    boolean[] mSelection = null;
    boolean[] mSelectionAtStart = null;
    String _itemsAtStart = null;
    ArrayAdapter<String> simple_adapter;
    String title = null;

    public MultiSelectionSpinner(Context context) {
        super(context);

        simple_adapter = new ArrayAdapter<>(context,
                android.R.layout.simple_spinner_item);
        super.setAdapter(simple_adapter);
    }

    public MultiSelectionSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);

        simple_adapter = new ArrayAdapter<>(context,
                android.R.layout.simple_spinner_item);
        super.setAdapter(simple_adapter);
    }

    public void setListener(OnMultipleItemsSelectedListener listener){
        this.listener = listener;
    }

    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
        if (mSelection != null && which < mSelection.length) {
            mSelection[which] = isChecked;
            simple_adapter.clear();
            if (buildSelectedItemString().length() == 0) {
                simple_adapter.add("- Limitations -");
            } else {
                simple_adapter.add(buildSelectedItemString());
                System.out.println("Selected String: " + buildSelectedItemString().length());
            }
        } else {
            throw new IllegalArgumentException(
                    "Argument 'which' is out of bounds.");
        }
    }

    @Override
    public boolean performClick() {
        AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
        builder.setTitle("Choose ...");
        builder.setMultiChoiceItems(_items, mSelection, this);
        _itemsAtStart = getSelectedItemsAsString();
        builder.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                System.arraycopy(mSelection, 0, mSelectionAtStart, 0, mSelection.length);
                listener.selectedIndices(getSelectedIndices());
                listener.selectedStrings(getSelectedStrings());
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                simple_adapter.clear();
                if (_itemsAtStart.toString().trim().length() == 0) {
                    simple_adapter.add("- Limitations -");
                } else {
                    simple_adapter.add(_itemsAtStart);
                }
                System.arraycopy(mSelectionAtStart, 0, mSelection, 0, mSelectionAtStart.length);
            }
        });
        builder.show();
        return true;
    }

    public String getBuilderTitle(String att) {
        if (att.equalsIgnoreCase("L")) {
            return "Choose Limitations...";
        } else {
            return "Canals...";
        }
    }

    @Override
    public void setAdapter(SpinnerAdapter adapter) {
        throw new RuntimeException(
                "setAdapter is not supported by MultiSelectSpinner.");
    }

    public void setItems(String[] items) {
        _items = items;
        mSelection = new boolean[_items.length];
        mSelectionAtStart = new boolean[_items.length];
        simple_adapter.clear();
        simple_adapter.add(_items[0]);
        Arrays.fill(mSelection, false);
        mSelection[0] = true;
        mSelectionAtStart[0] = true;
    }

    public void setItems(List<String> items) {
        _items = items.toArray(new String[items.size()]);
        mSelection = new boolean[_items.length];
        mSelectionAtStart  = new boolean[_items.length];
        simple_adapter.clear();
        simple_adapter.add(_items[0]);
        Arrays.fill(mSelection, false);
        mSelection[0] = false;
    }

    public void setSelection(String[] selection) {
        for (int i = 0; i < mSelection.length; i++) {
                mSelection[i] = false;
                mSelectionAtStart[i] = false;
        }
        for (String cell : selection) {
            for (int j = 0; j < _items.length; ++j) {
                if (_items[j].equals(cell)) {
                    mSelection[j] = true;
                    mSelectionAtStart[j] = true;
                }
            }
        }
        simple_adapter.clear();
        simple_adapter.add(buildSelectedItemString());
    }

    public void setSelection(List<String> selection) {
        for (int i = 0; i < mSelection.length; i++) {
            mSelection[i] = false;
            mSelectionAtStart[i] = false;
        }
        for (String sel : selection) {
            for (int j = 0; j < _items.length; ++j) {
                if (_items[j].equals(sel)) {
                    mSelection[j] = true;
                    mSelectionAtStart[j] = true;
                }
            }
        }
        simple_adapter.clear();
        simple_adapter.add(buildSelectedItemString());
    }

    public void setSelection(int index) {
        for (int i = 0; i < mSelection.length; i++) {
            mSelection[i] = false;
            mSelectionAtStart[i] = false;
        }
        if (index >= 0 && index < mSelection.length) {
            mSelection[index] = true;
            mSelectionAtStart[index] = true;
        } else {
            throw new IllegalArgumentException("Index " + index
                    + " is out of bounds.");
        }
        simple_adapter.clear();
        simple_adapter.add(buildSelectedItemString());
    }

    public void setSelection(int[] selectedIndices) {
        for (int i = 0; i < mSelection.length; i++) {
            mSelection[i] = false;
            mSelectionAtStart[i] = false;
        }
        for (int index : selectedIndices) {
            if (index >= 0 && index < mSelection.length) {
                mSelection[index] = true;
                mSelectionAtStart[index] = true;
            } else {
                throw new IllegalArgumentException("Index " + index
                        + " is out of bounds.");
            }
        }
        simple_adapter.clear();
        simple_adapter.add(buildSelectedItemString());
    }

    public List<String> getSelectedStrings() {
        List<String> selection = new LinkedList<>();
        for (int i = 0; i < _items.length; ++i) {
            if (mSelection[i]) {
                //Edit: Get only limit code.
                selection.add(_items[i].substring(_items[i].indexOf("(")+1, _items[i].indexOf(")")));
            }
        }
        return selection;
    }

    public List<Integer> getSelectedIndices() {
        List<Integer> selection = new LinkedList<>();
        for (int i = 0; i < _items.length; ++i) {
            if (mSelection[i]) {
                selection.add(i);
            }
        }
        return selection;
    }

    private String buildSelectedItemString() {
        StringBuilder sb = new StringBuilder();
        boolean foundOne = false;

        for (int i = 0; i < _items.length; ++i) {
            if (mSelection[i]) {
                if (foundOne) {
                    sb.append(", ");
                }
                foundOne = true;
                //Edit: Get only limit code
                sb.append(_items[i].substring(_items[i].indexOf("(")+1, _items[i].indexOf(")")));
            }
        }
        return sb.toString();
    }

    public String getSelectedItemsAsString() {
        StringBuilder sb = new StringBuilder();
        boolean foundOne = false;

        for (int i = 0; i < _items.length; ++i) {
            if (mSelection[i]) {
                if (foundOne) {
                    sb.append(", ");
                }
                foundOne = true;
                //Edit: Get only limit code
                sb.append(_items[i].substring(_items[i].indexOf("(")+1, _items[i].indexOf(")")));
            }
        }
        return sb.toString();
    }
}

Answer 1

使用LoaderManager回调。从这里获得一些帮助：

https://www.grokkingandroid.com/using-loaders-in-android/

使用SQLite中的数据填充MultiChoice Spinner

1 个答案: