Android使用TableLayou动态布局实例
openkk
13年前
实现主要功能:
* 1.使用TableLayout动态布局展示,可动态添加和删除.
* 2.初始化时显示动态展示,初始化的数据改造后可来自数据库.
* 3.重置时到初始化状态.
* 4.保存时去重检查,参见代码中去重算法.
首先,建立实体类:
package tgb.lk.tablelayout; public class Dict { private int id; private String name; private int orders; private String desc; private int types; //get,set方法. @Override public String toString() { return "Dict [id=" + id + ", name=" + name + ", orders=" + orders + ", types=" + types + "]"; } } 其次,建立数据层方法接口:
package tgb.lk.tablelayout; import java.util.ArrayList; import java.util.List; import android.content.Context; public class DictDaoImpl { public DictDaoImpl(Context context) { } public boolean isExist() { return false; } public List<Dict> getDictItem(String dictId) { String[] dicts = new String[] { "华东", "华南", "华北", "华中", "西南", "东北" }; List<Dict> retList = new ArrayList<Dict>(); for (int j = 0; j < dicts.length; j++) { Dict dict = new Dict(); dict.setName(dicts[j]); dict.setId(j); dict.setOrders(j); dict.setTypes(1000); retList.add(dict); } return retList; } public long insert(Dict entity) { return 1L; } public void delete(int id) { } public void update(Dict entity) { } public Dict get(Object id) { Dict dict = new Dict(); dict.setId(1); dict.setName("华东"); dict.setOrders(1); dict.setTypes(1000); return dict; } public void delete(Integer... ids) { } } 然后,建立layout布局dict_item.xml:<?xml version="1.0" encoding="utf-8"?> <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="none" > <LinearLayout android:id="@+id/dictLayout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:scrollbars="" > <TextView android:id="@+id/title" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="业务字典管理" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="80dp" android:layout_height="wrap_content" android:text="名称:" /> <EditText android:id="@+id/name" android:layout_width="200dp" android:layout_height="wrap_content" android:hint="请输入业务字典名称" android:maxLength="20" android:singleLine="true" /> </LinearLayout> <TableLayout android:id="@+id/dictTable" android:layout_width="fill_parent" android:layout_height="wrap_content" android:stretchColumns="1" > <TableRow > <TextView android:layout_width="60dp" android:layout_gravity="left" android:padding="3dip" android:text="序号" android:textStyle="bold" /> <TextView android:layout_gravity="center" android:padding="3dip" android:text="字典名称" android:textStyle="bold" /> <TextView android:layout_gravity="right" android:padding="3dip" android:text=" 操作 " android:textStyle="bold" /> </TableRow> </TableLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="right" android:orientation="horizontal" > <Button android:id="@+id/btnCancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:text=" 关 闭 " /> <Button android:id="@+id/btnReset" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:text=" 重 置 " /> <Button android:id="@+id/btnAdd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:text=" 添 加 " /> <Button android:id="@+id/btnOK" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="8dp" android:text=" 保 存 " /> </LinearLayout> </LinearLayout> </ScrollView>
最后,建立逻辑主类:
package tgb.lk.tablelayout; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.text.TextUtils; import android.view.Gravity; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TableLayout; import android.widget.TableRow; import android.widget.TextView; import android.widget.Toast; /** * 实现功能: * 1.使用TableLayout动态布局展示,可动态添加和删除. * 2.初始化时显示动态展示,初始化的数据改造后可来自数据库. * 3.重置时到初始化状态. * 4.保存时去重检查,参见代码中去重算法. * * @author likun date: 2012-04-07 */ public class MainActivity extends Activity { private Button btnAdd = null; private Button btnOK = null; private Button btnReset = null; private Button btnCancel = null; private EditText nameET = null; private int entity_id = 0; private String entity_name = ""; private DictDaoImpl dao = null; private TableLayout table = null; private int orders = 0; // 用户记录最大的orders值 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.dict_item); // 实例化按钮并设置监听器. btnAdd = (Button) findViewById(R.id.btnAdd); btnOK = (Button) findViewById(R.id.btnOK); btnReset = (Button) findViewById(R.id.btnReset); btnCancel = (Button) findViewById(R.id.btnCancel); btnAdd.setOnClickListener(listener); btnOK.setOnClickListener(listener); btnReset.setOnClickListener(listener); btnCancel.setOnClickListener(listener); // 实例化EditText nameET = (EditText) findViewById(R.id.name); // Intent intent = getIntent(); entity_id = 1; // intent.getIntExtra(CrmConstances.ID, 0); entity_name = "区域";// intent.getStringExtra(CrmConstances.NAME); nameET.setText(entity_name); table = (TableLayout) findViewById(R.id.dictTable); initDictItemTable(); } OnClickListener listener = new OnClickListener() { @Override public void onClick(View v) { switch (v.getId()) { case R.id.btnAdd: appendNewRow(table); break; case R.id.btnOK: // 组名称不能为空. if (TextUtils.isEmpty(nameET.getText().toString().trim())) { toastShow("名称不能为空,操作失败!"); nameET.requestFocus(); // 设定焦点 break; } if (dao == null) { dao = new DictDaoImpl(MainActivity.this); } String entityNameET = nameET.getText().toString().trim(); if (entity_id != 0) { Dict entity = dao.get(entity_id); // 组名发生改变时,判断组名称是否重复 if (!entity.getName().equals(entityNameET)) { if (dao.isExist()) { toastShow("名称[" + entityNameET + "]重复,操作失败!"); nameET.selectAll(); nameET.requestFocus(); break; } entity.setName(entityNameET); dao.update(entity); } Map<String, Dict> dictMap = new HashMap<String, Dict>(); List<Dict> dictAddList = new ArrayList<Dict>(); List<Dict> dictUpdateList = new ArrayList<Dict>(); List<Dict> dictDeleteList = new ArrayList<Dict>(); Map<String, String> map = new HashMap<String, String>(); // 从界面得到业务字典对象 for (int i = 1; i < table.getChildCount(); i++) { // 得到TableRow对象 TableRow row = (TableRow) table.getChildAt(i); String dictId = ((TextView) row.getChildAt(0)) .getText().toString(); String dictOrders = ((EditText) row.getChildAt(1)) .getText().toString(); String dictName = ((EditText) row.getChildAt(2)) .getText().toString(); // 构建Dict对象 Dict dict = new Dict(); if (!TextUtils.isEmpty(dictName)) { dict.setName(dictName); // 检查名称是否重复. if (map.containsKey(dictName)) { toastShow("名称重复,请检查,保存失败!"); return; } map.put(dictName, dictName); if (!TextUtils.isEmpty(dictOrders)) { dict.setOrders(Integer.parseInt(dictOrders)); } else { dict.setOrders(orders); } if (!TextUtils.isEmpty(dictId)) { dict.setId(Integer.parseInt(dictId)); dictMap.put(dictId, dict); } else { dict.setId(0); dict.setTypes(1); dictAddList.add(dict); } } else { toastShow("名称不能为空,保存失败!"); return; } } if (dao == null) { dao = new DictDaoImpl(MainActivity.this); } // 在数据库中取出Dict对象 List<Dict> list = new ArrayList<Dict>(); if (entity_id != 0) { list = dao.getDictItem(String.valueOf(entity_id)); } // 比较数据库中取出的对象和界面上构造的对象,找出那些需要修改那些需要删除那些需要添加 for (Dict dict : list) { String dict_id = String.valueOf(dict.getId()); if (dictMap.containsKey(dict_id)) { Dict temp = dictMap.get(dict_id); if (!dict.getName().equals(temp.getName()) || dict.getOrders() != temp.getOrders()) { dict.setName(temp.getName()); dict.setOrders(temp.getOrders()); dictUpdateList.add(dict); } } else { dictDeleteList.add(dict); } } // 添加对象并建立关系 for (Dict dict : dictAddList) { // 插入对象 Long itemId = dao.insert(dict); // 建立关系... // .... } // 修改业务字典对象 for (Dict dict : dictUpdateList) { dao.update(dict); } // 删除不存在的业务字典 Integer[] ids = new Integer[dictDeleteList.size()]; for (int j = 0; j < dictDeleteList.size(); j++) { Dict dict2 = dictDeleteList.get(j); ids[j] = dict2.getId(); } dao.delete(ids); toastShow("修改[" + entityNameET + "]成功!"); } // setResult(1); // MainActivity.this.finish(); break; case R.id.btnReset: // 若为添加则重置为空,若为修改则重置为打开前的数据. nameET.setText(entity_name); initDictItemTable(); toastShow("重置成功,请重新输入"); // setResult(CrmConstances.RESULT_FAILURE); break; case R.id.btnCancel: // setResult(CrmConstances.RESULT_FAILURE); MainActivity.this.finish(); // 结束自己,即回到打开之前的Activity. toastShow("关闭"); break; default: break; } } }; public void toastShow(String text) { Toast.makeText(this, text, 1000).show(); } private void appendNewRow(final TableLayout table) { TableRow row = new TableRow(this); row.setId(0); orders++; TextView dictItemId = new TextView(this); dictItemId.setText(""); dictItemId.setVisibility(View.GONE); EditText order = new EditText(this); order.setText(String.valueOf(orders)); order.setPadding(3, 3, 3, 3); order.setWidth(40); order.setGravity(Gravity.CENTER); EditText dictName = new EditText(this); dictName.setText(""); dictName.setHint("请输入业务字典名称"); dictName.setPadding(3, 3, 3, 3); dictName.setWidth(190); dictName.setGravity(Gravity.CENTER); Button oper = new Button(this); oper.setText(" 删除 "); oper.setPadding(3, 3, 3, 3); order.setWidth(60); oper.setGravity(Gravity.CENTER); oper.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { table.removeView(table.findViewById(0)); } }); row.addView(dictItemId); row.addView(order); row.addView(dictName); row.addView(oper); table.addView(row); // LinearLayout linear = (LinearLayout) findViewById(R.id.dictLayout); // ViewGroup.LayoutParams params = (ViewGroup.LayoutParams) linear // .getLayoutParams(); // params.height = LayoutParams.WRAP_CONTENT; // params.width = LayoutParams.FILL_PARENT; // linear.setLayoutParams(params); } public void initDictItemTable() { if (dao == null) { dao = new DictDaoImpl(this); } List<Dict> list = new ArrayList<Dict>(); if (entity_id != 0) { list = dao.getDictItem(String.valueOf(entity_id)); } table.removeAllViews(); TableRow row1 = new TableRow(this); TextView dictItemId1 = new TextView(this); dictItemId1.setText(""); dictItemId1.setVisibility(View.GONE); TextView order1 = new TextView(this); order1.setText(" 序号 "); order1.setPadding(3, 3, 3, 3); order1.setWidth(40); order1.setGravity(Gravity.CENTER); TextView dictName1 = new TextView(this); dictName1.setText("字典名称"); dictName1.setPadding(3, 3, 3, 3); dictName1.setWidth(190); dictName1.setGravity(Gravity.CENTER); TextView oper1 = new TextView(this); oper1.setText(" 操作 "); oper1.setPadding(3, 3, 3, 3); oper1.setWidth(60); oper1.setGravity(Gravity.CENTER); row1.addView(dictItemId1); row1.addView(order1); row1.addView(dictName1); row1.addView(oper1); table.addView(row1); orders = 0; for (Dict dict : list) { orders = Math.max(dict.getOrders(), orders);// 取较大的作为新orders. TableRow row = new TableRow(this); row.setId(dict.getId()); TextView dictItemId = new TextView(this); dictItemId.setText(String.valueOf(dict.getId())); dictItemId.setVisibility(View.GONE); EditText order = new EditText(this); order.setText(String.valueOf(dict.getOrders())); order.setPadding(3, 3, 3, 3); order.setWidth(40); order.setGravity(Gravity.CENTER); EditText dictName = new EditText(this); dictName.setText(dict.getName()); dictName.setPadding(3, 3, 3, 3); dictName.setWidth(190); dictName.setGravity(Gravity.CENTER); Button oper = new Button(this); oper.setId(dict.getId() + 1000); // 设置这个Id,用于计算得到TableRow的Id. oper.setText(" 删除 "); oper.setPadding(3, 3, 3, 3); oper.setWidth(60); oper.setGravity(Gravity.CENTER); oper.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { System.out.println(v.getId()); table.removeView(table.findViewById(v.getId() - 1000)); } }); row.addView(dictItemId); row.addView(order); row.addView(dictName); row.addView(oper); table.addView(row, new TableLayout.LayoutParams()); } // LinearLayout linear = (LinearLayout) findViewById(R.id.dictLayout); // ViewGroup.LayoutParams params = (ViewGroup.LayoutParams) linear // .getLayoutParams(); // params.height = LayoutParams.WRAP_CONTENT; // params.width = LayoutParams.FILL_PARENT; // linear.setLayoutParams(params); } }