ADD file via upload

CS体系结构-记账系统/MainActivity.java

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+package com.example.account_book;
+
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.database.Cursor;
+import android.os.Bundle;
+
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.snackbar.Snackbar;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.widget.AdapterView;
+import android.widget.DatePicker;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.Toast;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class MainActivity extends AppCompatActivity {
+
+    private List<CostBean> mCostBeanList;
+    private DatabaseHelper mDatabaseHelper;
+    private CostListAdapter mAdapter;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        mDatabaseHelper = new DatabaseHelper(this);
+        mCostBeanList = new ArrayList<>();
+        ListView costList = (ListView) findViewById(R.id.lv_main);
+
+        initCostDate();
+        mAdapter = new CostListAdapter(this, mCostBeanList);
+        costList.setAdapter(mAdapter);
+
+        //单击每一个item实现删除功能
+        costList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+            @Override
+            public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
+                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
+                builder.setTitle("删除");
+                builder.setMessage("是否删除此账单?");
+                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        mDatabaseHelper.toDelete(mCostBeanList.get(position));
+                        mCostBeanList.remove(position);
+                        mAdapter.notifyDataSetChanged();//通知list_view刷新
+                    }
+                });
+                builder.setNegativeButton("取消",null);
+                builder.create().show();
+            }
+        });
+
+
+        FloatingActionButton fab = findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
+                LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
+                View viewDialog = inflater.inflate(R.layout.new_cost, null);//联系new_cost布局，才能使用布局中的数据元素
+                final EditText title = (EditText) viewDialog.findViewById(R.id.ct_cost_title);
+                final EditText money = (EditText) viewDialog.findViewById(R.id.ct_cost_money);
+                final DatePicker date = (DatePicker) viewDialog.findViewById(R.id.ct_cost_date);
+                builder.setView(viewDialog);//将布局设置给dialog
+                builder.setTitle("新建支出");//dialog的标题
+                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {//当点击确定时，
+                        CostBean costBean = new CostBean();
+                        costBean.costTitle = title.getText().toString();//将对应的属性输入
+                        costBean.costMoney = money.getText().toString();
+                        costBean.costDate = date.getYear() + "-" + (date.getMonth() + 1) + "-" +
+                                date.getDayOfMonth();
+
+                        //储存date时特别要注意，我们后面要根据costDate排序，所以要将其标准化
+                        costBean.costDate = date.getYear()+"-";
+                        if(date.getMonth()+1<10)   costBean.costDate+="0";
+                        costBean.costDate+=(date.getMonth()+1)+"-";
+                        if(date.getDayOfMonth()<10)    costBean.costDate+="0";
+                        costBean.costDate+=date.getDayOfMonth();
+
+                        //当输入为空时提醒
+                        if("".equals(costBean.costTitle) || "".equals(costBean.costMoney) || "".equals(costBean.costDate))
+                        {
+                            Toast.makeText(MainActivity.this,"信息不完整",Toast.LENGTH_SHORT).show();
+                            return;
+                        }
+                        if(costBean.costMoney.length()>4)
+                        {
+                            Toast.makeText(MainActivity.this,"金额过大",Toast.LENGTH_SHORT).show();
+                            return;
+                        }
+                        mDatabaseHelper.insertCost(costBean);//将数据插入数据库
+
+                        mCostBeanList.add(costBean);//将list改变，才能刷新
+                        mAdapter.notifyDataSetChanged();//通知list_view刷新，这样才能显示新的账单
+                    }
+                });
+                builder.setNegativeButton("取消", null);//取消时退出
+                builder.create().show();//显示dialog，即自定义的布局
+            }
+        });
+    }
+
+
+    private void initCostDate() {
+        /*
+        mDatabaseHelper.deleteAllData();//清理所有数据
+        for (int i=0; i<6; i++) {
+            CostBean costBean = new CostBean();
+            costBean.costTitle = i + "mock";
+            costBean.costDate = "11-11";
+            costBean.costMoney = "20";
+            mDatabaseHelper.insertCost(costBean);
+        }*/
+        Cursor cursor = mDatabaseHelper.getAllCostData();//数据库中插入所有数据并显示到list_view中
+        if(cursor != null){
+            while (cursor.moveToNext()){
+                CostBean costBean = new CostBean();
+                costBean.costTitle = cursor.getString(cursor.getColumnIndex("cost_title"));
+                costBean.costDate = cursor.getString(cursor.getColumnIndex("cost_date"));
+                costBean.costMoney = cursor.getString(cursor.getColumnIndex("cost_money"));
+                mCostBeanList.add(costBean);
+            }
+            cursor.close();
+        }
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.menu_main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+        {
+
+            //noinspection SimplifiableIfStatement
+            if (id == R.id.action_chart) {
+                Intent intent = new Intent(MainActivity.this, ChartsActivity.class);
+                intent.putExtra("cost_list", (Serializable) mCostBeanList);//将消费金额序列化传给chart
+                startActivity(intent);
+                return true;
+            }
+
+//            else if (id == R.id.action_about){
+//                Intent intent_a = new Intent(getApplicationContext(),AboutActivity.class);
+//                startActivity(intent_a);
+//                return true;
+//
+//            }
+            else if (id == R.id.action_about){
+                Intent intent_a = new Intent(getApplicationContext(),web.class);
+                startActivity(intent_a);
+                return true;
+
+            }
+
+            else if (id  == R.id.anction_delete_all){
+                mDatabaseHelper.deleteAllData();
+                mCostBeanList.clear();
+                mAdapter.notifyDataSetChanged();
+                return true;
+            }
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+}