Android应用源码基于安卓的校园二手交易系统源码（毕业设计）.zip

package com.example.secondhandtransaction; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ImageButton; import android.widget.Spinner; import android.widget.TextView; import android.widget.Toast; import com.example.database.UserDbHelper; import com.example.po.Commodity; import com.example.database.CommodityDbHelper; import java.io.ByteArrayOutputStream; //将用户唯一ID导入 import static com.example.secondhandtransaction.LoginActivity.only_userid; import static com.example.secondhandtransaction.LoginEmailActivity.only_emailid; //发布商品页面 public class ReleaseActivity extends AppCompatActivity { TextView tvStuId; ImageButton ivPhoto; EditText etTitle,etPrice,etPhone,etDescription; Spinner spType; String userid; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_release); //取出学号 //tvStuId = findViewById(R.id.tv_student_id); //tvStuId.setText(this.getIntent().getStringExtra("user_id")); // Button btnBack = findViewById(R.id.btn_back); // //返回按钮点击事件 // btnBack.setOnClickListener(new View.OnClickListener() { // @Override // public void onClick(View v) { // finish(); // } // }); userid=only_userid; if (only_userid.equals("")) { UserDbHelper dbhelper1 = new UserDbHelper(this); SQLiteDatabase db1 = dbhelper1.getReadableDatabase(); String sql1 = "SELECT * FROM users WHERE email=?"; Cursor cursor1 = db1.rawQuery(sql1, new String[]{only_emailid}); if (cursor1.getCount() == 0) { Toast.makeText(getApplicationContext(), "用户不存在！", Toast.LENGTH_SHORT).show(); } else { if (cursor1.moveToFirst()) { try { userid = cursor1.getString(cursor1.getColumnIndex("userId")); } catch (Exception e) { e.printStackTrace(); } } } } ivPhoto = findViewById(R.id.iv_photo); ivPhoto.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(Intent.ACTION_PICK,null); intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,"image/*"); startActivityForResult(intent,1); } }); etTitle = findViewById(R.id.et_title); etPrice = findViewById(R.id.et_price); etPhone = findViewById(R.id.et_phone); etDescription = findViewById(R.id.et_description); spType = findViewById(R.id.spn_type); Button btnPublish = findViewById(R.id.btn_publish); //发布按钮点击事件 btnPublish.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //先检查合法性 if(CheckInput()) { CommodityDbHelper dbHelper = new CommodityDbHelper(getApplicationContext(), CommodityDbHelper.DB_NAME, null, 1); Commodity commodity = new Commodity(); //把图片先转化成bitmap格式 BitmapDrawable drawable = (BitmapDrawable) ivPhoto.getDrawable(); Bitmap bitmap = drawable.getBitmap(); //二进制数组输出流 ByteArrayOutputStream byStream = new ByteArrayOutputStream(); //将图片压缩成质量为100的PNG格式图片 bitmap.compress(Bitmap.CompressFormat.PNG, 40, byStream); //把输出流转换为二进制数组 byte[] byteArray = byStream.toByteArray(); commodity.setPicture(byteArray); commodity.setTitle(etTitle.getText().toString()); commodity.setCategory(spType.getSelectedItem().toString()); commodity.setPrice(Float.parseFloat(etPrice.getText().toString())); commodity.setPhone(etPhone.getText().toString()); commodity.setDescription(etDescription.getText().toString()); commodity.setStuId(userid); if (dbHelper.AddCommodity(commodity)) { Toast.makeText(getApplicationContext(), "商品信息发布成功!", Toast.LENGTH_SHORT).show(); finish(); }else { Toast.makeText(getApplicationContext(), "商品信息发布失败!", Toast.LENGTH_SHORT).show(); } } } }); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == 1) { //从相册返回的数据 if (data != null) { //得到图片的全路径 Uri uri = data.getData(); ivPhoto.setImageURI(uri); } } } /** * 检查输入是否合法 */ public boolean CheckInput() { String title = etTitle.getText().toString(); String price = etPrice.getText().toString(); String type = spType.getSelectedItem().toString(); String phone = etPhone.getText().toString(); String description = etDescription.getText().toString(); if (title.trim().equals("")) { Toast.makeText(this,"商品标题不能为空!",Toast.LENGTH_SHORT).show(); return false; } if (price.trim().equals("")) { Toast.makeText(this,"商品价格不能为空!",Toast.LENGTH_SHORT).show(); return false; } if (type.trim().equals("请选择类别")) { Toast.makeText(this,"商品类别未选择!",Toast.LENGTH_SHORT).show(); return false; } if (phone.trim().equals("")) { Toast.makeText(this,"手机号码不能为空!",Toast.LENGTH_SHORT).show(); return false; } if (description.trim().equals("")) { Toast.makeText(this,"商品描述不能为空!",Toast.LENGTH_SHORT).show(); return false; } return true; } // final SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss "); // // dbHelper = new DatabaseHelper(this); // SQLiteDatabase db = dbHelper.getReadableDatabase(); // String[] ctype = new String[]{"生活用品", "学习用品", "电子产品", "体育用品"}; // ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, ctype); //创建一个数组适配器 // adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //设置下拉列表框的下拉选项样式 // Spinner spinner = (Spinner) super.findViewById(R.id.m1_style); // spinner.setAdapter(adapter); // sp = (Spinner) findViewById(R.id.m1_style); // final String kind = (String) sp.getSelectedItem(); // // imageButton=(ImageButton)findViewById(R.id.m1_image); // imageButton.setOnClickListener(new View.OnClickListener() { // @Override // public void onClick(View v) { // if (Cont