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102 lines
3.9 KiB
102 lines
3.9 KiB
package com.example.fruitandvegetableappointmentsapplication;
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import androidx.appcompat.app.AppCompatActivity;
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import android.app.AlertDialog;
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import android.content.ContentValues;
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import android.content.DialogInterface;
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import android.content.Intent;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.AdapterView;
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import android.widget.Button;
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import android.widget.CursorAdapter;
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import android.widget.EditText;
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import android.widget.ListView;
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import android.widget.SimpleCursorAdapter;
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import android.widget.Toast;
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public class taolun extends AppCompatActivity {
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private ListView mListView;
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private Button mBtn_insert;
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private EditText wenben;
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private SimpleCursorAdapter mSimpleCursorAdapter;
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private SQLiteDatabase mDbWriter;
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private DBHelper dbhelper;
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String name=null;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_taolun);
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initView();
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Intent intent=this.getIntent();
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name=intent.getStringExtra("username");
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mBtn_insert.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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insertData();
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wenben.setText("");
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}
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});
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dbhelper=new DBHelper(this);
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mDbWriter = dbhelper.getWritableDatabase();
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mSimpleCursorAdapter =new SimpleCursorAdapter(taolun.this,R.layout.taolun_item_layout,null,
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new String[]{"userid","pinglun"},new int[]{R.id.id,R.id.pinglunlist}, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
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mListView.setAdapter(mSimpleCursorAdapter);
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refreshListview();
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mListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
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@Override
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public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
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new AlertDialog.Builder(taolun.this).setTitle("提示").setMessage("是否删除该评论")
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.setPositiveButton("确定", new DialogInterface.OnClickListener() {
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@Override
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public void onClick(DialogInterface dialogInterface, int i) {
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deleteData(position);
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}
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}).setNegativeButton("取消",null).show();
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return true;
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}
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});
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}
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private void initView() {
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mListView = findViewById(R.id.myListview);
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mBtn_insert = findViewById(R.id.insert);
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wenben = findViewById(R.id.xiepinglun);
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}
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public void refreshListview() {
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Cursor mCursor = mDbWriter.query("pinglun", null, null, null, null, null, null);
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mSimpleCursorAdapter.changeCursor(mCursor);
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}
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public void insertData() {
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ContentValues mContentValues = new ContentValues();
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mContentValues.put("userid", name);
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mContentValues.put("pinglun", wenben.getText().toString().trim());
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mDbWriter.insert("pinglun", null, mContentValues);
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refreshListview();
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}
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public void deleteData(int positon) {
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Cursor mCursor = mSimpleCursorAdapter.getCursor();
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mCursor.moveToPosition(positon);
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int itemId = mCursor.getInt(mCursor.getColumnIndex("_id"));
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String username = mCursor.getString(mCursor.getColumnIndex("userid"));
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if(username.equals(name)){
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mDbWriter.delete("pinglun", "_id=?", new String[]{itemId + ""});
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refreshListview();
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}else if(username.length()==0){
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Toast.makeText(taolun.this,"您无权删除游客信息！！", Toast.LENGTH_SHORT).show();
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}
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else{
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new AlertDialog.Builder(taolun.this).setTitle("提示").setMessage("您无权限删除该信息！").show();
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}
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}
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} |