Android实现风蓝记事本（6）：查找记事功能

r囧r小猫 2022-05-24 04:17 260阅读 0赞

package com.example.notes;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import android.app.Activity;
    import android.app.Dialog;
    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.database.Cursor;
    import android.os.Bundle;
    import android.os.Handler;
    import android.text.Editable;
    import android.text.TextWatcher;
    import android.view.Menu;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.view.View.OnTouchListener;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.AdapterView.OnItemLongClickListener;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ImageButton;
    import android.widget.LinearLayout;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class Search extends Activity {
    
        private LinearLayout layout; // 布局容器
        private ImageButton back_btn;// 返回按钮
        private EditText search_text;// 搜索框
        private ListView search_lis;// 显示查找信息的listview
        private HashMap<Integer, Integer> idMap;// IDMap
        private Integer s_id;// 记事Id;
    
        private Dialog delDialog;// 删除对话框
        private DatabaseManage dm = null;// 数据库管理对象
        private Cursor cursor = null;
        private String word = null;
        private int background;// 背景
        private SharedPreferences sp;// 存储数据
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.search);
            layout = (LinearLayout) findViewById(R.id.search);
            back_btn = (ImageButton) findViewById(R.id.back);
            search_text = (EditText) findViewById(R.id.search_text);
            search_lis = (ListView) findViewById(R.id.search_lis);
            idMap = new HashMap<Integer, Integer>();// 获取记事ID列表
            background = R.drawable.skin_first;
            getBackground();
            back_btn.setOnClickListener(click);
            search_text.addTextChangedListener(searchs);// 搜索事件
            dm = new DatabaseManage(this);// 数据库操作对象
            dm.open();// 连接数据库
    
        }
        //设置背景
        private void getBackground() {
            sp = getSharedPreferences("backgrounds", 0);
            background = sp.getInt("background", background);
            layout.setBackgroundResource(background);
        }
    
        // 搜索事件
        private TextWatcher searchs = new TextWatcher() {
    
            @Override
            public void onTextChanged(CharSequence arg0, int arg1, int arg2,
                                      int arg3) {
                // TODO Auto-generated method stub
                word = search_text.getText().toString().trim();
                if (word.length() > 0)
                    // 显示查找的记事
                    showNotes(word);
            }
    
            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                          int arg3) {
                // TODO Auto-generated method stub
    
            }
    
            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub
    
            }
        };
    
        private void showNotes(String word) {
            // TODO Auto-generated method stub
            SimpleAdapter adapter = new SimpleAdapter(Search.this, getData(true,
                    word), R.layout.listitem, new String[] { "id", "title",
                    "content", "time" }, new int[] { R.id.id, R.id.title,
                    R.id.content, R.id.time });
            search_lis.setVisibility(View.VISIBLE);
            search_lis.setAdapter(adapter); // 生成记事列表
            search_lis.setOnItemClickListener(new OnItemClickListener() {
    
                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                                        int position, long id) {
                    // TODO Auto-generated method stub
                    ListView listView = (ListView) parent;
                    HashMap<String, Object> map = (HashMap<String, Object>) listView
                            .getItemAtPosition(position);
                    Intent intent = new Intent(Search.this, Update.class);
                    intent.putExtra("data", map);
                    startActivity(intent);
                    finish();
    
                }
            });
            search_lis.setOnItemLongClickListener(longclick);// 长按删除
    
        }
    
        public OnItemLongClickListener longclick = new OnItemLongClickListener() {
    
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view,
                                           int position, long id) {
                // TODO Auto-generated method stub
                s_id = idMap.get(position);
                deletes();
                return false;
            }
    
        };
    
        private void deletes() { // 删除记事
            View deleteView = View.inflate(this, R.layout.deletenote, null);
            delDialog = new Dialog(this, R.style.dialog);
            delDialog.setContentView(deleteView);
            Button yesBtn = (Button) deleteView.findViewById(R.id.delete_yes);
            Button noBtn = (Button) deleteView.findViewById(R.id.delete_no);
            yesBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    dm.open();
                    dm.delete(s_id);
                    Toast.makeText(Search.this, R.string.note_deleted,
                            Toast.LENGTH_SHORT).show();
                    delDialog.dismiss();
                    showNotes(word);
                }
            });
            noBtn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    delDialog.dismiss();
                }
            });
            delDialog.show();
        }
    
        private List<Map<String, Object>> getData(boolean desc, String word) {
            // TODO Auto-generated method stub
            List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
            dm.open();
            cursor = dm.selectWord(word);
            int pos = 0;
            while (cursor.moveToNext()) {
                int n_id = cursor.getInt(cursor.getColumnIndex("id"));
                idMap.put(pos, n_id);
                pos += 1;
                String n_title = cursor.getString(cursor.getColumnIndex("n_title"));
                String n_content = cursor.getString(cursor
                        .getColumnIndex("n_content"));
                String n_time = cursor.getString(cursor.getColumnIndex("n_time"));
                HashMap<String, Object> map = new HashMap<String, Object>();
                map.put("id", n_id);
                map.put("title", n_title);
                map.put("content", n_content);
                map.put("time", n_time);
                list.add(map);
            }
            cursor.close();
            dm.close();
            return list;
        }
    
        private OnClickListener click = new OnClickListener() {
    
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                switch (v.getId()) {
                    case R.id.back:
                        back();
                        break;
    
                    default:
                        break;
                }
            }
    
            private void back() {
                // TODO Auto-generated method stub
                Intent intent = new Intent(Search.this, MainActivity.class);
                startActivity(intent);
                finish();
            }
        };
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            return true;
        }
    
    }

用到的布局setContentView(R.layout.search)--》search.xml

# 注：源码下载：[https://download.csdn.net/download/weixin\_39220472/10426057][https_download.csdn.net_download_weixin_39220472_10426057] #

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[https_download.csdn.net_download_weixin_39220472_10426057]: https://download.csdn.net/download/weixin_39220472/10426057