Android接入WebView（四）——瀏覽器書籤與歷史記錄詳細處理
阿新 • • 發佈：2019-01-25
最近寫了一個基於webview和zxing，sqlite實現的一款瀏覽器
主要功能有：掃描二維碼以及開啟本地二維碼載入網頁，書籤和歷史記錄管理，無痕瀏覽，分享網址，分享網址二維碼，瀏覽器出錯自定義等功能。
前段時間很忙，現在終於有時間來寫寫書籤和歷史記錄的詳細處理了
由於書籤處理和歷史記錄處理類似，我這裡只寫怎麼處理歷史記錄，總共包含如下幾個函式：
實現的功能：顯示歷史記錄並點選可進入，長按出現功能選單，以及檢視詳細資訊：
好了，現在說幾個重要的，文末會給出全部程式碼
我們進入history Activity後，會顯示最近瀏覽過的網址，按訪問時間逆序排序，即最後訪問的出現在最前面，這也符合大多數人的使用習慣。
這個函式實現的功能就是逆序查詢資料庫：
如果返回不為空，布林變數if_exsit就置為true，再把返回資料繫結到listview上；
如果返回為空，布林變數if_exsit就置為false，並把listview設定為預設的內容
map.put("title", "暫時沒有瀏覽記錄");
map.put("url", "此處是存放您歷史記錄地方");//資料庫逆序查詢函式： public void queryinfo(){ final ArrayList<HashMap<String, Object>> listItem = new ArrayList <HashMap<String,Object>>();/*在陣列中存放資料*/ //第二個引數是資料庫名 dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1); SQLiteDatabase db = dbHelper.getWritableDatabase(); //Cursor cursor = db.rawQuery("select * from bookmarkDB", null); //查詢語句也可以這樣寫 Cursor cursor = db.query("historyDB", null, null, null, null, null, "id desc"); if (cursor != null && cursor.getCount() > 0) { if_exsit=true; while(cursor.moveToNext()) { get_id=cursor.getInt(0);//得到int型的自增變數 get_title = cursor.getString(1); get_url = cursor.getString(2); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("title", get_title); map.put("url", get_url); arrayList.add(get_id); listItem.add(map); //new String 資料來源， new int 資料到哪去 SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,R.layout.list_item, new String[] {"title","url"}, new int[] {R.id.textView2,R.id.textView3}); lv.setAdapter(mSimpleAdapter);//為ListView繫結介面卡 } } else { if_exsit=false; HashMap<String, Object> map = new HashMap<String, Object>(); map.put("title", "暫時沒有瀏覽記錄"); map.put("url", "此處是存放您歷史記錄地方"); listItem.add(map); //new String 資料來源， new int 資料到哪去 SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,R.layout.item_list, new String[] {"title","url"}, new int[] {R.id.textView2,R.id.textView3}); lv.setAdapter(mSimpleAdapter);//為ListView繫結介面卡 } cursor.close(); db.close(); }
然後是刪除資料後的處理：
刪除資料後，我們要重新整理一次UI，處理如下：
最後兩行程式碼是清空與listview繫結的ArrayList，並且重新執行queryinfo()載入UI
//刪除函式： public void delete(int position){ dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1); SQLiteDatabase db = dbHelper.getWritableDatabase(); db.delete("historyDB","id=?",new String[] {String.valueOf(arrayList.get(position))}); db.close(); Toast.makeText(this,"刪除成功",Toast.LENGTH_SHORT).show(); //刪除後清空陣列，重新放入資料，重新整理UI arrayList.clear(); queryinfo(); }
然後是點選listview，當if_exsit為true的時候才返回MainActivity載入網頁：
if (if_exsit) {
Intent mIntent = new Intent();//沒有任何引數（意圖），只是用來傳遞資料
mIntent.putExtra("2_data_return", query_by_id(position));
setResult(RESULT_OK, mIntent);
finish();
}然後是檢視詳細資訊：
在history裡面，詳細資訊顯示為TextView，不可編輯，在bookmark裡面，為EditText，可以編輯
//url詳細資訊對話方塊
public void url_infomation(final int position){
final Dialog dialog = new Dialog(this, R.style.NormalDialogStyle);
View view = View.inflate(this, R.layout.history_url_informatiom, null);
text_title = (TextView) view.findViewById(R.id.textView4);
text_url = (TextView) view.findViewById(R.id.textView5);
dialog.setContentView(view);
//使得點選對話方塊外部可消失對話方塊
dialog.setCanceledOnTouchOutside(true);
//設定對話方塊的大小
view.setMinimumHeight((int) (ScreenSizeUtils.getInstance(this).getScreenHeight() * 0.23f));
Window dialogWindow = dialog.getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
lp.width = (int) (ScreenSizeUtils.getInstance(this).getScreenWidth() * 0.75f);
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
lp.gravity = Gravity.CENTER;
dialogWindow.setAttributes(lp);
//顯示詳細資訊
text_url.setText(query_by_id(position));
text_title.setText(titler);
dialog.show();
}下面給出完整history Activity的程式碼：
package mountain_hua.browser;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
/**
* Created by dhs on 2018/7/27.
*/
public class history extends AppCompatActivity {
private ListView lv;
private MyDatabaseHelper dbHelper;
private String get_title,get_url;//暫存從資料庫得到的title和url
private int get_id; //暫存從資料庫得到的id
private String titler, url;//按值查詢詳細資訊
int id; //按值查詢id
private TextView text_title, text_url;//書籤詳細資訊edittext
private ArrayList arrayList=new ArrayList();
private boolean if_exsit;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.history);
lv=(ListView)findViewById(R.id.history_list);
queryinfo();
//點選函式：
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (if_exsit) {
Intent mIntent = new Intent();//沒有任何引數（意圖），只是用來傳遞資料
mIntent.putExtra("2_data_return", query_by_id(position));
setResult(RESULT_OK, mIntent);
finish();
}
}
});
//長按選擇刪除
lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
if (if_exsit)
dialog_bottom(position);
return true;
}
});
}
//刪除函式：
public void delete(int position){
dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1);
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.delete("historyDB","id=?",new String[] {String.valueOf(arrayList.get(position))});
db.close();
Toast.makeText(this,"刪除成功",Toast.LENGTH_SHORT).show();
//刪除後清空陣列，重新放入資料，重新整理UI
arrayList.clear();
queryinfo();
}
//全部刪除
public void delete_all(){
dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1);
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from historyDB", null);
while (cursor.moveToNext()) {
id=cursor.getInt(0);
db.delete("historyDB","id=?",new String[] {String.valueOf(id)});
}
cursor.close();
db.close();
Toast.makeText(this,"刪除成功",Toast.LENGTH_SHORT).show();
//刪除後清空陣列，重新放入資料，重新整理UI
arrayList.clear();
queryinfo();
}
//全部刪除對話方塊
public void delete_all_dialog(){
AlertDialog dialog = new AlertDialog.Builder(this)
.setTitle("確定全部刪除嗎？")//設定對話方塊的標題
//設定對話方塊的按鈕
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.setPositiveButton("確定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
delete_all();
dialog.dismiss();
}
}).create();
dialog.show();
}
//資料庫逆序查詢函式：
public void queryinfo(){
final ArrayList<HashMap<String, Object>> listItem = new ArrayList <HashMap<String,Object>>();/*在陣列中存放資料*/
//第二個引數是資料庫名
dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1);
SQLiteDatabase db = dbHelper.getWritableDatabase();
//Cursor cursor = db.rawQuery("select * from bookmarkDB", null);
//查詢語句也可以這樣寫
Cursor cursor = db.query("historyDB", null, null, null, null, null, "id desc");
if (cursor != null && cursor.getCount() > 0) {
if_exsit=true;
while(cursor.moveToNext()) {
get_id=cursor.getInt(0);//得到int型的自增變數
get_title = cursor.getString(1);
get_url = cursor.getString(2);
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("title", get_title);
map.put("url", get_url);
arrayList.add(get_id);
listItem.add(map);
//new String 資料來源， new int 資料到哪去
SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,R.layout.list_item,
new String[] {"title","url"},
new int[] {R.id.textView2,R.id.textView3});
lv.setAdapter(mSimpleAdapter);//為ListView繫結介面卡
}
}
else {
if_exsit=false;
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("title", "暫時沒有瀏覽記錄");
map.put("url", "此處是存放您歷史記錄地方");
listItem.add(map);
//new String 資料來源， new int 資料到哪去
SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,R.layout.item_list,
new String[] {"title","url"},
new int[] {R.id.textView2,R.id.textView3});
lv.setAdapter(mSimpleAdapter);//為ListView繫結介面卡
}
cursor.close();
db.close();
}
//按值查詢：
public String query_by_id(int position){
dbHelper = new MyDatabaseHelper(this,"usersDataBase",null,1);
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from historyDB", null);
while (cursor.moveToNext()) {
url = cursor.getString(2);
titler=cursor.getString(1);
id=cursor.getInt(0);
//找到id相等的就返回url
if (arrayList.get(position).equals(id))
break;
}
cursor.close();
db.close();
return url;
}
//url詳細資訊對話方塊
public void url_infomation(final int position){
final Dialog dialog = new Dialog(this, R.style.NormalDialogStyle);
View view = View.inflate(this, R.layout.history_url_informatiom, null);
text_title = (TextView) view.findViewById(R.id.textView4);
text_url = (TextView) view.findViewById(R.id.textView5);
dialog.setContentView(view);
//使得點選對話方塊外部可消失對話方塊
dialog.setCanceledOnTouchOutside(true);
//設定對話方塊的大小
view.setMinimumHeight((int) (ScreenSizeUtils.getInstance(this).getScreenHeight() * 0.23f));
Window dialogWindow = dialog.getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
lp.width = (int) (ScreenSizeUtils.getInstance(this).getScreenWidth() * 0.75f);
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
lp.gravity = Gravity.CENTER;
dialogWindow.setAttributes(lp);
//顯示詳細資訊
text_url.setText(query_by_id(position));
text_title.setText(titler);
dialog.show();
}
//底部對話方塊
public void dialog_bottom(final int position){
//彈出對話方塊
final Dialog dialog = new Dialog(this, R.style.NormalDialogStyle);
View view = View.inflate(this, R.layout.history_dialog_bottom, null);
dialog.setContentView(view);
dialog.setCanceledOnTouchOutside(true);
view.setMinimumHeight((int) (ScreenSizeUtils.getInstance(this).getScreenHeight() * 0.23f));
Window dialogWindow = dialog.getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
lp.width = (int) (ScreenSizeUtils.getInstance(this).getScreenWidth() * 0.9f);
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
lp.gravity = Gravity.BOTTOM;
dialogWindow.setAttributes(lp);
dialog.show();
//點選事件
view.findViewById(R.id.cancel).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//取消對話方塊
dialog.dismiss();
}
});
view.findViewById(R.id.delete).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//刪除制定position，並取消對話方塊
delete(position);
dialog.dismiss();
}
});
view.findViewById(R.id.lookup).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//檢視、修改
dialog.dismiss();
url_infomation(position);
}
});
view.findViewById(R.id.clear_all).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//全部刪除
dialog.dismiss();
delete_all_dialog();
}
});
}
}