編輯：關於Android編程
開發隨筆，小結項目開發中的得與失，項目優化工作，用到了以下幾個知識點，在這裡和大家分享一下：
進展-界面、推薦邏輯優化：
layout_margin、layout_height微調，對界面精雕細琢：
android:layout_margin="2dp"
雙指針優化，不能直接賦值，否則游標聯動，大坑：
Cursor cursor = db.query("Room", null, null, null, null, null,
"name,time");
Cursor cursorNext = db.query("Room", null, null, null, null, null,
"name,time");
對推薦功能的邏輯進行簡簡化，輔以Log調試，測試通過：
suggest_btn_suggest = (Button) findViewById(R.id.suggest_btn_suggest);
suggest_btn_suggest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.query("Room", null, null, null, null, null,
"name,time");
Cursor cursorNext = db.query("Room", null, null, null, null, null,
"name,time");
//public Cursor query (String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)
if (cursor.moveToFirst() && cursorNext.moveToFirst()) {
do {
String local = cursor.getString(cursor
.getColumnIndex("local"));
String time = cursor.getString(cursor
.getColumnIndex("time"));
String name = cursor.getString(cursor.getColumnIndex("name"));
Log.d("權興權意-Cursor", "name-" + name + " time-" + time + " local-" + local);
String localArray[] = local.split("-");
String timeArray[] = time.split("-");
// Log.d(TAG, name + "-localArray[0]:" + localArray[0] + ",mLou:" + mLou + ",localArray[1]" + localArray[1] + ",mCeng:" + mCeng);
if(localArray[0].equals(mLou) && localArray[1].equals(mCeng)){//樓層匹配
//1.會議室為空，無會議，直接預訂；
if (time.equals("")){
roomName = name;
roomLocal = local;
break;
}else{
//2.會議室非空
mStartTime = FormatTime(mStartHour) + ":" + FormatTime(mStartMinute);//預訂會議開始時間
mEndTime = FormatTime(mEndHour) + ":" + FormatTime(mEndMinute);//預訂會議結束時間
// Log.d(TAG, "mStartTime:" + mStartTime + ",mEndTime:" + mEndTime);
// Log.d(TAG, "cursorNext.moveToPosition cursor.getPosition() + 1:" + cursorNext.moveToPosition(cursor.getPosition() + 1));
// Log.d(TAG, "cursorNext.getString(cursorNext.getColumnIndex(\"name\")):" + cursorNext.getString(cursorNext.getColumnIndex("name")));
// Log.d(TAG, "cursor.getString(cursor.getColumnIndex(\"name\")):" + cursor.getString(cursor.getColumnIndex("name")));
//2.1會議室只有一場會議
if(!cursorNext.moveToPosition(cursor.getPosition() + 1) || !cursorNext.getString(cursorNext.getColumnIndex("name")).equals(cursor.getString(cursor.getColumnIndex("name")))){
//預訂會議結束時間早於原會議開始時間或者預訂會議開始時間晚於原會議結束時間
Log.d(TAG, "timeArray[0]:" + timeArray[0] + "timeArray[1]:" + timeArray[1]);
if(mEndTime.compareTo(timeArray[0]) < 0 || mStartTime.compareTo(timeArray[1]) > 0){
roomName = name;
roomLocal = local;
//Log.d(TAG, "2.1會議室只有一場會議:" + roomName + roomLocal);
break;
}
}
//2.2.會議室有多場會議，遍歷操作，區間：
//將會議室會議根據時間按降序排列A,B，取區間如圖A-C-B，
//C的開始時間晚於A的結束時間，
//C的結束時間早於B的開始時間，
if(mStartTime.compareTo(timeArray[1]) > 0 && cursorNext.moveToPosition(cursor.getPosition() + 1)){
if(name.equals(cursorNext.getString(cursor.getColumnIndex("name")))){
String timeNext = cursorNext.getString(cursor
.getColumnIndex("time"));
String timeArrayNext[] = timeNext.split("-");
if(timeArrayNext[0].compareTo(mEndTime) > 0){
roomName = name;
roomLocal = local;
break;
}
}
}
}
}
// Log.d("權興權意：", "nameCur-" + nameCur);
// Log.d("權興權意：", "passwordCur-" + passwordCur);
// Log.d("權興權意：", "idCur-" + idCur);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
Intent intent = new Intent();
intent.setClass(SuggestActivity.this, RoomListActivity.class);
intent.putExtra("roomName",roomName);
intent.putExtra("roomLocal",roomLocal);
startActivity(intent);
}
});
AS插件，見文末小彩蛋。
屬性動畫，見另一篇博客。
小結：
進展-界面、推薦邏輯優化：
layout_margin、layout_height微調；
雙指針優化，簡化情況，Log調試；
AS插件，屬性動畫。
文末小彩蛋：
Android Studio安裝插件的方式其實和Eclipse大同小異。廢話不多說，直接上圖：
區域1：你當前已經安裝了的插件
區域2：在線安裝
區域3：從硬盤安裝，即針對你已經下載好了的插件，可通過這項選擇到你下好的插件，進行安裝。
還有一個Install JetBrains plugin其實和區域2是一樣的，只是這邊將JetBrains類型的插件放一起了，便於安裝而已。
這邊再講下區域2，點擊出現下圖，可以直接在輸入框中搜索你要安裝的插件，然後點擊右邊的install按鍵即可。
比如我要安裝Findbugs:
最後附上推薦模塊核心源代碼，歡迎交流：
package com.quan.car.qmeeting;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.TimePicker;
import utils.MyDatabaseHelper;
/**
* Created by 權興權意 on 2016/8/23.
*/
public class SuggestActivity extends Activity{
private TimePicker startTime_tp_suggest;
private TimePicker endTime_tp_suggest;
private TextView time_tv_suggest;
private Button yesTime_btn_suggest;
private int mStartHour;
private int mStartMinute;
private int mEndHour;
private int mEndMinute;
private String mStartTime;
private String mEndTime;
private RadioGroup lou_rg_suggest;
private RadioGroup ceng_rg_suggest;
private TextView floor_tv_suggest;
private Button yesFloor_btn_suggest;
private String mLou;
private String mCeng;
private Button suggest_btn_suggest;
private MyDatabaseHelper dbHelper;
private String roomName;
private String roomLocal;
private static final String TAG = "SuggestActivity";
// private static final String TAG = "SuggestActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.suggest);
// Log.d(TAG, "onCreate: ");
// Log.d(TAG, "onCreate() called with: " + "savedInstanceState = [" + savedInstanceState + "]");
// Intent i = getIntent();
// roomName = i.getStringExtra("roomName");
// roomLocal = i.getStringExtra("roomLocal");
dbHelper = new MyDatabaseHelper(this, "Meeting.db", null, MyDatabaseHelper.DB_VERSION);
time_tv_suggest = (TextView) findViewById(R.id.time_tv_suggest);
startTime_tp_suggest = (TimePicker) findViewById(R.id.startTime_tp_suggest);
startTime_tp_suggest.setIs24HourView(true);
startTime_tp_suggest.setCurrentHour(startTime_tp_suggest.getCurrentHour());
startTime_tp_suggest.setCurrentMinute(startTime_tp_suggest.getCurrentMinute());
startTime_tp_suggest.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hour, int minute) {
mStartHour = hour;
mStartMinute = minute;
}
});
endTime_tp_suggest = (TimePicker) findViewById(R.id.endTime_tp_suggest);
endTime_tp_suggest.setIs24HourView(true);
endTime_tp_suggest.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hour, int minute) {
mEndHour = hour;
mEndMinute = minute;
}
});
yesTime_btn_suggest = (Button) findViewById(R.id.yesTime_btn_suggest);
yesTime_btn_suggest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
time_tv_suggest.setText(new StringBuffer().append(" ").append(FormatTime(mStartHour))
.append(":").append(FormatTime(mStartMinute))
.append("-").append(FormatTime(mEndHour))
.append(":").append(FormatTime(mEndMinute)));
}
});
floor_tv_suggest = (TextView) findViewById(R.id.floor_tv_suggest);
lou_rg_suggest = (RadioGroup) findViewById(R.id.lou_rg_suggest);
lou_rg_suggest.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int id) {
switch (id){
case R.id.e11_rb_suggest:
//Toast.makeText(SuggestActivity.this, "E11", Toast.LENGTH_SHORT).show();
mLou = "E11";
break;
case R.id.e13_rb_suggest:
//Toast.makeText(SuggestActivity.this, "E13", Toast.LENGTH_SHORT).show();
mLou = "E13";
break;
default:
break;
}
}
});
ceng_rg_suggest = (RadioGroup) findViewById(R.id.ceng_rg_suggest);
ceng_rg_suggest.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup radioGroup, int id) {
switch (id){
case R.id.ceng1_rb_suggest:
//Toast.makeText(SuggestActivity.this, "1", Toast.LENGTH_SHORT).show();
mCeng = "1";
break;
case R.id.ceng2_rb_suggest:
//Toast.makeText(SuggestActivity.this, "2", Toast.LENGTH_SHORT).show();
mCeng = "2";
break;
case R.id.ceng3_rb_suggest:
//Toast.makeText(SuggestActivity.this, "3", Toast.LENGTH_SHORT).show();
mCeng = "3";
break;
case R.id.ceng4_rb_suggest:
//Toast.makeText(SuggestActivity.this, "4", Toast.LENGTH_SHORT).show();
mCeng = "4";
break;
case R.id.ceng5_rb_suggest:
//Toast.makeText(SuggestActivity.this, "5", Toast.LENGTH_SHORT).show();
mCeng = "5";
break;
default:
break;
}
}
});
yesFloor_btn_suggest = (Button) findViewById(R.id.yesFloor_btn_suggest);
yesFloor_btn_suggest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
floor_tv_suggest.setText(new StringBuffer().append(" ").append((mLou))
.append("-").append(mCeng));
//roomLocal = mLou + "-" + mCeng;
}
});
suggest_btn_suggest = (Button) findViewById(R.id.suggest_btn_suggest);
suggest_btn_suggest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.query("Room", null, null, null, null, null,
"name,time");
Cursor cursorNext = db.query("Room", null, null, null, null, null,
"name,time");
//public Cursor query (String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)
if (cursor.moveToFirst() && cursorNext.moveToFirst()) {
do {
String local = cursor.getString(cursor
.getColumnIndex("local"));
String time = cursor.getString(cursor
.getColumnIndex("time"));
String name = cursor.getString(cursor.getColumnIndex("name"));
Log.d("權興權意-Cursor", "name-" + name + " time-" + time + " local-" + local);
String localArray[] = local.split("-");
String timeArray[] = time.split("-");
// Log.d(TAG, name + "-localArray[0]:" + localArray[0] + ",mLou:" + mLou + ",localArray[1]" + localArray[1] + ",mCeng:" + mCeng);
if(localArray[0].equals(mLou) && localArray[1].equals(mCeng)){//樓層匹配
//1.會議室為空，無會議，直接預訂；
if (time.equals("")){
roomName = name;
roomLocal = local;
break;
}else{
//2.會議室非空
mStartTime = FormatTime(mStartHour) + ":" + FormatTime(mStartMinute);//預訂會議開始時間
mEndTime = FormatTime(mEndHour) + ":" + FormatTime(mEndMinute);//預訂會議結束時間
// Log.d(TAG, "mStartTime:" + mStartTime + ",mEndTime:" + mEndTime);
// Log.d(TAG, "cursorNext.moveToPosition cursor.getPosition() + 1:" + cursorNext.moveToPosition(cursor.getPosition() + 1));
// Log.d(TAG, "cursorNext.getString(cursorNext.getColumnIndex(\"name\")):" + cursorNext.getString(cursorNext.getColumnIndex("name")));
// Log.d(TAG, "cursor.getString(cursor.getColumnIndex(\"name\")):" + cursor.getString(cursor.getColumnIndex("name")));
//2.1會議室只有一場會議
if(!cursorNext.moveToPosition(cursor.getPosition() + 1) || !cursorNext.getString(cursorNext.getColumnIndex("name")).equals(cursor.getString(cursor.getColumnIndex("name")))){
//預訂會議結束時間早於原會議開始時間或者預訂會議開始時間晚於原會議結束時間
Log.d(TAG, "timeArray[0]:" + timeArray[0] + "timeArray[1]:" + timeArray[1]);
if(mEndTime.compareTo(timeArray[0]) < 0 || mStartTime.compareTo(timeArray[1]) > 0){
roomName = name;
roomLocal = local;
//Log.d(TAG, "2.1會議室只有一場會議:" + roomName + roomLocal);
break;
}
}
//2.2.會議室有多場會議，遍歷操作，區間：
//將會議室會議根據時間按降序排列A,B，取區間如圖A-C-B，
//C的開始時間晚於A的結束時間，
//C的結束時間早於B的開始時間，
if(mStartTime.compareTo(timeArray[1]) > 0 && cursorNext.moveToPosition(cursor.getPosition() + 1)){
if(name.equals(cursorNext.getString(cursor.getColumnIndex("name")))){
String timeNext = cursorNext.getString(cursor
.getColumnIndex("time"));
String timeArrayNext[] = timeNext.split("-");
if(timeArrayNext[0].compareTo(mEndTime) > 0){
roomName = name;
roomLocal = local;
break;
}
}
}
}
}
// Log.d("權興權意：", "nameCur-" + nameCur);
// Log.d("權興權意：", "passwordCur-" + passwordCur);
// Log.d("權興權意：", "idCur-" + idCur);
} while (cursor.moveToNext());
}
cursor.close();
db.close();
Intent intent = new Intent();
intent.setClass(SuggestActivity.this, RoomListActivity.class);
intent.putExtra("roomName",roomName);
intent.putExtra("roomLocal",roomLocal);
startActivity(intent);
}
});
// Toast.makeText(SuggestActivity.this, "SuggestActivity--" + mHour + ":" + mMinute,
// Toast.LENGTH_SHORT).show();
}
private String FormatTime(int time){
String s = Integer.toString(time);
if(s.length() == 1){
s = "0" + s;
}
return s;
}
}
《第一行代碼》——第6章 數據存儲全方案，詳解持久化技術
瞬時數據是指那些存儲在內存當中，有可能會因為程序關閉或其他原因導致內存被回收而丟失的數據。這對於一些關鍵性的數據信息來說是絕對不能容忍的，誰都不希望自己剛發出去的一條微博
Android自定義控件實現可左右滑動的導航條
先上效果圖：這個控件其實算是比較輕量級的，相信不少小伙伴都能做出來。因為項目中遇到了一些特殊的定制要求，所以就自己寫了一個，這裡放出來。 首先來分析下這個控件的
深入剖析Android中Service和Thread區別
Service既不是進程也不是線程，它們之間的關系如下：可能有的朋友會問了，既然是長耗時的操作，那麼Thread也可以完成啊。沒錯，在程序裡面很多耗時工作我們也可以通過T
EditText輔助控件—TextInputLayout
1.介紹TextInputLayout是一個用於在EditText上顯示Floating效果的輔助控件。效果圖如下：2.使用方法import android.conten
