更改ActionBar的background color
直接在程式碼中設定
//取得色碼 String color = getResources().getString(R.color.mycolor); //注意Color.parseColor必須帶入8碼色碼,如#FF3D3D3D,若帶入4碼顏色會不正確 getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor(color)));
作者: zgh149
WifiInfo wifiInfo = WifiManager.getConnectionInfo(); 可取得目前wifi連線的資訊 wifiInfo.getBSSID(); 可取得目前連結AP的BSSID, BSSID等同於MAC address wifiInfo.getMacAddress()); 可取得目前device的MAC address wifiInfo.getSSID(); 可取得SSID名稱
1. 安裝 synergy
sudo apt-get install synergy
Note : 安裝完成後 synergy 的執行檔位於 /usr/bin/synergys
2. 檢查配置檔(config file)是否位於以下2個位置，不存在可自行新增於~/.synergy.conf，新增內容參考3-3。
~/.synergy.config or ~/.config/Synergy/Synergy.conf
Note : 測試 config file 是否設定正確，可在 console 輸入 synergys，設定錯誤顯示如下訊息
2016-01-14T11:36:10 ERROR: cannot read configuration "/home/foxx/.synergy.conf": read error: line 1: found data outside section /build/buildd/synergy-1.3.8/src/cmd/synergys/synergys.cpp,1130 synergys: no configuration available
設定完成後必須重新啟動 synergys。
3. 編輯 synergy config file 來設定快速鍵
3-1. 使用 /usr/bin/synergys 來啟動 synergy, 不要使用 quicksynergy
3-2. Synergy的config檔位於 ~/.synergy.conf , 可修改其對應的熱鍵設定
3-3.以下是目前設定檔,參考用
section: screens section_center: section_left: end section: links section_center: left = section_left section_left: right = section_center end section: options keystroke(alt+KP_1) = switchToScreen(section_left) keystroke(alt+KP_2) = switchToScreen(section_center) end
KP_1為右方小鍵盤(KeyPad)數字鍵1, KP_2為右方小鍵盤(KeyPad)數字鍵2
所以只要按下alt + keypad_1 和 alt + keypad_2 即可切換不同螢幕,不必使用滑鼠移來移去了
注意:可使用的熱鍵大小寫有區別
更多的設定參考官網
可藉由 HideReturnsTransformationMethod 物件來轉換明碼 以及 PasswordTransformationMethod 物件來轉換成暗碼
建立物件後再呼叫 EditText 的 setTransformationMethod(), 傳入剛剛產生的物件即可完成轉換
Source Code
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity
{
private EditText mInputPassword;
private CheckBox mShowPassword;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initLayoutComponents();
}
private void initLayoutComponents()
{
mInputPassword = (EditText) findViewById(R.id.password);
mShowPassword = (CheckBox) findViewById(R.id.switchPassword);
mShowPassword.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
if (isChecked) {
mInputPassword.setTransformationMethod(new HideReturnsTransformationMethod());
} else {
mInputPassword.setTransformationMethod(new PasswordTransformationMethod());
}
}
});
}
}
第33行及35行即為轉換的過程
R.layout.activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.changepasswordtostar.MainActivity" >
<EditText
android:id="@+id/password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="@string/input_password_hint"
android:inputType="textPassword"/>
<CheckBox
android:id="@+id/switchPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/password"
android:layout_alignLeft="@+id/password"
android:text="@string/showPasswrod"/>
</RelativeLayout>
Root Caused:
Apk 佔用的記憶體大於 Device（或者模擬器上分配的記憶體）的記憶體
Solution:
1. 移除Device上的apk
2. 在Eclipse中將該專案clean, 然後auto build
3. 重新安裝到Device上
Activity 在預設的情況中按下選單鍵是沒有反應的, 要讓選單鍵產生作用相當簡單,只要注意以下兩點
1. 複寫 activity的 onCreateOptionsMenu 方法, 在方法中加入想要顯示的選單項目(MenuItem)
2. 複寫 activity的 onOptionsItemSelected 方法, 在方法中加入點選各選單項目(MenuItem)要對應的動作
實作程式碼如下
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity
{
public static final int ADD_ID = 0;
public static final int DELETE_ID = 1;
public static final int ABOUT_ID = 2;
public static final int EXIT_ID = 3;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
addMenuItems(menu);
return true;
}
private void addMenuItems(Menu menu)
{
menu.add(Menu.NONE, ADD_ID, Menu.NONE, R.string.menu_add);
menu.add(Menu.NONE, DELETE_ID, Menu.NONE, R.string.menu_delete);
menu.add(Menu.NONE, ABOUT_ID, Menu.NONE, R.string.menu_about);
menu.add(Menu.NONE, EXIT_ID, Menu.NONE, R.string.menu_exit);
}
public boolean onOptionsItemSelected(MenuItem item)
{
selectMenuItemEvents(item);
return super.onOptionsItemSelected(item);
}
private void selectMenuItemEvents(MenuItem item)
{
switch (item.getItemId()) {
case ADD_ID:
setTitle(getResources().getString(R.string.menu_add));
break;
case DELETE_ID:
setTitle(getResources().getString(R.string.menu_delete));
break;
case ABOUT_ID:
setTitle(getResources().getString(R.string.menu_about));
break;
case EXIT_ID:
break;
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
</LinearLayout>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">MENU</string>
<string name="menu_add">add item</string>
<string name="menu_delete">delete item</string>
<string name="menu_about">about</string>
<string name="menu_exit">exit</string>
<string name="menu_about_msg">message for about...</string>
<string name="str_ok">OK</string>
<string name="str_cancel">Cancel</string>
<string name="menu_exit_msg">exit system？</string>
</resources>
建立多重選單必須使用AlertDialog.Builder 來達成, 如下
package com.example.layout;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.os.Bundle;
import android.util.Log;
public class MultiChoiceItemsActivity extends Activity
{
protected static final String TAG = "MultiChoiceItemsActivity";
private String[] mItems = new String[] {
"item1", "item2", "item3", "item4", "item5"
};
private boolean[] mCheckItems = new boolean[mItems.length];
private void showAlertDialog()
{
Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Title");
builder.setMultiChoiceItems(mItems, mCheckItems, new OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog, int which, boolean isChecked)
{
if (isChecked) {
mCheckItems[which] = true;
}
}
});
builder.setNegativeButton("Negative", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which)
{
String checkItemsResult = "";
int checkItemslength = mCheckItems.length;
for (int i = 0; i < checkItemslength; ++i) {
if (mCheckItems[i]) {
checkItemsResult = checkItemsResult + mItems[i];
}
}
Log.d(TAG, checkItemsResult);
}
});
builder.show();
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_multi_choice_items);
showAlertDialog();
}
}
第17行為多重選項的內容
第21行為紀錄哪些選項被選擇
第27行設定多重選項並傳入顯示的選項內容
第32行藉由isChecked判斷哪些選項被勾選,並紀錄在mCheckItems中
第38行加入Button
第43~50行為顯示被勾選的選項
相反於此篇(使用ant手動產生unsign apk), 現在必須使用ant手動產生 sign apk, 以步驟為說明
Step1. Generate keystore by command
keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
Note：alias_name 為 key 名稱, 必須相同於Step3. 的alias_name, 10000為有效時間(天數),官方建議25年以上
執行後還需要填入相關訊息如下
輸入 keystore 密碼： xxxabcdefg 重新輸入新密碼: xxxabcdefg 您的名字與姓氏為何？ [Unknown]： test 您的編制單位名稱為何？ [Unknown]： test 您的組織名稱為何？ [Unknown]： test 您所在的城市或地區名稱為何？ [Unknown]： test 您所在的州及省份名稱為何？ [Unknown]： test 該單位的二字國碼為何 [Unknown]： test CN=test, OU=test, O=test, L=test, ST=test, C=test 正確嗎？ [否]： y 針對 CN=test, OU=test, O=test, L=test, ST=test, C=test 產生有效期為 10,000 天的 2,048 位元 RSA 金鑰對以及自我簽署憑證 (SHA1withRSA) 輸入 <alias_name> 的主密碼 （RETURN 如果和 keystore 密碼相同）：
完成後在當前目錄下會產生名稱為 my-release-key 的 keystore, 注意此keystore必須小心保存放在本機端
Step2. Create build.xml
(move to root folder of your project and type follow command)
android update project -p .
Note :
1.”android” means android tool at sdk, maybe need to indicate path like /android_sdk/tools/android
2. build.xml is for ant to build project
Step3. Create ant.properties and type follow content inside
(move to root folder of your project and type follow content)
key.store=/your-keystore-path/my-release-key.keystore key.alias=alias_name
Note:
1. alias_name must the same with Step1.
2. ant.properties be used by build.xml
Step4. Create custom_rules.xml
(move to root folder of your project and type follow content)
<?xml version="1.0" encoding="UTF-8"?> <project name="custom_rules" default="help"> <property file="/path_of_secure.properties/secure.properties" /> </project>
Note:
1. custom_rules.xml be used by build.xml
Step5. Create secure.properties reference follow content
key.store.password=xxxabcdefg key.alias.password=xxxabcdefg
Note:
1. password must equal to Step1. 的 “輸入 keystore 密碼”
2. path of secure.properties must the same with Step4. “/path_of_secure.properties/secure.properties”
3. this file maybe can put the same folder with my-release-key.keystore
Step6. type follow command
ant release
Note:
1. xxx-release.apk will be created at /project/bin/ when build process is success
2. build error :
/bin/AndroidManifest.xml:2: error: Error: String types not allowed (at ‘versionCode’ with value ‘${MAJOR_NUMBER}’).
solution:
Type normal string value e.g. “0” for vsersionCode and “0.1” for versionName at /bin/AndroidManifest.xml
Description:
Use Ant to build apk and show error message at Terminal
[aapt] invalid resource directory name: /project/bin/res/crunch
Root Caused:
Ant can’t handle crunch directory
Solution:
Move to root director of project and type follow command
ant clean debug
Root Caused:
sdk.dir is missing. Make sure to generate local.properties using ‘android update project’ or to inject it through the ANDROID_HOME environment variable.
Solution:
Move to root director of project and type follow command
android update project -p .