Hank to hanker - Learning Note: Android

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2012年5月16日星期三

[Android] repack System Image after compile

Emulator 執行時會自動讀取img檔, 但是如果修改程式後不會自動安裝到emulator中

所以要repack image, 重新讀取新的img檔

2012年5月9日星期三

[Android] Run Android 4.0.4 compiled android source build system on emulator

// set ANDROID_PRODUCT_OUT to environment
$ export ANDROID_PRODUCT_OUT="/android/out/target/product/generic"

// execute emulator

$ ./out/host/linux-x86/bin/emulator

[Android] 解決 Ubuntu 11.10 編譯Android 4.0.4 錯誤 - Solve Compile Android 4.0.4 failed on Ubuntu 11.10

在Ubuntu 11.10 Compile Android 4.0.4 時會有這個錯誤

make: *** [out/host/linux-x86/obj/EXECUTABLES/obbtool_intermediates/Main.o] Error 1
make: *** Waiting for unfinished jobs....
<command-line>:0:0: warning: "_FORTIFY_SOURCE" redefined [enabled by default]
<built-in>:0:0: note: this is the location of the previous definition

後來發現是gcc版本4.6.1導致的問題, 降到4.4就可以
降的方法就是把gcc-4.4設成預設在bin裡面, 可以藉由檢查$PATH, 知道bin的優先順序
像我是有在家目錄另外開一個bin (~/bin), 然後擺在$PATH的第一個
所以我只要把gcc跟g++ link到~/bin裡

$ ln -s /usr/bin/gcc-4.4 ~/bin/gcc
$ ln -s /usr/bin/gcc-4.4 ~/bin/cc
$ ln -s /usr/bin/g++-4.4 ~/bin/g++
$ ln -s /usr/bin/g++-4.4 ~/bin/c++

// 檢查版本
$ gcc -v
$ g++ -v

如果你的電腦沒有4.4版就要透過apt-get另外安裝
$ sudo apt-get install gcc-4.4 g++-4.4 gcc-4.4-multilib

2010年11月12日星期五

[Android] 預設開啟Menu選單 openOptionsMenu

在Activity加上onAttachedToWindow() 方法

public void onAttachedToWindow() {
  super.onAttachedToWindow();
  openOptionsMenu();
}

2010年11月10日星期三

[Android] Conversion to Dalvik format failed with error 1 解決方法

今天Eclipse的Console突然出現一堆錯誤訊息都是
Conversion to Dalvik format failed with error 1

解決方法

1. 選取所有的Project

2. 點選單列的Project -> Clean

3. 選Clean All Projects, 然後按OK就解決了!

可能有其他情況會出現一樣的錯誤, 如果這成功/不成功解決你的問題, 請讓我知道 :) thanks

2010年11月8日星期一

[Android] 將ImageButton背景設為透明

左邊透明, 右邊是一般

我發現設為透明最快的方法, 就是設為@null：

<ImageButton android:id="@+id/ImageButton01"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/normal"
  android:background="@null"
  />

在網路上看到有人說
透明是#00000000
半透明是#e0000000
不過目前我試不出半透明跟透明差在哪= ="

[Android] Activity Lifecycles 生命週期

執行App時: OnCreate() -> OnStart() -> OnResume()
結束App時: OnPause() -> OnStop() -> OnDestroy()
Finish() -> OnPause() -> OnStop() -> OnDestroy()
暫停App時: OnPause() -> OnStpop()
重啟App時: OnRestart() -> OnStart() -> OnResume()

以下是測試程式 (使用Toast顯示文字):

package com.demo.activitycycle;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

public class ActivityLifeCycle extends Activity {

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.main);
     Toast.makeText(this, "OnCreate()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onDestroy() {
  super.onDestroy();
  Toast.makeText(this, "OnDestroy()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onPause() {
  super.onPause();
  Toast.makeText(this, "OnPause()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onRestart() {
  super.onRestart();
  Toast.makeText(this, "OnRestart()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onResume() {
  super.onResume();
  Toast.makeText(this, "OnResume()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onStart() {
  super.onStart();
  Toast.makeText(this, "OnStart()", Toast.LENGTH_SHORT).show();
 }

 @Override
 protected void onStop() {
  super.onStop();
  Toast.makeText(this, "OnStop()", Toast.LENGTH_SHORT).show();
 }
}

Reference:
http://developer.android.com/guide/topics/fundamentals.html#lcycles
http://developer.android.com/reference/android/widget/Toast.html

[Android] ADB常用指令

adb [-d | -e | -s <serialNumber>] <command>

-d 是送到USB的實際連接設備
-e 是只送到模擬器

如果執行複數個模擬器, 就要用serialNumber來區別
-s <serialnumber>

安裝或移除apk

install安裝後面接的參數是apk的檔案路徑名稱
uninstall移除後面接的參數是package name
ex:

adb -s emulator-5554 install helloworld.apk
adb uninstall com.myandroid.helloworld

偵測設備資訊

# List of devices attached
adb devices 

# device(運作中), offline(離線), bootloader(開機中)
adb get-state

# 取得執行模擬器的序號
adb get-serialno

進入shell命令列模式

指令跟Linux一樣

adb shell
# ls /data/data
# ls /data/app

2010年11月5日星期五

[Android] HTC Desire 開發機環境設置

安裝Android SDK

http://developer.android.com/sdk/index.html

安裝HTC Sync

http://www.htc.com/tw/support.aspx

USB連線類型選HTC Sync

手機設定：

設定->應用程式

未知的來源 -> 打勾
開發 -> 除錯 -> 打勾

2009年6月5日星期五

[Android] Android Architecture

Applications
- All applications are written using the Java programming language.
Application Framework
- Developers have full access to the same framework APIs used by the core applications. The application architecture is designed to simplify the reuse of components
Libraries
- System C library - a BSD-derived implementation of the standard C system library (libc), tuned for embedded Linux-based devices
- Media Libraries - based on PacketVideo's OpenCORE; the libraries support playback and recording of many popular audio and video formats, as well as static image files, including MPEG4, H.264, MP3, AAC, AMR, JPG, and PNG
- Surface Manager - manages access to the display subsystem and seamlessly composites 2D and 3D graphic layers from multiple applications
- LibWebCore - a modern web browser engine which powers both the Android browser and an embeddable web view
- SGL - the underlying 2D graphics engine
- 3D libraries - an implementation based on OpenGL ES 1.0 APIs; the libraries use either hardware 3D acceleration (where available) or the included, highly optimized 3D software rasterizer
- FreeType - bitmap and vector font rendering
- SQLite - a powerful and lightweight relational database engine available to all applications
Android Runtime
- Every Android application runs in its own process, with its own instance of the Dalvik virtual machine.
- The Dalvik VM relies on the Linux kernel for underlying functionality such as threading and low-level memory management.
Linux Kernel
- Android relies on Linux version 2.6 for core system services such as security, memory management, process management, network stack, and driver model.