Android
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Installation
I just installed the SDK from the android web site. Then I installed a 2.1 target with the Android graphical tool (just type 'android' in a shell).
note: if you want to try using Eclipse en Debian or Ubuntu start it with 'eclipse -vmargs -Djava.net.preferIPv4Stack=true'
Configuration
I added two functions in my ~/.bashrc to define the environment for Android:
andoid_begin() {
export OLDPATH=${PATH}
export PATH=/home/ggl/src/android/android-sdk-linux_86/tools:${PATH}
}
android_end() {
export PATH=${OLDPATH}
}
After that:
$ android_begin
$ android list
Available Android targets:
id: 1 or "android-7"
Name: Android 2.1
Type: Platform
API level: 7
Revision: 1
Skins: WQVGA400, QVGA, WQVGA432, WVGA800, WVGA854, HVGA (default)
Available Android Virtual Devices:
$ android create avd --target 1 --name test_target0
Android 2.1 is a basic Android platform.
Do you wish to create a custom hardware profile [no]
Created AVD 'test_target0' based on Android 2.1, with the following hardware config:
hw.lcd.density=160
Create a project
$ android create project --target 1 --name hello --path ~/code/android/hello --activity HelloActivity --package com.example.greg.hello Created project directory: /home/ggl/code/android/hello Created directory /home/ggl/code/android/hello/src/com/example/greg/hello Added file /home/ggl/code/android/hello/src/com/example/greg/hello/HelloActivity.java Created directory /home/ggl/code/android/hello/res Created directory /home/ggl/code/android/hello/bin Created directory /home/ggl/code/android/hello/libs Created directory /home/ggl/code/android/hello/res/values Added file /home/ggl/code/android/hello/res/values/strings.xml Created directory /home/ggl/code/android/hello/res/layout Added file /home/ggl/code/android/hello/res/layout/main.xml Created directory /home/ggl/code/android/hello/res/drawable-hdpi Created directory /home/ggl/code/android/hello/res/drawable-mdpi Created directory /home/ggl/code/android/hello/res/drawable-ldpi Added file /home/ggl/code/android/hello/AndroidManifest.xml Added file /home/ggl/code/android/hello/build.xml
I copy the file from the hello example in ~/code/android/hello/HelloActivity.java: package com.example.helloandroid;
import android.app.Activity;
import android.os.Bundle;
public class HelloAndroid extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
Update the project
$ android update project --target 1 --name hello --path ~/code/android/hello Updated default.properties Updated local.properties File build.xml is too old and needs to be updated. Updated file /home/ggl/code/android/hello/build.xml
Build the project
You can simply build the useless empty project from its templates:
$ ant debug
Buildfile: /home/ggl/code/android/hello/build.xml
[setup] Project Target: Android 2.1
[setup] API level: 7
[setup] WARNING: No minSdkVersion value set. Application will install on all Android versions.
-compile-tested-if-test:
-dirs:
[echo] Creating output directories if needed...
[mkdir] Created dir: /home/ggl/code/android/hello/gen
[mkdir] Created dir: /home/ggl/code/android/hello/bin/classes
-resource-src:
[echo] Generating R.java / Manifest.java from the resources...
-aidl:
[echo] Compiling aidl files into Java classes...
compile:
[javac] /home/ggl/src/android/android-sdk-linux_86/platforms/android-7/templates/android_rules.xml:248: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
[javac] Compiling 2 source files to /home/ggl/code/android/hello/bin/classes
-dex:
[echo] Converting compiled files and external libraries into /home/ggl/code/android/hello/bin/classes.dex...
[echo]
-package-resources:
[echo] Packaging resources
[aaptexec] Creating full resource package...
-package-debug-sign:
[apkbuilder] Creating hello-debug-unaligned.apk and signing it with a debug key...
[apkbuilder] Using keystore: /home/ggl/.android/debug.keystore
debug:
[echo] Running zip align on final apk...
[echo] Debug Package: /home/ggl/code/android/hello/bin/hello-debug.apk
BUILD SUCCESSFUL
Total time: 8 seconds
Start the binary in the emulator
$ android list avd
Available Android Virtual Devices:
Name: test_target0
Path: /home/ggl/.android/avd/test_target0.avd
Target: Android 2.1 (API level 7)
Skin: HVGA
$ emulator -avd test_target0
$ adb install ~/code/android/hello/bin/hello-debug.apk
* daemon not running. starting it now *
* daemon started successfully *
error: device offline
$ adb install ~/code/android/hello/bin/hello-debug.apk
220 KB/s (13358 bytes in 0.059s)
pkg: /data/local/tmp/hello-debug.apk
Success
The '-r' switch reinstalls the application. We may use it after a having modified it:
$ adb install -r ~/code/android/hello/bin/hello-debug.apk
190 KB/s (13320 bytes in 0.068s)
pkg: /data/local/tmp/hello-debug.apk
Success
Using resources
We applied these modification in order to use resources instead of values in the java code:
$ git diff
diff --git a/res/layout/main.xml b/res/layout/main.xml
index 46a2900..5f4c383 100644
--- a/res/layout/main.xml
+++ b/res/layout/main.xml
@@ -7,7 +7,7 @@
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
- android:text="Hello World, HelloActivity"
+ android:text="@string/hello"
/>
</LinearLayout>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 0a80762..9b2b7ed 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1,4 +1,5 @@
<?xml version="1.0" encoding="utf-8"?>
<resources>
- <string name="app_name">HelloActivity</string>
+ <string name="app_name">My Hello Android!</string>
+ <string name="hello">Hello Android! It\'s great :)</string>
</resources>
diff --git a/src/com/example/greg/hello/HelloActivity.java b/src/com/example/greg/hello/HelloActivity.java
index f311334..ede11ce 100644
--- a/src/com/example/greg/hello/HelloActivity.java
+++ b/src/com/example/greg/hello/HelloActivity.java
@@ -2,7 +2,6 @@ package com.example.greg.hello;
import android.app.Activity;
import android.os.Bundle;
-import android.widget.TextView;
public class HelloActivity extends Activity
{
@@ -12,8 +11,5 @@ public class HelloActivity extends Activity
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
- TextView tv = new TextView(this);
- tv.setText("Hello, Android");
- setContentView(tv);
}
}
