Ant not rebuilding Android application with `ant debug install`

Starting with a clean project created with:

android create project -n something -t android-7 -p something -k com.example.something -a Something

When I run ant debug install and open the application in my emulator, I see (as expected)

Here's where it goes bad. I now change something trivial in the application. In this example, I'm going to remove the setContentView call from the main activity so it looks like this:

package com.example.something;

import android.app.Activity;

import android.os.Bundle;

public class Something extends Activity {

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //setContentView(R.layout.main);   REMOVED

    }

}

Now I rebuild the application with ant debug install and run it in the emulator. I see this:

This is wrong. I just removed the text with my previous edit. If I do ant clean before ant debug install , I get the expected result:

I don't want to have to run ant clean before each time I run ant debug install . How can I make ant actually rebuild the program without running ant clean each time?

---

Details:

Here's the output from the inital ant debug install :

$ ant debug install

Buildfile: /home/x/android/something/build.xml



-set-mode-check:



-set-debug-files:



-set-debug-mode:



-debug-obfuscation-check:



-setup:

     [echo] Gathering info for something...

    [setup] Android SDK Tools Revision 16

    [setup] Project Target: Android 2.1

    [setup] API level: 7

    [setup] 

    [setup] ------------------

    [setup] Resolving library dependencies:

    [setup] No library dependencies.

    [setup] 

    [setup] ------------------

    [setup] 

    [setup] WARNING: No minSdkVersion value set. Application will install on all Android versions.



-build-setup:

     [echo] Creating output directories if needed...

    [mkdir] Created dir: /home/x/android/something/bin

    [mkdir] Created dir: /home/x/android/something/bin/res

    [mkdir] Created dir: /home/x/android/something/gen

    [mkdir] Created dir: /home/x/android/something/bin/classes



-pre-build:



-code-gen:

     [echo] ----------

     [echo] Handling aidl files...

     [aidl] No AIDL files to compile.

     [echo] ----------

     [echo] Handling RenderScript files...

[renderscript] No RenderScript files to compile.

     [echo] ----------

     [echo] Handling Resources...

     [aapt] Generating resource IDs...



-pre-compile:



-compile:

    [javac] Compiling 2 source files to /home/x/android/something/bin/classes



-post-compile:



-obfuscate:



-dex:

      [dex] Converting compiled files and external libraries into /home/x/android/something/bin/classes.dex...



-crunch:

   [crunch] Crunching PNG Files in source dir: /home/x/android/something/res

   [crunch] To destination dir: /home/x/android/something/bin/res

   [crunch] Crunched 0 PNG files to update cache



-package-resources:

     [aapt] Creating full resource package...



-package:

[apkbuilder] Current build type is different than previous build: forced apkbuilder run.

[apkbuilder] Creating something-debug-unaligned.apk and signing it with a debug key...



-do-debug:

 [zipalign] Running zip align on final apk...

     [echo] Debug Package: /home/x/android/something/bin/something-debug.apk



debug:

[propertyfile] Creating new property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop



install:

     [echo] Installing /home/x/android/something/bin/something-debug.apk onto default emulator or device...

     [exec] 66 KB/s (4410 bytes in 0.065s)

     [exec]     pkg: /data/local/tmp/something-debug.apk

     [exec] Success



BUILD SUCCESSFUL

Total time: 5 seconds

Here's the output from the second ant debug install after the edit:

$ ant debug install

Buildfile: /home/x/android/something/build.xml



-set-mode-check:



-set-debug-files:



-set-debug-mode:



-debug-obfuscation-check:



-setup:

     [echo] Gathering info for something...

    [setup] Android SDK Tools Revision 16

    [setup] Project Target: Android 2.1

    [setup] API level: 7

    [setup] 

    [setup] ------------------

    [setup] Resolving library dependencies:

    [setup] No library dependencies.

    [setup] 

    [setup] ------------------

    [setup] 

    [setup] WARNING: No minSdkVersion value set. Application will install on all Android versions.



-build-setup:

     [echo] Creating output directories if needed...



-pre-build:



-code-gen:

     [echo] ----------

     [echo] Handling aidl files...

     [aidl] No AIDL files to compile.

     [echo] ----------

     [echo] Handling RenderScript files...

[renderscript] No RenderScript files to compile.

     [echo] ----------

     [echo] Handling Resources...

     [aapt] No changed resources. R.java and Manifest.java untouched.



-pre-compile:



-compile:

    [javac] Compiling 1 source file to /home/x/android/something/bin/classes



-post-compile:



-obfuscate:



-dex:

      [dex] No new compiled code. No need to convert bytecode to dalvik format.



-crunch:

   [crunch] Crunching PNG Files in source dir: /home/x/android/something/res

   [crunch] To destination dir: /home/x/android/something/bin/res

   [crunch] Crunched 0 PNG files to update cache



-package-resources:

     [aapt] No changed resources or assets. something.ap_ remains untouched



-package:

[apkbuilder] No changes. No need to create apk.



-do-debug:

 [zipalign] No changes. No need to run zip-align on the apk.

     [echo] Debug Package: /home/x/android/something/bin/something-debug.apk



debug:

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop

[propertyfile] Updating property file: /home/x/android/something/bin/build.prop



install:

     [echo] Installing /home/x/android/something/bin/something-debug.apk onto default emulator or device...

     [exec] 88 KB/s (4410 bytes in 0.048s)

     [exec]     pkg: /data/local/tmp/something-debug.apk

     [exec] Success



BUILD SUCCESSFUL

Total time: 3 seconds

Notice that the -dex , -package , and -debug steps all seem to think that I didn't change anything.

Source: Tips4all