Support for versions earlier than 2.0 in android

 

Recently I wrote a mini game for android2.2. After I put it on google market, I found that some versions of Android 1.5 and Android 1.6 were downloaded. I put it on the simulator and found that none of them can be started. I checked the website for half a day and finally solved the problem. Write down and keep a record.

1. Modify the response method of the BACK key.

Before 2.0, the BACK key responds in onKeyDown.

After 2.0, the BACK key responds in onBackPressed.

To support systems earlier than 2.0, a function is directly added. A better way is to create a common parent class on top of all your own activities. In this case, it will be easier to modify.

Public boolean onKeyDown (int keyCode, KeyEvent event ){

// Back key

If (keyCode = KeyEvent. KEYCODE_BACK ){

OnBackPressed ();

}

Return super. onKeyDown (keyCode, event );

}

Note: Do not add the [@ Override] Comment on the onBackPressed method.

 

2. Modify the attribute value of filling the parent region in layout.

Before 2.0, It is fill_parent

Fill_parent and match_parent are supported after 2.0

So I renamed all of them [fill_parent].

 

3. Exception at startup

After the preceding two points are reached, the following exception will still be reported during startup in 1.5.

ERROR/AndroidRuntime (803): Caused by: java. io. FileNotFoundException: res/drawable/title_bar_shadow.9.png

It turns out that you only need to directly create a drawable directory under res and then test the required images. Upgrade title_bar_shadow.9.png.