软件应用教程

Android m5到0.9版之间API改变分析 Android开发技术

Android m5到0.9版之间API改变分析 Android开发技术

在最新的Android SDK 0.9版中很多地方都有了改变,涉及改变的API我们已经在Android移植栏目中介绍到,下面以更详细的代码实例形式介绍,不断更新增加: (比如IntentReceiver改名为BroadcastReceiver这种更合适的名称),我们看到Android 0.9 SDK中API的变化在改变上主要是命名方式更准确,实现过程改变不是很多。

IntentReceiver renamed to BroadcastReceiver


Detailed Problem Description:

For example, if you have a IntentReceiver class name MyReceiver..

In AndroidManifest.xml

Error: MyReceiver does not extend android.context.BroadcastReceiver

In MyReceiver class defination

Error: Cannot resolve type IntentReceiver

Solution:

replace

import android.content.IntentReceiver;

public class MyReceiver extends IntentReceiver
{
    @Override
    public void onReceiveIntent(Context context, Intent intent)
    {
    }

}

with
import android.content.BroadcastReceiver;

 

public class MyReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
    }

}

Notes:

onFreeze() renamed to onSaveInstanceState()

Detailed Problem Description:

replace

@Override
protected void onFreeze(Bundle outState) {
super.onFreeze(outState);
}

Solution:

with

@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}

Notes:

 

startSubActivity() renamed to startActivityForResult()

Detailed Problem Description:

replace

Intent i = new Intent(this, NoteEdit.class);
i.putExtra(NotesDbAdapter.KEY_ROWID, id);
startSubActivity(i, ACTIVITY_EDIT);


Solution:

with

Intent i = new Intent(this, NoteEdit.class);
i.putExtra(NotesDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY__EDIT);

Notes:

Limits on resources available to application

Detailed Problem Description:

Error: Resource is not public..
Some resources have been made private in the latest release..
Only resources needed for application development are left public.

Solution:

Check the public resources @ docs/reference/android/package-summary.html

Notes:

 

Layout attributes renamed

Detailed Problem Description:

Some xml attributes are renamed, removed..and new attributes are added.

Solution:

Use the new auto-complete feature in Eclipse for yourlayout.xml files
and choose from the available attributes. Use the new layout editor
(the first tab when you click on your layout xml files )
to debug and check your views/layouts.

Notes:

Integer types not allowed at layout_xxx,spacing,padding,etc

Detailed Problem Description:

It is required to specify the unit of measurement for layout attributes.
Only numeric values are no longer enough, you will receive an error
indicating "Integer types not allowed"

Solution:

Specify unit..
For example:
replace
<View layout_width="10" />
with
<View layout_width="10dp" />

Notes:

MapView crashes

Detailed Problem Description:

You will notice the following errors while using MapView:

1) ClassNotFound exceptions while using MapView.

2) java.lang.IllegalArgumentException: You need to specify an API Key for each MapView

Solution:

For one, Maps API have now been moved into their own separate shared library.

Add the following tag to your AndroidManifest.xml to fix this issue:

<uses-library android:name="com.google.android.maps" />        

For the second issue, you will now need a Api key to use MapView, for now
it can be any random string. Add android:apiKey="apisamples"
attribute to you MapView tag in layout xml file.

Notes:

See ApiDemos -> view/MapViewDemo sample code.

Cannot re-install ApiDemos

Detailed Problem Description:

You will notice a signing error when you try to re-install ApiDemos for the first time.

Solution:

Refer to:
http://code.google.com/android/kb/troubleshooting.html#apidemosreinstall

Notes:

requestUpdates() is undefined for LocationManager

Detailed Problem Description:

The LocationManager class does not fire Location update Intents. The
requestUpdates method has been removed. For using mock LocationProviders ,
you can no longer provide canned LocationProviders
in the /system/etc/location directory

Solution:

The LocationManager class now notifies LocationListener objects of
location and status changes, rather than firing Intents. The
requestUpdates method has been renamed to requestLocationUpdates and
now takes a LocationListener object rather than an Intent. A new
requestStatusUpdates method has been added, also taking a
LocationListener object. The removeUpdates method now takes a
LocationListener object.

Notes:

For more information refer to:
http://code.google.com/android/toolbox/apis/lbs.html

A sample app for using Location Apis can be found in the files section in
android-developer forums.

 

Cursor.putXxx() and Activity.managedCommitUpdates() are deprecated

Detailed Problem Description:

You will notice that the Cursor.putXxx() methods and the Activity.managedCommitUpdates() are deprecated.

Solution:

replace with calls to ContentResolver:

ContentValues values = new ContentValues();
values.put(Notes.MODIFIED_DATE, System.currentTimeMillis());
values.put(Notes.TITLE, title);
values.put(Notes.NOTE, text);
// Commit all of our changes to persistent storage. When the update completes
// the content provider will notify the cursor of the change, which will
// cause the UI to be updated.
getContentResolver().update(mUri, values, null, null);

Notes:

See NoteEditor.java in the NotePad sample for an example of usage.

 

Menu.Item renamed to Menu.MenuItem

Detailed Problem Description:

replace:
public boolean onOptionsItemSelected(Menu.Item item) {
        switch (item.getId()) {
        …..

Solution:

with:

public boolean onOptionsItemSelected(Menu.MenuItem item) {
        switch (item.getItemId()) {
        …..

Notes:

Also, menu.add() methods now take new parameter "order"

setResult() now takes Intent instead of string

Detailed Problem Description:

replace:
1) setResult(RESULT_OK, "Corky!");

2) protected void onActivityResult(int requestCode, int resultCode,
        String data, Bundle extras) {
         …..
    }

Solution:

with:

1) Bundle bundle = new Bundle();
    bundle.putString(TEST_STRING, "Corky!");
    Intent mIntent = new Intent();
    mIntent.putExtras(bundle);
    setResult(RESULT_OK, mIntent);

2) protected void onActivityResult(int requestCode, int resultCode,
        Intent data) {
        …..
    }

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