问题描述
||
当我将所有东西都围绕Android 2.2 Froyo构建时，我将重新使用我之前使用的应用程序。
我已经为最新的API更新了我的SDK，并注意到不赞成使用我使用的ClipboardManager功能。我更新了代码以使用更新的ClipData模型，并在Froyo手机上对其进行了尝试，当然，在新代码中我收到了NoClassDefFoundError。
我已经看过SO了，还没有找到有关维护向后兼容性的通用策略的任何真正讨论。
我不确定要如何处理这种情况以及API不同的其他情况，因为我希望所有版本的用户都可以使用我的应用。
我应该做如下检查吗？
if(version == old){
use old API;
} else {
use new API;
}
解决方法
您可以执行此操作（检查API版本）。
您也可以使用反射来调用较新的类。
我不会担心使用不赞成使用的方法，因为所有Android版本都是向后兼容的，因为您要注意3.0 Honeycomb的使用情况，因为它们有点不同。
这是关于如何使用反射的说明：（是的，以前曾经在SO上使用过，所以也许搜索反射）
http://www.youtube.com/watch?v=zNmohaZYvPw&feature=player_detailpage#t=2087s
我正在考虑使该项目可用，但在此之前这里是一些代码：
（您可以在扩展Application的类中进行此操作，即一次性设置）
public static Method getExternalFilesDir;
static {
try {
Class<?> partypes[] = new Class[1];
partypes[0] = String.class;
getExternalFilesDir = Context.class.getMethod(\"getExternalFilesDir\",partypes);
} catch (NoSuchMethodException e) {
Log.e(TAG,\"getExternalFilesDir isn\'t available in this devices api\");
}
}
if(ClassThatExtendsApplication.getExternalFilesDir != null){
Object arglist[] = new Object[1];
arglist[0] = null;
File path = (File) ClassThatExtendsApplication.getExternalFilesDir.invoke(context,arglist);
// etc etc
} else {
// Not available do something else (like your deprecated methods / or load a different class / or notify they should get a newer version of Android to enhance your app ;-))
}
@SuppressWarnings(\"deprecation\")
/**
* Interface used to interact with the actual instance of MessageManager.
* This inteface allows will be the type of the reference that will point
* to the actual MessageMessenger,which will be loaded dynamically.
* @author steff
*
*/
public abstract class MessageManager {
/** Request code used to identify mail messages.*/
public final static int FOR_MAIL = 0x3689;
/** Request code used to identify SMS messages.*/
public final static int FOR_SMS = 0x3698;
/**
* Start an activity inside the given context. It will allow to pickup a contact
* and will be given an intent code to get contact pick up.
* *@param the request code. Has to be a constant : FOR_MAIL or FOR_SMS
*/
public abstract void pickupContact(int code);//met
/**
* Start an activity inside the given context. It will allow to pickup a contact
* and will be given an intent code to get contact pick up.
* *@param the request code. Has to be a constant : FOR_MAIL or FOR_SMS
*/
public abstract void sendMessage(int code,Intent data,final String body);//met
/**
* Static methode used as in factory design pattern to create an instance
* of messageManager. Here it is combined with the singleton pattern to
* get an instance of an inherited class that is supported by current android SDK.
* This singleton will be created bu reflexion.
* @param activity the activity that needs messaging capabilities.
* @return an instance of an inherited class that is supported by current android SDK or null,if not found.
*/
public static MessageManager getInstance( Activity activity )
{
MessageManager instance = null;
try {
Class<? extends MessageManager> messageManagerClass = (Class<? extends MessageManager>) activity.getClassLoader().loadClass( \"ca.qc.webalterpraxis.cinedroid.message.MessageManagerSDK7\" );
Method singletonMethod = messageManagerClass.getMethod(\"getInstance\",Activity.class );
instance = (MessageManager) singletonMethod.invoke( null,activity);
} catch (Throwable e) {
Log.e( \"CinemadroidMain\",\"Impossible to get an instance of class MessageManagerSDK7\",e );
}//met
return instance;
}//met
}//interface
public class MessageManagerSDK7 extends MessageManager {
/** Used for logcat. */
private static final String LOG_TAG = \"MessageManagerSDK7\";
/** Singleton instance. */
private static MessageManagerSDK7 instance = null;
/** Activity that will call messaging actions. */
private Activity context;
/** Private constructor for singleton. */
private MessageManagerSDK7( Activity context )
{
if( instance != null )
throw new RuntimeException( \"Should not be called twice. Singleton class.\");
this.context = context;
}//cons
/**
* Static method that will be called by reflexion;
* @param context the activity that will enclose the call for messaging.
* @return an instance of this class (if class loader allows it).
*/
public static MessageManagerSDK7 getInstance( Activity context )
{
if( instance == null )
instance = new MessageManagerSDK7( context );
instance.context = context;
return instance;
}//met
/* (non-Javadoc)
* @see ca.qc.webalterpraxis.cinedroid.model.MessageManager#pickupContact(int)
*/
@Override
public void pickupContact( int code )
{
if( code != FOR_MAIL && code != FOR_SMS )
throw new RuntimeException( \"Wrong request code,has to be either FOR_MAIL or FOR_SMS.\");
Intent intentContact = new Intent(Intent.ACTION_PICK,ContactsContract.Contacts.CONTENT_URI);
context.startActivityForResult(intentContact,code );
}//met
/* (non-Javadoc)
* @see ca.qc.webalterpraxis.cinedroid.model.MessageManager#sendMessage(int,android.content.Intent,java.lang.String)
*/
@Override
public void sendMessage( int code,final String body )
{
//System.out.println( \"SendMessage\");
if( code != FOR_MAIL && code != FOR_SMS )
throw new RuntimeException( \"Wrong request code,has to be either FOR_MAIL or FOR_SMS.\");
int icon = 0;
int noItemMessage = 0;
int title = 0;
//set the right icon and message for the dialog
if( code == FOR_MAIL )
{
icon=R.drawable.mail;
noItemMessage = R.string.no_email_found;
title = R.string.mail_error;
}//if
else if( code == FOR_SMS )
{
icon=R.drawable.sms;
noItemMessage = R.string.no_number_found;
title = R.string.sms_error;
}//if
//compose email or sms
//pick contact email address
final String[] emailsOrPhoneNumbers = (code == FOR_MAIL ) ? getContactsEmails( data ) : getContactPhoneNumber( data );
if( emailsOrPhoneNumbers == null )
{
new AlertDialog.Builder( context ).setIcon( icon ).setTitle(title).setMessage( noItemMessage ).show();
return;
}//if
//in case there are several addresses,we handle this using a dialog.
//modal dialog would be usefull but it\'s bad UI practice
//so we use an alert dialog,async ..
//all this is poorly coded but not very interesting,not worth having a dedicated inner class
if( emailsOrPhoneNumbers.length > 1 )
{
selectMultipleAndSend( emailsOrPhoneNumbers,body,code);
return;
}//if
if( code == FOR_MAIL )
sendMail( emailsOrPhoneNumbers,body );
else
sendSMS( emailsOrPhoneNumbers,body );
}//met
private void sendMail( String[] emails,String body )
{
if( body == null )
{
new AlertDialog.Builder( context ).setIcon( R.drawable.mail ).setTitle(R.string.mail_error).setMessage( R.string.impossible_compose_message ).show();
return;
}//if
//prepare email data
try {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType(\"message/rfc822\") ;
i.putExtra(Intent.EXTRA_EMAIL,emails );
//i.putExtra(Intent.EXTRA_EMAIL,emails);
i.putExtra(Intent.EXTRA_SUBJECT,context.getString( R.string.showtimes ) );
i.putExtra(Intent.EXTRA_TEXT,body);
context.startActivity(Intent.createChooser(i,context.getString( R.string.select_application ) ) );
} catch (Throwable e) {
new AlertDialog.Builder( context ).setIcon( R.drawable.mail ).setTitle(R.string.mail_error).setMessage( R.string.no_application_mail ).show();
Log.e( LOG_TAG,\"No application found\",e);
}//catch
}//met
private void sendSMS( String[] phoneNumbers,String body )
{
try {
Intent sendIntent= new Intent(Intent.ACTION_VIEW);
if( body == null )
{
new AlertDialog.Builder( context ).setIcon( R.drawable.sms ).setTitle(R.string.sms_error).setMessage( R.string.impossible_compose_message ).show();
return;
}//if
sendIntent.putExtra(\"sms_body\",body);
String phones = \"\";
for( String phoneNumber : phoneNumbers )
phones += ((phones.length() == 0) ? \"\" : \";\") + phoneNumber;
sendIntent.putExtra(\"address\",phones );
sendIntent.setType(\"vnd.android-dir/mms-sms\");
context.startActivity(sendIntent);
} catch (Throwable e) {
new AlertDialog.Builder( context ).setIcon( R.drawable.sms ).setTitle(R.string.sms_error).setMessage( R.string.no_application_sms ).show();
Log.e( LOG_TAG,e);
}//catch
}//met
/**
* @param intent the intent returned by the pick contact activity
* @return the emails of selected people,separated by a comma or null if no emails has been found;
*/
protected String[] getContactsEmails(Intent intent)
{
List<String> resultList = new ArrayList<String>();
//http://stackoverflow.com/questions/866769/how-to-call-android-contacts-list
Cursor cursor = context.managedQuery(intent.getData(),null,null);
while (cursor.moveToNext())
{
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
// Find Email Addresses
Cursor emails = context.getContentResolver().query(ContactsContract.CommonDataKinds.Email.CONTENT_URI,ContactsContract.CommonDataKinds.Email.CONTACT_ID + \" = \" + contactId,null);
while (emails.moveToNext())
{
resultList.add( emails.getString(emails.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA)) );
}//while
emails.close();
} //while (cursor.moveToNext())
cursor.close();
if( resultList.size() == 0 )
return null;
else
return resultList.toArray( new String[ resultList.size() ] );
}//met
/**
* @param intent the intent returned by the pick contact activity
* @return the phoneNumber of selected people,separated by a comma or null if no phoneNumber has been found;
*/
protected String[] getContactPhoneNumber(Intent intent)
{
List<String> resultList = new ArrayList<String>();
//http://stackoverflow.com/questions/866769/how-to-call-android-contacts-list
Cursor cursor = context.managedQuery(intent.getData(),null);
while (cursor.moveToNext())
{
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
String name = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Contacts.DISPLAY_NAME));
String hasPhone = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));
if ( hasPhone.equalsIgnoreCase(\"1\"))
hasPhone = \"true\";
else
hasPhone = \"false\" ;
if (Boolean.parseBoolean(hasPhone))
{
Cursor phones = context.getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,ContactsContract.CommonDataKinds.Phone.CONTACT_ID +\" = \"+ contactId,null);
while (phones.moveToNext())
{
resultList.add( phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)) );
}
phones.close();
}
} //while (cursor.moveToNext())
cursor.close();
if( resultList.size() == 0 )
return null;
else
return resultList.toArray( new String[ resultList.size() ] );
}//met
private void selectMultipleAndSend( final String[] emailsOrPhoneNumbers,final String body,final int code )
{
int icon = 0;
int selectMessage = 0;
//set the right icon and message for the dialog
if( code == FOR_MAIL )
{
icon=R.drawable.mail;
selectMessage = R.string.select_email;
}//if
else if( code == FOR_SMS )
{
icon=R.drawable.sms;
selectMessage = R.string.select_phone;
}//if
final boolean[] selected = new boolean[ emailsOrPhoneNumbers.length ];
Arrays.fill( selected,true );
new AlertDialog.Builder( context ).setIcon( icon ).setTitle( selectMessage ).setMultiChoiceItems(emailsOrPhoneNumbers,selected,new OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog,int which,boolean isChecked) {
selected[ which ] = isChecked;
}
}).setPositiveButton( R.string.OK,new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
int count = 0;
for( int s=0; s< selected.length; s ++ )
if( selected[s] )
count ++;
String[] selectedEmailsOrPhoneNumbers = new String[ count ];
int index = 0;
for( int s=0; s< selected.length; s ++ )
if( selected[s] )
selectedEmailsOrPhoneNumbers[ index ++ ] = emailsOrPhoneNumbers[ s ];
if( code == FOR_MAIL )
sendMail( selectedEmailsOrPhoneNumbers,body );
else if( code == FOR_SMS )
sendSMS( selectedEmailsOrPhoneNumbers,body );
}
}).setNegativeButton( R.string.cancel,null ).show();
}//met
}//class
MessageManager messageManager = MessageManager.getInstance( this );
import android.os.Build;
public static int getWidth(Context mContext){
int width=0;
WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
if(VERSION.SDK_INT > VERSION_CODES.HONEYCOMB){
Point size = new Point();
display.getSize(size);
width = size.x;
}
else{
width = display.getWidth(); // deprecated,use only in Android OS<3.0.
}
return width;
}
if(VERSION.SDK_INT > VERSION_CODES.HONEYCOMB){
Point size = new Point();
display.getSize(size);
width = size.x;
}
if(VERSION.SDK_INT > VERSION_CODES.JELLY_BEAN){
Point size = new Point();
display.getSize(size);
width = size.x;
}