Thanks P.T. for what looks like the correct answer to question Building multi-SDK Android apps in Eclipse without losing compile-time checks. However, when I try to use the @TargetApi() annotation as recommended, it generates syntax errors.
@TargetApi(11) // location 1
public class DisplayMessageActivity extends Activity {
@Override
@TargetApi(11) // location 2
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
@TargetApi(11) // location 3
getActionBar().setDisplayHomeAsUpEnabled(true); }
generates two syntax errors on the @TargetApi line when it is in the middle of the code as shown at location 3:
x Syntax error, insert "enum Identifier" to complete EnumHeaderName
x Syntax error, insert "enumBody" to complete BlockStatements
The errors exist whether I have the @TargetApi
line before the if
statement or after it as shown. Are there any prerequisites (imports) or other considerations not mentioned in the Lint API Check
article http://tools.android.com/recent/lintapicheck to get @TargetApi() working correctly?
--- Edit 9/3/2012 ---
If I move the @TargetApi annotation to before the class definition (shown as location 1) or before the method definition (shown as location 2, either before or after the @Override annotation), I get different errors:
x TargetApi cannot be resolved to a type
x The attribute value is undefined for the annotation type TargetApi
--- Edit 9/4/2012 ---
Here is the full source code:
package com.example.my.first.app;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class DisplayMessageActivity extends Activity {
@TargetApi(11)
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ActionBar introduced in Android 3.0 Honeycomb API 11
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true); } // Up Navigation
// Get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_display_message, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
FizzBuzz provided the answer to this in How do you version code in Android without compiler warnings?.
In addition to the @TargetApi(nn)
annotation in the code, you also need to import the definition of that annotation:
import android.annotation.TargetApi;
For some unknown reason, an import is not required to use the @Override
annotation. It would be helpful if the ADT documentation http://tools.android.com/recent/lintapicheck were fixed to eliminate the bogus code example and mention the required import.