Android Eclipse Lint API检查

问题描述

感谢P.T.对于。但是，当我按照推荐使用@TargetApi（）注释时，会产生语法错误。

  @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）; } 
  

在@TargetApi行中生成两个语法错误，当它在代码中间时，如图所示在位置3：

  x语法错误，插入枚举标识符完成EnumHeaderName 
x语法错误，插入enumBody 完成BlockStatements 
  

无论我是否有 @TargetApi 在之前，如果语句或之后显示。是否有任何先决条件（导入）或其他未在 Lint API检查中提及的注意事项文章获取@TargetApi（）是否正常工作？

- - 编辑9/3/2012 ---

如果我将@TargetApi注释移动到类定义之前（如位置1所示）或方法定义之前（显示）作为位置2，在@Override注释之前或之后），我收到不同的错误：

  x TargetApi无法解析为键入
x注释类型的属性值未定义TargetApi 
  

---编辑9 / 4/2012 ---

以下是完整的源代码：

  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）; 
 //在Android 3.0中引入的ActionBar Honeycomb API 11 
 if（Build.VERSION.SDK_INT> = Build.VERSION_CODES.HONEYCOMB）{
 getActionBar（）。setDisplayHomeAsUpEnabled（true）; } //向上导航
 
 //从意图获取消息
 Intent intent = getIntent（）; 
 String message = intent.getStringExtra（MainActivity.EXTRA_MESSAGE）; 
 
 //创建文本视图
 TextView textView = new TextView（this）; 
 textView.setTextSize（40）; 
 textView.setText（message）; 
 
 //将文本视图设置为活动布局
 setContentView（textView）; 
} 
 
 @Override 
 public boolean onCreateOptionsMenu（菜单菜单）{
 getMenuInflater（）。inflate（R.menu.activity_display_message，menu）; 
返回true; 
} 
 
 
 @Override 
 public boolean onOptionsItemSelected（MenuItem item）{
 switch（item.getItemId（））{
 case android .R.id.home：
 NavUtils.navigateUpFromSameTask（this）; 
返回true; 
} 
返回super.onOptionsItemSelected（item）; 
} 
 
} 
  

解决方案

FizzBu​​zz在。

除了 @TargetApi（nn）

  import android.annotation.TargetApi; 
  

由于某些未知的原因，导入不需要使用 @Override 注释。如果ADT文档 http://tools.android.com/recent/lintapicheck被修复以消除虚假代码示例并提及所需的导入。

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);
    }

}

解决方案

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.

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