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1.安装JDK

从官网下载JDK安装，

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

我选择的如上图红色，为jdk1.8.0_45。

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安装好JDK之后，会提示安装JRE，请保持安装在同一目录：如均在"Java"目录下

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2.配置环境变量

1. 新建JAVA_HOME：选择jdk的安装路径，如K:\Java\jdk1.8.0_45

   

2. Path中增加：%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

   

3. 新建CLASSPATH：.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

   

4. 验证

   

   

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   java和javac命令都通过，则说明配置好了！

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3.下载ADT

由于不知怎么找到，从百度云盘搜索了一个。

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4.实用工具

Ctr +shift+O 自动添加包

Ctr+/????????注释代码

Ctr+Shit+F????自动格式化代码

注：如果快捷键失效，请关闭搜狗输入法的全局热键。

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由于很久没有打开过开发环境了：

居然不知多了一个fragment.xml的配置，调试的时候总是提示有问题：

在网上找到一个经验：

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1. 将带有fragment_***.xml的文件删除；
2. 打开对应的Activity，将ActionBarActivity替换为Activity；
3. 去除PlaceholderFragment整个类

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修改之前：

1. public class TestActivity extends ActionBarActivity {
2. ?
3. ???@Override
4. ???protected void onCreate(Bundle savedInstanceState) {
5. ??????super.onCreate(savedInstanceState);
6. ??????setContentView(R.layout.activity_test);
7. ?
8. ??????if (savedInstanceState == null) {
9. ?????????getSupportFragmentManager().beginTransaction()
10. ???????????????.add(R.id.container, new PlaceholderFragment()).commit();
11. ??????}
12. ???}
13. ?
14. ???@Override
15. ???public boolean onCreateOptionsMenu(Menu menu) {
16. ?
17. ??????// Inflate the menu; this adds items to the action bar if it is present.
18. ??????getMenuInflater().inflate(R.menu.test, menu);
19. ??????return true;
20. ???}
21. ?
22. ???@Override
23. ???public boolean onOptionsItemSelected(MenuItem item) {
24. ??????// Handle action bar item clicks here. The action bar will
25. ??????// automatically handle clicks on the Home/Up button, so long
26. ??????// as you specify a parent activity in AndroidManifest.xml.
27. ??????int id = item.getItemId();
28. ??????if (id == R.id.action_settings) {
29. ?????????return true;
30. ??????}
31. ??????return super.onOptionsItemSelected(item);
32. ???}
33. ?
34. ???/**
35. ????* A placeholder fragment containing a simple view.
36. ????*/
37. ???public static class PlaceholderFragment extends Fragment {
38. ?
39. ??????public PlaceholderFragment() {
40. ??????}
41. ?
42. ??????@Override
43. ??????public View onCreateView(LayoutInflater inflater, ViewGroup container,
44. ????????????Bundle savedInstanceState) {
45. ?????????View rootView = inflater.inflate(R.layout.fragment_test, container,
46. ???????????????false);
47. ?????????return rootView;
48. ??????}
49. ???}
50. }

修改之后：

1. public class TestActivity extends Activity {
2. ?
3. ???@Override
4. ???protected void onCreate(Bundle savedInstanceState) {
5. ??????super.onCreate(savedInstanceState);
6. ??????setContentView(R.layout.activity_test);
7. ???}
8. ?
9. ???@Override
10. ???public boolean onCreateOptionsMenu(Menu menu) {
11. ?
12. ??????// Inflate the menu; this adds items to the action bar if it is present.
13. ??????getMenuInflater().inflate(R.menu.test, menu);
14. ??????return true;
15. ???}
16. ?
17. ???@Override
18. ???public boolean onOptionsItemSelected(MenuItem item) {
19. ??????// Handle action bar item clicks here. The action bar will
20. ??????// automatically handle clicks on the Home/Up button, so long
21. ??????// as you specify a parent activity in AndroidManifest.xml.
22. ??????int id = item.getItemId();
23. ??????if (id == R.id.action_settings) {
24. ?????????return true;
25. ??????}
26. ??????return super.onOptionsItemSelected(item);
27. ???}
28. }

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