腊月的季节

Android开发总结(一)

发表于 | 分类于 | | 阅读次数

更新UI

开发遇到的问题:显示实时时间
解决方法:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
private Handler handleTime;
private TextView third_text;
third_text = (TextView)findViewById(R.id.third_text);
handleTime = new Handler(){
			public void handleMessage(android.os.Message msg) {
				third_text.setText((String)msg.obj);
			};
		};
Thread threadDate = new Thread(new Runnable() {
			GetDateTime getDateTime;
			@Override
			public void run() {
				// TODO Auto-generated method stub
				while(true){
					getDateTime = new GetDateTime();
					time = getDateTime.dealDate();
					handleTime.sendMessage(handleTime.obtainMessage(100,time));
					try {
						Thread.sleep(1000);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		});
		threadDate.start();

图表按钮之GridView

pictureModel.java类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
public class PictureModel {
	private String title;
	private int imageID;
	/**
	 * 默认构造函数
	 */
	public PictureModel(){}
	/**
	 * 
	 * @param 图像标注
	 * @param 图像ID
	 */
	public PictureModel(String title,int imageID){
		this.title = title;
		this.imageID = imageID;
	}
	/**
	 * 
	 * @return 返回图像标注
	 */
	public String getTitle() {
		return title;
	}
	/**
	 * 
	 * @param 设置图像标注
	 */
	public void setTitle(String title) {
		this.title = title;
	}
	/**
	 * 
	 * @return 返回图像ID
	 */
	public int getImageID() {
		return imageID;
	}
	/**
	 * 
	 * @param 设置图像ID
	 */
	public void setImageID(int imageID) {
		this.imageID = imageID;
	}
	
}

pictureAdapter.java类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
public class PictureAdapter extends BaseAdapter{
	private LayoutInflater inflater;
	private List<PictureModel> pictures;
	public PictureAdapter(String[] titles,int[] imageIDs,Context context){
		super();
		inflater = LayoutInflater.from(context);
		pictures = new ArrayList<PictureModel>();
		for(int i = 0;i<titles.length;i++){
			PictureModel picture = new PictureModel(titles[i],imageIDs[i]);
			pictures.add(picture);
		}
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		if(pictures!=null){
			return pictures.size();
		}else{
			return 0;
		}
	}
	@Override
	public Object getItem(int position) {
		// TODO Auto-generated method stub
		return pictures.get(position);
	}
	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		class ViewHolder{
			public TextView text;
			public ImageView image;
		}
		ViewHolder viewHolder = new ViewHolder();
		if(convertView == null){
			convertView = inflater.inflate(R.layout.picture_item, null);
			viewHolder.text = (TextView) convertView.findViewById(R.id.ItemTitle);
			viewHolder.image = (ImageView) convertView.findViewById(R.id.ItemImage);
			convertView.setTag(viewHolder);
		}else{
			viewHolder = (ViewHolder) convertView.getTag();
		}
		viewHolder.text.setText(pictures.get(position).getTitle());
		viewHolder.image.setImageResource(pictures.get(position).getImageID());
		return convertView;
	}
}

实现类，把view填充到GridView中

1
2
3
4
5
6
7
8
9
10
11
String[] titles = new String[6];
		int[] images = new int[6];
		images[0] = R.drawable.icon0;
		images[1] = R.drawable.icon1;
		images[2] = R.drawable.icon2;
		images[3] = R.drawable.icon3;
		images[4] = R.drawable.icon4;
		images[5] = R.drawable.icon5;
		gvInfo = (GridView) findViewById(R.id.gv_Info);
		PictureAdapter adapter = new PictureAdapter(titles, images, this);
		gvInfo.setAdapter(adapter);

构建Activity

1
2
3
super.onCreate(savedInstanceState);//开始窗体的生命周期
requestWindowFeature(Window.FEATURE_NO_TITLE);//设置参数
setContentView(R.layout.activity_main);//设置View

总结(1)

做了一天，进去看了很多源码，最终看到的是Context，View，Adapter。就这三个，说一下目前的了解，Context在我看来就是像浏览器引擎的上下文context，可以通过它做很多东西。而View大多是一个view组件，像xml文件里面的组成都是view。而adapter则可以做一个view然后填充到另一个view。或许三者合在一起就有了一个这么个窗体。

热评文章