android_我的第一个Android程序

今天开始学Android开发，搞了一下午就完成了两个小功能，大部分时间都在调试、熟悉环境，

Android开发环境对比VS无论是安装、使用、更新都不够方便，不过慢慢适应就好

完成功能如下：
功能一：显示当前系统时间
功能二：根据编号获取城市天气

View层：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:id="@+id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/show"
android:onClick="getCurrentDate"
android:text="获取当前时间：" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="33dp"
android:onClick="getWuHanWeather"
android:text="获取城市天气：" />

<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button1"
android:text="1"
android:ems="10" >

<requestFocus />
</EditText>

</RelativeLayout>

功能一：显示当前系统时间

public void getCurrentDate(View source) {
TextView tv = (TextView) findViewById(R.id.show);
tv.setText("当前时间:" + new java.util.Date());

}

功能二：根据编号获取城市天气

TextView response;
HttpClient httClient;

public void getWuHanWeather(View source) {
this.httClient = new DefaultHttpClient();
this.response = (TextView) findViewById(R.id.show);

accessSecret(source);
}

Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == 0x123) {
response.setText("");
response.setText(msg.obj.toString() + "\n");
}
}
};

public void accessSecret(View v) {
String type = "";
int inputValue=Integer.parseInt(((EditText) findViewById(R.id.editText1)).getText().toString());
if (inputValue== 1) {
type = "101200101";
} else {
type = "101200401";
}

final String cityId = type;
new Thread() {
@Override
public void run() {
// 创建一个HttpGet对象
String url = "http://www.weather.com.cn/adat/sk/" + cityId
+ ".html";
HttpGet get = new HttpGet(url);

// HttpGet get = new HttpGet(
// "http://www.weather.com.cn/adat/sk/101200101.html");
try {
// 发送GET请求
HttpResponse httpResponse = httClient.execute(get);
String json = EntityUtils.toString(
httpResponse.getEntity(), "UTF-8");

Message msg = new Message();
msg.what = 0x123;
msg.obj = json;
handler.sendMessage(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();

}

来自为知笔记(Wiz)