效果图如下：
第一步：布局main.xml文件，这里使用了一个GridView和一个滚动文本控件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/backsmall"
android:orientation="vertical" >
<GridView
android:id="@+id/GridView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:columnWidth="90dip"
android:gravity="center"
android:horizontalSpacing="10dip"
android:numColumns="3"
android:verticalSpacing="10dip" >
</GridView>
<cn.superyouth.www.itools.MarqueeText
android:id="@+id/textMsg"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="115dp"
android:textColor="@android:color/black"
android:lines="1"
android:focusable="true"
android:focusableInTouchMode="true"
android:scrollHorizontally="true"
android:marqueeRepeatLimit="marquee_forever"
android:ellipsize="marquee"
/>
</LinearLayout>
第二步：编写SYIT_Index.java文件，继承自Activity类
package cn.superyouth.www;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import cn.superyouth.www.SYIT_SSJC.ReadHttpGet;
import cn.superyouth.www.itools.MarqueeText;
import cn.superyouth.www.itools.MenuItem;
import cn.superyouth.www.itools.Tools_AppAdapter;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ComponentName;
import android.content.Intent;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.method.ScrollingMovementMethod;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class SYIT_Index extends Activity {
MarqueeText autoScrollTextView;
StringBuilder builder = new StringBuilder();
public static String WARN_MSG = "";
private TextView text = null;
boolean isError = false;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gridview = (GridView) findViewById(R.id.GridView);
// 添加菜单
ArrayList<MenuItem> map = new ArrayList<MenuItem>();
for (int i = 1; i < 10; i++) {
if (i == 1) {
MenuItem item = new MenuItem();
item.title = "实时监测";
item.iconId = R.drawable.m1;
map.add(item);
}
if (i == 3) {
MenuItem item = new MenuItem();
item.title = "预警信息";
item.iconId = R.drawable.m2;
map.add(item);
}
if (i == 2) {
MenuItem item = new MenuItem();
item.title = "视频监控";
item.iconId = R.drawable.m3;
map.add(item);
}
if (i == 4) {
MenuItem item = new MenuItem();
item.title = "统计查询";
item.iconId = R.drawable.m4;
map.add(item);
}
if (i == 5) {
MenuItem item = new MenuItem();
item.title = "灾情上报";
item.iconId = R.drawable.m5;
map.add(item);
}
if (i == 6) {
MenuItem item = new MenuItem();
item.title = "卫星云图";
item.iconId = R.drawable.m6;
map.add(item);
}
if (i == 7) {
MenuItem item = new MenuItem();
item.title = "在线帮助";
item.iconId = R.drawable.m7;
map.add(item);
}
if (i == 8) {
MenuItem item = new MenuItem();
item.title = "气象雷达";
item.iconId = R.drawable.m8;
map.add(item);
}
if (i == 9) {
MenuItem item = new MenuItem();
item.title = "关于我们";
item.iconId = R.drawable.m9;
map.add(item);
}
}
Tools_AppAdapter adapter = new Tools_AppAdapter(this, map,
R.layout.item, new String[] { "ItemImage", "ItemText" },
new int[] { R.id.ItemImage, R.id.ItemText }); // 对应R的Id
gridview.setAdapter(adapter);
// 添加点击事件
gridview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
MenuItem item = (MenuItem) arg0.getItemAtPosition(arg2);
// Toast用于向用户显示一些帮助/提示
if (item.title.equals("实时监测")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_SSJC.class);
startActivity(intent);
}
if (item.title.equals("预警信息")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_Warning.class);
startActivity(intent);
}
if (item.title.equals("视频监控")) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
// 上面ComponentName有两个参数 第一个参数 ：包名 第二个参数：类的命名
ComponentName comp = new ComponentName(
"com.mm.android.direct.gdmssphoneLite",
"com.mm.android.direct.gdmssphoneLite.SplashActivity");
intent.setComponent(comp);
intent.setAction("android.intent.action.VIEW");
startActivity(intent);
}
if (item.title.equals("统计查询")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_TJCX.class);
startActivity(intent);
}
if (item.title.equals("灾情上报")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_PictureUpload.class);
startActivity(intent);
}
if (item.title.equals("卫星云图")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this,
SYIT_SatelliteCloudChart.class);
startActivity(intent);
}
if (item.title.equals("在线帮助")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_OnlineHelp.class);
startActivity(intent);
}
if (item.title.equals("气象雷达")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_WeatherRadar.class);
startActivity(intent);
}
if (item.title.equals("关于我们")) {
Intent intent = new Intent();
intent.setClass(SYIT_Index.this, SYIT_AboutUs.class);
startActivity(intent);
}
}
});
// 开启线程
new Thread() {
@Override
public void run() {
try {
} catch (Exception e) {
isError = true;
System.out.println(e.toString());
}
handler.sendEmptyMessage(0);
}
}.start();
autoScrollTextView = (MarqueeText) findViewById(R.id.textMsg);
autoScrollTextView.setTextSize(30);
// 点击预警提示信息，进入预警信息页面
autoScrollTextView.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// 进入预警信息页面
Intent intent = new Intent(SYIT_Index.this, SYIT_Warning.class);
startActivity(intent);
}
});
}
/**
* 用Handler来更新UI
*/
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (isError) {
// 创建提示
Dialog alertDialog = new AlertDialog.Builder(SYIT_Index.this)
.setTitle("提示").setMessage("服务器无响应,请稍候再试!")
.setIcon(R.drawable.ic_launcher).create();
alertDialog.show();
} else {
// 获取预警信息
new ReadHttpGet3()
.execute("http://61.190.32.10/CityLowerRoadSys/ashx/yjxx.ashx");
}
}
};
@SuppressLint("Override")
class ReadHttpGet3 extends AsyncTask<Object, Object, Object> {
@Override
protected Object doInBackground(Object... params) {
HttpGet httpRequest = new HttpGet(params[0].toString());
try {
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(httpRequest);
if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
String strResult = EntityUtils.toString(httpResponse
.getEntity());
return strResult;
} else {
return "请求出错";
}
} catch (ClientProtocolException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onCancelled(Object result) {
super.onCancelled();
}
@SuppressLint("Override")
@Override
protected void onPostExecute(Object result) {
super.onPostExecute(result);
try {
// 创建一个JSON对象
JSONObject jsonObject = new JSONObject(result.toString())
.getJSONObject("parent");
// 获取某个对象的JSON数组
JSONArray jsonArray = jsonObject.getJSONArray("children");
for (int i = 0; i < jsonArray.length(); i++) {
// 新建一个JSON对象，该对象是某个数组里的其中一个对象
JSONObject jsonObject2 = (JSONObject) jsonArray.opt(i);
builder.append(jsonObject2.getString("name") + " ");
WARN_MSG += jsonObject2.getString("name") + " ";
}
System.out.println(builder.toString());
if (builder.toString().length() == 0) {
autoScrollTextView.setTextColor(Color.BLUE);
autoScrollTextView.setText("暂无任何预警信息!");
} else {
autoScrollTextView.setTextColor(Color.RED);
autoScrollTextView.setText(builder.toString());
}
} catch (JSONException e) {
e.printStackTrace();
}
}
protected void onPreExecute() {
// Toast.makeText(getApplicationContext(),
// "开始HTTP GET请求",Toast.LENGTH_LONG).show();
}
protected void onProgressUpdate(Object... values) {
super.onProgressUpdate(values);
}
}
}
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