Android利用GridView載入九宮格選單
阿新 • • 發佈：2018-12-24
效果圖如下：
第一步：佈局main.xml檔案，這裡使用了一個GridView和一個滾動文字控制元件
<?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：編寫SYIT_Index.java檔案，繼承自Activity類
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); // 新增選單 ArrayList<MenuItem> map = new ArrayList<MenuItem>(); for (int i = 1; i < 10; i++) { if (i == 1) { MenuItem item = new MenuItem(); item.title = "實時監測"; item.iconId = R.drawable.m1; map.add(item); } if (i == 3) { MenuItem item = new MenuItem(); item.title = "預警資訊"; item.iconId = R.drawable.m2; map.add(item); } if (i == 2) { MenuItem item = new MenuItem(); item.title = "視訊監控"; item.iconId = R.drawable.m3; map.add(item); } if (i == 4) { MenuItem item = new MenuItem(); item.title = "統計查詢"; item.iconId = R.drawable.m4; map.add(item); } if (i == 5) { MenuItem item = new MenuItem(); item.title = "災情上報"; item.iconId = R.drawable.m5; map.add(item); } if (i == 6) { MenuItem item = new MenuItem(); item.title = "衛星雲圖"; item.iconId = R.drawable.m6; map.add(item); } if (i == 7) { MenuItem item = new MenuItem(); item.title = "線上幫助"; item.iconId = R.drawable.m7; map.add(item); } if (i == 8) { MenuItem item = new MenuItem(); item.title = "氣象雷達"; item.iconId = R.drawable.m8; map.add(item); } if (i == 9) { MenuItem item = new MenuItem(); item.title = "關於我們"; 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 }); // 對應R的Id gridview.setAdapter(adapter); // 新增點選事件 gridview.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { MenuItem item = (MenuItem) arg0.getItemAtPosition(arg2); // Toast用於向用戶顯示一些幫助/提示 if (item.title.equals("實時監測")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_SSJC.class); startActivity(intent); } if (item.title.equals("預警資訊")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_Warning.class); startActivity(intent); } if (item.title.equals("視訊監控")) { Intent intent = new Intent(Intent.ACTION_MAIN); intent.addCategory(Intent.CATEGORY_LAUNCHER); // 上面ComponentName有兩個引數 第一個引數 ：包名 第二個引數：類的命名 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("統計查詢")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_TJCX.class); startActivity(intent); } if (item.title.equals("災情上報")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_PictureUpload.class); startActivity(intent); } if (item.title.equals("衛星雲圖")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_SatelliteCloudChart.class); startActivity(intent); } if (item.title.equals("線上幫助")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_OnlineHelp.class); startActivity(intent); } if (item.title.equals("氣象雷達")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_WeatherRadar.class); startActivity(intent); } if (item.title.equals("關於我們")) { Intent intent = new Intent(); intent.setClass(SYIT_Index.this, SYIT_AboutUs.class); startActivity(intent); } } }); // 開啟執行緒 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); // 點選預警提示資訊，進入預警資訊頁面 autoScrollTextView.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { // 進入預警資訊頁面 Intent intent = new Intent(SYIT_Index.this, SYIT_Warning.class); startActivity(intent); } }); } /** * 用Handler來更新UI */ private Handler handler = new Handler() { public void handleMessage(Message msg) { if (isError) { // 建立提示 Dialog alertDialog = new AlertDialog.Builder(SYIT_Index.this) .setTitle("提示").setMessage("伺服器無響應,請稍候再試!") .setIcon(R.drawable.ic_launcher).create(); alertDialog.show(); } else { // 獲取預警資訊 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 "請求出錯"; } } 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 { // 建立一個JSON物件 JSONObject jsonObject = new JSONObject(result.toString()) .getJSONObject("parent"); // 獲取某個物件的JSON陣列 JSONArray jsonArray = jsonObject.getJSONArray("children"); for (int i = 0; i < jsonArray.length(); i++) { // 新建一個JSON物件，該物件是某個數組裡的其中一個物件 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("暫無任何預警資訊!"); } else { autoScrollTextView.setTextColor(Color.RED); autoScrollTextView.setText(builder.toString()); } } catch (JSONException e) { e.printStackTrace(); } } protected void onPreExecute() { // Toast.makeText(getApplicationContext(), // "開始HTTP GET請求",Toast.LENGTH_LONG).show(); } protected void onProgressUpdate(Object... values) { super.onProgressUpdate(values); } } }
===========================================================================
如果覺得對您有幫助，微信掃一掃支援一下：
