71.s1-創建GradView并對GradView進行監聽-有解無憂

gridview主要用于對某些安卓界面的簡單布局使用，通過添加監聽事件來對gridview的每一個模塊的點擊進行處理，

GrideView和ListView類似，都需要setAdapter同時創建HomeAdapter來繼承BaseAdapter來進行逐一填充

布局檔案，創建一個3列的布局

    <GridView 
        android:id="@+id/gv_home"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:verticalSpacing="10dp"
        android:numColumns="3"
        ></GridView>

對GradView添加監聽事件

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        gv_home = (GridView) findViewById(R.id.gv_home);
        gv_home.setAdapter(new HomeAdapter());
        //監聽gridview點擊事件
        gv_home.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				switch(position){
				case 8:
					//設定中心
					startActivity(new Intent(HomeActivity.this, SettingActivity.class));
					break;
				default:
					break;
				}
			}
        	
        });
        
	}

GrideView的使用

首先創建布局檔案

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    

    <TextView 
		style="@style/TitleStyle"
    	android:text="手機管家"
        />
    <com.ldw.safe.view.FocusedTextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="@color/black"
        android:text="簡書是一個優質的創作社區,在這里,你可以任性地創作,一篇短文、一張照片、一首詩、一幅畫……我們相信,每個人都是生活中的藝術家,有著無窮的創造力"
        android:singleLine="true"
        android:ellipsize="marquee"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:textSize="18sp"
        />
    <GridView 
        android:id="@+id/gv_home"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:verticalSpacing="10dp"
        android:numColumns="3"
        ></GridView>
</LinearLayout>

GrideView的單個條目

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical" >
    
    <ImageView 
        android:id="@+id/iv_item"
        android:layout_width="wrap_content"
    	android:layout_height="wrap_content"
    	android:src="@drawable/app"
        />
    
    <TextView
        android:id="@+id/tv_item"
        android:layout_width="wrap_content"
    	android:layout_height="wrap_content"
    	android:text="手機衛士"
    	android:textColor="@color/black"
    	android:layout_marginTop="5dp"
    	android:textSize="18sp"
        />

</LinearLayout>

邏輯代碼，將單個條目逐一填充在GrideView中

package com.ldw.safe.Activity;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.ldw.safe.R;
import com.ldw.safe.utils.MD5Utils;

public class HomeActivity extends Activity{
	
	private GridView gv_home;
	
	private String[] mItems = new String[] {"手機防盜", "通訊衛士", "軟體管理", "行程管理", "流量統計", "手機殺毒", "快取清理", "高級工具", "設定中心"};
	private int[] mPics = new int[] {R.drawable.safe, R.drawable.callmsgsafe, R.drawable.app, 
			R.drawable.taskmanager, R.drawable.netmanager, R.drawable.sysoptimize, 
			R.drawable.trojan, R.drawable.atools, R.drawable.settings};

	private SharedPreferences mPref;
	
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        
        mPref = getSharedPreferences("config", MODE_PRIVATE);
        
        gv_home = (GridView) findViewById(R.id.gv_home);
        gv_home.setAdapter(new HomeAdapter());
        //監聽gridview點擊事件
        gv_home.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				switch(position){
				case 0:
					//手機防盜
					showPasswordDialog();
					break;
				case 1:
					//通訊衛士
					startActivity(new Intent(HomeActivity.this, CallSafeActivity.class));
					break;
				case 2:
					//軟體管理
					startActivity(new Intent(HomeActivity.this, AppManagerActivity.class));
					break;
				case 3:
					//行程管理
					startActivity(new Intent(HomeActivity.this, TaskManagerActivity.class));
					break;
				case 5:
					//手機殺毒
					startActivity(new Intent(HomeActivity.this, AntivirusActivity.class));
					break;
				case 7:
					//高級工具
					startActivity(new Intent(HomeActivity.this, AdvancedToolsActivity.class));
					break;			
				case 8:
					//設定中心
					startActivity(new Intent(HomeActivity.this, SettingActivity.class));
					break;
				default:
					break;
				}
			}
        	
        });
        
	}
	
	/*
	 * 顯示密碼的彈窗
	 */
	protected void showPasswordDialog(){
		//判斷是否設定密碼
		String savePassword = mPref.getString("password", null);
		if(!TextUtils.isEmpty(savePassword)){
			//輸入密碼的彈窗
			showPasswordInputDialog();
		}else{
			//如果沒有設定過，彈出密碼設定的彈窗
			showPasswordSetDialog();
		}

	}
	
	/*
	 * 輸入密碼框，設定過密碼只需要登陸
	 */
	protected void showPasswordInputDialog(){
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		final AlertDialog dialog = builder.create();
		
		View view = View.inflate(this, R.layout.dialog_input_password, null);
		//dialog.setView(view);//自定義的view設定到dialog
		dialog.setView(view, 0, 0, 0, 0);//設定邊距為0，兼容android2.3
		
		final EditText etPassword = (EditText) view.findViewById(R.id.et_password);
		
		//獲取2個按鍵
		Button btnOk = (Button)view.findViewById(R.id.btn_ok);
		Button btnCancle = (Button)view.findViewById(R.id.btn_cancle);
		//監聽ok按鍵
		btnOk.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				String password = etPassword.getText().toString();
				
				if(!TextUtils.isEmpty(password)){
					String savePassword = mPref.getString("password", null);
					if(MD5Utils.encode(password).equals(savePassword)){
						Toast.makeText(HomeActivity.this, "登陸成功", Toast.LENGTH_SHORT).show();
						//對話框消失
						dialog.dismiss();
						
						//跳轉到手機防盜界面
						startActivity(new Intent(HomeActivity.this, LostAndFind.class));
					}else{
						Toast.makeText(HomeActivity.this, "登陸失敗", Toast.LENGTH_SHORT).show();
					}
				}else{
					Toast.makeText(HomeActivity.this, "輸入框不能是空的", Toast.LENGTH_SHORT).show();
				}
				
			}
			
		});
		//監聽取消按鍵
		btnCancle.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				dialog.dismiss();
				
			}
			
		});
		
		dialog.show();
	}
	
	/*
	 * 設定密碼的彈窗,以前沒有設定密碼
	 */
	protected void showPasswordSetDialog(){
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		final AlertDialog dialog = builder.create();
		
		View view = View.inflate(this, R.layout.dialog_set_password, null);
		//dialog.setView(view);//自定義的view設定到dialog
		dialog.setView(view, 0, 0, 0, 0);//設定邊距為0，兼容android2.3
		
		final EditText etPassword = (EditText) view.findViewById(R.id.et_password);
		final EditText etPasswordConfirm = (EditText) view.findViewById(R.id.et_password_confirm);
		
		//獲取2個按鍵
		Button btnOk = (Button)view.findViewById(R.id.btn_ok);
		Button btnCancle = (Button)view.findViewById(R.id.btn_cancle);
		//監聽ok按鍵
		btnOk.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				String password = etPassword.getText().toString();
				String passwordConfirm = etPasswordConfirm.getText().toString();
				//TextUtils.isEmpty(password)判斷password是不是空，可以避免都是空格
				if(!TextUtils.isEmpty(password) && !passwordConfirm.isEmpty()){
					if(password.equals(passwordConfirm)){
						Toast.makeText(HomeActivity.this, "登陸成功", Toast.LENGTH_SHORT).show();
						//保存密碼到mPref
						mPref.edit().putString("password", MD5Utils.encode(password)).commit();
						//對話框消失
						dialog.dismiss();
						
						//跳轉到手機防盜界面
						startActivity(new Intent(HomeActivity.this, LostAndFind.class));
					}else{
						Toast.makeText(HomeActivity.this, "兩次密碼不一致", Toast.LENGTH_SHORT).show();
					}
				}else{
					Toast.makeText(HomeActivity.this, "輸入框不能是空的", Toast.LENGTH_SHORT).show();
				}
				
			}
			
		});
		//監聽取消按鍵
		btnCancle.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				dialog.dismiss();
				
			}
			
		});
		
		dialog.show();
	}
	
	class HomeAdapter extends BaseAdapter{

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return mItems.length;
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return mItems[position];
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			
			View view = View.inflate(HomeActivity.this, R.layout.home_list_item, null);
			ImageView iv_item = (ImageView) view.findViewById(R.id.iv_item);
			TextView tv_item = (TextView) view.findViewById(R.id.tv_item);
			
			iv_item.setImageResource(mPics[position]);
			tv_item.setText(mItems[position]);
			
			return view;
		}
		
	}

}

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