Android--对话框

版权声明：孜孜不辍 https://blog.csdn.net/calculate23/article/details/85063708

前言

使用Android应用时，系统通过弹出一些询问或者选择的对话框和用户进行交互，进而完成操作。这里，使用AlterDialog进行对话框设置。一般我们实例化AlterDialog中Builder类，然后使用以下方法进行设置界面：

setTitle() : 为对话框设置标题
setIcon() : 为对话框设置图标
setMessgae() : 为对话框设置内容
setView() : 为对话框设置自定义样式
setItems() : 设置对话框要显示的一个list，一般用于在显示几个命令时
setMultiChoiceItems() : 用来设置对话框显示的一系列复选框
setNeutraButton() : 普通按钮
setPositiveButton() : 给对话框添加“YES”按钮
setNegativeButton() : 给对话框添加“NO”按钮
create() : 创建对话框
show() : 显示对话框

---

Android代码：

package cn.zhuangzhihuang.mydialog;

import java.util.ArrayList;
import java.util.List;

import cn.zhuangzhihuang.mydialog.R;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	List<Person> friend_List;
	private MyAdapter myAdapter;
	private int this_ID;
	
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        ListView data_view = (ListView) findViewById(R.id.data_view);
        
        Person[] DB = {
        		new Person("张三","18555555555"),
        		new Person("李四","18555555556"),
        		new Person("王五","18555555557"),
        		new Person("赵六","18555555558"),
        		new Person("邓七","18555555559")    		
        		
        };
        
        friend_List = new ArrayList<Person>();
        for(int i=0;i<DB.length;i++) {
        	friend_List.add(DB[i]);
        }
        
        //自定义适配器
        myAdapter = new MyAdapter();
        data_view.setAdapter(myAdapter);
        
        registerForContextMenu(data_view);
//        data_view.setOnItemClickListener(new OnItemClickListener() {
//
//			@Override
//			public void onItemClick(AdapterView<?> parent, View view,
//					int position, long id) {
//				// TODO Auto-generated method stub
//				String temp = friend_List.get((int)id).toString();
//				Toast.makeText(MainActivity.this, temp, 0).show();
//				
//			}
//		});  //显示事件监听
    }
    
    class MyAdapter extends BaseAdapter {

		@Override
		public int getCount() {  //返回表的长度
			// TODO Auto-generated method stub
			return friend_List.size();
		}

		@Override
		public Object getItem(int position) {  //返回表的index位置的元组
			// TODO Auto-generated method stub
			return friend_List.get(position); 
		}

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			View view = View.inflate(MainActivity.this, R.layout.item, null);
			TextView tv_item_name = (TextView) view.findViewById(R.id.tv_item_name);
			TextView tv_item_tel = (TextView) view.findViewById(R.id.tv_item_tel);
			tv_item_name.setText(friend_List.get(position).getName());
			tv_item_tel.setText(friend_List.get(position).getTel());
			return view;
		}
    	
    }
    
    //------------------
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {  //添加菜单的事件
    	// TODO Auto-generated method stub
    	int itemId = item.getItemId();
    	switch (itemId) {
		case R.id.menu_add:
			addItem();
			break;

		default:
			break;
		}
    	return super.onOptionsItemSelected(item);
    }

	private void addItem() {    //获得添加事件的方法
		// TODO Auto-generated method stub
		final View view = View.inflate(MainActivity.this, R.layout.add, null);
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		builder.setTitle("添加新记录");
		builder.setView(view);
		builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				EditText et_add_name = (EditText)view.findViewById(R.id.et_add_name);
				EditText et_add_tel = (EditText)view.findViewById(R.id.et_add_tel);
				String name = et_add_name.getText().toString().trim();
				String tel = et_add_tel.getText().toString().trim();
				friend_List.add(new Person(name,tel));
				myAdapter.notifyDataSetChanged();
			}
		});
		builder.setNegativeButton("取消", null);
		builder.create().show();
	}
	
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,  //设置上下文菜单的监听
			ContextMenuInfo menuInfo) { 
		// TODO Auto-generated method stub
		getMenuInflater().inflate(R.menu.context, menu);
	}
	
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		int itemId = item.getItemId();
    	switch (itemId) {
		case R.id.menu_delete:
			deleteItem();
			break;

		default:
			break;
		}
		return super.onContextItemSelected(item);
	}

	private void deleteItem() {
		// TODO Auto-generated method stub
		Builder builder = new AlertDialog.Builder(MainActivity.this);
		builder.setTitle("删除记录");
		builder.setMessage("确定要删除该记录吗?");
		builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				// TODO Auto-generated method stub
				friend_List.remove(this_ID);
				myAdapter.notifyDataSetChanged();
			}
		});
		builder.setNegativeButton("取消", null);
		builder.create().show();
	}
	
}

<?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" >
	
    <EditText
        android:id="@+id/et_add_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" >
        
        <requestFocus />
    </EditText>
	
    <EditText
        android:id="@+id/et_add_tel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" />

</LinearLayout>

代码时在之前listview那个代码基础上添加的，部分重复代码省略
效果：