ListView

package com.example.listviewcurd;

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

import com.example.entity.GeneralBean;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
	private static final int ACTION_DETAILS = 0;
	private static final int ACTION_ADD = 1;
	private static final int ACTION_DELETE = 2;
	private static final int ACTION_UPDATE = 3;
	

	
	ListView mlvGeneral;
	List<GeneralBean> mGenerals;
	GeneralAdapter mAdapter;
	int mPosition;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initData();
		initView();
		setListener();
	}

	private void setListener() {
		mlvGeneral.setOnItemLongClickListener(new OnItemLongClickListener() {

			@Override
			public boolean onItemLongClick(AdapterView<?> parent, View view,
					final int position, long id) {
				AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
				builder.setTitle("选择一下操作")
				.setItems(new String[]{"查看详情","添加数据","删除数据","修改数据"}, new OnClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which) {
						switch (which) {
						case ACTION_DETAILS:
							showDetails(position);
							break;
						case ACTION_ADD:
							
							break;
						case ACTION_DELETE:
							mAdapter.remove(position);
							break;
						case ACTION_UPDATE:
							//启动修改的activity，并把当前操作对象传递过去	
							Intent intent = new Intent(MainActivity.this,UpdateActivity.class);
							intent.putExtra("general", mGenerals.get(position));
							mPosition = position;
							startActivityForResult(intent, ACTION_UPDATE);//需要返回结果 在onActivityResult中接收返回的结果
							break;

						default:
							break;
						}
					}

					private void showDetails(int position) {
						GeneralBean general = mGenerals.get(position);
						AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
						builder.setTitle(general.getName())
						.setMessage(general.getDetails())
						.setPositiveButton("返回", null);
						AlertDialog dialog = builder.create();
						dialog.show();
					}
				});
				AlertDialog dialog = builder.create();
				dialog.show();
				return true;
			}
		});
	}

	private void initView() {
		mlvGeneral = (ListView) this.findViewById(R.id.lvGeneral);
		mAdapter = new GeneralAdapter(mGenerals, this); 	
		mlvGeneral.setAdapter(mAdapter);
	}

	private void initData() {
		String[] names = getResources().getStringArray(R.array.general);
		String[] details = getResources().getStringArray(R.array.details);
		mGenerals = new ArrayList<GeneralBean>();
		for(int i=0;i<names.length;i++){
			GeneralBean general = new GeneralBean(names[i], details[i]);
			mGenerals.add(general);
		}
	}

	class GeneralAdapter extends BaseAdapter {
		List<GeneralBean> generals;
		MainActivity context;
		
		public void remove(int position){
			generals.remove(position);
			notifyDataSetChanged();//通知数据集改变，会重新调用getView	
		}
		
		public void add(GeneralBean general){
			mGenerals.add(general);
			notifyDataSetChanged();
		}
		
		public void update(int position,GeneralBean general){
			mGenerals.set(position, general);
			notifyDataSetChanged();
		}
		
		public GeneralAdapter(List<GeneralBean> generals, MainActivity context) {
			super();
			this.generals = generals;
			this.context = context;
		}

		@Override
		public int getCount() {
			return generals.size();
		}

		@Override
		public Object getItem(int arg0) {
			return null;
		}

		@Override
		public long getItemId(int arg0) {
			return 0;
		}

		@Override
		public View getView(int position, View contentView, ViewGroup parent) {
			ViewHolder holder = null;
			if (contentView == null) {
				contentView = View
						.inflate(context, R.layout.item_general, null);
				holder = new ViewHolder();
				holder.tvName = (TextView) contentView.findViewById(R.id.tvName);
				contentView.setTag(holder);
			}else{
				holder = (ViewHolder) contentView.getTag();
			}
			GeneralBean general = generals.get(position);
			holder.tvName.setText(general.getName());
//			Log.i("main","postion="+position);
			return contentView;
		}

		class ViewHolder {
			TextView tvName;
		}

	}
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if(resultCode!=RESULT_OK){
			return;
		}
		switch (requestCode) {
		case ACTION_UPDATE:
			GeneralBean general = (GeneralBean) data.getSerializableExtra("general"); 
			mAdapter.update(mPosition, general);
			break;

		case ACTION_ADD:
			
			break;
		}
	}
}

package com.example.listviewcurd;

import com.example.entity.GeneralBean;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;

public class UpdateActivity extends Activity {
	EditText metName,metDetails;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_update);
		initView();
		initData();
		setListener();
	}
	private void setListener() {
		setOKClickListener();
		setCancelClickListener();
	}
	private void setCancelClickListener() {
		findViewById(R.id.btnCancel).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				finish();//把窗口关闭
			}
		});
	}
	private void setOKClickListener() {
		findViewById(R.id.btnOK).setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String details = metDetails.getText().toString();
				String name = metName.getText().toString();
				GeneralBean general = new GeneralBean(name, details);
				Intent intent = new Intent(UpdateActivity.this, MainActivity.class);
				intent.putExtra("general", general);
				setResult(RESULT_OK, intent);
				finish();
			}
		});
	}
	private void initData() {
		Intent intent = getIntent();
		GeneralBean general = (GeneralBean) intent.getSerializableExtra("general");
		metName.setText(general.getName());
		metDetails.setText(general.getDetails());
	}
	private void initView() {
		metName = (EditText) this.findViewById(R.id.etName);
		metDetails = (EditText) this.findViewById(R.id.etDetails);
	}



}