android 文件的读取 附源码

与前面的文章http://leequer.iteye.com/blog/607079android的数据存储和访问 附源码这篇文章相比，添加了文件的读取功能和代码的优化

package cn.lee.data;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import cn.lee.Manager.DataManager;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AboutDateActivity extends Activity {
	private EditText fileNameEditText;
	private EditText fileContentEditText;
	private EditText readfileContentEditText;
	private Button button;
	private Button readButton;
	private static final String TAGSTRING = "AboutDateActivity";

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		button                  = (Button) this.findViewById(R.id.button);
		readButton              = (Button) this.findViewById(R.id.readButton);
		fileNameEditText        = (EditText) this.findViewById(R.id.fileName);
		fileContentEditText     = (EditText) this.findViewById(R.id.fileContent);
		readfileContentEditText = (EditText) this.findViewById(R.id.readfileContent);
		
		
		// 读取
		readButton.setOnClickListener(onClickListener);
		// 保存
		button.setOnClickListener(onClickListener);
	}

	/**
	 * 由于这个内部实现类是一个接口的实例 所以这里把他提取出来 作为一个成员变量 2010-04-18
	 */
	private View.OnClickListener onClickListener = new View.OnClickListener() {
		/**
		 * 由于button的父类是view 所以这里的onclick的参数传来的view v就可以找到这个button
		 */
		public void onClick(View v) {
			Button button = (Button) v;// 将父类view强转成子类button
			int info = R.string.sus;
			String fileNameString = fileNameEditText.getText().toString();
			
			if ("".equals(fileNameString)) {
				info = R.string.filenamenotnull;
			} else {
				FileOutputStream fileOutputStream = null;
				FileInputStream  fileInputStream  = null;
				try {
					switch (button.getId()) {
					case R.id.button: {// 保存
						String fileContentString = fileContentEditText.getText().toString();
						fileOutputStream = AboutDateActivity.this
								.openFileOutput(fileNameString,
										Context.MODE_PRIVATE);
						DataManager.saveDate(fileOutputStream,
								fileContentString);

						break;
					}

					case R.id.readButton: {
						fileInputStream = null;
						fileInputStream = AboutDateActivity.this
								.openFileInput(fileNameString);
						String contentString = DataManager
								.readDate(fileInputStream);
						readfileContentEditText.setText(contentString);
						break;
					}
					default:
						break;
					}
				
				
				} catch (Exception e) {
					// TODO Auto-generated catch block
					Log.i(TAGSTRING, e.toString());
					info = R.string.infor;
				} finally {
					try {
						if(fileOutputStream!=null)
						{
							fileOutputStream.close();
						}
						if(fileInputStream !=null)
						{
							fileInputStream.close();
						}
						
					} catch (IOException e) {
						
						Log.i(TAGSTRING, e.toString());
						info = R.string.infor;
					}
				}
			}
			Toast.makeText(AboutDateActivity.this, info, 1).show();
		}

	};
}

评论

3 楼 xiaojian623 2011-09-14  

二楼连源码都懒得下下来看看啊！

2 楼 struts_2010 2011-07-01  

楼主这次的更新，好像没有顺带把xml界面配置文件拷贝出来啊

1 楼 blocker2005 2011-03-23  

很好啊，楼主给力啊