從零開始學android(數據存儲（2）Internal Storage內部存儲.三十六.)

以上就是講數據文件保存到內部儲存的基本步驟

下面用代碼進行一下講解

package com.example.internalstorage;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
	private Button saveData, getData;
	private static final String FILENAME = "flyou.txt";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		saveData=(Button)this.findViewById(R.id.button1);
		getData=(Button)this.findViewById(R.id.button2);
		saveData.setOnClickListener(new View.OnClickListener() {／／保存信息
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				FileOutputStream out = null;
				try {
					String infoString = "風飛雪未揚";
					out = openFileOutput(FILENAME, Context.MODE_PRIVATE);
					out.write(infoString.getBytes());
					Toast.makeText(MainActivity.this, "數據保存成功", 2).show();
				} catch (FileNotFoundException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}

				finally {
					try {
						if (out!=null) {
						
							out.close();	
						}
						
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}	
			}
		});
		
//		讀取信息
		
		getData.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
			FileInputStream input=null;
			try {
				input=openFileInput(FILENAME);
				byte[] data=new byte[1024];
				int len=input.read(data);
				input.close();
//				System.out.println(new String(data,0,len));
				Toast.makeText(MainActivity.this, new String(data,0,len), 2).show();
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
				
			}
		});
	}

}

打開信息

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使用文件浏覽器查看信息

將文件導出

用記事本打開

以上操作可以很容易的實現文件的內部存儲過程

官方ａｐｉ當中還有關於如何存儲緩存文件的說明，大家可以自行實驗一下

下節預報：

External Storage外部存儲