Android第三个功能：将文件保存到程序内部-CFANZ编程社区

核心代码四部分：

1、Layout

2、String值

3、MainActivity

4、FileService.java 文件处理业务类

5、截图看效果

6、看程序中的文件是否有

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

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/filename" 
        />
    
    <EditText 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/filename"
        />
    
        <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/filecontent" 
        />
    
    <EditText 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:minLines="3"
        android:id="@+id/filecontent"
        />
    
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button"
        android:id="@+id/button"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">存储到程序内部</string>
    <string name="filename">文件名称</string>
    <string name="filecontent">文件内容</string>
    <string name="button">保存</string>
    <string name="success">保存完成</string>
    <string name="fail">保存失败</string>
    
</resources>

package com.dcj;

import com.dcj.service.FileService;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.widget.SimpleAdapter.ViewBinder;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button button = (Button)this.findViewById(R.id.button);
        button.setOnClickListener(new ButtonClickListener());
    }
    
    private final class ButtonClickListener implements View.OnClickListener {
        
        public void onClick(View v) {
            EditText filenameText = (EditText) findViewById(R.id.filename);
            EditText contentText = (EditText) findViewById(R.id.filecontent);
            String filename = filenameText.getText().toString();
            String content = contentText.getText().toString();
            
            FileService service = new FileService(getApplicationContext());
            try {
                service.save(filename, content);
                Toast.makeText(getApplicationContext(), R.string.success, 1).show();
            } catch (Exception e) {
                Toast.makeText(getApplicationContext(), R.string.fail, 1).show();
                e.printStackTrace();
            }
        }
    }
}

package com.dcj.service;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import android.content.Context;

public class FileService {
  private Context context;
  public FileService(Context applicationContext) {
    context = applicationContext;
  }
  
  /**
   * 保存文件
   * @param filename 文件名称
   * @param content 文件内容
   * @throws Exception 
   */
  public void save(String filename, String content) throws Exception {
    // IO j2se
    //私有操作模式：创建出来的文件只能被本应用访问，其它应用无法访问该文件，另外采用私有操作创建的文件，写入文件会覆盖原文件内容
    FileOutputStream outStream = context.openFileOutput(filename, context.MODE_PRIVATE);
    outStream.write(content.getBytes());
    outStream.close();
  }

}