<?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="wrap_content"        android:layout_height="wrap_content"        android:text="@string/fileName" />    <EditText        android:id="@+id/txtName"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:hint=""        android:maxLines="1" />    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/fileContext" />    <EditText        android:id="@+id/txtContext"        android:layout_width="fill_parent"        android:layout_height="100dp"        android:gravity="left"        android:hint=""        android:minLines="4" />    <Button        android:id="@+id/btnSave"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/btnSave" /></LinearLayout>

package apk.example.androidapk;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import android.app.Activity;import apk.example.service.FileServer;public class MainActivity extends Activity {    public Button btnSave;    public EditText txtName, txtContext;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        txtName = (EditText) findViewById(R.id.txtName);        txtContext = (EditText) findViewById(R.id.txtContext);        btnSave = (Button) findViewById(R.id.btnSave);        btnSave.setOnClickListener(new BtnSaveListener());    }    private final class BtnSaveListener implements View.OnClickListener {        @Override        public void onClick(View v) {            String fileName = txtName.getText().toString();            String fileContext = txtContext.getText().toString();            FileServer server = new FileServer(getApplicationContext());            try {                if (Environment.getExternalStorageState().equals(                        Environment.MEDIA_MOUNTED)) {                    server.saveToSDCard(fileName, fileContext);                    // 保存成功                    Toast.makeText(getApplicationContext(), R.string.success,                            Toast.LENGTH_LONG).show();                } else {                    // SDCard不存在或者写保护                    Toast.makeText(getApplicationContext(),                            R.string.sdCardMessage, Toast.LENGTH_LONG).show();                }            } catch (Exception e) {                // 保存失败                Toast.makeText(getApplicationContext(), R.string.fail,                        Toast.LENGTH_LONG).show();                e.printStackTrace();            }        }    }}

package apk.example.service;import java.io.File;import java.io.FileOutputStream;import android.content.Context;import android.os.Environment;public class FileServer {    private Context context;    public FileServer(Context context) {        this.context = context;    }    /**     *      * @param 文件名称     * @param 文件内容     * @throws 异常信息     */    public void save(String fileName, String fileContext) throws Exception {        // 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，另外采用私有操作模式创建的文件，写入文件中的内容会覆盖原文件的内容        FileOutputStream outStream = context.openFileOutput(fileName,                Context.MODE_PRIVATE);        outStream.write(fileContext.getBytes());        outStream.close();    }    /**     *      * @param 文件名称     * @param 文件内容     * @throws 异常信息     */    public void saveToSDCard(String fileName, String context) throws Exception {        // 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，另外采用私有操作模式创建的文件，写入文件中的内容会覆盖原文件的内容        File file = new File(Environment.getExternalStorageDirectory(),                fileName);        FileOutputStream outStream = new FileOutputStream(file);        outStream.write(context.getBytes());        outStream.close();    }}