main activity
package com.opfiletext.example; import java.io.IOException; import com.opfiletext.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.TextView; import android.widget.Toast; public class MainActivity extends Activity { private EditText edit_filename, edit_filecontent; private Button submit, read; private TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); edit_filename = (EditText)findViewById(R.id.filename); edit_filecontent = (EditText)findViewById(R.id.finecontent); tv = (TextView)findViewById(R.id.tv); submit = (Button)findViewById(R.id.submit); submit.setOnClickListener(new SubminOnClickListener()); read = (Button)findViewById(R.id.read); read.setOnClickListener(new ReadOnClickListener()); } private final class SubminOnClickListener implements View.OnClickListener{ @Override public void onClick(View v) { String filename = edit_filename.getText().toString(); String filecontent = edit_filecontent.getText().toString(); FileService fm = new FileService(MainActivity.this); try { fm.save(filename, filecontent); Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_SHORT).show(); } catch (IOException e) { Toast.makeText(MainActivity.this, "保存失败", Toast.LENGTH_SHORT).show(); e.printStackTrace(); } } } private final class ReadOnClickListener implements View.OnClickListener{ @Override public void onClick(View v) { String filename = edit_filename.getText().toString(); FileService fm = new FileService(MainActivity.this); try { String content = fm.read(filename); tv.setText(content); } catch (IOException e) { tv.setText("解析异常"); e.printStackTrace(); } } } }
service class
package com.opfiletext.service; import java.io.ByteArrayOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import android.content.Context; public class FileService { private Context context; public FileService(Context context) { this.context = context; } public void save(String filename, String filecontent) throws IOException { FileOutputStream fos = context.openFileOutput(filename, Context.MODE_PRIVATE); fos.write(filecontent.getBytes()); fos.close(); } public String read(String filename) throws IOException{ FileInputStream fis = context.openFileInput(filename); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] b = new byte[1024]; int len = 0; while((len = fis.read(b)) > 0){ baos.write(b, 0, len); } byte[] data = baos.toByteArray(); return new String(data); } }