NotePad学习笔记二
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根据学习笔记一完成一些代码，贴出来看看：
Notepad.java
package com.example.notepad;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.BroadcastReceiver;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.content.IntentFilter;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.os.Bundle;import android.os.Environment;import android.util.AttributeSet;import android.util.Log;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.EditText;// TODO: Auto-generated Javadoc/** * The Class Notepad. */public class Notepad extends Activity { /** The et. */ private EditText et; /** The Constant RECOGNIZER. */ private static final int RECOGNIZER = 1001; // Intent返回结果验证码 /** The filename. */ private String filename = "新建文档.txt"; // 保存文本时默认文件名 /** The my dialog edit text. */ private EditText myDialogEditText; public static final String INTENAL_ACTION_1 = "com.example.notpad.Internal_1"; static Notepad activity = null; private BroadcastReceiver bcrIntenal1 = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String msg = intent.getStringExtra("message"); // Toast.makeText(context, "动态:" + msg, 0).show(); try { // byteFile.writeToFile(msg); save(); Log.v("msg", "save in temporary file automatic (temp.txt)"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }; public static class LinedEditText extends EditText { private Rect mRect; private Paint mPaint; // This constructor is used by LayoutInflater public LinedEditText(Context context, AttributeSet attrs) { super(context, attrs); // Creates a Rect and a Paint object, and sets the style and color // of the Paint object. mRect = new Rect(); mPaint = new Paint(); mPaint.setStyle(Paint.Style.STROKE); mPaint.setColor(0x800000FF); } public static Activity getActivity() { return activity; } /** * This is called to draw the LinedEditText object * * @param canvas The canvas on which the background is drawn. */ @Override protected void onDraw(Canvas canvas) { // Gets the number of lines of text in the View. int count = getLineCount(); // Gets the global Rect and Paint objects Rect r = mRect; Paint paint = mPaint; /* * Draws one line in the rectangle for every line of text in the * EditText */ for (int i = 0; i < count; i++) { // Gets the baseline coordinates for the current line of text int baseline = getLineBounds(i, r); /* * Draws a line in the background from the left of the rectangle * to the right, at a vertical position one dip below the * baseline, using the "paint" object for details. */ canvas.drawLine(r.left, baseline + 1, r.right, baseline + 1, paint); } // Finishes up by calling the parent method super.onDraw(canvas); } } /* * (non-Javadoc) * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); et = (EditText) findViewById(R.id.EditText01); activity = this; // 动态注册广播消息 registerReceiver(bcrIntenal1, new IntentFilter( INTENAL_ACTION_1)); Intent serviceIntent = new Intent(Notepad.this, MyService.class); startService(serviceIntent); } public static Activity getActivity() { return activity; } // public void onStart() { // Intent intent = this.getIntent(); // System.out.println(intent.getStringExtra("data")); // et.setText(intent.getStringExtra("data")); // } /* * (non-Javadoc) * @see android.app.Activity#onResume() */ public void onResume() { // 重写onResume,防止程序stop后编辑内容丢失 super.onResume(); registerReceiver(bcrIntenal1, new IntentFilter( INTENAL_ACTION_1));// try {// File file = new File("/mnt/sdcard/Notepad/temp1.txt"); // 读取临时文件，恢复上一次编辑内容// RandomAccessFile stream = new RandomAccessFile(file, "rw");// String s = stream.readLine();// stream.close();// et.setText(s);// } catch (Exception e) {// // TODO: handle exception// e.printStackTrace();// } }// public void onStop() {// super.onStop();// unregisterReceiver(bcrIntenal1);// } /* * (non-Javadoc) * @see android.app.Activity#onPause() */ public void onPause() { // 编辑内容存入临时文件 super.onPause(); unregisterReceiver(bcrIntenal1);// File file = new File("/mnt/sdcard/Notepad/temp1.txt");// String data = et.getText().toString();//// try {//// RandomAccessFile stream = new RandomAccessFile(file, "rw");// stream.writeBytes(data);// stream.close();// } catch (Exception e) {// // TODO Auto-generated catch block// e.printStackTrace();// } } /* * (non-Javadoc) * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu) */ public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } /* * (non-Javadoc) * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem) */ public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menuItemNew: creatNote(); return true; case R.id.menuItemOpen: openNote(); return true; case R.id.menuItemSave: saveNote(); return true; } return super.onOptionsItemSelected(item); } /** * Creat note. */ private void creatNote() { et.setText(""); } /** * Open note. */ private void openNote() { Intent list = new Intent(this, OpenNote.class); startActivityForResult(list, RECOGNIZER); } /* * (non-Javadoc) * @see android.app.Activity#onActivityResult(int, int, * android.content.Intent) */ protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == RECOGNIZER && resultCode == RESULT_OK) { String text = data.getExtras().getString("data"); et.setText(text); } super.onActivityResult(requestCode, resultCode, data); } private void save() { File sdcardDir = Environment .getExternalStorageDirectory(); String path = sdcardDir.getName() + "/Notepad"; File f = new File(path); String fileName = path + java.io.File.separator + "temp.txt"; java.io.BufferedWriter bw; try { bw = new java.io.BufferedWriter( new java.io.FileWriter( new java.io.File(fileName))); String str = et.getText().toString(); bw.write(str, 0, str.length()); bw.newLine(); bw.close(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } /** * Save note. */ private void saveNote() { LayoutInflater factory = LayoutInflater.from(this); final View textEntryView = factory.inflate( R.layout.save_dialog, null); Builder builder = new AlertDialog.Builder(Notepad.this); builder.setView(textEntryView); myDialogEditText = (EditText) textEntryView .findViewById(R.id.myDialogEditText); myDialogEditText.setText(filename); builder.setTitle("保存"); builder.setPositiveButton(R.string.str_alert_ok, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub File sdcardDir = Environment .getExternalStorageDirectory(); String path = sdcardDir.getName() + "/Notepad"; File f = new File(path); File[] files = f.listFiles(); filename = myDialogEditText.getText() .toString(); for (int i = 0; i < files.length; i++) { // 存在同名文件 File file = files[i]; // Log.v("name", file.getName().toString()); if (file.getName().toString() .equals(filename)) { new AlertDialog.Builder(Notepad.this) .setTitle("文件名重复，请重新输入") .setPositiveButton("OK", null) .show(); } } String fileName = path + java.io.File.separator + myDialogEditText.getText() .toString(); java.io.BufferedWriter bw; try { bw = new java.io.BufferedWriter( new java.io.FileWriter( new java.io.File(fileName))); String str = et.getText().toString(); bw.write(str, 0, str.length()); bw.newLine(); bw.close(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } } }); builder.setNegativeButton(R.string.str_alert_cancel, null); builder.show(); }}OpenNote.javapackage com.example.notepad;import java.io.File;import java.io.FileInputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.TextView;import android.widget.Toast;// TODO: Auto-generated Javadoc/** * The Class OpenNote. */public class OpenNote extends Activity { /** Called when the activity is first created. */ private ListView listview; /** The items. */ private ArrayList<String> items = null; /** The paths. */ private ArrayList<String> paths = null; /** The root path. */ private String rootPath = "/"; // 根目录 /** The m path. */ private TextView mPath; // 当前路径 /** The currentpath. */ String currentpath; /** The list items. */ private List<Map<String, Object>> listItems = null; /* (non-Javadoc) * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.open_note); init(); getFileDir(rootPath); } /** * Gets the file dir. * * @param filePath the file path * @return the file dir */ private void getFileDir(String filePath) { mPath.setText("当前目录：" + filePath); currentpath = filePath; List<Map<String, Object>> listItems = new ArrayList<Map<String, Object>>(); items = new ArrayList<String>(); paths = new ArrayList<String>(); File f = new File(filePath); File[] files = f.listFiles(); Map<String, Object> listItem = new HashMap<String, Object>(); if (!filePath.equals(rootPath)) { items.add("cd /"); paths.add(rootPath); items.add("cd .."); paths.add(f.getParent()); listItem.put("header", R.drawable.back01); listItem.put("name", "cd /"); listItems.add(listItem); Map<String, Object> listItem1 = new HashMap<String, Object>(); listItem1.put("header", R.drawable.back02); listItem1.put("name", "cd .."); listItems.add(listItem1); } for (int i = 0; i < files.length; i++) { Map<String, Object> listItem2 = new HashMap<String, Object>(); File file = files[i]; items.add(file.getName()); paths.add(file.getPath()); if (file.isDirectory()) { listItem2.put("header", R.drawable.folder); } else { String pathStr = file.getAbsolutePath(); if (pathStr .matches("[^\\S]+(\\.avi|\\.mp4|\\.rmvb)$")) { listItem2.put("header", R.drawable.video); } else if (pathStr.matches("[^\\S]+(\\.asv|\\.mp3)$")) { listItem2.put("header", R.drawable.audio); } else if (pathStr .matches("[^\\S]+(\\.jpg|\\.png|\\.gif)$")) { listItem2.put("header", R.drawable.image); } else { listItem2.put("header", R.drawable.doc); } } listItem2.put("name", file.getName()); listItems.add(listItem2); } String[] from = { "header", "name" }; int[] to = { R.id.header, R.id.name }; SimpleAdapter adapter = new SimpleAdapter(this, listItems, R.layout.file_row, from, to); listview.setAdapter(adapter); } /** * Inits the. */ public void init() { listview = (ListView) findViewById(R.id.file_listview); mPath = (TextView) findViewById(R.id.current_path); listview.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) { File file = new File(paths.get(position)); if (file.canRead()) { if (file.isDirectory()) { getFileDir(paths.get(position)); } else { String data = "fail"; try { FileInputStream stream = new FileInputStream( paths.get(position)); StringBuffer sb = new StringBuffer(); int c; while ((c = stream.read()) != -1) { sb.append((char) c); } stream.close(); data = sb.toString(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } Intent i = getIntent(); i.putExtra("data", data); setResult(RESULT_OK, i); finish(); } } else { Toast toast = Toast.makeText(OpenNote.this, "您的权限不足！", Toast.LENGTH_LONG); toast.show(); } } }); } /* (non-Javadoc) * @see android.app.Activity#onKeyDown(int, android.view.KeyEvent) */ @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == event.KEYCODE_BACK) { if (currentpath == rootPath) { File f = new File(currentpath); getFileDir(currentpath); } else { File f = new File(currentpath); getFileDir(f.getParent()); } } return super.onKeyDown(keyCode, event); }}- NotePad学习笔记二
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