NotePad学习笔记二

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.java

package 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);
    }

}