简易的记事本

MainActivity

package com.example.note20200608;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ClipboardManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Rect;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Locale;

//可优化的地方：用字符输出流。用同一的捕获异常，用share，
public class MainActivity extends AppCompatActivity implements TextToSpeech.OnInitListener {
    private static final String FILE_NAME = "memo";
    private  ImageView Iv_bc;
    private  ImageView Iv_qk;
    private ImageView Iv_ld;
    byte[] buffer = null;
    private long exitTime = 0;
    private TextToSpeech tts;//定义tts对象
    private String textView ;//定义文本对象，用于显示要朗读的文本
     EditText editText ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //——————
        editText =(EditText)findViewById(R.id.editText);
        tts =new TextToSpeech(this,this);//初始化TTS对象
        Iv_ld =(ImageView) super.findViewById(R.id.ld);//定义按钮对象并获取

Iv_ld.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        textView=editText.getText().toString();
        tts.speak(textView, TextToSpeech.QUEUE_FLUSH, null);//开始朗读，设置朗读的参数，第一个是播放源，第二参数是播放的模式
    }
});



        //——————————————————————————————

       // TextView etext = (TextView)findViewById(R.id.textView);
        Iv_bc = (ImageView) findViewById(R.id.bc);
        Iv_qk = (ImageView) findViewById(R.id.qk);

        Iv_bc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FileOutputStream fos =null;//声明文件输出流
                BufferedOutputStream bos =  new BufferedOutputStream(fos);//把低级的字节输出流包装成一个高级的缓冲字节输出流
                String text = editText.getText().toString();//获取输入的备忘信息
                try {

                    bos = new BufferedOutputStream(openFileOutput(FILE_NAME,MODE_PRIVATE));
                    //bos = openFileOutput()
                   // fos = openFileOutput("memo",MODE_PRIVATE);
                    bos.write(text.getBytes());//保存备忘信息
                    bos.flush();
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (bos != null) {
                        try {
                            bos.close();
                            Toast.makeText(MainActivity.this, "保存成功", Toast.LENGTH_LONG).show();
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }

            }
        });
        /*读取保存的备忘信息*/
        FileInputStream fis = null;//声明文件输入流对象
        BufferedInputStream bis = new BufferedInputStream(fis);
        try {
            //bos = new BufferedOutputStream(openFileOutput("meno",MODE_PRIVATE));
            bis = new BufferedInputStream(openFileInput(FILE_NAME));
           // bis = new BufferedInputStream(openFileOutput("memo"),MODE_PRIVATE);
            //bis=openFileInput("meno");
            //fis=openFileInput("memo");//获取文件输入流对象
            buffer=new byte[bis.available()];
            bis.read(buffer);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            if (bis != null) {
                try {

                    String data = new String(buffer);//把字符数组中的数据转换为字符串
                    editText.setText(data);//显示读取的内容
                    bis.close();//关闭输入对象
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        Iv_qk.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                editText.setText("");
            }
        });


    }
//
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu,menu);//getMenuInflater()方法得到MenuInflater
        return super.onCreateOptionsMenu(menu);
    }
//
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        //创建菜单项的点击事件
        switch (item.getItemId()) {
            case R.id.gy:
                Intent intent = new Intent(MainActivity.this,introduce.class);
                startActivity(intent);
                break;

            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }


    /* 复制到剪切板*/
    public void onClickCopy(View v) {
        // 从API11开始android推荐使用android.content.ClipboardManager
        // 为了兼容低版本我们这里使用旧版的android.text.ClipboardManager，虽然提示deprecated，但不影响使用。
        ClipboardManager cm = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
        // 将文本内容放到系统剪贴板里。
        cm.setText(editText.getText().toString());
        Toast.makeText(this, "复制成功", Toast.LENGTH_LONG).show();
    }

    /*双击退出*/
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            exit();
            return false;
        }
        return super.onKeyDown(keyCode, event);
    }

    public void exit() {
        if ((System.currentTimeMillis() - exitTime) > 2000) {
            Toast.makeText(getApplicationContext(), "再按一次退出程序",
                    Toast.LENGTH_SHORT).show();
            exitTime = System.currentTimeMillis();
        } else {
            finish();
            System.exit(0);
        }
    }

    @Override
    public void onInit(int status) {
        if(status == TextToSpeech.SUCCESS) {//如果状态成功的话
            int result = tts.setLanguage(Locale.CHINA);//设置语音为中文
            if (result == TextToSpeech.LANG_MISSING_DATA || result == TextToSpeech.LANG_NOT_SUPPORTED) {//如果朗读的数据不存在或是不支持
                Toast.makeText(this,"抱歉，不能进行朗读",Toast.LENGTH_LONG).show();//弹出消息提示框进行提示
            }
        }
    }


}

manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.note20200608">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAG" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/tubiao"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".introduce"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

String.xml

<resources>
    <string name="app_name">备忘录</string>
    <string name="bc">保存</string>
    <string name="qk">清空</string>
    <string name="ld">朗读</string>
    <string name="jqb">复制</string>
    <string name="editText">请输入文字</string>
    <string name="gy">关于</string>
    <string name="introduce"></string>
    <string name="vesion">版本：1.0.1</string>
    <string name="textview">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t版本信息：\n
    \t\t 1.0.1：优化存读数据的速度
    </string>

</resources>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.7" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="416dp"
        android:layout_height="418dp"
        android:layout_marginBottom="12dp"
        android:autofillHints=""
        android:ems="10"
        android:gravity="top"
        android:hint="@string/editText"
        android:inputType="textMultiLine"
        app:layout_constraintBottom_toTopOf="@+id/guideline3"
        app:layout_constraintStart_toStartOf="parent" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.5" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.84" />

    <ImageView
        android:id="@+id/bc"
        android:layout_width="146dp"
        android:layout_height="55dp"

        android:layout_marginTop="28dp"
        android:layout_marginEnd="28dp"
        android:layout_marginRight="28dp"
        android:contentDescription="@string/bc"
        android:src="@drawable/button"
        app:layout_constraintEnd_toStartOf="@+id/guideline4"
        app:layout_constraintTop_toTopOf="@+id/guideline3" />

    <ImageView
        android:id="@+id/ld"
        android:layout_width="147dp"
        android:layout_height="55dp"

        android:layout_marginEnd="24dp"
        android:layout_marginRight="24dp"
        android:layout_marginBottom="44dp"
        android:contentDescription="@string/ld"
        android:src="@drawable/button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline4" />

    <ImageView
        android:id="@+id/qk"
        android:layout_width="146dp"
        android:layout_height="55dp"

        android:layout_marginStart="28dp"
        android:layout_marginLeft="28dp"
        android:layout_marginTop="28dp"
        android:contentDescription="@string/qk"
        android:src="@drawable/button"
        app:layout_constraintStart_toStartOf="@+id/guideline4"
        app:layout_constraintTop_toTopOf="@+id/guideline3" />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="84dp"
        android:layout_marginRight="84dp"
        android:layout_marginBottom="64dp"
        android:text="@string/ld"
        android:textColor="#FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/guideline4" />

    <ImageView
        android:id="@+id/jqb"
        android:layout_width="146dp"
        android:layout_height="55dp"
        android:layout_marginStart="28dp"
        android:layout_marginLeft="28dp"
        android:layout_marginBottom="44dp"
        android:contentDescription="@string/jqb"
        android:onClick="onClickCopy"
        android:src="@drawable/button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline4" />

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="22dp"
        android:layout_marginTop="44dp"
        android:layout_marginEnd="84dp"
        android:layout_marginRight="84dp"
        android:text="@string/bc"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toStartOf="@+id/guideline4"
        app:layout_constraintTop_toTopOf="@+id/guideline3" />

    <TextView
        android:id="@+id/tv3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="84dp"
        android:layout_marginLeft="84dp"
        android:layout_marginBottom="64dp"
        android:text="@string/jqb"
        android:textColor="#FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline4" />

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="84dp"
        android:layout_marginLeft="84dp"
        android:layout_marginTop="44dp"
        android:text="@string/qk"
        android:textColor="#FFFFFF"
        app:layout_constraintStart_toStartOf="@+id/guideline4"
        app:layout_constraintTop_toTopOf="@+id/guideline3" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_begin="50dp" />

</androidx.constraintlayout.widget.ConstraintLayout>

activity_introduce.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".introduce">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:text="@string/introduce"
        android:textSize="36sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="108dp"
        android:layout_marginLeft="108dp"
        android:layout_marginBottom="40dp"
        android:text="@string/vesion"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="411dp"
        android:layout_height="321dp"
        android:layout_marginTop="136dp"
        android:text="@string/textview"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.35" />
</androidx.constraintlayout.widget.ConstraintLayout>

源码下载链接

链接：https://pan.baidu.com/s/1iV5F8SdGKebT9AZ2FTTjRQ
提取码：dgwv