• exam02-02


    权限声明

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.exam02_2">
    
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity
                android:name=".HistoryActivity"
                android:label="计算结果">
            </activity>
            <activity android:name=".MainActivity"
                android:label="质数计算">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>
    

    布局文件
    activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp"
        android:orientation="vertical">
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="开始 : " />
    
            <EditText
                android:id="@+id/editText_start"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Please input start"
                android:inputType="number" />
    
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="结束 : " />
    
            <EditText
                android:id="@+id/editText_end"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Please input end"
                android:inputType="number" />
    
        </LinearLayout>
    
        <TextView
            android:id="@+id/num_result"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:layout_marginTop="10dp"
            android:text="已经计算出了0个质数" />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
    
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:orientation="horizontal">
    
                <Button
                    android:id="@+id/start"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="10dp"
                    android:onClick="start"
                    android:text="开始计算" />
    
                <Button
                    android:id="@+id/end"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:onClick="end"
                    android:text="结束计算" />
    
            </LinearLayout>
    
        </LinearLayout>
    
    </LinearLayout>
    
    

    activity_history.xml

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.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=".HistoryActivity">
    
        <ListView
            android:id="@+id/listview"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginStart="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </android.support.constraint.ConstraintLayout>
    

    notification_layout.xml

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:orientation="horizontal">
    
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher_round" />
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
    
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
    
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="计算完成"
                    android:textSize="20sp" />
    
                <TextView
                    android:id="@+id/time"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="11:23" />
    
            </LinearLayout>
    
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
    
                <TextView
                    android:id="@+id/count"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="end"
                    android:text="共有10个质数" />
    
            </LinearLayout>
    
        </LinearLayout>
    
    </LinearLayout>
    

    MainActivity.xml

    package com.example.exam02_2;
    
    import android.Manifest;
    import android.app.Notification;
    import android.app.NotificationChannel;
    import android.app.NotificationManager;
    import android.app.PendingIntent;
    import android.content.Intent;
    import android.content.Context;
    import android.content.pm.PackageManager;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.os.AsyncTask;
    import android.os.Environment;
    import android.support.annotation.NonNull;
    import android.support.v4.app.ActivityCompat;
    import android.support.v4.app.NotificationCompat;
    import android.support.v4.content.ContextCompat;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.EditText;
    import android.widget.RemoteViews;
    import android.widget.TextView;
    
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    
    public class MainActivity extends AppCompatActivity {
    
        private EditText editText_start;
        private EditText editText_end;
        private TextView textView_result;
        private boolean flag;
        ArrayList<Integer> history = new ArrayList<Integer>();
    
        private final static String myChannel = "lys";
        public final static String filename = "historyList";
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            init();
    
            if(ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)!= PackageManager.PERMISSION_GRANTED){
                ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},0);
    
            }
    
    
    
    
        }
    
        public void init(){
            editText_end = findViewById(R.id.editText_end);
            editText_start = findViewById(R.id.editText_start);
            textView_result = findViewById(R.id.num_result);
            flag = true;
        }
    
        public void start(View v){
            int begin = Integer.parseInt(editText_start.getText().toString());
            int end = Integer.parseInt(editText_end.getText().toString());
            flag = true;
            new MyAsyncTask().execute(begin,end);
        }
    
        public void end(View v){
            flag =false;
        }
    
        public void save(){
            try{
                File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
                File file = new File(path,filename);
                FileOutputStream out = new FileOutputStream(file,true);
                OutputStreamWriter writer = new OutputStreamWriter(out);
    
                for(int i=0;i<history.size();i++){
                    writer.write("第"+(i+1)+"个质数是:"+history.get(i)+"
    ");
                }
                writer.close();
                out.close();
                //BufferedOutputStream writer=new BufferedOutputStream(new OutputStream(out));
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    
        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            if(requestCode == 0){
                if(grantResults[0]==PackageManager.PERMISSION_GRANTED){
    
                }else{
                    ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},0);
                }
            }
        }
    
        //显示History菜单
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            MenuInflater inflater = getMenuInflater();
            inflater.inflate(R.menu.main_menu,menu);
            return super.onCreateOptionsMenu(menu);
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()){
                case R.id.action_history:
                   // saveHistory();
                    save();
                    Intent intent = new Intent(MainActivity.this, HistoryActivity.class);
                    //intent.putStringArrayListExtra("history",res_list);
                    startActivity(intent);
                    return true;
            }
            return super.onOptionsItemSelected(item);
        }
    
        public void sendNotification(Integer integer){
            //NotificationManager管理通知
            NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
                //Builder构造器创建Notification对象
                //NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
                NotificationChannel channel = new NotificationChannel(myChannel,"my result notification",NotificationManager.IMPORTANCE_DEFAULT);
    
                manager.createNotificationChannel(channel);
                NotificationCompat.Builder builder = new NotificationCompat.Builder(this,myChannel);
    
                RemoteViews remoteViews = new RemoteViews(getPackageName(),R.layout.notification_layout);
                remoteViews.setTextViewText(R.id.time,new SimpleDateFormat("HH:mm").format(System.currentTimeMillis()));
                remoteViews.setTextViewText(R.id.count,"共有"+integer+"个质数");
    
                builder.setContent(remoteViews);
                //延迟意图
    //            Intent intent = new Intent(this,MainActivity.class);
    //            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                //builder.setContentIntent(pendingIntent);
    
                manager.notify(100,builder.build());
    
            }
    
        }
    
        public void initNotification(){
            Bitmap btm = BitmapFactory.decodeResource(getResources(),
                    R.mipmap.ic_launcher);
            NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
                    MainActivity.this)
                    .setContentTitle("计算完成")
                    .setContentText("共有"+history.size()+"个质数");
            mBuilder.setTicker("New message");//第一次提示消息的时候显示在通知栏上
            mBuilder.setNumber(12);
            mBuilder.setLargeIcon(btm);
            mBuilder.setAutoCancel(true);//自己维护通知的消失
    
            //构建一个Intent
            Intent resultIntent = new Intent(MainActivity.this,
                    MainActivity.class);
            //封装一个Intent
            PendingIntent resultPendingIntent = PendingIntent.getActivity(
                    MainActivity.this, 0, resultIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT);
            // 设置通知主题的意图
            mBuilder.setContentIntent(resultPendingIntent);
            //获取通知管理器对象
            NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            mNotificationManager.notify(0, mBuilder.build());
    
        }
    
    
        class MyAsyncTask extends AsyncTask<Integer,Integer,Integer>{
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                textView_result.setText("已经算出了0个质数");
            }
    
            @Override
            protected void onPostExecute(Integer integer) {
                super.onPostExecute(integer);
                //sendNotification(integer);
                //initNotification();
            }
    
            @Override
            protected void onProgressUpdate(Integer... values) {
                super.onProgressUpdate(values);
                textView_result.setText("已经算出了"+values[0]+"个质数");
            }
    
            @Override
            protected Integer doInBackground(Integer... integers) {
                for (int i=integers[0]; flag&&i<=integers[1]; i++) {
                    boolean isPrime=true;
                    for (int j=2; j<=Math.sqrt(i); j++) {
    
                        if(i%j==0) {
                            isPrime=false;
                            break;
                        }
                        try {
                            Thread.sleep(50);
                        }   catch (InterruptedException e) {
                            e.printStackTrace();
                        }
    
                    }
                    if (isPrime){
                        //i是素数
                        history.add(i);
                    }
                    publishProgress(history.size());
                }
                initNotification();
                return history.size();
            }
        }
    }
    
    
    
    

    HistoryActivity.xml

    package com.example.exam02_2;
    
    import android.os.Environment;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.BufferedReader;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    import java.util.ArrayList;
    import java.util.List;
    
    public class HistoryActivity extends AppCompatActivity {
    
        private ListView listView;
        private List<String> historyList = new ArrayList<>();
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_history);
            readFile();
            listView = findViewById(R.id.listview);
            ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,historyList);
            listView.setAdapter(adapter);
        }
    
    
        public void readFile(){
            File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
            File file = new File(path,MainActivity.filename);
            try {
                FileInputStream fis = new FileInputStream(file);
                InputStreamReader reader = new InputStreamReader(fis);
                BufferedReader  br = new BufferedReader(reader);
                String line = "";
                while((line=br.readLine())!=null) {
                    historyList.add(line.trim());
                }
                br.close();
                reader.close();
                fis.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }catch (Exception e){
                e.printStackTrace();
            }
    
        }
    }
    
    
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  • 原文地址:https://www.cnblogs.com/lyszyl/p/10821736.html
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