半期考试 质数计算
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效果：
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>
.java
mainActivity.java
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().doInBackground(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)+"\\r\\n");
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);
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