實現功能：總共分三個模式 普通模式：數字0-100 困難模式：數字0-1000 地獄模式：數字0-10000 輸入數字，會提示大還是小，猜對了，三種提示，還會有猜測數字顯示

MainActivity.java代碼如下：

public class MainActivity extends AppCompatActivity {private Button General,Diffculty,Hell;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);InitView();Listener();}private void InitView(){General = findViewById(R.id.general);Diffculty = findViewById(R.id.difficulty);Hell = findViewById(R.id.hell);}private void Listener(){OnClick onClick = new OnClick();General.setOnClickListener(onClick);Diffculty.setOnClickListener(onClick);Hell.setOnClickListener(onClick);}private class OnClick implements View.OnClickListener{@Overridepublic void onClick(View v) {Intent intent = null;switch (v.getId()){case R.id.general:intent = new Intent(MainActivity.this,General.class);break;case R.id.difficulty:intent = new Intent(MainActivity.this,Difficulty.class);break;case R.id.hell:intent = new Intent(MainActivity.this,Hell.class);break;}startActivity(intent);}} }

activity_main.xml:效果圖如下：

activity_main.xml:代碼如下：

<?xml version="1.0" encoding="utf-8"?> <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="模式選擇"android:textSize="20sp"android:gravity="center"android:textColor="#000"/><Viewandroid:layout_width="match_parent"android:layout_height="1dp"android:background="#000"android:layout_marginTop="40dp"/><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:layout_marginTop="70dp"><Buttonandroid:id="@+id/general"android:layout_width="100dp"android:layout_height="wrap_content"android:text="普通模式(1-100)" /><Buttonandroid:id="@+id/difficulty"android:layout_width="100dp"android:layout_height="wrap_content"android:text="困難模式(1-1000)"android:layout_gravity="center"android:layout_marginLeft="60dp"/><Buttonandroid:id="@+id/hell"android:layout_width="100dp"android:layout_height="wrap_content"android:text="地獄模式(1-10000)"android:layout_marginLeft="50dp"/></LinearLayout></RelativeLayout>

建立三個活動分別為General，Difficulty，Hell,由于代碼相似，只展示普通模式的代碼，其余倆只更改隨機函數中的數值范圍即可
General.java代碼如下:

public class General extends AppCompatActivity {private EditText Number;private Button Submit;private TextView GuessNumberResult, GuessNumberTimes;private int intGuessNumber = 0;private int NumberOfGuesses = 0;private int RandomNumber = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_general);Number = findViewById(R.id.Number);Submit = findViewById(R.id.submit);GuessNumberResult = findViewById(R.id.GuessNumberResult);GuessNumberTimes = findViewById(R.id.GuessNumberTimes);RandomNumber = (int) (Math.random()*(100-1+1));Submit.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(final View v) {String StrGuessNumber = Number.getText().toString();try{intGuessNumber = Integer.parseInt(StrGuessNumber);}catch (NumberFormatException e){e.printStackTrace();}if (intGuessNumber < RandomNumber ){NumberOfGuesses++;GuessNumberResult.setVisibility(View.VISIBLE);GuessNumberTimes.setVisibility(View.VISIBLE);GuessNumberResult.setText("猜的數字偏小");GuessNumberTimes.setText("猜測次數："+NumberOfGuesses);}if (intGuessNumber > RandomNumber ){NumberOfGuesses++;GuessNumberResult.setVisibility(View.VISIBLE);GuessNumberTimes.setVisibility(View.VISIBLE);GuessNumberResult.setText("猜的數字偏大");GuessNumberTimes.setText("猜測次數："+NumberOfGuesses);}if (intGuessNumber == RandomNumber ){NumberOfGuesses++;GuessNumberResult.setVisibility(View.VISIBLE);GuessNumberTimes.setVisibility(View.VISIBLE);GuessNumberResult.setText("恭喜你，猜對了");GuessNumberTimes.setText("猜測次數："+NumberOfGuesses);}}});} }

activity_general.xml代碼如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".General"android:orientation="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="普通模式"android:textSize="20sp"android:gravity="center"android:layout_marginTop="10dp"android:textColor="#000"/><Viewandroid:layout_width="match_parent"android:layout_height="1dp"android:background="#000"android:layout_marginTop="10dp"/><RelativeLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"><TextViewandroid:id="@+id/Tips"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="Please enter the number you selected:"android:layout_marginTop="100dp"/><EditTextandroid:id="@+id/Number"android:layout_width="100dp"android:layout_height="40dp"android:layout_marginTop="90dp"android:layout_alignRight="@+id/Tips"android:layout_marginRight="50dp"/></RelativeLayout><Buttonandroid:id="@+id/submit"android:layout_width="100dp"android:layout_height="50dp"android:text="Submit"android:textAllCaps="false"android:layout_marginTop="30dp"android:layout_gravity="center"/><TextViewandroid:id="@+id/GuessNumberResult"android:layout_height="wrap_content"android:layout_width="match_parent"android:visibility="invisible"android:layout_marginTop="10dp"android:layout_gravity="center"android:gravity="center"android:textColor="#ff0000"/><TextViewandroid:id="@+id/GuessNumberTimes"android:layout_width="match_parent"android:layout_height="wrap_content"android:visibility="invisible"android:layout_marginTop="20dp"android:layout_gravity="center"android:gravity="center"android:textColor="#ff0000"/></LinearLayout>

效果圖展示：

總結

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