在Android中随机生成

我想做一个七个幸运抽奖的应用程序。这里是我的代码。但是我不知道为什么当我多次点击两个按钮时应用会停止。当我点击“CLEAR”后，“NEXT NUMBER”按钮将不会响应。有谁知道为什么？在Android中随机生成

MainActivity.java

public class MainActivity extends AppCompatActivity { 
TextView[] arr = new TextView[7]; 
int[] num = new int[6]; 
int count = 0; 
TextView number_7; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    arr[0] = ((TextView) findViewById(R.id.tv_number_one)); 
    arr[1] = ((TextView) findViewById(R.id.tv_number_two)); 
    arr[2] = (TextView)findViewById(R.id.tv_number_three); 
    arr[3] = (TextView)findViewById(R.id.tv_number_four); 
    arr[4] = (TextView)findViewById(R.id.tv_number_five); 
    arr[5] = (TextView)findViewById(R.id.tv_number_six); 
    number_7 = (TextView)findViewById(R.id.tv_number_seven); 

} 
@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 

    return super.onOptionsItemSelected(item); 
} 
public void generate(View v) 
{ 
    Random myRandom = new Random(); 
    if (count >= 7) { 
     clear(arr[0]); 
     clear(arr[1]); 
     clear(arr[2]); 
     clear(arr[3]); 
     clear(arr[4]); 
     clear(arr[5]); 
     clear(arr[6]); 
     for (TextView tv : arr) tv.setText("?"); 
    } 
    switch (count){ 
     case(0):{ 
      num[0]= myRandom.nextInt(48) + 1; 
      arr[0].setText(String.valueOf(num[0])); 
      break; 
     } 
     case(1):{ 
      num[1]= myRandom.nextInt(48) + 1; 
      arr[1].setText(String.valueOf(num[1])); 
      break; 
     } 
     case(2):{ 
      num[2]= myRandom.nextInt(48) + 1; 
      arr[2].setText(String.valueOf(num[2])); 
      break; 
     } 
     case(3):{ 
      num[3]= myRandom.nextInt(48) + 1; 
      arr[3].setText(String.valueOf(num[3])); 
      break; 
     } 
     case(4):{ 
      num[4]= myRandom.nextInt(48) + 1; 
      arr[4].setText(String.valueOf(num[4])); 
      break; 
     } 
     case(5):{ 
      num[5]= myRandom.nextInt(48) + 1; 
      arr[5].setText(String.valueOf(num[5])); 
      break; 
     } 
     case(6):{ 
      int num_7; 
      Arrays.sort(num); 
      num_7= myRandom.nextInt(48) + 1; 
      arr[0].setText(String.valueOf(num[0])); 
      arr[1].setText(String.valueOf(num[1])); 
      arr[2].setText(String.valueOf(num[2])); 
      arr[3].setText(String.valueOf(num[3])); 
      arr[4].setText(String.valueOf(num[4])); 
      arr[5].setText(String.valueOf(num[5])); 
      number_7.setText(String.valueOf(num_7)); 
      break; 
     } 

    } 
    count++; 


} 
public void clear(View v){ 
    TextView num_1 = (TextView)findViewById(R.id.tv_number_one); 
    num_1.setText("?"); 
    TextView num_2 = (TextView)findViewById(R.id.tv_number_two); 
    num_2.setText("?"); 
    TextView num_3 = (TextView)findViewById(R.id.tv_number_three); 
    num_3.setText("?"); 
    TextView num_4 = (TextView)findViewById(R.id.tv_number_four); 
    num_4.setText("?"); 
    TextView num_5 = (TextView)findViewById(R.id.tv_number_five); 
    num_5.setText("?"); 
    TextView num_6 = (TextView)findViewById(R.id.tv_number_six); 
    num_6.setText("?"); 
    TextView num_7 = (TextView)findViewById(R.id.tv_number_seven); 
    num_7.setText("?"); 
} 
}

activity_main

<TextView android:text="\?" android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:id="@+id/tv_number_one" 
    android:textSize="30sp" 
    android:textIsSelectable="true" 
    android:layout_marginLeft="10dp" 
    android:textColor="#67ceff" 
    android:layout_marginStart="20dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_two" 
    android:layout_alignBottom="@+id/tv_number_one" 
    android:layout_toRightOf="@+id/tv_number_one" 
    android:layout_toEndOf="@+id/tv_number_one" 
    android:textColor="#67ceff" 
    android:textSize="30sp" 
    android:layout_marginLeft="20dp" 
    android:layout_marginStart="20dp" 
    /> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_three" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/tv_number_two" 
    android:layout_toEndOf="@+id/tv_number_two" 
    android:layout_marginLeft="20dp" 
    android:textColor="#67ceff" 
    android:textSize="30sp" 
    android:layout_marginStart="20dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_four" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/tv_number_three" 
    android:layout_toEndOf="@+id/tv_number_three" 
    android:textColor="#67ceff" 
    android:textSize="30sp" 
    android:textIsSelectable="true" 
    android:layout_marginLeft="20dp" 
    android:layout_marginStart="20dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_five" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/tv_number_four" 
    android:layout_toEndOf="@+id/tv_number_four" 
    android:layout_marginLeft="20dp" 
    android:textColor="#67ceff" 
    android:textSize="30sp" 
    android:layout_marginStart="20dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_six" 
    android:layout_alignBottom="@+id/tv_number_five" 
    android:layout_toRightOf="@+id/tv_number_five" 
    android:layout_toEndOf="@+id/tv_number_five" 
    android:textColor="#67ceff" 
    android:textSize="30sp" 
    android:layout_marginLeft="20dp" 
    android:layout_marginStart="20dp"/> 

<TextView 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="\?" 
    android:id="@+id/tv_number_seven" 
    android:layout_alignParentTop="true" 
    android:layout_toRightOf="@+id/tv_number_six" 
    android:layout_toEndOf="@+id/tv_number_six" 
    android:layout_marginLeft="20dp" 
    android:textColor="#6198ff" 
    android:textSize="30sp" 
    android:layout_marginStart="20dp"/> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="NEXT NUMBER" 
    android:id="@+id/button_next_num" 
    android:layout_below="@+id/tv_number_one" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="41dp" 
    android:onClick="generate"/> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="CLEAR" 
    android:id="@+id/button_clear" 
    android:onClick="clear" 
    android:layout_alignTop="@+id/button_next_num" 
    android:layout_toRightOf="@+id/tv_number_six" 
    android:layout_toEndOf="@+id/tv_number_six" 
    android:layout_marginLeft="30dp" />

来源

2015-10-25 Joey Li

你需要做一个for循环 – Breavyn

@ColinGillespie但是，如果使用for循环，应用程序将同时生成7个相同的数字。 –

编辑：根据您的更新问题

增量count为你做的最后一件事。

// check if the count is too high first 
if (count >= 7) { 
    // desired behaviour if count is too high 
    // clear(); //? 
} 

num[count] = myRandom.nextInt(48) + 1; 
views[count].setText(String.valueOf(num[count])); 
count++;

原始

对不起，我没有在第一次明白的问题。

我会创建一个TextView的列表，并维护一个计数器，该应用程序要使用哪个编号。

TextView[] views = new TextView[7]; 
int[] randomNumbers = new int[7]; 
int counter = 0; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    views[0] = (TextView) findViewById(R.id.tv_number_one); 
    views[1] = (TextView) findViewById(R.id.tv_number_two); 
    // etc, etc 
}

下一个按钮侦听

@Override 
public void onClick(View v) { 
    // check if there are any more numbers required (don't want to cause a NPE) 

    // generate a new random number 
    // check if it is unique in the list 
    // if not generate a new number and repeat 

    // when you have a unique number save it to 
    // randomNumbers[counter] and display it in views[counter] 
    // increment the counter 
}

清除按钮侦听

@Override 
public void onClick(View v) { 
    // clear list, clear views, reset counter 
    randomNumbers = new int[7]; 
    for (TextView tv : views) tv.setText("?"); 
    counter = 0; 
}

来源

2015-10-25 09:22:24 Breavyn

Viewlist产品不能得到解决 –

@JoeyLi看到编辑 – Breavyn

然后加入解决不了..... –

在Android中随机生成

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