Question

嘿伙计我有下面的代码显示，它应该从第一个微调器中选择项目 - 诗人然后根据输入诗1,2或3显示另一个微调器。一旦从第二个微调器中选择一个项目它然后应该显示文本视图。

我的问题是，有时它会起作用，有时它会随机选择哪个微调器显示它看起来几乎每次从微调器2中选择一个项目时，文本视图几乎从不显示，而它通常是文本查看名为树的。

任何人都可以帮忙吗？我没有看到任何错误，所以我很困惑

代码：

public class Poets extends Activity implements  OnItemSelectedListener{

//defining variables
Spinner PoetSpinner, PoemSpinner1, PoemSpinner2, PoemSpinner3;
String Poets[] = {"","Robert Burns", "James Beattie", "Duncan MacGregor Crerar"};
String Poems1[] ={"", "Tam O Shanter", "Auld Lang Syne"};
String Poems2[] ={"", "Judgement Of Paris", "The Minstrel"};
String Poems3[] ={"", "A Poem Commemorating Robbie Burns", "My Bonnie Rowan Tree"};

TextView Tam, Auld, Judge, TheMin, rob, tree ;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //set to fullscreen mode
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN );
    //set content view 
    setContentView(R.layout.poet);

    initialize(); //call this method
}

public void initialize(){

    //initializing items that are in the class
    PoetSpinner = (Spinner) findViewById(R.id.spPoet);
    PoemSpinner1 = (Spinner) findViewById(R.id.spPoem1);
    PoemSpinner2 = (Spinner) findViewById(R.id.spPoem2);
    PoemSpinner3 = (Spinner) findViewById(R.id.spPoem3);
    Tam = (TextView) findViewById(R.id.tvSelectPoem1);
    Auld = (TextView) findViewById(R.id.tvSelectPoem2);
    Judge = (TextView) findViewById(R.id.tvSelectPoem3);
    TheMin = (TextView) findViewById(R.id.tvSelectPoem4);
    rob = (TextView) findViewById(R.id.tvSelectPoem5);
    tree = (TextView) findViewById(R.id.tvSelectPoem6);
    //setting up array adapters
    //
    //for each spinner
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.poet_arrays, android.R.layout.simple_spinner_item);
    ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.poem_arrays1, android.R.layout.simple_spinner_item);
    ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this, R.array.poem_arrays2, android.R.layout.simple_spinner_item);
    ArrayAdapter<CharSequence> adapter4 = ArrayAdapter.createFromResource(this, R.array.poem_arrays3, android.R.layout.simple_spinner_item);
    // Specify the layout to use when the list of choices appears
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    adapter4.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    // Apply the adapter to the spinner
    PoetSpinner.setAdapter(adapter);
    PoetSpinner.setOnItemSelectedListener(this);

    PoemSpinner1.setAdapter(adapter2);
    PoemSpinner1.setOnItemSelectedListener(this);

    PoemSpinner2.setAdapter(adapter3);
    PoemSpinner2.setOnItemSelectedListener(this);

    PoemSpinner3.setAdapter(adapter4);
    PoemSpinner3.setOnItemSelectedListener(this);

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

      String val = Poets[pos];
      String val2 = Poems1[pos];
      String val3 = Poems2[pos];
      String val4 = Poems3[pos];
       if (val.equals("Robert Burns")) {
          PoemSpinner2.setVisibility(Spinner.GONE);
          PoemSpinner1.setVisibility(Spinner.VISIBLE);
          PoemSpinner3.setVisibility(Spinner.GONE);
       }
       if (val.equals("James Beattie")) {
              PoemSpinner2.setVisibility(Spinner.VISIBLE);
              PoemSpinner1.setVisibility(Spinner.GONE);
              PoemSpinner3.setVisibility(Spinner.GONE);
           }
       if (val.equals("Duncan MacGregor Crerar")) {
            PoemSpinner2.setVisibility(Spinner.GONE);
            PoemSpinner1.setVisibility(Spinner.GONE);
            PoemSpinner3.setVisibility(Spinner.VISIBLE);
           }
       if (val2.equals("Tam O Shanter")) {
            Tam.setVisibility(View.VISIBLE);

            Auld.setVisibility(View.GONE);
            Judge.setVisibility(View.GONE);
            TheMin.setVisibility(View.GONE);
            tree.setVisibility(View.GONE);
            rob.setVisibility(View.GONE);
           }
       if (val2.equals("Auld Lang Syne")) {
            Auld.setVisibility(View.VISIBLE);

            Judge.setVisibility(View.GONE);
            TheMin.setVisibility(View.GONE);
            tree.setVisibility(View.GONE);
            Tam.setVisibility(View.GONE);
            rob.setVisibility(View.GONE);
           }
       if (val3.equals("Judgment Of Paris")) {
            Judge.setVisibility(View.VISIBLE);

            TheMin.setVisibility(View.GONE);
            tree.setVisibility(View.GONE);
            Tam.setVisibility(View.GONE);
            Auld.setVisibility(View.GONE);
            rob.setVisibility(View.GONE);
           }
       if (val3.equals("The Minstrel")) {
            TheMin.setVisibility(View.VISIBLE);

            tree.setVisibility(View.GONE);
            Tam.setVisibility(View.GONE);
            Auld.setVisibility(View.GONE);
            Judge.setVisibility(View.GONE);
            rob.setVisibility(View.GONE);
           }
       if (val4.equals("A Poem Commemorating Robbie Burns")) {
            rob.setVisibility(View.VISIBLE);

            tree.setVisibility(View.GONE);
            Tam.setVisibility(View.GONE);
            Auld.setVisibility(View.GONE);
            Judge.setVisibility(View.GONE);
            TheMin.setVisibility(View.GONE);
           }
       if (val4.equals("My Bonnie Rowan Tree")) 
            tree.setVisibility(View.VISIBLE);

            Tam.setVisibility(View.GONE);
            Auld.setVisibility(View.GONE);
            Judge.setVisibility(View.GONE);
            TheMin.setVisibility(View.GONE);
            rob.setVisibility(View.GONE);
           }


@Override
public void onNothingSelected(AdapterView<?> parent) {


}
}

Answer 1

我觉得你有点过分复杂的事情。你可以用2个微调器和只有一个textview来制作你想要的东西。第一个微调器将包含诗人，并且根据在此微调器中选择的诗人，您可以修改第二个微调器的内容，您可以在其中拥有所选诗人的诗歌。然后，您可以在第二个微调器中选择诗歌时在文本视图中显示所选诗歌的名称。我会尝试这样的事情：

    public class Poets extends Activity implements
OnItemSelectedListener {

  // defining variables
  Spinner PoetSpinner, PoemSpinner;
  String Poets[] = { "", "Robert Burns", "James Beattie",
  "Duncan MacGregor Crerar" };
  String Poems1[] = { "", "Tam O Shanter", "Auld Lang Syne" };
  String Poems2[] = { "", "Judgement Of Paris", "The Minstrel" };
  String Poems3[] = { "", "A Poem Commemorating Robbie Burns",
  "My Bonnie Rowan Tree" };

  TextView selectedPoem;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // set to fullscreen mode
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
      WindowManager.LayoutParams.FLAG_FULLSCREEN);
    // set content view
    setContentView(R.layout.poet);

    initialize(); // call this method
  }

  public void initialize() {

    // initializing items that are in the class
    PoetSpinner = (Spinner) findViewById(R.id.spPoet);
    PoemSpinner = (Spinner) findViewById(R.id.spPoem);
    // Hide the second spinner
    PoemSpinner.setVisibility(View.GONE);
    selectedPoem = (TextView) findViewById(R.id.tvSelectPoem1);
    // setting up array adapters
    //
    // for each spinner
    ArrayAdapter<CharSequence> adapter = ArrayAdapter
    .createFromResource(this, R.array.poet_arrays,
      android.R.layout.simple_spinner_item);
    // Specify the layout to use when the list of choices appears
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    // Apply the adapter to the spinner
    PoetSpinner.setAdapter(adapter);
    PoetSpinner.setOnItemSelectedListener(this);

    PoemSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

      public void onItemSelected(AdapterView<?> parent, View view,
        int position, long id) {
        Object poem = parent.getItemAtPosition(position);
        selectedPoem.setText(poem.toString());
      }

      public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

      }
    });
  }

  public void onItemSelected(AdapterView<?> parent, View view, int pos,
    long id) {
    ArrayAdapter<CharSequence> adapter = null;
    switch (pos) {
      case 1:
      adapter = ArrayAdapter.createFromResource(this,
        R.array.poem_arrays1, android.R.layout.simple_spinner_item);
      break;
      case 2:
      adapter = ArrayAdapter.createFromResource(this,
        R.array.poem_arrays2, android.R.layout.simple_spinner_item);
      break;
      case 3:
      adapter = ArrayAdapter.createFromResource(this,
        R.array.poem_arrays3, android.R.layout.simple_spinner_item);
      break;
      default:
      // Hide the poem spinner
      PoemSpinner.setVisibility(View.GONE);
      break;
    }

    if (adapter != null) {
      // Set the poem spinners content and show the spinner
      adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      PoemSpinner.setAdapter(adapter);
      PoemSpinner.setVisibility(View.VISIBLE);
    }
  }

  public void onNothingSelected(AdapterView<?> parent) {

  }

}

当然，您必须从xml中删除未使用的视图。我希望我足够清楚，代码可以按你的意愿运行。

纺纱厂不按他们的意愿工作，如何解决？

1 个答案: