android sdk——listView的用法_protected listview mlistview;报错-优快云博客

本文链接：https://blog.youkuaiyun.com/luciaSY/article/details/38751255

本文介绍如何在Android应用中动态添加TextView和ListView控件，并实现ListView的滚动及点击事件响应，展示所选字符串。

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需求：

1.动态插入textView，listView的控件；

2.滚动listView，点击listView后显示选择的字符串；

效果：

代码：

private static final String[] array =
{
  "sunday","monday","tuesday","wednesday","thursday","friday","saturday",
  "one","two","three","four","five","six","seven","eight","nine","ten"
};

LinearLayout myLinearLayout;
TextView mTextView;
ListView mListView;

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

/*新建linearLayout*/
  myLinearLayout = new LinearLayout(this);
  myLinearLayout.setOrientation(LinearLayout.VERTICAL);
  myLinearLayout.setBackgroundColor(android.graphics.Color.WHITE);
  /*动态添加TextView到layout中去*/
  mTextView = new TextView(this);
  LinearLayout.LayoutParams param1 = new LinearLayout.LayoutParams
    (
     LinearLayout.LayoutParams.FILL_PARENT,
     LinearLayout.LayoutParams.WRAP_CONTENT
    );
  mTextView.setText("myListView");
  mTextView.setTextColor(getResources().getColor(R.drawable.blue));
  myLinearLayout.addView(mTextView, param1);

  /*动态添加ListView到layout中去*/
  mListView = new ListView(this);
  LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams
    (
     LinearLayout.LayoutParams.FILL_PARENT,
     LinearLayout.LayoutParams.WRAP_CONTENT
    );
  mListView.setBackgroundColor(getResources().getColor(R.drawable.gray));
  myLinearLayout.addView(mListView, param2);
  setContentView(myLinearLayout);

  ArrayAdapter<String> adapter =
    new ArrayAdapter<String>
  (this, R.layout.simple_text, array);
  mListView.setAdapter(adapter);
  mListView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

   @Override
   public void onItemSelected(AdapterView<?> arg0, View arg1,
     int arg2, long arg3) {
    // TODO Auto-generated method stub
    mTextView.setText("you choose   "+arg0.getSelectedItem().toString());
   }

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

   }

  });

  mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    // TODO Auto-generated method stub
    mTextView.setText("you chooseo "+array[arg2]);
   }
  });

重点：

1.在布局中动态增加控件的过程；

2.ListView的setOnItemSelectedListener，setOnItemClickListener的用法；注意内部参数的代表意思；

问题：

用模拟手机运行的setOnItemSelectedListener的效果没体现出来？