将字符串添加到适配器

Question

我有一个适配器，我想向它添加一个字符串，但是当我运行此代码时，它只在songstoadd 变量中添加最后一个字符串......这是一个自定义适配器，它在必要的地方但在数组中添加分隔符适配器我想要一个名称中第一个字母相同的所有字符串....

SeparatedListAdapter adapter = new SeparatedListAdapter(this);
     ArrayList<String> songstoadd = new ArrayList<String>();

              Collections.sort(songtitle);
              int m = 0;
              while( m <songtitle.size()-1){
                  if(songtitle.get(m).substring(0, 1) == songtitle.get(m+1).substring(0, 1)){
                      m++;
                  }else{
                   songstoadd.clear();
                   songstoadd.add(songtitle.get(m));

                adapter.addSection(songtitle.get(m).substring(0, 1), new ArrayAdapter<String>(getApplicationContext(),R.layout.song, songstoadd));

              m++;
                  }



      }
              setListAdapter(adapter);

        }

Answer 1

试试这个，然后告诉我会发生什么..

songstoadd.clear();
 while( m <songtitle.size()-1){
                  if(songtitle.get(m).substring(0, 1).equals( songtitle.get(m+1).substring(0, 1))){
                      m++;
                  }else{

                songstoadd.add(songtitle.get(m));
                adapter.addSection(songtitle.get(m).substring(0, 1), new ArrayAdapter<String>(getApplicationContext(),R.layout.song, songstoadd));

              m++;
                  }

更多信息请看

Android: how to use SectionIndexer

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Answer 2

尝试如下更改您的 while 并尝试..

while(m <songtitle.size()-1){
     if(songtitle.get(m).substring(0, 1) == songtitle.get(m+1).substring(0, 1)){
         songstoadd.add(songtitle.get(m));
         m++;
     }else{

         songstoadd.add(songtitle.get(m));

         adapter.addSection(songtitle.get(m).substring(0, 1), new ArrayAdapter<String>(getApplicationContext(),R.layout.song, songstoadd));

         songstoadd.clear();

         m++;
    }
}