如何在删除元素后刷新线性布局视图

时间:2011-05-24 09:39:57

标签: refresh android-linearlayout

我有一个简单的应用程序,在一个活动中我取名和出生日期。我将它存储在数据库中。在主要活动中,我有linearlayout,它将显示所有名称。

当我单击主活动中的任何名称时,它应该从数据库中删除该名称并刷新视图。

我可以从数据库中删除条目,但我的线性布局视图没有更新。有人可以帮助。

public class child extends Activity {     私人意图;     私有LinearLayout布局;     private LayoutInflater linflater;     private int i = 0;     private Cursor cr;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.child);

    layout = (LinearLayout)findViewById(R.id.layout);
    Button addBtn = (Button)findViewById(R.id.AddButton);
    Button remBtn = (Button)findViewById(R.id.RemoveButton);
    intent = new Intent(this,login.class);

    layout = (LinearLayout) findViewById(R.id.mylayout1);
    linflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    //Check the database if there are any entries available. If available, then 
    //list them on the main screen
    final myDBAdapter mydb = new myDBAdapter(getApplicationContext());
    mydb.open();
    cr = mydb.GetMyData();
    if(cr.getCount()>0)
    {
        cr.moveToFirst();
        for (int i=0;i<cr.getCount();i++)
        {
            cr.moveToPosition(i);
            buildList(cr.getString(1),cr.getString(2));

        }
    }

    //Start the login activity which will return the newly added baby name
    addBtn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            startActivityForResult(intent, 1001);
        }
    }); 

    //Remove all the entries from Database
    remBtn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            if(cr.getCount()>0)
            {
                cr.moveToFirst();
                for (int i=0;i<cr.getCount();i++)
                {
                    Toast.makeText(getApplicationContext(), cr.getString(1),
                            Toast.LENGTH_LONG).show();
                    mydb.RemoveEntry(cr.getString(1));
                    cr.moveToPosition(i);
                }
            }
        }
    }); 

    mydb.close();

}


private void buildList(final String bname,String bsex)
{
    final View customView = linflater.inflate(R.layout.child_view,
            null);
    TextView tv = (TextView) customView.findViewById(R.id.TextView01);

    //tv.setId(i);
    tv.setText(bname);
    tv.setTextColor(getResources().getColor(R.color.black));

    tv.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        myDBAdapter mydb = new myDBAdapter(getApplicationContext());
        mydb.open();
        if (mydb.RemoveEntry(bname)>0)
        {
            Toast.makeText(getApplicationContext(), "Row deleted",
                    Toast.LENGTH_LONG).show();

/////////////////////////////////////////////// ////////////////////////////////////////////////// /////////////////////                在这需要什么来更新视图??? ////////////////////////////////////////////////// ////////////////////////////////////////////////// //////////////////////////

        }
        else
        {
            Toast.makeText(getApplicationContext(), "Row not deleted",
                    Toast.LENGTH_LONG).show();
        }
       }
    });

    layout.addView(customView);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    if(requestCode == 1001)
    {
        if(resultCode == RESULT_OK)
        {               
            Bundle extras = data.getExtras();
            buildList(extras.getString("bname"),extras.getString("bsex"));

        }
    }
}

}

1 个答案:

答案 0 :(得分:0)

嗯,我也试图让它发挥作用,你是否尝试过使用游戏循环每次说5秒钟刷新LinearLayout?这可能证明是有用的,因为它帮助我解决了我的问题http://aubykhan.wordpress.com/2010/04/25/android-game-programming-the-game-loop/

你也可以再次调用onCreate(Bundle)函数,而这是一个非常可怕的方法,它会起作用。