2

编辑:这个问题可能与BaseAdapter 导致 ListView 在滚动时出现故障有关


我的主应用程序屏幕使用 GridView 来显示图标网格。每个图标都有一个图像、名称和意图。我将 Activity 设置为处理方向更改,因此我可以更改背景。onCreate 方法使用 3 个不执行任何操作的测试图标和一个打开 PreferencesActivity 的首选项图标设置 GridView:

super.onCreate(savedInstanceState);
setContentView(R.layout.main);

GridView gv = (GridView) findViewById(R.id.main_grid);
if (getResources().getConfiguration().orientation ==
        Configuration.ORIENTATION_LANDSCAPE)
    gv.setBackgroundResource(R.drawable.main_bg_horiz);
else
    gv.setBackgroundResource(R.drawable.main_bg);

ArrayList<Icon> icons = new ArrayList<Icon>();
icons.add(new Icon("Test 1", R.drawable.test1, null));
icons.add(new Icon("Test 2", R.drawable.test2, null));
icons.add(new Icon("Test 3", R.drawable.test3, null));
icons.add(new Icon("Preferences", R.drawable.perferences, new Intent(this,
        AlertPreferences.class)));
IconAdapter ia = new IconAdapter(icons);
gv.setAdapter(ia);
gv.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3){
        Intent i = ((IconAdapter)arg0.getAdapter()).getItem(arg2).getIntent();
        if (i != null)
            HomeActivity.this.startActivity(i);
    }
});

而 onConfigurationChanged 非常简单:

super.onConfigurationChanged(newConfig);    
GridView gv = (GridView) findViewById(R.id.main_grid);

if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
    gv.setBackgroundResource(R.drawable.main_bg_horiz);
else
    gv.setBackgroundResource(R.drawable.main_bg);

背景变化很好,但代码引入了 GridView 的新问题。无论我在其中启动应用程序的任何方向都可以正常工作。但是,当我更改方向时,GridView 中图标的顺序会反转。当我将屏幕旋转回它开始的方向时,一切都会恢复正常。这里发生了什么?

4

2 回答 2

1

这实际上是自定义适配器的问题。问题和解决方案都在这里BaseAdapter 导致 ListView 在滚动时出现故障

于 2010-07-15T19:39:59.790 回答
0

尝试分离设置用户界面的逻辑:

GridView gv;

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    configureYourUIHere();    
}

public void configureYourUIHere(){
    gv = (GridView) findViewById(R.id.main_grid);
    if (getResources().getConfiguration().orientation ==
            Configuration.ORIENTATION_LANDSCAPE)
        gv.setBackgroundResource(R.drawable.main_bg_horiz);
    else
        gv.setBackgroundResource(R.drawable.main_bg);

    ArrayList<Icon> icons = new ArrayList<Icon>();
    icons.add(new Icon("Test 1", R.drawable.test1, null));
    icons.add(new Icon("Test 2", R.drawable.test2, null));
    icons.add(new Icon("Test 3", R.drawable.test3, null));
    icons.add(new Icon("Preferences", R.drawable.perferences, new Intent(this,
            AlertPreferences.class)));
    IconAdapter ia = new IconAdapter(icons);
    gv.setAdapter(ia);
    gv.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3){
            Intent i = ((IconAdapter)arg0.getAdapter()).getItem(arg2).getIntent();
            if (i != null)
                HomeActivity.this.startActivity(i);
        }
    });
}

public void onConfigurationChanged(Configuration newConfig){
    super.onConfigurationChanged(newConfig);    
    configureYourUIHere();
}
于 2010-06-19T20:12:00.610 回答