我想在ViewPager(使用PagerAdapter)中使用三个先前创建的活动,以便用户可以水平平滑地滚动它们.
我按照了一个很好的教程.问题出在他们使用TextViews演示的教程中.我已经完成了活动(布局在 XML文件中).我想现在在滑块中使用这些活动,但看起来我只能使用Views.
我无法弄清楚如何更改类的代码(从“implements Activity”到“extends View”),我可以在滑块中使用它.
我按照了一个很好的教程.问题出在他们使用TextViews演示的教程中.我已经完成了活动(布局在 XML文件中).我想现在在滑块中使用这些活动,但看起来我只能使用Views.
我无法弄清楚如何更改类的代码(从“implements Activity”到“extends View”),我可以在滑块中使用它.
我当前的代码如下所示:
public class HorizontalSliderBeispielActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); cxt = this; awesomeAdapter = new AwesomePagerAdapter(); awesomePager = (ViewPager) findViewById(R.id.awesomepager); awesomePager.setAdapter(awesomeAdapter); } ...
然后使用PageAdapter的内部类:
... private class AwesomePagerAdapter extends PagerAdapter { public Object instantiateItem(View collection,int position) { TextView tv = new TextView(cxt); tv.setText("Bonjour PAUG " + position); tv.setTextColor(Color.WHITE); tv.setTextSize(30); view_01 = new SubmitCheatInstructions(cxt); ((ViewPager) collection).addView(tv,0); ((ViewPager) collection).addView(view_01,1); return tv; } }
而不是TextView“tv”我想使用Activities(即SubmitCheatInstructions).以前这个班看起来像:
public class SubmitCheatInstructions implements Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.submitcheat_instructions); }
}
但据我所知,我必须改变它
public class SubmitCheatInstructions extends View { ???? }
为了能够将它用于ViewPager.
我现在的问题是我想将布局xml文件(submitcheat_instructions.xml)中的布局加载到该视图中,而不是在代码中执行所有操作.我无法弄清楚我该怎么做.
谢谢你的帮助.
解决方法
我按照相同的教程和你一样,我最初无法实现这一点,但经过一些修补和试错后,下面的代码就像一个魅力:
/** * Create the page for the given position. The adapter is responsible * for adding the view to the container given here,although it only * must ensure this is done by the time it returns from * {@link #finishUpdate()}. * * @param container * The containing View in which the page will be shown. * @param position * The page position to be instantiated. * @return Returns an Object representing the new page. This does not * need to be a View,but can be some other container of the * page. */ @Override public Object instantiateItem(View collection,int position) { View v = new View(PatientView.this.getApplicationContext()); final LayoutInflater inflater = (LayoutInflater) PatientView.this .getSystemService(Context.LAYOUT_INFLATER_SERVICE); switch (position) { case 0: v = inflater.inflate(R.layout.patientp1,(ViewGroup) null,false); ((Button) v.findViewById(R.id.pp1btnbck)).setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { finish(); } }); break; case 1: v = inflater.inflate(R.layout.patientp2,null,false ); break; default: TextView tv = new TextView(PatientView.this.context); tv.setText("Page " + position); tv.setTextColor(Color.WHITE); tv.setTextSize(30); v = tv; break; } ((ViewPager) collection).addView(v,0); return v; }
希望这有帮助,祝你好运谢里夫·马祖克