我是 android 编程的新手,我希望实现一个具有 GridView 的画廊,然后推送到 View 寻呼机,但我在让它工作时遇到了一些问题。我目前只使用静态图像适配器就可以正常工作,但我不确定如何将其更改为使用 View 寻呼机。我还希望能够将自己的标题添加到每个屏幕,但我不确定该怎么做,或者它是否必须是要显示的图像名称?
我现在的代码是...
带有 GridView 的 .xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#3d3d3e" >
<GridView
android:id="@+id/gridview1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@+id/phone"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="3"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp" >
</GridView>
</RelativeLayout>
GridView .java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
public class Marble extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.marble);
GridView gridView = (GridView) findViewById(R.id.gridview1);
// Instance of ImageAdapter Class
gridView.setAdapter(new ImageAdapter1(this));
/**
* On Click event for Single Gridview Item
* */
gridView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity1.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
}
}
图像适配器.java
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
public class ImageAdapter1 extends BaseAdapter {
private Context mContext;
// Keep all Images in array
Integer[] mThumbIds = {
R.drawable.arabescato, R.drawable.biancocarrara,
R.drawable.botticinoclassico, R.drawable.calacattaoro,
R.drawable.cremamarfil, R.drawable.cremavalencia,
R.drawable.emperadordark, R.drawable.jurabeige,
R.drawable.neromarquina, R.drawable.perlatoolympo,
R.drawable.rojoalicante
};
// Constructor
public ImageAdapter1(Context c){
mContext = c;
}
@Override
public int getCount() {
return mThumbIds.length;
}
@Override
public Object getItem(int position) {
return mThumbIds[position];
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mThumbIds[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(265, 265));
return imageView;
}
}
最后是图像 Activity .java
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class FullImageActivity1 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter1 imageAdapter1 = new ImageAdapter1(this);
ImageView imageView = (ImageView) findViewById(R.id.fullimage);
imageView.setImageResource(imageAdapter1.mThumbIds[position]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
}
}
非常感谢所有对此的帮助,因为我完全被难住了!
提前致谢!
最佳答案
在继续之前,将 android.support.v4
jar 文件添加到您的项目中。
您需要两样东西:布局中的 ViewPager
和扩展 PagerAdapter
的适配器
首先将您的 full_image.xml
布局更改为:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
然后创建一个扩展 PagerAdapter
的适配器(ViewPager
需要)
public class ImagePagerAdapter extends PagerAdapter {
private List<ImageView> images;
public ImagePagerAdapter(List<ImageView> images) {
this.images = images;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imageView = images.get(position);
container.addView(imageView);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(images.get(position));
}
@Override
public int getCount() {
return images.size();
}
@Override
public boolean isViewFromObject(View view, Object o) {
return view == o;
}
}
在您的 FullImageActivity1
类中:
public class FullImageActivity1 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// Loop through the ids to create a list of full screen image views
ImageAdapter1 imageAdapter1 = new ImageAdapter1(this);
List<ImageView> images = new ArrayList<ImageView>();
for (int i = 0; i < imageAdapter1.getCount(); i++) {
ImageView imageView = new ImageView(this);
imageView.setImageResource(imageAdapter1.mThumbIds[i]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
images.add(imageView);
}
// Finally create the adapter
ImagePagerAdapter imagePagerAdapter = new ImagePagerAdapter(images);
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
viewPager.setAdapter(imagePagerAdapter);
// Set the ViewPager to point to the selected image from the previous activity
// Selected image id
int position = getIntent().getExtras().getInt("id");
viewPager.setCurrentItem(position);
}
}
总体思路是创建一个扩展 PagerAdapter
的适配器,以向 ViewPager
提供数据。更多信息,您可以访问Android Docs on PagerAdapter
关于Android 编程 ViewPager 从 GridView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15901996/