堆栈跟踪
值不会传递给其他意图。每次我尝试以其中的意图启动活动时，它都会崩溃。
//This activity will retrieve and display the different rewards that are available.
public class RewardsActivity extends Activity {
@Override
public void onCreate(Bundle SavedInstanceState)
{
super.onCreate(SavedInstanceState);
setContentView(R.layout.rewards);
//stores retrieves and stores the current gridview
GridView gridView = (GridView)findViewById(R.id.grid_view);
//Instance of ImageAdapter class that will load the images into the gridview
gridView.setAdapter(new ImageAdapter(this));
//This function is used to set a listener on each item in the grid so that when its clicked it will go to the other view.
gridView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v,int position, long id)
{
Intent i = new Intent(getApplicationContext(),RewardsViewActivity.class);
i.putExtra("id", position);
startActivity(i);
}
});
}
这个新意图被传递给，当它被传递到这里时，它被存储在一个变量中，然后用于ImageView加载图像。
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class RewardsViewActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_view);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ImageAdapter imageAdapter = new ImageAdapter(this);
ImageView imageView = (ImageView) findViewById(R.id.full_image);
imageView.setImageResource(imageAdapter.finalImages[position]);
}
}
ImageAdapter.java 包 org.android.pps；
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
/*This class will be used handle the loading of the image view that will display all the
images of the rewards. (this will be used along with RewardsActivity and rewards.xml)
*/
public class ImageAdapter extends BaseAdapter {
//variable that will store the current context of the application
private Context c;
private Integer num = 6;
private int[] rewards_num=new int[num];
private Integer[] Images = new Integer[6];
public Integer[] finalImages;
//for loop will set the correct image to the array if its either activated or deactivated
public Integer[] fillImageArray()
{
//Array that will be used to show the reward images
Integer[] Activated ={
R.drawable.rewards1,
R.drawable.rewards2,
R.drawable.rewards3,
R.drawable.rewards4,
R.drawable.rewards5,
R.drawable.rewards6,
};
Integer[] Deactivated ={
R.drawable.rewards1b,
R.drawable.rewards2b,
R.drawable.rewards3b,
R.drawable.rewards4b,
R.drawable.rewards5b,
R.drawable.rewards6b,
};
//for loop that checks to see all the rewards that a particular users has to assign a particular image.
for(int x = 0;x<rewards_num.length;x++)
{
for(int y = 0;y<6;y++)
{
if(rewards_num[x]==y)
{
Images[x]=Activated[y];
}
else
{
Images[x]=Deactivated[y];
}
}
}
return Images;
}
//constructor with the context being passed.
public ImageAdapter(Context m)
{
c = m;
}
public int getCount() {
return 6;
}
public Object getItem(int position) {
return Images[position];
}
public long getItemId(int position) {
return 0;
}
// The function View create a new ImageView for each item that is being referenced by the Adapter
public View getView(int position, View convertView, ViewGroup parent) {
finalImages = fillImageArray();
ImageView imageView = new ImageView(c);
imageView.setImageResource(finalImages[position]);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(300, 300));
return imageView;
}
}