Android GridView中GridAdapter 用法詳解

說到Android GridView Listview一定會提到他的adapter，現整理如下：

main.xml布局裡面：

1. <GridView
2. android:id="@+id/grid"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:columnWidth="70dp"
6. android:numColumns="auto_fit"
7. android:verticalSpacing="10dp"
8. android:horizontalSpacing="10dp"
9. android:stretchMode="columnWidth"
10. android:gravity="center"
11. />

gridview_item.xml：

1. <?xml version="1.0" encoding="utf-8"?>
2. <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_height="wrap_content"
4. android:layout_width="wrap_content"
5. android:orientation="vertical"
6. android:gravity="center"
7. android:layout_gravity="center"
8. >
9. <LinearLayout
10. android:layout_height="wrap_content"
11. android:layout_width="wrap_content"
12. android:orientation="vertical"
13. android:gravity="center"
14. android:layout_gravity="center">
15. <ImageView
16. android:id="@+id/grid_icon"
17. android:layout_height="80dip"
18. android:layout_width="80dip"
19. android:gravity="center"
20. android:layout_gravity="center"
21. >
22. </ImageView>
23. <TextView
24. android:id="@+id/grid_name"
25. android:layout_width="wrap_content"
26. android:layout_height="wrap_content"
27. android:singleLine="true"
28. android:gravity="center"
29. android:layout_gravity="center"
30. android:textSize="13px"
31. android:layout_marginTop="4dip"
32. >
33. </TextView>
34. </LinearLayout>
35. </FrameLayout>

java 代碼：

1. GridView grid = (GridView) findViewById(R.id.grid);
2. grid.setAdapter(new GridAdapter(this, mNameList, mDrawableList));

GridAdapter.java類：

1. package com.android.test;
3. import java.util.ArrayList;
5. import android.content.Context;
6. import android.graphics.drawable.Drawable;
7. import android.view.Gravity;
8. import android.view.LayoutInflater;
9. import android.view.View;
10. import android.view.ViewGroup;
11. import android.widget.BaseAdapter;
12. import android.widget.ImageView;
13. import android.widget.LinearLayout;
14. import android.widget.TextView;
16. public class GridAdapter extends BaseAdapter {
17. private ArrayList<String> mNameList = new ArrayList<String>();
18. private ArrayList<Drawable> mDrawableList = new ArrayList<Drawable>();
19. private LayoutInflater mInflater;
20. private Context mContext;
21. LinearLayout.LayoutParams params;
23. public GridAdapter(Context context, ArrayList<String> nameList, ArrayList<Drawable> drawableList) {
24. mNameList = nameList;
25. mDrawableList = drawableList;
26. mContext = context;
27. mInflater = LayoutInflater.from(context);
29. params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
30. params.gravity = Gravity.CENTER;
31. }
33. public int getCount() {
34. return mNameList.size();
35. }
37. public Object getItem(int position) {
38. return mNameList.get(position);
39. }
41. public long getItemId(int position) {
42. return position;
43. }
45. public View getView(int position, View convertView, ViewGroup parent) {
46. ItemViewTag viewTag;
48. if (convertView == null)
49. {
50. convertView = mInflater.inflate(R.layout.gridview_item, null);
52. // construct an item tag
53. viewTag = new ItemViewTag((ImageView) convertView.findViewById(R.id.grid_icon), (TextView) convertView.findViewById(R.id.grid_name));
54. convertView.setTag(viewTag);
55. } else
56. {
57. viewTag = (ItemViewTag) convertView.getTag();
58. }
60. // set name
61. viewTag.mName.setText(mNameList.get(position));
63. // set icon
64. viewTag.mIcon.setBackgroundDrawable(mDrawableList.get(position));
65. viewTag.mIcon.setLayoutParams(params);
66. return convertView;
67. }
69. class ItemViewTag
70. {
71. protected ImageView mIcon;
72. protected TextView mName;
74. /**
75. * The constructor to construct a navigation view tag
76. *
77. * @param name
78. * the name view of the item
79. * @param size
80. * the size view of the item
81. * @param icon
82. * the icon view of the item
83. */
84. public ItemViewTag(ImageView icon, TextView name)
85. {
86. this.mName = name;
87. this.mIcon = icon;
88. }
89. }
91. }

到此，adapter的使用就算結束，效果圖如下：

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