android 界面效果大全

GridView是Android中的數據顯示控件,先體驗一下它的效果android

這是GridView只呈現圖片的效果。源碼下載佈局

下面詳細介紹一下GridView。this

1、簡介spa

    在二維可滾動網格中呈現子項(Item),Item來自於與之相關的ListAdapter.xml

2、重要方法blog

  getStretchMode():獲取GridView的延伸模式。圖片

  onKeyDown(int keyCode, KeyEvent event):默認KeyEvent.Callback.onKeyMultiple()ip

3、具體應用ci

1.在佈局文件中說明get

<GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/grid"
 android:layout_width="match_parent" 
 android:layout_height="match_parent"
    android:padding="10dp"
    android:verticalSpacing="10dp"
    
    android:horizontalSpacing="10dp"
    android:numColumns="auto_fit"
    android:columnWidth="60dp"
    android:stretchMode="columnWidth"
    
    android:gravity="center"
    />

 

2.程序使用

private GridView mGrid;

mGrid = (GridView) findViewById(R.id.grid);

 

3.定義適配器

public class AppsAdapter extends BaseAdapter {
  public AppsAdapter() {
  }

  public View getView(int position, View convertView, ViewGroup parent) {
   ImageView i;

   if (convertView == null) {
    i = new ImageView(GridDemo.this);
    i.setScaleType(ImageView.ScaleType.FIT_CENTER);
    i.setLayoutParams(new GridView.LayoutParams(50, 50));
   } else {
    i = (ImageView) convertView;
   }

   ResolveInfo info = mApps.get(position);
   i.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));

   return i;
  }

  public final int getCount() {
   return mApps.size();
  }

  public final Object getItem(int position) {
   return mApps.get(position);
  }

  public final long getItemId(int position) {
   return position;
  }
 }

 

4.應用適配器

mGrid.setAdapter(new AppsAdapter());

 

5.獲取圖片

 private void loadApps() {
  Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
  mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

  mApps = getPackageManager().queryIntentActivities(mainIntent, 0);  }

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