我是Android開發的新手，并且一直遵循Android網站上提供的教程。我目前在視圖教程部分，特別是Grid Views：

Hello, Grid View Tutorial的教程。

我無法通過適配器了解視圖的形式。我明白您必須覆蓋適配器類中的getView()方法，并且在此方法中定義您的視圖的設置方式。我不明白的是getView()實際上是在哪里調用的？也許我在這里有錯誤的心態，但在下面的代碼(Grid View教程)中，我沒有看到任何調用getView()(或適配器類中使用的任何其他東西，如getCount()) 。

main.xml中

android:id="@+id/gridview"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:columnWidth="90dp"

android:numColumns="auto_fit"

android:verticalSpacing="10dp"

android:horizontalSpacing="10dp"

android:stretchMode="columnWidth"

android:gravity="center" />

Start.java

package com.examples.hellogridlayout;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.GridView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

public class Start extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

GridView gridview = (GridView)findViewById(R.id.gridview);

gridview.setAdapter(new ImageAdapter(this));

gridview.setOnItemClickListener(new OnItemClickListener(){

public void onItemClick(AdapterView> parent,View v, int position, long id){

Toast.makeText(Start.this, "" + position,Toast.LENGTH_SHORT).show();

}

});

}

}

ImageAdapter.java

package com.examples.hellogridlayout;

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 ImageAdapter extends BaseAdapter {

private Context mContext;

public ImageAdapter(Context c) {

mContext = c;

}

public int getCount() {

return mThumbIds.length;

}

public Object getItem(int position) {

return null;

}

public long getItemId(int position) {

return 0;

}

// create a new ImageView for each item referenced by the Adapter

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

ImageView imageView;

if (convertView == null) { // if it's not recycled, initialize some attributes

imageView = new ImageView(mContext);

imageView.setLayoutParams(new GridView.LayoutParams(85, 85));

imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);

imageView.setPadding(8, 8, 8, 8);

} else {

imageView = (ImageView) convertView;

}

imageView.setImageResource(mThumbIds[position]);

return imageView;

}

// references to our images

private Integer[] mThumbIds = {

R.drawable.sample_2, R.drawable.sample_3,

R.drawable.sample_4, R.drawable.sample_5,

R.drawable.sample_6, R.drawable.sample_7,

R.drawable.sample_0, R.drawable.sample_1,

R.drawable.sample_2, R.drawable.sample_3,

R.drawable.sample_4, R.drawable.sample_5,

R.drawable.sample_6, R.drawable.sample_7,

R.drawable.sample_0, R.drawable.sample_1,

R.drawable.sample_2, R.drawable.sample_3,

R.drawable.sample_4, R.drawable.sample_5,

R.drawable.sample_6, R.drawable.sample_7

};

}

總結

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