android 自定义 gallery

package com.cn; import android.app.Activity; import android.graphics.BitmapFactory; import android.graphics.Color; import android.graphics.BitmapFactory.Options; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.View; import android.view.View.OnClickListener; import android.widget.HorizontalScrollView; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.ImageView.ScaleType; import android.widget.LinearLayout.LayoutParams; public class Test2Activity extends Activity implements OnClickListener { private LinearLayout mLayout; private HorizontalScrollView mScrollView; private int width; private int x; private View mPreClickItem; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mScrollView = (HorizontalScrollView) findViewById(R.id.horizontalScrollView1); DisplayMetrics display = getResources().getDisplayMetrics(); width = display.widthPixels; mLayout = (LinearLayout) findViewById(R.id.linearLayout1); for (int i = 0; i < 10; i++) { TextView textView = new TextView(this); textView.setGravity( Gravity.CENTER); textView.setText("顺序:" + i); textView.setOnClickListener(this); LayoutParams params = new LinearLayout.LayoutParams(100, 100); if (i == 0) { params.leftMargin = 10; } params.gravity = Gravity.CENTER; params.rightMargin = 10; mLayout.addView(textView,params); } } @Override public void onClick(View v) { if (mPreClickItem != null) { mPreClickItem.setBackgroundColor(Color.TRANSPARENT); } v.setBackgroundResource(R.drawable.abc); x = v.getLeft() + v.getWidth() / 2 - width / 2; Log.i("tag", " onClick:" + x); mScrollView.smoothScrollTo(x, 0); mPreClickItem = v; } }