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上传时间: 2012-10-24
详细说明： package com.android521.activity; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup.LayoutParams; import android.view.animation.TranslateAnimation; import android.widget.ImageView; import android.widget.RelativeLayout; public class MainActivity extends Activity { private RelativeLayout layout; private RelativeLayout layout1; private RelativeLayout layout2; private RelativeLayout layout3; private ImageView tab1; priv ate ImageView tab2; private ImageView tab3; private ImageView first; private int current = 1; // 默认选中第一个，可以动态的改变此参数值 public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initUI(); } private void initUI(){ layout = (RelativeLayout) findViewById(R.id.root); layout1 = (RelativeLayout) findViewById(R.id.layout1); layout2 = (RelativeLayout) findViewById(R.id.layout2); layout3 = (RelativeLayout) findViewById(R.id.layout3); tab1 = (ImageView) findViewById(R.id.tab1); tab1.setOnClickListener(onClickListener); tab2 = (ImageView) findViewById(R.id.tab2); tab2.setOnClickListener(onClickListener); tab3 = (ImageView) findViewById(R.id.tab3); tab3.setOnClickListener(onClickListener); RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); rl.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE); first = new ImageView(this); first.setTag("first"); first.setImageResource(R.drawable.topbar_select); // 默认选中项 switch (current) { case 1: layout1.addView(first, rl); current = R.id.tab1; break; case 2: layout2.addView(first, rl); current = R.id.tab2; break; case 3: layout3.addView(first, rl); current = R.id.tab3; break; default: break; } } private boolean isAdd = false; // 是否添加过 top_select private int select_width; // top_select_width private int select_height; // top_select_height private int firstLeft; // 第一次添加后的左边距***** private int startLeft; // 起始左边距 // 添加一个view，移除一个view private void replace() { switch (current) { case R.id.tab1: changeTop(layout1); break; case R.id.tab2: changeTop(layout2); break; case R.id.tab3: changeTop(layout3); break; default: break; } } private void changeTop(RelativeLayout relativeLayout){ ImageView old = (ImageView) relativeLayout.findViewWithTag("first");; select_width = old.getWidth(); select_height = old.getHeight(); RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(select_width, select_height); rl.leftMargin = old.getLeft() + ((RelativeLayout)old.getParent()).getLeft(); rl.topMargin = old.getTop() + ((RelativeLayout)old.getParent()).getTop(); // 获取起始位置 firstLeft = old.getLeft() + ((RelativeLayout)old.getParent()).getLeft(); ImageView iv = new ImageView(this); iv.setTag("move"); iv.setImageResource(R.drawable.topbar_select); layout.addView(iv , rl); relativeLayout.removeView(old); } private OnClickListener onClickListener = new OnClickListener(){ public void onClick(View v) { if(!isAdd){ replace(); // 初次使用移除old 添加新的top_select为RelativeLayout所使用 isAdd = true; } ImageView top_select = (ImageView) layout.findViewWithTag("move"); int tabLeft; int endLeft = 0; boolean run = false; switch (v.getId()) { case R.id.tab1: if (current != R.id.tab1) { // 中心位置 tabLeft = ((RelativeLayout) tab1.getParent()).getLeft() + tab1.getLeft() + tab1.getWidth() / 2; // 最终位置 endLeft = tabLeft - select_width / 2; current = R.id.tab1; run = true; } break; case R.id.tab2: if (current != R.id.tab2) { tabLeft = ((RelativeLayout) tab2.getParent()).getLeft() + tab2.getLeft() + tab2.getWidth() / 2; endLeft = tabLeft - select_width / 2; current = R.id.tab2; run = true; } break; case R.id.tab3: if (current != R.id.tab3) { tabLeft = ((RelativeLayout) tab3.getParent()).getLeft() + tab3.getLeft() + tab3.getWidth() / 2; endLeft = tabLeft - select_width/2; current = R.id.tab3; run = true; } break; default: break; } if(run){ TranslateAnimation animation = new TranslateAnimation(startLeft, endLeft - firstLeft, 0, 0); startLeft = endLeft - firstLeft; // 重新设定起始位置 animation.setDuration(400); animation.setFillAfter(true); top_select.bringToFront(); top_select.startAnimation(animation); } } }; } ...展开收缩
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