這個是網易新聞的主界面，我們知道底部可以用tabhost實現，這個很容易，我們在其他軟件中也會經常用到。
至於頂部的滑動條，個人感覺還是比較漂亮的所以今天也模仿了下，網易頂部滑動條的效果，由於初次模仿這種效果，可能有些地方還不夠完美，不過基本已經實現，希望大家能夠喜歡。
廢話不多說，下面上代碼：
首先是佈局layout下的main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/root"
android:background="#ffffff"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:id="@+id/layoutBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/big_button_up"
android:orientation="horizontal" >
<RelativeLayout
android:id="@+id/layout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1.0" >
<TextView
android:id="@+id/tab1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="新聞" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/layout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1.0" >
<TextView
android:id="@+id/tab2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="體育" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/layout3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1.0" >
<TextView
android:id="@+id/tab3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="娛樂" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/layout4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="1.0" >
<TextView
android:id="@+id/tab4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="更多" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/page"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_below="@+id/layoutBar"
android:background="#ffffff"
android:orientation="vertical"
>
</LinearLayout>
</RelativeLayout>下面是核心類，
package cn.com.karl.slider;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.TranslateAnimation;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class SliderBarActivity extends Activity {
/** Called when the activity is first created. */
private RelativeLayout layout;
private RelativeLayout layout1;
private RelativeLayout layout2;
private RelativeLayout layout3;
private RelativeLayout layout4;
private TextView tab1;
private TextView tab2;
private TextView tab3;
private TextView tab4;
private TextView first;
private int current = 1;
private LinearLayout page;
private boolean isAdd = false;
private int select_width;
private int select_height;
private int firstLeft;
private int startLeft;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
}
private void init(){
layout = (RelativeLayout) findViewById(R.id.root);
layout1 = (RelativeLayout) findViewById(R.id.layout1);
layout2 = (RelativeLayout) findViewById(R.id.layout2);
layout3 = (RelativeLayout) findViewById(R.id.layout3);
layout4 = (RelativeLayout) findViewById(R.id.layout4);
page=(LinearLayout) this.findViewById(R.id.page);
tab1 = (TextView) findViewById(R.id.tab1);
tab1.setOnClickListener(onClickListener);
tab2 = (TextView) findViewById(R.id.tab2);
tab2.setOnClickListener(onClickListener);
tab3 = (TextView) findViewById(R.id.tab3);
tab3.setOnClickListener(onClickListener);
tab4 = (TextView) findViewById(R.id.tab4);
tab4.setOnClickListener(onClickListener);
RelativeLayout.LayoutParams rl = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
rl.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
first = new TextView(this);
first.setTag("first");
first.setGravity(Gravity.CENTER);
first.setBackgroundResource(R.drawable.slidebar);
first.setText(tab1.getText());
View view1=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page1, null);
page.addView(view1);
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;
case 4:
layout4.addView(first, rl);
current = R.id.tab4;
break;
default:
break;
}
}
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;
case R.id.tab4:
changeTop(layout4);
break;
default:
break;
}
}
private void changeTop(RelativeLayout relativeLayout){
TextView old = (TextView) 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();
firstLeft = old.getLeft() + ((RelativeLayout)old.getParent()).getLeft();
TextView tv = new TextView(this);
tv.setTag("move");
tv.setBackgroundResource(R.drawable.slidebar);
layout.addView(tv , rl);
relativeLayout.removeView(old);
}
private OnClickListener onClickListener = new OnClickListener(){
public void onClick(View v) {
if(!isAdd){
replace();
isAdd = true;
}
TextView top_select = (TextView) layout.findViewWithTag("move");
top_select.setGravity(Gravity.CENTER);
top_select.setText(tab1.getText());
int tabLeft;
int endLeft = 0;
boolean run = false;
switch (v.getId()) {
case R.id.tab1:
if (current != R.id.tab1) {
page.removeAllViews();
tabLeft = ((RelativeLayout) tab1.getParent()).getLeft() + tab1.getLeft() + tab1.getWidth() / 2;
endLeft = tabLeft - select_width / 2;
current = R.id.tab1;
top_select.setText(tab1.getText());
run = true;
View view1=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page1, null);
page.addView(view1);
}
break;
case R.id.tab2:
if (current != R.id.tab2) {
page.removeAllViews();
tabLeft = ((RelativeLayout) tab2.getParent()).getLeft() + tab2.getLeft() + tab2.getWidth() / 2;
endLeft = tabLeft - select_width / 2;
current = R.id.tab2;
top_select.setText(tab2.getText());
run = true;
View view2=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page2, null);
page.addView(view2);
}
break;
case R.id.tab3:
if (current != R.id.tab3) {
page.removeAllViews();
tabLeft = ((RelativeLayout) tab3.getParent()).getLeft() + tab3.getLeft() + tab3.getWidth() / 2;
endLeft = tabLeft - select_width/2;
current = R.id.tab3;
top_select.setText(tab3.getText());
run = true;
View view3=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page3, null);
page.addView(view3);
}
break;
case R.id.tab4:
if (current != R.id.tab4) {
page.removeAllViews();
tabLeft = ((RelativeLayout) tab4.getParent()).getLeft() + tab3.getLeft() + tab4.getWidth() / 2;
endLeft = tabLeft - select_width/2;
current = R.id.tab4;
top_select.setText(tab4.getText());
run = true;
View view4=LayoutInflater.from(getApplicationContext()).inflate(R.layout.page4, null);
page.addView(view4);
}
break;
default:
break;
}
if(run){
TranslateAnimation animation = new TranslateAnimation(startLeft, endLeft - firstLeft, 0, 0);
startLeft = endLeft - firstLeft;
animation.setDuration(100);
animation.setFillAfter(true);
top_select.bringToFront();
top_select.startAnimation(animation);
}
}
};
}由於時間比較緊，我沒有做註釋，有時間再做註釋啊。
看一下效果是不是一樣啊！
效果還請大家自行體驗並改進，由於時間倉促，代碼並未做註釋，希望大家能夠原諒，下面我附上源碼下載地址：點擊打開鏈接
