橫向滑動菜單的使用
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.wzq.scrollviewindicater.fragment.MFragment;
import java.util.ArrayList;
public class MainActivity extends FragmentActivity implements View.OnClickListener{
private LinearLayout ll_head;
private ViewPager viewPager;
private String[] titles;
private HorizontalScrollView hsv;
private ArrayList<TextView> titlesView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ll_head = (LinearLayout) findViewById(R.id.ll_header);
hsv = (HorizontalScrollView) findViewById(R.id.hsv);
viewPager = (ViewPager) findViewById(R.id.viewpager);
titles = new String[]{"頭條", "娛樂", "科技", "信息", "八卦", "北京", "上海", "天津",
"重慶", "大大燕網"};
//動態添加頂部textview
initTitles();
viewPager.setAdapter(new MPagerAdapter(getSupportFragmentManager()));
setOnClickListener();
}
/**
* 動態生成標題
*/
private void initTitles() {
titlesView = new ArrayList<>();//裝標題控件的集合
for (int i = 0; i < titles.length; i++) {
TextView textView = new TextView(MainActivity.this);
textView.setTextSize(35);
if (i == 0) {
textView.setTextColor(Color.RED);
}
textView.setText(titles[i]);
textView.setId(i);//把循環的i設置給textview的下標;
textView.setOnClickListener(this);
//LinearLayout中的孩子的定位參數
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
layoutParams.setMargins(10,10,10,10);//設置左上右下四個margin值;
//layoutParams是讓linearLayout知道如何擺放自己孩子的位置的;
ll_head.addView(textView,layoutParams);
titlesView.add(textView);
}
}
/*
* 設置頂部標題點擊事件;
*/
private void setOnClickListener() {
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onPageSelected(int position) {
// 標題變色,用循環改變標題顏色,通過判斷來決定誰紅誰灰;
// 舉例:娛樂的下標是position是1
for (int i = 0; i < titles.length; i++) {
if(i == position){
titlesView.get(i).setTextColor(Color.RED);
}else {
titlesView.get(i).setTextColor(Color.GRAY);
}
}
// 標題滑動功能
int width = titlesView.get(position).getWidth();
int totalWidth = (width +20)*position;
hsv.scrollTo(totalWidth,0);
}
});
}
/**
* 讓activity實現點擊事件接口
* 點擊文字的時候回出發這個點擊事件;
* @param view
*/
@Override
public void onClick(View view) {
int position = view.getId();//就是下標
viewPager.setCurrentItem(position);
}
/**
* 底部viewpager要使用的FragmentUI適配器
*/
private class MPagerAdapter extends FragmentPagerAdapter {
public MPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return MFragment.getInstance(titles[position]);
}
@Override
public int getCount() {
return titles.length;
}
}
}
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