Android界面滑动，导航栏同步滑动

package com.fcy.start1; import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.graphics.Color; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.view.View.OnClickListener; import android.view.WindowManager; import android.view.animation.TranslateAnimation; import android.widget.Button; import android.widget.LinearLayout.LayoutParams; import com.ys.start1.R; public class MainActivity extends Activity implements OnClickListener{ //View集合 private ArrayList<View> viewPagerViews = new ArrayList<View>(); //滑动View控件 private ViewPager viewPager; //四个界面 private View black; private View blue; private View green; private View red; //对应四个界面 private final int BLACK = 0; private final int BLUE = 1; private final int GREEN = 2; private final int RED = 3; //当前停留的位置 private int currentId = BLACK; //底部滑动线条 private View buttomView; //当前屏幕宽度 private int ActivityWidth; @Override public void onCreate(Bundle savedInstanceState) { WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE); ActivityWidth = wm.getDefaultDisplay().getWidth(); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); viewPager = (ViewPager)findViewById(R.id.vPager); black = new View(this); black.setBackgroundColor(Color.BLACK); viewPagerViews.add(black); blue= new View(this); blue.setBackgroundColor(Color.BLUE); viewPagerViews.add(blue); green= new View(this); green.setBackgroundColor(Color.GREEN); viewPagerViews.add(green); red= new View(this); red.setBackgroundColor(Color.RED); viewPagerViews.add(red); MyPagerAdapter adapter = new MyPagerAdapter(viewPagerViews); viewPager.setAdapter(adapter); viewPager.setCurrentItem(BLACK); initButtomView(); initTopBtn(); viewPager.setOnPageChangeListener(new OnPageChangeListener() { public void onPageSelected(int position) { slideView(position); currentId = position; } public void onPageScrolled(int arg0, float arg1, int arg2) {} public void onPageScrollStateChanged(int arg0) {} }); } //底部滑动， positionId， 你要滑动到的位置 private void slideView(int positionId){ TranslateAnimation tran = null; tran = new TranslateAnimation(calcPosition(currentId),calcPosition(positionId),0,0); tran.setDuration(300); tran.setFillAfter(true); buttomView.startAnimation(tran); } //初始化底部滑动线条 private void initButtomView() { //初始化宽高 buttomView = (View)findViewById(R.id.v_buttom); LayoutParams params = new LayoutParams(ActivityWidth / 4,5); buttomView.setLayoutParams(params); //初始化颜色 buttomView.setBackgroundColor(Color.WHITE); } private void initTopBtn(){ Button black = (Button)findViewById(R.id.btn_1); Button blue = (Button)findViewById(R.id.btn_2); Button green = (Button)findViewById(R.id.btn_3); Button red = (Button)findViewById(R.id.btn_4); LayoutParams params2 = new LayoutParams(ActivityWidth / 4,LayoutParams.WRAP_CONTENT); black.setLayoutParams(params2); black.setTag(BLACK); black.setOnClickListener(this); blue.setLayoutParams(params2); blue.setTag(BLUE); blue.setOnClickListener(this); green.setLayoutParams(params2); green.setTag(GREEN); green.setOnClickListener(this); red.setLayoutParams(params2); red.setTag(RED); red.setOnClickListener(this); } //计算位置 position 需要移动到的位置 private int calcPosition(int positionId){ int position = ActivityWidth/4; int currentPosition = 0; for (int i = 0; i < positionId; i++) { currentPosition += position; } return currentPosition; } @Override public void onClick(View v) { int position = Integer.parseInt(v.getTag().toString()); slideView(position); viewPager.setCurrentItem(position); currentId = position; } }