android - 在 viewPager android 中使用箭头进行导航？我尝试了不同的例子但没有成功

Question

• 我想使用向右和向左箭头进行导航..

• 我已经厌倦了使用按钮，但没有任何反应。-我试过的如下:

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_instruction);
      preferenceHelper = new PreferenceHelper(Instruction.this);
      viewPager = (ViewPager) findViewById(R.id.myviewpager);
      myPagerAdapter = new MyPagerAdapter();
      viewPager.setAdapter(myPagerAdapter);
  
    txtrank = (TextView)findViewById(R.id.rank);
    tvRight=(TextView)findViewById(R.id.tvRight);
    tvLeft=(TextView)findViewById(R.id.tvLeft);
  
  
  
   /* tvRight.setOnClickListener(new View.OnClickListener(){
          @Override
          public void onClick(View v) {
              if(viewPager.getCurrentItem() < viewPager.getRight())
                  viewPager.setCurrentItem(viewPager.getCurrentItem()+1,true);
          }
      });
  
      tvLeft.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              if (viewPager.getCurrentItem() > viewPager.getLeft())
                  viewPager.setCurrentItem(viewPager.getCurrentItem()-1,true);
          }
      });*/
  
   // Generate sample data
  
  rank = new String[] { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
  
       /* sharedPreferences = getSharedPreferences("ShaPreferences",
        Context.MODE_PRIVATE); SharedPreferences.Editor editor =
        sharedPreferences.edit(); boolean firstTime =
        sharedPreferences.getBoolean("first", true); 
  
        if (firstTime) {
        editor.putBoolean("first", false); editor.commit();
        viewPager.setAdapter(myPagerAdapter);
  
        Intent intent = new Intent(Instruction.this, LoginActivity.class);
        startActivity(intent);
  
        } else { Intent intent = new Intent(Instruction.this,
        LoginActivity.class); startActivity(intent); }*/
  
  
  }
  
  private class MyPagerAdapter extends PagerAdapter {
  
      int NumberOfPages = 9;
  
      int[] res = { R.drawable.a0, R.drawable.b1, R.drawable.c2,
              R.drawable.d3, R.drawable.e4, R.drawable.f5, R.drawable.g6,
              R.drawable.h7, R.drawable.i8 };
  
      /*
       * int[] backgroundcolor = { 0xFF101010, 0xFF202020, 0xFF303030,
       * 0xFF404040, 0xFF505050, 0xFF101010, 0xFF202020, 0xFF303030,
       * 0xFF404040, 0xFF303030};
       */
  
      @Override
      public int getCount() {
  
          return NumberOfPages;
  
  
      }
  
      @Override
      public boolean isViewFromObject(View view, Object object) {
          return view == object;
      }
  
      @Override
      public Object instantiateItem(ViewGroup container, int position) {
  
          /*
           * TextView textView = new TextView(Instruction.this);
           * textView.setTextColor(Color.WHITE); textView.setTextSize(20);
           * textView.setTypeface(Typeface.DEFAULT_BOLD);
           * textView.setText(String.valueOf(position));
           */
  
          txtrank.setText(rank[position]);
  
          ImageView imageView = new ImageView(Instruction.this);
          imageView.setImageResource(res[position]);
          LayoutParams imageParams = new LayoutParams(
                  LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
          imageView.setLayoutParams(imageParams);
  
          LinearLayout layout = new LinearLayout(Instruction.this);
          layout.setOrientation(LinearLayout.VERTICAL);
          LayoutParams layoutParams = new LayoutParams(
                  LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
          // layout.setBackgroundColor(backgroundcolor[position]);
          layout.setLayoutParams(layoutParams);
          // layout.addView(textView);
          layout.addView(imageView);
  
          final int page = position;
          /*layout.setOnClickListener(new OnClickListener() {
  
              @Override
              public void onClick(View v) {
  
                   * Toast.makeText(Instruction.this, "Page " + page +
                   * " clicked", Toast.LENGTH_LONG) .show();
  
  
              }
          });*/
          if (viewPager.getCurrentItem() == 7) {
              Intent intent = new Intent(getApplicationContext(),
                      LoginActivity.class);
              startActivity(intent);
          }
          Log.e("at page number", String.valueOf(viewPager.getCurrentItem()));
          container.addView(layout);
          return layout;
      }
  
      @Override
      public void destroyItem(ViewGroup container, int position, Object object) {
          container.removeView((LinearLayout) object);
      }
  
  }
  
   @Override
      public void onClick(View v) {
  
          switch (v.getId())
          { 
              case R.id.left:
                   if(viewPager.getCurrentItem() < viewPager.getLeft())
                          viewPager.setCurrentItem(viewPager.getCurrentItem()-1,true);
  
  
                  break; 
  
              case R.id.right:
                   if(viewPager.getCurrentItem() < viewPager.getRight())
                          viewPager.setCurrentItem(viewPager.getCurrentItem()+1,true);
                  break; 
  
          } 
  

    private int getItem(int i) {
         return viewPager.getCurrentItem() + i;
  }
  

-我想要的是..用户可以通过滑动以及使用右箭头或左箭头移动到下一张图片..我可以滑动..但是箭头不起作用。

Answer 1

如果你想让它与滑动和箭头一起工作，那么你必须像这样使用左右监听器。

    right.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            if(pager.getCurrentItem() < pager.getRight())
            pager.setCurrentItem(pager.getCurrentItem()+1,true);
        }
    });

    left.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (pager.getCurrentItem() > pager.getLeft())
                pager.setCurrentItem(pager.getCurrentItem()-1,true);
        }
    });