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

Question

我想使用左右箭头进行导航..

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

这样试试

Button leftButton = (Button)findViewById(R.id.left);
    leftButton.setOnClickListener(new OnClickListener() {

     @Override
           public void onClick(View view) {
               mViewPager.setCurrentItem(getItem(-1), true);
           }
        });

Button rightButton = (Button)findViewById(R.id.right);
    rightButton.setOnClickListener(new OnClickListener() {

     @Override
           public void onClick(View view) {
               mViewPager.setCurrentItem(getItem(+1), true);
           }
        });



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

Answer 2

试试这个：

 @Override 
public void onClick(View v) {
    int currentItemPosition = adapter.getItemPosition(viewpager.getCurrentItem());
    int itemCount = adapter.getCount();
    switch (v.getId())
    { 
        case R.id.left:
            if(currentItemPosition > 0) {
                viewPager.setCurrentItem(currentItemPosition - 1, true);
            }
            break; 

        case R.id.right:
            if(currentItemPosition < itemCount-1 ) {
                viewPager.setCurrentItem(currentItemPosition + 1, true);
            }
            break; 

    } 
}

Answer 3

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);
        }
    });

Answer 4

尝试以下方法

为左箭头和右箭头实现 2 个按钮。在单击函数调用中：

a) 如果左箭头被点击 - viewPager.arrowScroll(View.FOCUS_LEFT);

b) 如果右箭头被点击 - viewPager.arrowScroll(View.FOCUS_RIGHT);

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

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