Question

我想使用左右箭头进行导航..

我已经厌倦了使用按钮，但没什么好开心的。 - 我尝试过的是：

@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向右或向左箭头移动到下一个图像..我能够滑动..但是箭头不起作用。

Answer 1

如果你想使用滑动和箭头，那么你必须使用这样的左右听众。

DATEDIFF('second', [begin date], [end date])

Answer 2

试试这个

public static HttpContextBase FakeHttpContext(HttpVerbs verbs, NameValueCollection nameValueCollection)
{
    var httpContext = new Mock<HttpContextBase>();
    var user = new ApplicationUser { 
            Id = "abc", 
            TimezoneId = "America/New_York" 
        };

    var request = new Mock<HttpRequestBase>();
    request.Setup(c => c.Form).Returns(nameValueCollection);
    request.Setup(c => c.QueryString).Returns(nameValueCollection);
    request.Setup(c => c.RequestType).Returns(verbs.ToString().ToUpper());

    var response = new Mock<HttpResponseBase>();
    var session = new Mock<HttpSessionStateBase>();
    var server = new Mock<HttpServerUtilityBase>();
    httpContext.Setup(c => c.Request).Returns(request.Object);

    var u = verbs.ToString().ToUpper();

    httpContext.Setup(c => c.Response).Returns(response.Object);
    httpContext.Setup(c => c.Server).Returns(server.Object);
    httpContext.Setup(c => c.User.Identity.GetUserId()).Returns("abc");
    httpContext.Setup(c => c.User.ApplicationUser()).Returns(user);
    return httpContext.Object;
}

Answer 3

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 4

尝试以下

为左右箭头实现2个按钮。在单击函数调用中：

a）如果点击左箭头 - viewPager.arrowScroll（View.FOCUS_LEFT）;

b）如果点击了右侧箭头 - viewPager.arrowScroll（View.FOCUS_RIGHT）;

在viewPager android中使用箭头导航？我试过了不同的例子，但没有成功

4 个答案: