说到Log1那么crashes.Whats错了？

Question

"is"是Imageswitcher的ID

s 是数组中的图像编号

数组包含 5 images:play 停止下一个上一个暂停

public class MainActivity extends AppCompatActivity {

Button btnnext,btnprev;
ImageSwitcher is;
int s;


 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   final Integer[] img=new Integer[]{R.drawable.next,R.drawable.play,R.drawable.previous,R.drawable.stop,R.drawable.pause,};
    btnnext=(Button)findViewById(R.id.btnnext);
    btnprev=(Button)findViewById(R.id.btnprev);
    is     =(ImageSwitcher) findViewById(R.id.is);
    Log.i("log1","1");

    is.setFactory(new ViewSwitcher.ViewFactory() {
        @Override
        public View makeView() {
            ImageView imageView=new ImageView(getApplicationContext());
            imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);

下面这行有什么问题吗？

            imageView.setLayoutParams(new ImageSwitcher.LayoutParams
                    (LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
          is.setImageResource(img[s]);

Log.i("log","4"); return imageView;

        }
    });

Log.i("log2", "2");

按钮下一个代码：

        btnnext.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Animation right= AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.slide_out_right);
            Animation left= AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.slide_in_left);
            is.setAnimation(left);
            is.setAnimation(right);
            is.setImageResource(img[(s+1)]);
        }
    });

Log.i("log3", "3");

按钮以前的代码：

        btnprev.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Animation right= AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.slide_out_right);
            Animation left= AnimationUtils.loadAnimation(MainActivity.this,android.R.anim.slide_in_left);
            is.setAnimation(left);
            is.setAnimation(right);
            is.setImageResource(img[(s-1)]);
}
});
}
}

Answer 1

应删除此代码：

   is.setImageResource(img[s]);

而不是：

   is.setImageResource(img[(s+1)]);

我应该使用：

   currentImage++;
            currentImage = currentImage % img.length;
            is.setImageResource(img[currentImage]);

而不是：

    is.setImageResource(img[(s-1)]);

我应该使用：

    currentImage--;
             currentImage = (currentImage + img.length) % img.length;
            is.setImageResource(img[currentImage]);

说到Log1那么crashes.Whats错了？

It comes to Log1 then crashes.Whats wrong?

imageswitcher