[英]SwipeGestureDetector change image from int [] to Imageview (Top & Bottom)
我需要從int數組中獲取圖像,然后在從底部到頂部以及從頂部到底部滑動時在Imageview中顯示。
GestureDetector效果很好,但是我想從int []中獲取圖像,然后在滑動時放入Imageview中。
范例:
int [] imageBank = new int[] {
R.drawable.image0,
R.drawable.image1,
R.drawable.image2,
R.drawable.image3,
R.drawable.image4, };
從上到下滑動,從[]拍攝圖像0,在Imageview中顯示
從上到下滑動,從[]拍攝圖像1,在Imageview中顯示
從下往上滑動,從[]拍攝圖像0,在Imageview中顯示
從下往上滑動,從[]拍攝圖像4,在Imageview中顯示
完成MainActivity
import android.support.constraint.ConstraintLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import driss.moodtracker.R;
import driss.moodtracker.component.SwipeGestureDetector;
public class MainActivity extends AppCompatActivity {
private SwipeGestureDetector gestureDetector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gestureDetector = new SwipeGestureDetector(this);
Button button_comment = (Button) findViewById(R.id.button1);
Button button_calendar = (Button) findViewById(R.id.button2);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
public void onSwipe(SwipeGestureDetector.SwipeDirection direction) {
ImageView imagePic = (ImageView) findViewById(R.id.imageview);
ConstraintLayout currentLayout = (ConstraintLayout) findViewById(R.id.main_layout);
// ARRAY OF SMILEYS LIST
int [] arraySmileys = new int[] {
R.drawable.smiley_super_happy,
R.drawable.smiley_happy,
R.drawable.smiley_normal,
R.drawable.smiley_disappointed,
R.drawable.smiley_sad,
};
// HOW CAN I DO ?
String message = "";
switch (direction) {
case LEFT_TO_RIGHT:
message = "Left to right swipe";
break;
case RIGHT_TO_LEFT:
message = "Right to left swipe";
break;
case TOP_TO_BOTTOM:
imagePic.setImageResource(R.drawable.smiley_disappointed);
currentLayout.setBackgroundResource(R.color.faded_red);
message = "Top to bottom swipe";
break;
case BOTTOM_TO_TOP:
currentLayout.setBackgroundResource(R.color.light_sage);
imagePic.setImageResource(R.drawable.smiley_super_happy);
message = " Bottom to top swipe";
break;
}
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
}
}
謝謝你的幫助
一個新學生。
定義一個“計數器”(整數變量)來存儲整數數組的索引。 現在,基於檢測到的滑動,如果用戶從下向上滑動,則計數器會遞增,並將該索引項的圖像設置為您的imageview,反之亦然,直到底部。
示例代碼:
int counter = 0;
public void swipe() {
switch (direction) {
case LEFT_TO_RIGHT:
message = "Left to right swipe";
break;
case RIGHT_TO_LEFT:
message = "Right to left swipe";
break;
case TOP_TO_BOTTOM:
if(counter > 0) {
counter--;
imagePic.setImageResource(arraySmileys[counter]);
}
break;
case BOTTOM_TO_TOP:
if(counter < arraySmileys.length()) {
counter++;
imagePic.setImageResource(arraySmileys[counter]);
}
break;
}
}
最好將ViewPager
或RecyclerView
與ViewPager
的行為一起使用,而不要使用GestureDetector
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