[英]How to move an image to touch location?
我正在嘗試制作一個開始屏幕,用戶可以在其中移動字符(圖像)。
我寫了一些我認為是正確的代碼,但是當我運行該應用程序時,它似乎沒有任何作用。
public class MainActivity extends AppCompatActivity {
private ImageView image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView image = (ImageView) findViewById(R.id.imageView);
image.setOnTouchListener(touchListener);
}
View.OnTouchListener touchListener = new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
if(action == MotionEvent.ACTION_DOWN){
image.setX(event.getX());
image.setY(event.getY());
return true;
}
return false;
}
};
當我運行該應用程序時,觸摸或完全不移動圖像。
代替圖像視圖,將觸摸偵聽器添加到布局示例:activity_main.xml
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/constrainLayout"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher_background"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
constrainLayout.setOnTouchListener(touchListener)
}
var touchListener: OnTouchListener = OnTouchListener { v, event ->
val action = event.action
imageView.x = event.x
imageView.y = event.y
false
}
}
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