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我是Android新手，我正在嘗試縮放縮放代碼。在此行出現「LinearLayout無法解析爲類型」錯誤。 mainView =（LinearLayout）findViewById（R.id.linearLayout）; 下面的代碼可以幫助我解決這個問題。感謝您的幫助。我收到錯誤「LinearLayout無法解析爲某種類型」也有說明「多行標記在此行」
package com.zoomlayout;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.PointF;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ZoomLayout extends Activity {
View mainView = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zoom_layout);
mainView =(LinearLayout)findViewById(R.id.linearLayout); //got the error here
Button buttonZoomOut = (Button)findViewById(R.id.buttonZoomOut);
Button buttonNormal = (Button)findViewById(R.id.buttonNormal);
Button buttonZoomIn = (Button)findViewById(R.id.buttonZoomIn);
buttonZoomOut.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
zoom(0.5f,0.5f,new PointF(0,0));
}
});
buttonNormal.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
zoom(1f,1f,new PointF(0,0));
}
});
buttonZoomIn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
zoom(2f,2f,new PointF(0,0));
}
});
}
/** zooming is done from here */
public void zoom(Float scaleX,Float scaleY,PointF pivot){
mainView.setPivotX(pivot.x);
mainView.setPivotY(pivot.y);
mainView.setScaleX(scaleX);
mainView.setScaleY(scaleY);
}
}