我正在尝试在 Android 应用程序中锁定 textField 和 ScrollView。我试图在运行时这样做,但我错过了一些东西。我首先添加到 LinearLayout 的任何对象都是唯一显示的对象。我错过了什么?我没有通过 xml 布局文件定义任何东西。
我的主要活动是:
包 com.example.scrolltest;
导入 com.example.scrolltest.Draw;导入android.widget.ScrollView;导入 android.widget.LinearLayout;导入 android.widget.TextView;导入android.os.Bundle;导入android.app.Activity;导入android.graphics.Color;
公共类 MainActivity 扩展 Activity { 绘制绘制;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
protected void onResume(){
super.onResume();
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.HORIZONTAL);
int lHeight = LinearLayout.LayoutParams.MATCH_PARENT;
int lWidth = LinearLayout.LayoutParams.MATCH_PARENT;
TextView tv = new TextView(this);
tv.setText("Test text. Boom.");
draw = new Draw(this);
draw.setBackgroundColor(Color.WHITE);
ScrollView scrollView = new ScrollView(this);
scrollView.addView(draw);
// add the views to the layout
ll.addView(scrollView, new LinearLayout.LayoutParams(lHeight, lWidth));
ll.addView(tv, new LinearLayout.LayoutParams(lHeight, lWidth));
setContentView(ll);
}
}
只是为了笑,因为 ScrollView 的内容是动态的,并且可以随时更改,我将展示我的 Draw 对象的静态示例:
包 com.example.scrolltest;
导入android.content.Context;导入android.graphics.Canvas;导入android.graphics.Color;导入android.graphics.Paint;导入android.view.View;
公共类绘制扩展视图{油漆油漆=新油漆();
public Draw(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Compute the height required to render the view
// Assume Width will always be MATCH_PARENT.
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = 4000 + 50; // Since 3000 is bottom of last Rect to be drawn added and 50 for padding.
setMeasuredDimension(width, height);
}
@Override
public void onDraw(Canvas canvas) {
paint.setColor(Color.BLUE);
canvas.drawLine(100, 20, 100, 1900, paint);
paint.setColor(Color.BLACK);
canvas.drawText("00:00", 10, 10, paint);
int y = 0;
int x = 200;
for(int i = 100; i < 2900; i=i+10){
paint.setColor(Color.GREEN);
canvas.drawRect(x, i, x+50, i+10, paint);
if(y == 0){
y = 1;
x = 200;
} else
{
y = 0;
x = 30;
}
}
}
}