通过使用扩展视图类的setContentView [英] setContentView by using extending view class

问题描述

我使用的扩展视图设置一个activity..what的内容正在发生的事情是显示设置文本的空白activity.instead。

 公共类ThreadCheck延伸活动{
        MyView的观点;
        / *（非Javadoc中）
         * @see android.app.Activity＃的onCreate（android.os.Bundle）
         * /
        @覆盖
        保护无效的onCreate（捆绑savedInstanceState）{
            // TODO自动生成方法存根
            super.onCreate（savedInstanceState）;
            上下文CTX = getApplicationContext（）;
            鉴于=新MyView的（CTX）;
            的setContentView（视图）;
        }
    }
 

---

 公共类MyView的扩展视图{
            TextView的tvThread;
            公共MyView的（上下文的背景下）{
                超级（上下文）;
                tvThread =新的TextView（背景）;
                tvThread.setText（你好，这是MyView的）;
                // TODO自动生成构造函数存根
            }        }
 

解决方案

更改此

 查看=新的MyView的（CTX）;
 

到

 查看=新的MyView的（ThreadCheck.this）;
 

和变更

 公共类MyView的扩展TextView的{    公共MyView的（上下文的背景下）{
        超级（上下文）;
        this.setText（你好，这是MyView的）;
    }}
 

编辑：在评论的问题。你需要一个ViewGroup中向其中添加你的看法。

 公共类MyView的扩展RelativeLayout的{        公共MyView的（上下文的背景下）{
            超级（上下文）;
            RelativeLayout.LayoutParams的LayoutParams =新RelativeLayout.LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;
            this.setLayoutParams（的LayoutParams）;            RelativeLayout.LayoutParams params1 =新RelativeLayout.LayoutParams（LayoutParams.WRAP_CONTENT，LayoutParams.WRAP_CONTENT）;            TextView的电视=新的TextView（背景）;
            tv.setText（你好）;
            tv.setId（1）;            按钮B =新按钮（背景）;
            params1.addRule（RelativeLayout.BELOW，tv.getId（））;
            b.setText（你好）;
            b.setId（2）;            this.addView（电视）;
            this.addView（B，params1）;        }
    }
 

I am using extends View for setting content of an activity..what is happening it is showing blank activity.instead of setting text.

public class ThreadCheck extends Activity{
        MyView view;
        /* (non-Javadoc)
         * @see android.app.Activity#onCreate(android.os.Bundle)
         */
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            Context ctx = getApplicationContext();
            view=new MyView(ctx);
            setContentView(view);
        }
    }

---

public class MyView extends View{
            TextView tvThread;
            public MyView(Context context) {
                super(context);
                tvThread=new TextView(context);
                tvThread.setText("Hello This Is Myview");
                // TODO Auto-generated constructor stub
            }

        }

解决方案

Change this

view=new MyView(ctx);

to

view=new MyView(ThreadCheck.this);

And change to

   public class MyView extends TextView{

    public MyView(Context context) {
        super(context);
        this.setText("Hello This Is Myview");
    }

}

Edit: to the question in comment. You need a ViewGroup to which you add your views.

public class MyView extends RelativeLayout{

        public MyView(Context context) {
            super(context);


            RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            this.setLayoutParams(layoutParams);

            RelativeLayout.LayoutParams params1 = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

            TextView tv = new TextView(context);
            tv.setText("hello");
            tv.setId(1);

            Button b = new Button(context);
            params1.addRule(RelativeLayout.BELOW, tv.getId());
            b.setText("Hi");
            b.setId(2);

            this.addView(tv);
            this.addView(b, params1);

        }
    }

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