小编yes*_*4me的帖子

当我启动应用程序时,按钮工作.每次旋转手机时,都会调用onConfigurationChanged.但是按下按钮后不再调用onClick.我该如何解决这个问题？提前致谢.

PS:实际的程序是一个有很多按钮的计算器.

package com.thomas.test.app;

import android.app.Activity;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends Activity implements View.OnClickListener
{
    Button button1;

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        if (newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE)
            setContentView(R.layout.activity_main_h);
        else if (newConfig.orientation==Configuration.ORIENTATION_PORTRAIT)
            setContentView(R.layout.activity_main_v);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_v);

        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        Log.d("XYZ", "onClick: IN");
        if (view.getId()==R.id.button1)
            button1.setText("PRESSED");
    }
}

这是activity_main_h.xml(activity_main_v除了显示"vertical"之外是相同的):

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.thomas.test.app.MainActivity">

    <TextView
        android:text="horizontal"
        android:layout_width="wrap_content" …

此代码无法在最后一行运行.我不知道为什么.

var Vehicle = function() {
	var age = 21;			//private variable
	this.setAge = function(age2) {age = age2;};
	this.getAge = function() {return age;};
};

var Plane = function() {};
Plane.prototype = Object.create(Vehicle.prototype);

var plane = new Plane();
console.log( plane instanceof Vehicle );
//console.log( plane.getAge() );	//TypeError: plane.getAge is not a function

getString和String.valueOf有什么区别？

在我的例子中,我在strings.xml中声明了"bgDefault": <string name="bgDefault">#0C090A</string>

我可以打印出这个值Log.d("xyz", R.color.bgDefault);也有效:getString(R.color.bgDefault)但为什么不起作用String.valueOf(R.color.bgDefault)呢？