android的两种布局------------------------经自身测试,完全正确

android的UI布局有两种方式：

一、通过xml文件来配置（如main.xml）

protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.g2); final TextView tView=(TextView)findViewById(R.id.t1); Button button1=(Button)findViewById(R.id.button9); Button button2=(Button)findViewById(R.id.button10); button2.setOnClickListener(new OnClickListener() { public void onClick(View v) {

tView.setTextColor(Color.GRAY); } }); }

或者定期activity的private变量

protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState);

setContentView(R.layout.g2);

注意：只有在加载指定的layout的后才可以通过该layout实例化 tView=(TextView)findViewById(R.id.t1); button1=(Button)findViewById(R.id.button9); button2=(Button)findViewById(R.id.button10);

setButton1(); setButton2(); }

private TextView tView; private Button button1; private Button button2;

二、通过自定义

private LinearLayout mylayout;

private LinearLayout.LayoutParams layoutP;

private int WC = LinearLayout.LayoutParams.WRAP_CONTENT;

private TextView tv;

private Button button1;

private Button button2;

private Button button3;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

/* 实例化一个LinearLayout布局对象*/

myLayout = new LinearLayout(this);

/* 设置LinearLayout的布局为垂直布局*/

myLayout.setOrientation(LinearLayout.VERTICAL);

/* 设置LinearLayout布局背景图片*/

myLayout.setBackgroundResource(R.drawable.back);

/* 加载主屏布局*/

setContentView(myLayout);

/* 实例化一个LinearLayout布局参数，用来添加View */

layoutP = new LinearLayout.LayoutParams(WC, WC);

tv=new TextView(this);

mylayout.addView(tv, layoutP);

}

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