android常用布局的代码实现所有的布局都会对应相关的类,这些类都是继承自 android.view.ViewGroup 类的。而 LinearLayout,RelativeLayout 都是在 android.widget 包里的。另外,TableLayout 是继承自 LinearLayout.
下面直接贴代码了。
// 利用代码设置 线性布局 private void setLinearLayout(){LinearLayout llayout = new LinearLayout(this);llayout.setOrientation(LinearLayout.VERTICAL); // 设置线性布局的排列方式TextView textView = new TextView(this);textView.setText("代码实现的线性布局");textView.setTextColor(Color.RED);textView.setGravity(Gravity.CENTER); // 设置文本内容的对齐方式LinearLayout.LayoutParams ll_lpara = new LinearLayout.LayoutParams(MP,WC);//ll_lpara.gravity = Gravity.CENTER_HORIZONTAL; // 设置控件在布局中的对齐方式llayout.addView(textView,ll_lpara);Button btn = new Button(this);btn.setText("按钮");llayout.addView(btn,ll_lpara); // 按指定属性添加控件setContentView(llayout); }实现效果图:
=========================================================================
// 利用代码设置 相对布局 private void setRelativeLayout(){RelativeLayout rlayout = new RelativeLayout(this);rlayout.setPadding(10, 10, 10, 10); // 单位: pixelsint textViewID = 100;TextView textView = new TextView(this);textView.setId(textViewID);textView.setText("请输入:");RelativeLayout.LayoutParams rl_lpara1 = new RelativeLayout.LayoutParams(MP, WC);rlayout.addView(textView, rl_lpara1);int editTextID = 200;EditText editText = new EditText(this);editText.setId(editTextID);editText.setBackgroundResource(android.R.drawable.editbox_background); // 设置背景 , 同android:backgroumdRelativeLayout.LayoutParams rl_lpara2 = new RelativeLayout.LayoutParams(MP, WC);rl_lpara2.addRule(RelativeLayout.BELOW,textViewID); // 设置相对属性,需先指定相对控件的IDrlayout.addView(editText, rl_lpara2);int backBtnID = 300;Button backBtn = new Button(this);backBtn.setId(backBtnID);backBtn.setText("返回");RelativeLayout.LayoutParams rl_lpara3 = new RelativeLayout.LayoutParams(WC, WC);rl_lpara3.addRule(RelativeLayout.BELOW, editTextID);rl_lpara3.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); // 设置与父控件的相对属性rlayout.addView(backBtn, rl_lpara3);Button okBtn = new Button(this);okBtn.setText("确定");RelativeLayout.LayoutParams rl_lpara4 = new RelativeLayout.LayoutParams(WC, WC);rl_lpara4.addRule(RelativeLayout.LEFT_OF, backBtnID);rl_lpara4.addRule(RelativeLayout.ALIGN_TOP,backBtnID);rlayout.addView(okBtn, rl_lpara4);setContentView(rlayout); }实现效果图:
=========================================================================
// 利用代码设置 表格布局 private void setTableLayout(){TableLayout tlayout = new TableLayout(this);tlayout.setColumnStretchable(2, true); // 拉长索引从0开始的第2列TableLayout.LayoutParams tl_lpara = new TableLayout.LayoutParams(MP,WC);// 1. TableRow 不需要设置 layout_width, layout_height// 2. TableRow 中的控件不能设置 layout_span 属性TableRow tr1 = new TableRow(this); TextView textView0 = new TextView(this);textView0.setText("第0列");tr1.addView(textView0);TextView textView1 = new TextView(this);textView1.setText("第1列");tr1.addView(textView1);TextView textView2 = new TextView(this);textView2.setText("第2列");textView2.setBackgroundColor(Color.CYAN);tr1.addView(textView2); tlayout.addView(tr1, tl_lpara); TableRow tr2 = new TableRow(this);Button btn0 = new Button(this);btn0.setText("按钮0");tr2.addView(btn0);Button btn1 = new Button(this);btn1.setText("按钮1");tr2.addView(btn1);Button btn2 = new Button(this);btn2.setText("按钮2");tr2.addView(btn2); Button btn3 = new Button(this);btn3.setText("按钮3");tr2.addView(btn3);tlayout.addView(tr2, tl_lpara);setContentView(tlayout); }实现效果图: