Android布局代码实现

周sir | 2015年4月20日 | Android UI界面 | 0 条评论 | 1647

代码实现线型布局和相对布局以入LayoutInflater使用
LayoutInflater介绍

 LayoutInflater mInflater = LayoutInflater.from(context);
     ViewGroup parent;
     View v = mInflater.inflate(R.layout.item_simpleadapter_view, parent,true);
     View v = mInflater.inflate(R.layout.item_simpleadapter_view, parent,false);
     View v = mInflater.inflate(R.layout.item_simpleadapter_view, null);

      public View inflate(int resourceId, ViewGroup root, boolean attachToRoot)

      <1>如果设置了ViewGroup root参数，且attachToRoot设置为false的话,
      则会从root中得到由layout_width和layout_height组成的LayoutParams,
      就会对我们加载的视图View设置该LayoutParams。

      <2>如果设置了ViewGroup root参数，且attachToRoot设置为true的话，
      则将我们加载的视图做为子视图添加到root视图中。

      <3>如果我们ViewGroup root设置为空的话，就直接返回我们创建的视图；



代码实现线型布局和相对布局

public void setLineraLayout() {
     LinearLayout lineraLayout = newLinearLayout(this);
     lineraLayout.setOrientation(LinearLayout.VERTICAL);

     LayoutParams layoutParams = newLinearLayout.LayoutParams(
          LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
     lineraLayout.setLayoutParams(layoutParams);

     TextView textView = newTextView(this);
     textView.setGravity(Gravity.CENTER);
     textView.setText("子元素0");
     textView.setTextSize(20);
     textView.setBackgroundColor(R.color.myblue);
     textView.setLayoutParams(newLinearLayout.LayoutParams(
          LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

     TextView textView1 = newTextView(this);
     textView1.setGravity(Gravity.CENTER);
     textView1.setText("子元素1");
     textView1.setTextSize(20);
     textView1.setBackgroundColor(Color.BLUE);
     textView1.setLayoutParams(newLinearLayout.LayoutParams(
          LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

     lineraLayout.addView(textView);
     lineraLayout.addView(textView1);

     setContentView(lineraLayout);

  }

  publicvoidsetRelationLayout() {
     RelativeLayout rl = newRelativeLayout(this);

     Button btn1 = newButton(this);
     btn1.setText("----------1------------");
     btn1.setId(1);

     RelativeLayout.LayoutParams lp1 = newRelativeLayout.LayoutParams(
          ViewGroup.LayoutParams.WRAP_CONTENT,
          ViewGroup.LayoutParams.WRAP_CONTENT);
     
     lp1.addRule(RelativeLayout.ALIGN_PARENT_TOP);
     lp1.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
     // btn1 位于父 View 的顶部，在父 View 中水平居中
     rl.addView(btn1, lp1);

     Button btn2 = newButton(this);
     btn2.setText("|\n|\n2\n|\n|\n|");
     btn2.setId(2);

     RelativeLayout.LayoutParams lp2 = newRelativeLayout.LayoutParams(
          ViewGroup.LayoutParams.WRAP_CONTENT,
          ViewGroup.LayoutParams.WRAP_CONTENT);
     lp2.addRule(RelativeLayout.BELOW, 1);
     lp2.addRule(RelativeLayout.ALIGN_LEFT, 1);
     // btn2 位于 btn1 的下方、其左边和 btn1 的左边对齐
     rl.addView(btn2, lp2);

     Button btn3 = newButton(this);
     btn3.setText("|\n|\n3\n|\n|\n|");
     btn3.setId(3);

     RelativeLayout.LayoutParams lp3 = newRelativeLayout.LayoutParams(
          ViewGroup.LayoutParams.WRAP_CONTENT,
          ViewGroup.LayoutParams.WRAP_CONTENT);
     lp3.addRule(RelativeLayout.BELOW, 1);
     lp3.addRule(RelativeLayout.RIGHT_OF, 2);
     lp3.addRule(RelativeLayout.ALIGN_RIGHT, 1);
     // btn3 位于 btn1 的下方、btn2 的右方且其右边和 btn1 的右边对齐（要扩充）
     rl.addView(btn3, lp3);

     Button btn4 = newButton(this);
     btn4.setText("-----------------4--------------");
     btn4.setId(4);

     RelativeLayout.LayoutParams lp4 = newRelativeLayout.LayoutParams(
          ViewGroup.LayoutParams.WRAP_CONTENT,
          ViewGroup.LayoutParams.WRAP_CONTENT);
     lp4.addRule(RelativeLayout.BELOW, 2);
     lp4.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
     // btn4 位于 btn2 的下方，在父 Veiw 中水平居中
     rl.addView(btn4, lp4);

     setContentView(rl);

  }