Android 中的布局方式之线性布局


android中我们知道,可以用main.xml等方式来布局一个activity的状态,但是我们也可以用代码的方式来进行布局,从而抛弃那种xml方式的布局,代码如下:


package com.andy.android.layout;

import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class LayoutTestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LinearLayout layout = new LinearLayout(getApplicationContext());
        LinearLayout.LayoutParams layoutParm = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        layout.setOrientation(LinearLayout.VERTICAL);
        
        //文本text
        TextView text = new TextView(getApplicationContext());
        //设置文本属性
        LinearLayout textLayout = new LinearLayout(getApplicationContext());
        LinearLayout.LayoutParams textParm = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        textLayout.setOrientation(LinearLayout.HORIZONTAL);
        text.setText("just for test");
        text.setTextSize(20);
        //将文本add到线性布局器中
        layout.addView(text, textParm);
        //button
        Button btn = new Button(getApplicationContext());
        LinearLayout btnLayout = new LinearLayout(getApplicationContext());
        LinearLayout.LayoutParams btnParm = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);
        btnLayout.setOrientation(LinearLayout.HORIZONTAL);
        btn.setText("just for button");
        btn.setTextSize(20);
        layout.addView(btn, btnParm);
        //设置activity布局采用layout线性布局,布局方式采用layoutParm方式。
        super.setContentView(layout,layoutParm);
    }
}
这里显示了一个文本和一个button,通篇都是用代码进行布局的,主要流程如下:

先new一个线性布局,设置其布局的属性。然后new一个文本,设置好其参数,然后add到layout中去。

button也是如此,

最终将线性布局器设置为activity的总布局方式。


运行效果如下:



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