[Android] Add View

the sample show the way how to create view or main activity programmatically.

MainActivity.java

package com.example.addview;

import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends Activity {
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  LinearLayout layoutMain = new LinearLayout(this);    
  layoutMain.setOrientation(LinearLayout.VERTICAL);    //設定layout為子物件排列方式為垂直
  setContentView(layoutMain);      //將create的layoutMain(LinearLayout)做為主要的activity
  setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);   //設定layout為顯示方式垂直
     
  //將子頁login_title及login加入layoutMain
     LayoutInflater inflate = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
     RelativeLayout layoutTitle = (RelativeLayout) inflate.inflate(
         R.layout.login_title, null);
     RelativeLayout layoutBody = (RelativeLayout) inflate.inflate(
         R.layout.login, null);

     //設定login_title及login加入layout的屬性
     RelativeLayout.LayoutParams relParam = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.MATCH_PARENT,
         RelativeLayout.LayoutParams.WRAP_CONTENT);
     layoutMain.addView(layoutTitle, relParam);
     layoutMain.addView(layoutBody, relParam);
       
  
     // 動態產生TextView
     TextView tv = new TextView(this);
     tv.setText("Hello World");
      
     // 將 TextView 加入到login.xml中 (在login.xml中的RelativeLayout元件，需命名id名稱(rl_body) 
     RelativeLayout rl_body= (RelativeLayout)findViewById(R.id.rl_body);
     rl_body.addView(tv);
  
  
 }

}

login_title.xml

login.xml

AndroidManifest.xml