安卓笔记 0 加载模板和设置事件的DEMO

　　在onCreate的方法中加载模板2种主要方式：

　　　　1：

运行下面代码

setContentView(R.layout.activity_main);

　　　　2：

运行下面代码

        LinearLayout mainLinearLayout = (LinearLayout)getLayoutInflater().inflate(R.layout.activity_main, null);
        setContentView( mainLinearLayout );

　　

　　主页面布局 activity_main.xml

运行下面代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".main">

    <TextView
        android:text="@string/textview1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="按钮1"/>

</LinearLayout>

　　副页面布局 test.xml

运行下面代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:text="textView2"/>
</LinearLayout>

　　activety_main的入口文件 main.java  ： 包含findViewById方法， implements OnClickListener继承点击事件

运行下面代码

package com.demo0.nono.demo_view;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.util.Log;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Button;

public class main extends Activity  implements OnClickListener {

    private Button button1;
    private EditText editText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        LinearLayout mainLinearLayout = (LinearLayout)getLayoutInflater().inflate(R.layout.activity_main, null);
        setContentView( mainLinearLayout );

        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(this);
        LinearLayout testLinearLayout = (LinearLayout)getLayoutInflater().inflate(R.layout.test,null);
        mainLinearLayout.addView(testLinearLayout);

        editText = new EditText(this);
        editText.setText("edit test content");
        editText.setGravity(Gravity.LEFT);
        editText.setSingleLine(false);

        Log.d("init","app init");
        mainLinearLayout.addView(editText, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));
    }

    @Override
    public void onClick(View view) {
        Log.d("click","click");
        int val = editText.getGravity() & 0x07;
        if( val == Gravity.LEFT ){
            editText.setGravity(Gravity.CENTER_HORIZONTAL);
        }else if( val == Gravity.CENTER_HORIZONTAL ) {
            editText.setGravity(Gravity.RIGHT);
        }else{
            editText.setGravity(Gravity.LEFT);
        }
    }


}