android programing 4.4
碎片的生命周期跟activity的差不多,这里就不多说了,以下是我网上找的流程图下面主要说的是如何适配不同尺寸的手机屏幕。首先在res目录下新建个layout-large目录,把layout_activity.xml文件复制一份到这个目录里,然后把原来layout目录下的layout_activity.xml修改为:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:id="@+id/left_fragment"
android:name="com.example.xinwei.fragmentactivity.LeftFragment" />
</LinearLayout>
然后把mainactivity.java文件的两句调用replaceFragement()函数注释掉package com.example.xinwei.fragmentactivity;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(this);
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);
replaceFragment(new RightFragment());
}
private void replaceFragment(Fragment fragment) {
FragmentManager fragmentManager=getSupportFragmentManager();
FragmentTransaction transition=fragmentManager.beginTransaction();
transition.addToBackStack(null);//按back键可以返回
// transition.replace(R.id.right_layout,fragment);
transition.commit();
}
@Override
public void onClick(View view) {
switch(view.getId()){
case R.id.button:
// replaceFragment(new AnotherRightFragment());
break;
case R.id.button1:
TextView textView=(TextView)findViewById(R.id.text_view);
if(textView!=null){
textView.setText("你好");
}
break;
}
}
}
把此项目部署到不同尺寸的浏览器,就会有一个适配不同屏幕的效果,如图:
最小宽度限定也就是把刚才的layout_large文件夹修改成layout-sw600dp就行了,这里就不演示了
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