在实际开发种LayoutInflater这个类还是非常有用的,它的作用类似于findViewById(),
不同点是LayoutInflater是用来找layout下xml布局文件,并且实例化!而findViewById()是找具体xml下的具体widget控件(如:Button,TextView等)。
为了让大家容易理解我做了一个简单的Demo,主布局main.xml里有一个TextView和一个Button,当点击Button,出现Dialog,而这个Dialog的布局方式是我们在layout目录下定义的custom_dialog.xml文件(里面左右分布,左边ImageView,右边TextView)。
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:id="@+id/textview"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button"
android:text="inflater"
/>
</LinearLayout>
再新建一个自定义的layout的:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"/>
<TextView
android:id="@+id/tview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#F0F"
android:text="image"
/>
</LinearLayout>
MainActivity.java如下:
package com.example.androidinflatertest;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends Activity {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button)findViewById(R.id.button);
button.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showCustomerDialog();
}
private void showCustomerDialog() {
// TODO Auto-generated method stub
AlertDialog.Builder builder;
AlertDialog alertdialog;
Context context=MainActivity.this;
LayoutInflater inflater=(LayoutInflater)context.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout=inflater.inflate(R.layout.custom_dialog, null);
TextView text=(TextView)layout.findViewById(R.id.tview);
ImageView image=(ImageView)layout.findViewById(R.id.imageview);
image.setImageResource(R.drawable.ia);
builder=new AlertDialog.Builder(context);
builder.setView(layout);
alertdialog=builder.create();
alertdialog.show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
运行结果: