LayoutInflater的使用
LayoutInflater的作用和findViewById()差不多,不同之处在于LayoutInflater是找layout文件夹下的某个xml布局文件！而 findViewById()是找某一个xml下的具体 widget控件。
LayoutInflater可以将一个xml布局文件转化为View 类型，其代码如下：
View Code
1 package hzx.one;
2
3 import android.app.Activity;
4 import android.app.AlertDialog;
5 import android.app.AlertDialog.Builder;
6 import android.content.DialogInterface;
7 import android.os.Bundle;
8 import android.view.LayoutInflater;
9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.Button;
12 import android.widget.Toast;
13
14 public class HzxDialogActivity extends Activity {
15 private Button button1;
16 private Button button2;
17 private Button button3;
18 @Override
19 public void onCreate(Bundle savedInstanceState) {
20 super.onCreate(savedInstanceState);
21 setContentView(R.layout.main);
22 button1=(Button) findViewById(R.id.button1);
23 button1.setText("默认dialog");
24 button1.setOnClickListener(new View.OnClickListener() {
25 @Override
26 public void onClick(View v) {showDialog1();}});
27 button2=(Button) findViewById(R.id.button2);
28 button2.setText("自定义dialog");
29 button2.setOnClickListener(new View.OnClickListener() {
30 @Override
31 public void onClick(View v) {showDialog2();}});
32 button3=(Button) findViewById(R.id.button3);
33 button3.setText("自定义toast");
34 button3.setOnClickListener(new View.OnClickListener() {
35 @Override
36 public void onClick(View v) {
37 Toast toast=new Toast(HzxDialogActivity.this);
38 //三种方法定义LayoutInflater
39 //LayoutInflater li=getLayoutInflater();
40 //LayoutInflater li = LayoutInflater.from(HzxDialogActivity.this);
41 LayoutInflater li = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
42
43 View view=li.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
44 toast.setView(view);
45 toast.setDuration(Toast.LENGTH_SHORT);
46 toast.setGravity(0, -20, 20);
47 toast.show();
48 }});
49 }
50 private void showDialog1() {
51 AlertDialog.Builder builder=new Builder(this);
52 builder.setMessage("are you sure to exit ?");
53 builder.setTitle("exit or not ");
54 builder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
55 @Override
56 public void onClick(DialogInterface dialog, int which) {dialog.dismiss();HzxDialogActivity.this.finish();}});
57 builder.setNegativeButton("no", new DialogInterface.OnClickListener() {
58 @Override
59 public void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});
60 builder.create().show();
61 }
62 private void showDialog2(){
63 AlertDialog.Builder builder=new Builder(this);
64 LayoutInflater li=getLayoutInflater();
65 View v=li.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
66 builder.setView(v);
67 builder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
68 @Override
69 public void onClick(DialogInterface dialog, int which) {dialog.dismiss();HzxDialogActivity.this.finish();}});
70 builder.setNegativeButton("no", new DialogInterface.OnClickListener() {
71 @Override
72 public void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});
73 builder.create().show();
74 }
75 }
main.xml布局文件
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="fill_parent" android:orientation="vertical">
5 <TextView
6 android:layout_width="fill_parent"
7 android:layout_height="wrap_content"
8 android:text="@string/hello"
9 />
10 <Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
11 <Button android:text="Button" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
12 <Button android:text="Button" android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
13 </LinearLayout>
dialog.xml布局文件
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:layout_width="fill_parent"
4 android:layout_height="fill_parent"
5 android:orientation="horizontal"
6 android:id="@+id/dialog">
7
8 <ImageView android:id="@+id/imageView1" android:layout_height="wrap_content" android:src="@drawable/icon" android:layout_width="wrap_content"></ImageView>
9 <TextView android:layout_height="wrap_content" android:text="@string/hello" android:layout_width="wrap_content" android:id="@+id/textView1"></TextView>
10 </LinearLayout>
演示结果如下：
默认dialog:
自定义dialog:
自定义toast：
