LayoutInflater的作用和findViewById()差不多,不同之處在於LayoutInflater是找layout文件夾下的某個xml佈局文件!而 findViewById()是找某一個xml下的具體 widget控件。
LayoutInflater可以將一個xml佈局文件轉化爲View 類型,其代碼如下:
View Code
package hzx.one;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;
public class HzxDialogActivity extends Activity {
private Button button1;
private Button button2;
private Button button3;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button1=(Button) findViewById(R.id.button1);
button1.setText("默認dialog");
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {showDialog1();}});
button2=(Button) findViewById(R.id.button2);
button2.setText("自定義dialog");
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {showDialog2();}});
button3=(Button) findViewById(R.id.button3);
button3.setText("自定義toast");
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast toast=new Toast(HzxDialogActivity.this);
//三種方法定義LayoutInflater
//LayoutInflater li=getLayoutInflater();
//LayoutInflater li = LayoutInflater.from(HzxDialogActivity.this);
LayoutInflater li = (LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE);
View view=li.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
toast.setView(view);
toast.setDuration(Toast.LENGTH_SHORT);
toast.setGravity(0, -20, 20);
toast.show();
}});
}
private void showDialog1() {
AlertDialog.Builder builder=new Builder(this);
builder.setMessage("are you sure to exit ?");
builder.setTitle("exit or not ");
builder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {dialog.dismiss();HzxDialogActivity.this.finish();}});
builder.setNegativeButton("no", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});
builder.create().show();
}
private void showDialog2(){
AlertDialog.Builder builder=new Builder(this);
LayoutInflater li=getLayoutInflater();
View v=li.inflate(R.layout.dialog, (ViewGroup)findViewById(R.id.dialog));
builder.setView(v);
builder.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {dialog.dismiss();HzxDialogActivity.this.finish();}});
builder.setNegativeButton("no", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {dialog.dismiss();}});
builder.create().show();
}
}
main.xml佈局文件
<?xml version="1.0" encoding="utf-8"?> <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="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="Button" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> <Button android:text="Button" android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button> </LinearLayout>
dialog.xml佈局文件:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal" android:id="@+id/dialog"> <ImageView android:id="@+id/imageView1" android:layout_height="wrap_content" android:src="@drawable/icon" android:layout_width="wrap_content"></ImageView> <TextView android:layout_height="wrap_content" android:text="@string/hello" android:layout_width="wrap_content" android:id="@+id/textView1"></TextView> </LinearLayout>
演示結果如下:
650) this.width=650;" src="http://pic002.cnblogs.com/images/2011/328051/2011092210295494.png" style="margin:0px;padding:0px;border:0px;" />
默認dialog:
650) this.width=650;" src="http://pic002.cnblogs.com/images/2011/328051/2011092210302937.png" style="margin:0px;padding:0px;border:0px;" />
自定義dialog:
650) this.width=650;" src="http://pic002.cnblogs.com/images/2011/328051/2011092210310180.png" style="margin:0px;padding:0px;border:0px;" />
自定義toast:
650) this.width=650;" src="http://pic002.cnblogs.com/images/2011/328051/2011092210312793.png" style="margin:0px;padding:0px;border:0px;" />
參考:http://www.cnblogs.com/zhukoo/archive/2011/09/22/2184798.html