Android dialog自定义式样

package com.example.testdialogdemo;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class TestDialogDemoActivity extends Activity {	private Button btn;	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		btn = (Button) findViewById(R.id.btn);		btn.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				CreateDialog();			}		});	}	private void CreateDialog() {		AlertDialog.Builder builder = new AlertDialog.Builder(this);		AlertDialog dialog = builder.create();		dialog.show();		dialog.setContentView(R.layout.update_alert_dialog_force);		TextView update_alert_title = (TextView) dialog.findViewById(R.id.update_alert_title);		update_alert_title.setText("升级提醒");		TextView update_alert_content = (TextView) dialog.findViewById(R.id.update_alert_content);		update_alert_content.setText("软件升级\n软件升级\n软件升级\n软件升级\n");		Button update_alert_dialog_btn_ok = (Button) dialog.findViewById(R.id.update_alert_dialog_btn_ok);		update_alert_dialog_btn_ok.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				Toast.makeText(getApplicationContext(), "shengji ", 1).show();			}		});	}}

xml如下，

<?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="210dp"    android:background="@android:color/black"    android:orientation="vertical" >    <RelativeLayout        android:layout_width="250dp"        android:layout_height="wrap_content"        android:gravity="center_vertical"        android:paddingBottom="2dp"        android:paddingLeft="5dp"        android:paddingRight="5dp"        android:paddingTop="2dp" >        <ImageView            android:id="@+id/update_alert_ico"            android:layout_width="30dp"            android:layout_height="30dp"            android:src="@drawable/dyd" />        <TextView            android:id="@+id/update_alert_title"            android:layout_width="wrap_content"            android:layout_height="30dp"            android:layout_marginLeft="2dp"            android:gravity="center_vertical"            android:layout_toRightOf="@+id/update_alert_ico"            android:textSize="14.0sp"            android:textStyle="bold" />    </RelativeLayout>    <View        android:layout_width="wrap_content"        android:layout_height="2dp"        android:background="#666666" />    <ScrollView        android:layout_width="fill_parent"        android:layout_height="100dp"        android:layout_margin="10dp"        android:scrollbars="none" >        <TextView            android:id="@+id/update_alert_content"            android:layout_width="fill_parent"            android:layout_height="fill_parent"            android:textColor="@android:color/white"            android:textSize="14.0sp" >        </TextView>    </ScrollView>    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center" >        <Button            android:id="@+id/update_alert_dialog_btn_ok"            android:layout_width="120dip"            android:layout_height="wrap_content"            android:layout_marginBottom="5dp"            android:layout_marginTop="5dp"            android:background="@drawable/btn_bg_alertdialog_def_left"            android:gravity="center"            android:text="立即升级"            android:textColor="@android:color/black"            android:textSize="14.0sp"            android:textStyle="bold" >        </Button>    </LinearLayout></LinearLayout>