学步园

现在很多应用的头像设置都要求从屏幕底部弹出对话框，因为Android系统自带的对话框都是在屏幕中央，所以对于显示在底部的对话框就需要自己定义了。

代码如下：

package com.org.buttomdialog;

import android.app.Dialog;
import android.app.AlertDialog.Builder;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;

public class MainActivity extends ActionBarActivity {
	private Dialog setHeadDialog;
	private View mDialogView;
	private Button mButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mButton = (Button) findViewById(R.id.button1);

		mButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				showDialog();
			}
		});
	}

	public void showDialog() {
		setHeadDialog = new Builder(this).create();
		setHeadDialog.show();
		mDialogView = View.inflate(getApplicationContext(),
				R.layout.layout_dialog, null);

		setHeadDialog.getWindow().setContentView(mDialogView);

		WindowManager windowManager = this.getWindowManager();
		Display display = windowManager.getDefaultDisplay();
		WindowManager.LayoutParams lp = setHeadDialog.getWindow()
				.getAttributes();
		lp.width = (int) (display.getWidth()); // 设置宽度
		setHeadDialog.getWindow().setAttributes(lp);
		bindDialogEvent();

	}

	private void bindDialogEvent() {
		Button cameraButton = (Button) mDialogView
				.findViewById(R.id.iv_userinfo_takepic);
		Button photoButton = (Button) mDialogView
				.findViewById(R.id.iv_userinfo_choosepic);
		Button cancelButton = (Button) mDialogView
				.findViewById(R.id.iv_userinfo_cancle);

		cameraButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				setHeadDialog.dismiss();
			}
		});
		photoButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				setHeadDialog.dismiss();
			}
		});
		cancelButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				setHeadDialog.dismiss();
			}
		});
	}
}

自定义布局：layout_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="#000000"
        android:gravity="center_horizontal"
        android:orientation="vertical" >

        <LinearLayout
            
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#ffffff"
            android:gravity="center"
            android:orientation="vertical"
            android:padding="7dp" >

            <Button
                android:id="@+id/iv_userinfo_takepic"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/green_btn_selector" 
                android:text="拍照"/>
        </LinearLayout>

        <LinearLayout
          
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#ffffff"
            android:gravity="center_horizontal"
            android:orientation="vertical"
            android:padding="7dp" >

            <Button
                  android:id="@+id/iv_userinfo_choosepic"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/green_btn_selector" 
                android:text="从相册选择"/>
        </LinearLayout>

        <LinearLayout
           
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#ffffff"
            android:gravity="center_horizontal"
            android:orientation="vertical"
            android:padding="7dp" > 

            <Button
                 android:id="@+id/iv_userinfo_cancle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/gray_btn_selector" 
                android:text="取消"/>
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

对于Button的选择效果的xml文件就不贴出了。

运行效果如下：