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MainActivity如下:

package cn.testalertdialog;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.app.Dialog;import android.content.Context;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.view.WindowManager;import android.widget.Button;/** * Demo说明: *  * 自定义Dialog的使用 *  * 1 在屏幕中显示自定义Dialog. *   其中按照屏幕大小设置Dialog的显示大小 *    * 2 在屏幕底部显示自定义Dialog. *   网上有许多资料都有一个缺陷:Dialog距离屏幕底部总有几毫米的间隙. *   试过许多方法和style都不管用.在此给出一个可行的办法.详见代码. * 3 本示例采用API 15即 4.0.3 *  * http://blog.csdn.net/lfdfhl *  */public class MainActivity extends Activity {    private Button mButton;    private Dialog mDialog;    private AlertDialog mAlertDialog;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		init();	}    private void init(){    	mButton=(Button) findViewById(R.id.button);    	mButton.setOnClickListener(new ButtonOnClickListenerImpl());    }	private class ButtonOnClickListenerImpl implements OnClickListener {		@Override		public void onClick(View view) {			switch (view.getId()) {			case R.id.button:				showDialog(MainActivity.this);				//showDialogAtScreenBottom(MainActivity.this);				break;			default:				break;			}		}	}		//显示自定义Dialog	private void showDialog(Context context) {		LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);		View dialogView = inflater.inflate(R.layout.dialogview, null);		mDialog = new Dialog(context, R.style.dialog);		mDialog.setContentView(dialogView);		Window dialogWindow = mDialog.getWindow();		// 获取对话框当前的参数值		WindowManager.LayoutParams layoutParams = dialogWindow.getAttributes();		// 设置对话框高度为屏幕高度的0.3倍		layoutParams.height = (int) (getScreenHeight(context) * 0.3);		// 设置对话框宽度为屏幕宽度的0.7倍		layoutParams.width = (int) (getScreenWidth(context) * 0.7);		dialogWindow.setAttributes(layoutParams);		mDialog.show();		initDialog(dialogView);	}		//在屏幕底部显示自定义Dialog	private void showDialogAtScreenBottom(Context context) {		LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);		View dialogView = inflater.inflate(R.layout.dialogview, null);		mAlertDialog = new AlertDialog.Builder(context, R.style.dialog).create();		mAlertDialog.show();		Window window = mAlertDialog.getWindow();		// 将Dialog显示到屏幕的底部		window.setGravity(Gravity.BOTTOM);		// 去掉Dialog本身的padding		window.getDecorView().setPadding(0, 0, 0, 0);		WindowManager.LayoutParams layoutParams = mAlertDialog.getWindow().getAttributes();		// 设置宽度为屏幕宽度		layoutParams.width = getScreenWidth(context);		mAlertDialog.getWindow().setAttributes(layoutParams);		mAlertDialog.setContentView(dialogView);		initAlertDialog(dialogView);	}			//初始化自定义布局中的控件	private void initDialog(View dialogView){		  Button firstButton=(Button) dialogView.findViewById(R.id.dialog_firstButton);		  firstButton.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View v) {					System.out.println("点击确定");				}			});		  		  Button secondButton=(Button) dialogView.findViewById(R.id.dialog_secondButton);		  secondButton.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View v) {					if (mDialog!=null&&mDialog.isShowing()) {						mDialog.dismiss();					}				}			});	}		//初始化自定义布局中的控件	private void initAlertDialog(View dialogView) {		Button firstButton = (Button) dialogView.findViewById(R.id.dialog_firstButton);		firstButton.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				System.out.println("点击确定");			}		});		Button secondButton = (Button) dialogView.findViewById(R.id.dialog_secondButton);		secondButton.setOnClickListener(new OnClickListener() {			@Override			public void onClick(View v) {				if (mAlertDialog != null && mAlertDialog.isShowing()) {					mAlertDialog.dismiss();				}			}		});	}		/**	 * 获得屏幕高度	 */	public static int getScreenWidth(Context context) {		WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);		DisplayMetrics outMetrics = new DisplayMetrics();		wm.getDefaultDisplay().getMetrics(outMetrics);		return outMetrics.widthPixels;	}	/**	 * 获得屏幕宽度	 */	public static int getScreenHeight(Context context) {		WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);		DisplayMetrics outMetrics = new DisplayMetrics();		wm.getDefaultDisplay().getMetrics(outMetrics);		return outMetrics.heightPixels;	}}

main.xml如下:

style如下:

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