自定义 Android 对话框 (AlertDialog) 的实现

package l.l; import l.l.R; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; /** *创建自定义对话框窗口为您的应用程序 *自定义对话框依靠自定义布局未允许你 *创建和使用自己的外观和感觉。 */ public class CustomDialog extends Dialog { public CustomDialog(Context context, int theme) { super(context, theme); } public CustomDialog(Context context) { super(context); } /** * Helper类创建一个自定义对话框 */ public static class Builder { private Context context; private String title; private String message; private String positiveButtonText; private String negativeButtonText; private View contentView; private DialogInterface.OnClickListener positiveButtonClickListener, negativeButtonClickListener; public Builder(Context context) { this.context = context; } /** * 设置对话框消息从字符串 * @param title * @return */ public Builder setMessage(String message) { this.message = message; return this; } /** * 设置对话框信息资源 * @param title * @return */ public Builder setMessage(int message) { this.message = (String) context.getText(message); return this; } /** * 设置对话框的标题从资源 * @param title * @return */ public Builder setTitle(int title) { this.title = (String) context.getText(title); return this; } /** * 设置对话框的标题从字符串 * @param title * @return */ public Builder setTitle(String title) { this.title = title; return this; } /** *设置一个自定义内容视图对话框。 *如果一个消息集,contentView不是 *添加到对话框…… * @param v * @return */ public Builder setContentView(View v) { this.contentView = v; return this; } /** * 设置资源和它的积极按钮侦听器 * @param positiveButtonText * @param listener * @return */ public Builder setPositiveButton(int positiveButtonText, DialogInterface.OnClickListener listener) { this.positiveButtonText = (String) context .getText(positiveButtonText); this.positiveButtonClickListener = listener; return this; } /** * 设置按钮的文本和它的积极的侦听器 * @param positiveButtonText * @param listener * @return */ public Builder setPositiveButton(String positiveButtonText, DialogInterface.OnClickListener listener) { this.positiveButtonText = positiveButtonText; this.positiveButtonClickListener = listener; return this; } /** * 设置负按钮的侦听器资源和它 * @param negativeButtonText * @param listener * @return */ public Builder setNegativeButton(int negativeButtonText, DialogInterface.OnClickListener listener) { this.negativeButtonText = (String) context .getText(negativeButtonText); this.negativeButtonClickListener = listener; return this; } /** * 设置按钮的文本和它的负面的侦听器 * @param negativeButtonText * @param listener * @return */ public Builder setNegativeButton(String negativeButtonText, DialogInterface.OnClickListener listener) { this.negativeButtonText = negativeButtonText; this.negativeButtonClickListener = listener; return this; } /** * 创建自定义对话框 */ public CustomDialog create() { LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); // instantiate the dialog with the custom Theme final CustomDialog dialog = new CustomDialog(context, R.style.Dialog); View layout = inflater.inflate(R.layout.dialog, null); dialog.addContentView(layout, new LayoutParams( LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT)); // set the dialog title ((TextView) layout.findViewById(R.id.title)).setText(title); // set the confirm button if (positiveButtonText != null) { ((Button) layout.findViewById(R.id.positiveButton)) .setText(positiveButtonText); if (positiveButtonClickListener != null) { ((Button) layout.findViewById(R.id.positiveButton)) .setOnClickListener(new View.OnClickListener() { public void onClick(View v) { positiveButtonClickListener.onClick( dialog, DialogInterface.BUTTON_POSITIVE); } }); } } else { // 如果没有确认按钮只是设置能见度来走 layout.findViewById(R.id.positiveButton).setVisibility(View.GONE); } // 设置取消按钮 if (negativeButtonText != null) { ((Button) layout.findViewById(R.id.negativeButton)) .setText(negativeButtonText); if (negativeButtonClickListener != null) { ((Button) layout.findViewById(R.id.negativeButton)) .setOnClickListener(new View.OnClickListener() { public void onClick(View v) { positiveButtonClickListener.onClick( dialog, DialogInterface.BUTTON_NEGATIVE); } }); } } else { // 如果没有确认按钮只是设置能见度来走 layout.findViewById(R.id.negativeButton).setVisibility(View.GONE); } // 设定内容信息 if (message != null) { ((TextView) layout.findViewById( R.id.message)).setText(message); } else if (contentView != null) { // 如果没有消息集 的对话框添加contentView body ((LinearLayout) layout.findViewById(R.id.content)) .removeAllViews(); ((LinearLayout) layout.findViewById(R.id.content)) .addView(contentView, new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); } dialog.setContentView(layout); return dialog; } } }