android脚步---不同界面之间切换

对于一个app，可能需要多个界面，使用Button或者其他控件在不同界面之间切换，那么如何做到呢

首先必须明确，一般一个activity.java文件一般只对应一个界面即一个layout.xml文件，还有可能是在一个界面上再引入一个半屏或者全屏，这样需要用到一些手段，例子在下面放出来。

通常需要新建一个java文件，然后进行处理，新建java文件过程如下：New-class-

输入Name，选择继承的类，一般都是选择最通用的安卓原生的activity类，finish之后得到一个新的java文件，为了方便，可以右键，source-override，选择方法重载，比如，oncreate 等

以自己接触到的代码为例：

mTestDialog = new CustomDialog.Builder(this).create(testView2,
                R.style.FullScreenDialog, Gravity.NO_GRAVITY);
        mTestDialog.show();

引入一个全屏文件，新建一个CustomDialog.Builder,建立一个testvie2的全屏xml文件的关联dialog，然后显示这个dialog，

CustomDialog.java文件

package com.leadcore.uudatoutie.ui;

import com.leadcore.uudatoutie.PhotoUI;
import com.leadcore.uudatoutie.R;
import com.leadcore.uudatoutie.util.LogMan;

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.drawable.Drawable;
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;

/**
 *
 * Create custom Dialog windows for your application
 * Custom dialogs rely on custom layouts wich allow you to
 * create and use your own look & feel.
 *
 * Under GPL v3 : http://www.gnu.org/licenses/gpl-3.0.html
 *
 * @author antoine vianey
 *
 */
public class CustomDialog extends Dialog {
    private static final String TAG = "CustomDialog";

    private static View layout;

    public CustomDialog(Context context, int theme) {
        super(context, theme);
    }

    public CustomDialog(Context context) {
        super(context);
    }

    @Override
    public void setTitle(CharSequence title) {
        ((TextView) layout.findViewById(R.id.title)).setText(title);
    }

    public void setIcon(Drawable drawable) {
        ((TextView) layout.findViewById(R.id.title)).setCompoundDrawables(drawable, null, null, null);
    }

    /**
     * Helper class for creating a custom dialog
     */
    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;
        }

        /**
         * Set the Dialog message from String
         * @param title
         * @return
         */
        public Builder setMessage(String message) {
            this.message = message;
            return this;
        }

        /**
         * Set the Dialog message from resource
         * @param title
         * @return
         */
        public Builder setMessage(int message) {
            this.message = (String) context.getText(message);
            return this;
        }

        /**
         * Set the Dialog title from resource
         * @param title
         * @return
         */
        public Builder setTitle(int title) {
            this.title = (String) context.getText(title);
            return this;
        }

        /**
         * Set the Dialog title from String
         * @param title
         * @return
         */
        public Builder setTitle(String title) {
            this.title = title;
            return this;
        }

        /**
         * Set a custom content view for the Dialog.
         * If a message is set, the contentView is not
         * added to the Dialog...
         * @param v
         * @return
         */
        public Builder setContentView(View v) {
            this.contentView = v;
            return this;
        }

        /**
         * Set the positive button resource and it's listener
         * @param positiveButtonText
         * @param listener
         * @return
         */
        public Builder setPositiveButton(int positiveButtonText,
                DialogInterface.OnClickListener listener) {
            this.positiveButtonText = (String) context
                    .getText(positiveButtonText);
            this.positiveButtonClickListener = listener;
            return this;
        }

        /**
         * Set the positive button text and it's listener
         * @param positiveButtonText
         * @param listener
         * @return
         */
        public Builder setPositiveButton(String positiveButtonText,
                DialogInterface.OnClickListener listener) {
            this.positiveButtonText = positiveButtonText;
            this.positiveButtonClickListener = listener;
            return this;
        }

        /**
         * Set the negative button resource and it's listener
         * @param negativeButtonText
         * @param listener
         * @return
         */
//        public Builder setNegativeButton(int negativeButtonText,
//                DialogInterface.OnClickListener listener) {
//            this.negativeButtonText = (String) context
//                    .getText(negativeButtonText);
//            this.negativeButtonClickListener = listener;
//            return this;
//        }

        /**
         * Set the negative button text and it's listener
         * @param negativeButtonText
         * @param listener
         * @return
         */
//        public Builder setNegativeButton(String negativeButtonText,
//                DialogInterface.OnClickListener listener) {
//            this.negativeButtonText = negativeButtonText;
//            this.negativeButtonClickListener = listener;
//            return this;
//        }

        /**
         * Create the custom dialog
         */
        public CustomDialog create(View view, int style, int gravity) {
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            // instantiate the dialog with the custom Theme
            final CustomDialog dialog = new CustomDialog(context, style);
            layout = view;
//            diaLogMan.addContentView(layout, new LayoutParams(
//                  LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
            // set the dialog title
            if(title!=null){
                ((TextView) layout.findViewById(R.id.title)).setText(title);
            }
            // set the confirm button
            if (positiveButtonText != null) {
                ((Button) layout.findViewById(R.id.cancelButton))
                        .setText(positiveButtonText);
                if (positiveButtonClickListener != null) {
                    ((Button) layout.findViewById(R.id.cancelButton))
                            .setOnClickListener(new View.OnClickListener() {
                                public void onClick(View v) {
                                    LogMan.e(TAG,"positiveButtonClickListener");
                                    positiveButtonClickListener.onClick(
                                            dialog,
                                            DialogInterface.BUTTON_POSITIVE);
                                    dialog.dismiss();
                                }
                            });
                }
            } else {
//                // if no confirm button just set the visibility to GONE
//                layout.findViewById(R.id.cancelButton).setVisibility(
//                        View.GONE);
            }
            // set the content message
            if (message != null) {
                ((TextView) layout.findViewById(
                        R.id.message)).setText(message);
            } else if (contentView != null) {
                // if no message set
                // add the contentView to the dialog body
                ((LinearLayout) layout.findViewById(R.id.content))
                        .removeAllViews();
                ((LinearLayout) layout.findViewById(R.id.content))
                        .addView(contentView,
                                new LayoutParams(
                                        LayoutParams.FILL_PARENT,
                                        LayoutParams.WRAP_CONTENT));
            }
            dialog.getWindow().setGravity(gravity);
            dialog.setContentView(layout);
            return dialog;
        }

    }

}

如何在其他应用里面仿照这个方法不单要CustomDialog.java文件，还需要扩展Custom-dialog.xml文件

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <LinearLayout
        android:orientation="vertical"
        android:background="@drawable/photoframe_title"
        android:layout_width="fill_parent"
        android:layout_height="@dimen/dialog_title_height"
        android:gravity="center_vertical">

        <TextView
            android:id="@+id/title"
            android:paddingRight="10dip"
            android:paddingLeft="10dip"
            android:layout_width="wrap_content"
            android:layout_gravity="center"
            android:layout_height="wrap_content"
            style="@style/MyDialogTitle"/>

    </LinearLayout>

    <LinearLayout
        android:id="@+id/content"
        android:orientation="horizontal"
        android:background="@android:color/white"
        android:paddingTop="10dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/share_weixin"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:padding="5dip"
            android:drawableTop="@drawable/share_weixin"
            android:text="@string/review_share_weixin"
            android:gravity="center_horizontal"
            android:textColor="@color/text_dialog_button_title"
            android:background="@drawable/bg_pressed"/>
        <TextView
            android:id="@+id/share_weixin_guys"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:padding="5dip"
            android:drawableTop="@drawable/share_weixin_guys"
            android:text="@string/review_share_weixin_guys"
            android:gravity="center_horizontal"
            android:textColor="@color/text_dialog_button_title"
            android:background="@drawable/bg_pressed"/>
        <TextView
            android:id="@+id/share_sina"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:padding="5dip"
            android:drawableTop="@drawable/share_sina"
            android:text="@string/review_share_sina"
            android:gravity="center_horizontal"
            android:textColor="@color/text_dialog_button_title"
            android:background="@drawable/bg_pressed"/>
        <TextView
            android:id="@+id/share_more"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:padding="5dip"
            android:drawableTop="@drawable/share_more"
            android:text="@string/review_share_more"
            android:gravity="center_horizontal"
            android:textColor="@color/text_dialog_button_title"
            android:background="@drawable/bg_pressed"/>
</LinearLayout>

    <LinearLayout
        android:orientation="horizontal"
        android:background="@android:color/white"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/cancelButton"
            android:layout_width="match_parent"
            style="@style/MyDialogButton"
            />
    </LinearLayout>

</LinearLayout>