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  首先如果要在程序中使用sdcard进行存储，我们必须要在AndroidManifset.xml文件进行下面的权限设置:  在AndroidManifest.xml中加入访问SDCard的权限如下:                  接着我们在使用SDcard进行读写的时候 会用到Environment类下面的几个静态方法     1: getDataDirectory()  获取到Androi中的data数据目录    2:getDownloadCacheDirectory()  获取到下载的缓存目录    3:getExternalStorageDirectory()  获取到外部存储的目录 一般指SDcard    4:getExternalStorageState() 获取外部设置的当前状态 一般指SDcard,          android系统中对于外部设置的状态，我们比较常用的应该是 MEDIA_MOUNTED（SDcard存在并且可以进行读写）  MEDIA_MOUNTED_READ_ONLY (SDcard存在，只可以进行读操作)  当然还有其他的一些状态，可以在文档中进行查找到     5:getRootDirectory()  获取到Android Root路径    6:isExternalStorageEmulated() 返回Boolean值判断外部设置是否有效    7:isExternalStorageRemovable()  返回Boolean值，判断外部设置是否可以移除  

android调用摄像头拍摄一段视频并上传

package com.zf.iosdialog.widget;import android.app.Dialog;import android.content.Context;import android.view.Display;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.WindowManager;import android.widget.Button;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;import com.zf.iosdialog.R;public class AlertDialog {private Context context;private Dialog dialog;private LinearLayout lLayout_bg;private TextView txt_title;private TextView txt_msg;private Button btn_neg;private Button btn_pos;private ImageView img_line;private Display display;private boolean showTitle = false;private boolean showMsg = false;private boolean showPosBtn = false;private boolean showNegBtn = false;public AlertDialog(Context context) {this.context = context;WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);display = windowManager.getDefaultDisplay();}public AlertDialog builder() {// 获取Dialog布局View view = LayoutInflater.from(context).inflate(R.layout.view_alertdialog, null);// 获取自定义Dialog布局中的控件lLayout_bg = (LinearLayout) view.findViewById(R.id.lLayout_bg);txt_title = (TextView) view.findViewById(R.id.txt_title);txt_title.setVisibility(View.GONE);txt_msg = (TextView) view.findViewById(R.id.txt_msg);txt_msg.setVisibility(View.GONE);btn_neg = (Button) view.findViewById(R.id.btn_neg);btn_neg.setVisibility(View.GONE);btn_pos = (Button) view.findViewById(R.id.btn_pos);btn_pos.setVisibility(View.GONE);img_line = (ImageView) view.findViewById(R.id.img_line);img_line.setVisibility(View.GONE);// 定义Dialog布局和参数dialog = new Dialog(context, R.style.AlertDialogStyle);dialog.setContentView(view);// 调整dialog背景大小lLayout_bg.setLayoutParams(new FrameLayout.LayoutParams((int) (display.getWidth() * 0.85), LayoutParams.WRAP_CONTENT));return this;}public AlertDialog setTitle(String title) {showTitle = true;if ("".equals(title)) {txt_title.setText("标题");} else {txt_title.setText(title);}return this;}public AlertDialog setMsg(String msg) {showMsg = true;if ("".equals(msg)) {txt_msg.setText("内容");} else {txt_msg.setText(msg);}return this;}public AlertDialog setCancelable(boolean cancel) {dialog.setCancelable(cancel);return this;}public AlertDialog setPositiveButton(String text,final OnClickListener listener) {showPosBtn = true;if ("".equals(text)) {btn_pos.setText("确定");} else {btn_pos.setText(text);}btn_pos.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {listener.onClick(v);dialog.dismiss();}});return this;}public AlertDialog setNegativeButton(String text,final OnClickListener listener) {showNegBtn = true;if ("".equals(text)) {btn_neg.setText("取消");} else {btn_neg.setText(text);}btn_neg.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {listener.onClick(v);dialog.dismiss();}});return this;}private void setLayout() {if (!showTitle && !showMsg) {txt_title.setText("提示");txt_title.setVisibility(View.VISIBLE);}if (showTitle) {txt_title.setVisibility(View.VISIBLE);}if (showMsg) {txt_msg.setVisibility(View.VISIBLE);}if (!showPosBtn && !showNegBtn) {btn_pos.setText("确定");btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);btn_pos.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {dialog.dismiss();}});}if (showPosBtn && showNegBtn) {btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_right_selector);btn_neg.setVisibility(View.VISIBLE);btn_neg.setBackgroundResource(R.drawable.alertdialog_left_selector);img_line.setVisibility(View.VISIBLE);}if (showPosBtn && !showNegBtn) {btn_pos.setVisibility(View.VISIBLE);btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);}if (!showPosBtn && showNegBtn) {btn_neg.setVisibility(View.VISIBLE);btn_neg.setBackgroundResource(R.drawable.alertdialog_single_selector);}}public void show() {setLayout();dialog.show();}}

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