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   源码介绍

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[实例简介]开发mp4

[实例截图]

[核心代码]

package com.example.mp4;

import java.io.File;
import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MyFileActivity extends Activity {
	private final String[] FILE_MapTable = { ".3gp", ".mov", ".avi", ".rmvb",
			".wmv", ".mp3", ".mp4" };
	private Vector<String> items = null;// 存放显示的名称
	private Vector<String> paths = null;// 存放文件路径
	private Vector<String> sizes = null;// 存放文件大小
	private String rootPath = "/mnt/sdcard";// 起始文件夹
	private EditText pathEditText;// 路径
	private Button queryButton;// 查询按钮
	private ListView fileListView;// 文件列表

	@Override
	protected void onCreate(Bundle icicle) {
		// TODO Auto-generated method stub
		super.onCreate(icicle);
		setContentView(R.layout.myfile);
		this.setTitle("多媒体文件浏览");
		pathEditText = (EditText) findViewById(R.id.path_edit);
		queryButton = (Button) findViewById(R.id.qry_button);
		fileListView = (ListView) findViewById(R.id.file_listview);
		// 单击按钮事件
		queryButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				File file = new File(pathEditText.getText().toString());
				if (file.exists()) {
					if (file.isFile()) {
						// 如果是媒体文件直接打开
						openFile(pathEditText.getText().toString());
					} else {
						// 打开目录下的文件
						getFileDir(pathEditText.getText().toString());
					}
				} else {
					Toast.makeText(MyFileActivity.this, "找不到位置，请确定位置是否正确！",
							Toast.LENGTH_SHORT).show();
				}
			}
		});
		//设置listitem中的文件被单击时要做的动作
		fileListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int position,
					long arg3) {
				// TODO Auto-generated method stub
				fileOrDir(paths.get(position));
			}
		});
		//打开默认文件夹
		getFileDir(rootPath);
	}
	//重写返回键功能是否为back
	public boolean onKeyDown(int keyCode,KeyEvent event){
		//判断触发键是否为back键
		if(keyCode == KeyEvent.KEYCODE_BACK){
			pathEditText = (EditText)findViewById(R.id.path_edit);
			File file = new File(pathEditText.getText().toString());
			if(rootPath.equals(pathEditText.getText().toString().trim())){
				return super.onKeyDown(keyCode, event);
			}else{
				getFileDir(file.getParent());
				return true;
			}
		}else{
			return super.onKeyDown(keyCode, event);
		}	
	}
	//处理文件或目录的方法
	private void fileOrDir(String path){
		File file = new File(path);
		if(file.isDirectory()){
			getFileDir(file.getPath());
		}else{
			openFile(path);
		}
	}
//获取文件结构的方法
	private void getFileDir(String filePath) {
		// TODO Auto-generated method stub
		pathEditText.setText(filePath);
		items = new Vector<String>();
		paths = new Vector<String>();
		sizes = new Vector<String>();
		File f = new File(filePath);
		File[] files = f.listFiles();
		if (files != null) {
			/* 将所有文件添加到ArrayList中 */
			for (int i = 0; i < files.length; i  ) {
				if (files[i].isDirectory()) {
					items.add(files[i].getName());
					paths.add(files[i].getPath());
					sizes.add("");
				}
			}

			for (int i = 0; i < files.length; i  ) {
				if (files[i].isFile()) {
					String fileName = files[i].getName();
					int index = fileName.lastIndexOf(".");
					if (index > 0) {
						String endName = fileName.substring(index,
								fileName.length()).toLowerCase();
						String type = null;
						for(int x=0;i< FILE_MapTable.length;x  ){
							//符合预先定义的多媒体格式的文件才会在界面中显示
							if(endName.equals(FILE_MapTable[x])){
								type = FILE_MapTable[x];
								break;
							}
						}
						if(type !=null){
							items.add(files[i].getName());
							paths.add(files[i].getPath());
							sizes.add(files[i].length() "");
						}
					}
				}
			}
		}
		fileListView.setAdapter(new FileListAdapter(this,items)); 
	}

	private void openFile(String path) {
		// TODO Auto-generated method stub
		Intent intent = new Intent(MyFileActivity.this,MediaPlayerActivity.class);
		intent.putExtra("path", path);
		startActivity(intent);
		finish();
	}
	//列表适配器
	class FileListAdapter extends BaseAdapter{
		private Vector<String> items =null;//存放显示的名称
		private MyFileActivity myFile;
		public FileListAdapter(MyFileActivity myFile,Vector<String> items){
			this.items = items;
			this.myFile = myFile;
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return items.size();
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return items.elementAt(position);
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return items.size();
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			if(convertView==null){
				//加载列表布局文件
				convertView = myFile.getLayoutInflater().inflate(R.layout.file_item, null);
			}
			//文件名称
			TextView name = (TextView)convertView.findViewById(R.id.name);
			//媒体文件类型
			ImageView music = (ImageView)convertView.findViewById(R.id.music);
			//文件夹类型
			ImageView folder = (ImageView)convertView.findViewById(R.id.folder);
			name.setText(items.elementAt(position));
			if(sizes.elementAt(position).equals("")){
				//隐藏媒体文件图标，显示文件夹图标
				music.setVisibility(View.GONE);
				folder.setVisibility(View.VISIBLE);
			}else{
				music.setVisibility(View.VISIBLE);
				folder.setVisibility(View.GONE);
			}
			return convertView;
		}
		
	}
}