Android之内置和外置sdcard路径显示并且写入数据的方法

package com.example.sdcardcheck; import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.lang.reflect.Array;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method; import android.Manifest;import android.content.Context;import android.content.pm.PackageManager;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.os.storage.StorageManager;import android.support.v7.app.ActionBarActivity;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;import android.widget.Toast; public class MainActivity extends ActionBarActivity { 	public static String TAG = "SdCardCheck";	public TextView mTv;	public Button mBtIn;	public Button mBtout;	public String result = "";	public String inSdcardPath = "";	public String outSdcaraPath = "";		@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		mTv = (TextView)findViewById(R.id.text);		mBtIn = (Button)findViewById(R.id.button_in);		mBtout = (Button)findViewById(R.id.button_out);//		checkPerssiom();		mBtIn.setOnClickListener(new OnClickListener(){			@Override			public void onClick(View v) {				// 获取SD卡的目录				saveDataToSdcard(inSdcardPath, "inSdcard_text.txt");			}		});		mBtout.setOnClickListener(new OnClickListener(){			@Override			public void onClick(View v) {				saveDataToSdcard(outSdcaraPath, "outSdcard_text.txt");			}		});		checkSd();		getCommonPath();		getStoragePath(this, true);		getStoragePath(this, false);		getExternalStoreAvailableSize();		mTv.setText(result);	}		public void checkSd() {		String state = Environment.getExternalStorageState();		result += "Environment.MEDIA_MOUNTED is:" + state.equals(Environment.MEDIA_MOUNTED) + "/n";		result += "Environment.MEDIA_MOUNTED_READ_ONLY is:" + state.equals(Environment.MEDIA_MOUNTED_READ_ONLY) + "/n";		result += "Environment.MEDIA_SHARED is:" + state.equals(Environment.MEDIA_SHARED) + "/n";				Log.d(TAG, "state.equals(Environment.MEDIA_MOUNTED is:" + state.equals(Environment.MEDIA_MOUNTED));		Log.d(TAG, "state.equals(Environment.MEDIA_MOUNTED_READ_ONLY is:" + state.equals(Environment.MEDIA_MOUNTED_READ_ONLY));		Log.d(TAG, "state.equals(Environment.MEDIA_SHARED is:" + state.equals(Environment.MEDIA_SHARED));	}		public String getStoragePath(Context mContext, boolean is_removale) { 		StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);		Class<?> storageVolumeClazz = null;		try {			storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");			Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");			Method getPath = storageVolumeClazz.getMethod("getPath");			Method isRemovable = storageVolumeClazz.getMethod("isRemovable");			Object resultObject = getVolumeList.invoke(mStorageManager);			final int length = Array.getLength(resultObject);			for (int i = 0; i < length; i++) {				Object storageVolumeElement = Array.get(resultObject, i);				 String path = (String) getPath.invoke(storageVolumeElement);				 boolean removable = (Boolean) isRemovable.invoke(storageVolumeElement);				 if (is_removale == removable) {					if (is_removale) {					 result += "sdcard外部存储路经" + path + "/n";					 outSdcaraPath = path;					} else {					 result += "sdcard内部存储路经" + path + "/n";					 inSdcardPath = path;					}					return path;				 }			}	 } catch (ClassNotFoundException e) {	 	e.printStackTrace();		} catch (InvocationTargetException e) {		 e.printStackTrace();		} catch (NoSuchMethodException e) {		 e.printStackTrace();		} catch (IllegalAccessException e) {		 e.printStackTrace();		}		return null;	}			public void showSdCard() {		//String sdcardPath = System.getenv("EXTERNAL_STORAGE");		String sdcardPath = Environment.getExternalStorageDirectory().getAbsolutePath();		result += "sdcard内部存储路经" + sdcardPath + "/n";		String extSdcardPaht = System.getenv("SECONDARY_STORAGE");		result += "sdcard外部存储路经" + extSdcardPaht + "/n";			} /**   * 得到外部存储可用的空间   * @return 剩余空间的大小，单位是Byte   */  public long getExternalStoreAvailableSize(){  	String state = Environment.getExternalStorageState();  if(state.equals(Environment.MEDIA_MOUNTED) || state.equals(Environment.MEDIA_SHARED)) {    // 取得sdcard文件路径    File pathFile = Environment.getExternalStorageDirectory();    android.os.StatFs statfs = new android.os.StatFs(pathFile.getPath());    // 获取SDCard上每个block的SIZE    long nBlocSize = statfs.getBlockSize();    // 获取可供程序使用的Block的数量    long nAvailaBlock = statfs.getAvailableBlocks();    // 计算 SDCard 剩余大小Byte    long nSDFreeSize = nAvailaBlock * nBlocSize ;   if (nSDFreeSize > 1024 * 1024 * 1024) {   	result += "外部存储可用的空间:" + nSDFreeSize/(1024 * 1024 * 1024) + "G/n";   } else {   	result += "外部存储可用的空间:" + nSDFreeSize + "Byte/n";   }   return nSDFreeSize;   } else {  	result += "size:" + "0" + "/n";  }  return 0;  }  // public void checkPerssiom() {// 	if (Build.VERSION.SDK_INT >= 23) { // 		 int REQUEST_CODE_CONTACT = 101;//  		 String[] permissions = {Manifest.permission.WRITE_EXTERNAL_STORAGE}; //  		 //验证是否许可权限    //  		 for (String str : permissions) {     //  			 if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) { //  				 //申请权限      //  				 this.requestPermissions(permissions, REQUEST_CODE_CONTACT); //  				 return;//  			 } else {//  				 Log.d(TAG, "this.checkSelfPermission(str) == PackageManager.PERMISSION_GRANTED");//  			 }//  	 } // 	}//	}  public void getCommonPath() { 	File file = Environment.getExternalStorageDirectory(); 	String path = file.getAbsolutePath(); 	result += "sdcard存储路经" + path + "/n"; 	mTv.post(new Runnable(){			@Override			public void run() {				mTv.setText(result);			}		}); } public void saveDataToSdcard(String path, String fileName) { 	if ("".equals(path) || path == null) { 		result += "path is null or ''" + "/n"; 		mTv.post(new Runnable(){				@Override				public void run() {					mTv.setText(result);				} 		}); 		return; 	}  	String str = "sangfor";		File sdDire = Environment.getExternalStorageDirectory();		FileOutputStream outFileStream;		try {			outFileStream = new FileOutputStream(path + File.separator + fileName);			outFileStream.write(str.getBytes());			outFileStream.close();     			Toast.makeText(MainActivity.this, fileName +"文件保存成功", Toast.LENGTH_LONG).show(); 		} catch (Exception e) {			e.printStackTrace();			result += "save " + fileName +"fail" + "/n";			mTv.post(new Runnable(){				@Override				public void run() {					mTv.setText(result);				} 		});			Log.e(TAG, "save file fail");		}  }}