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");
} 
}
}