创造sd文件并读取

创建sd文件并读取

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.widget.TextView;/** * This activity shows how to write and read data from sdcard * @author FaYnaSoft Labs * */public class Main extends Activity {private static final String APP_TAG = "tag";private TextView readOutput;@Overridepublic void onCreate(final Bundle icicle) {super.onCreate(icicle);this.setContentView(R.layout.main);readOutput = (TextView) findViewById(R.id.output);String fileName = "test-" + System.currentTimeMillis() + ".txt";// create /sdcard/test_folderFile sdDir = new File(Environment.getExternalStorageDirectory().getPath());if (sdDir.exists() && sdDir.canWrite()) {File testDir = new File(sdDir.getAbsolutePath() + "/test_folder");testDir.mkdir();if (testDir.exists() && testDir.canWrite()) {File file = new File(testDir.getAbsolutePath() + "/" + fileName);try {file.createNewFile();} catch (IOException e) {Log.e(APP_TAG, "error creating file", e);}if (file.exists() && file.canWrite()) {FileOutputStream fos = null;try {fos = new FileOutputStream(file);fos.write("Hello, World!".getBytes());} catch (FileNotFoundException e) {Log.e(APP_TAG, "ERROR", e);} catch (IOException e) {Log.e(APP_TAG, "ERROR", e);} finally {if (fos != null) {try {fos.flush();fos.close();} catch (IOException e) {}}}} else {Log.e(APP_TAG, "error writing to file");}} else {Log.e(APP_TAG, "ERROR, unable to write to /sdcard/test_folder");}} else {Log.e(APP_TAG, "ERROR, /sdcard path not available");}// Read file blockFile readFile = new File(sdDir.getPath() + "/test_folder/" + fileName);if (readFile.exists() && readFile.canRead()) {FileInputStream fis = null;try {fis = new FileInputStream(readFile);byte[] reader = new byte[fis.available()];while (fis.read(reader) != -1) {}readOutput.setText(new String(reader));} catch (IOException e) {Log.e(APP_TAG, e.getMessage(), e);} finally {if (fis != null) {try {fis.close();} catch (IOException e) {}}}} else {readOutput.setText("Unable to read/write sdcard file, see logcat output");}}}

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