{"id":300,"date":"2013-11-26T08:11:22","date_gmt":"2013-11-26T00:11:22","guid":{"rendered":"http:\/\/www.menglanglang.cn\/?p=300"},"modified":"2013-11-26T10:44:02","modified_gmt":"2013-11-26T02:44:02","slug":"android%e4%b8%ad%e6%96%87%e4%bb%b6%e8%af%bb%e5%86%99%e7%9a%84demo","status":"publish","type":"post","link":"http:\/\/www.menglanglang.cn\/?p=300","title":{"rendered":"Android\u4e2d\u6587\u4ef6\u8bfb\u5199\u7684Demo"},"content":{"rendered":"

\u8fd9\u662f\u4e00\u4e2aAndroid\u5e73\u53f0\u7684\u5c0f\u5e94\u7528\uff0c\u4e3b\u8981\u5b9e\u73b0\u4e86SD\u5361\u4e0a\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c\uff0c\u901a\u8fc7IO\u6d41\u6765\u5b9e\u73b0\u3002<\/span><\/p>\n

MainActivity.java<\/strong><\/p>\n

\n
<\/div>\n
    \n
  1. package<\/span>\u00a0com.landroid.files;\u00a0\u00a0<\/span><\/span><\/li>\n
  2. \u00a0\u00a0<\/span><\/li>\n
  3. import<\/span>\u00a0com.landroid.files.R;\u00a0\u00a0<\/span><\/span><\/li>\n
  4. import<\/span>\u00a0com.landroid.service.FileService;\u00a0\u00a0<\/span><\/span><\/li>\n
  5. \u00a0\u00a0<\/span><\/li>\n
  6. import<\/span>\u00a0android.app.Activity;\u00a0\u00a0<\/span><\/span><\/li>\n
  7. import<\/span>\u00a0android.os.Bundle;\u00a0\u00a0<\/span><\/span><\/li>\n
  8. import<\/span>\u00a0android.view.View;\u00a0\u00a0<\/span><\/span><\/li>\n
  9. import<\/span>\u00a0android.view.View.OnClickListener;\u00a0\u00a0<\/span><\/span><\/li>\n
  10. import<\/span>\u00a0android.widget.Button;\u00a0\u00a0<\/span><\/span><\/li>\n
  11. import<\/span>\u00a0android.widget.EditText;\u00a0\u00a0<\/span><\/span><\/li>\n
  12. import<\/span>\u00a0android.widget.Toast;\u00a0\u00a0<\/span><\/span><\/li>\n
  13. \u00a0\u00a0<\/span><\/li>\n
  14. public<\/span>\u00a0<\/span>class<\/span>\u00a0MainActivity\u00a0<\/span>extends<\/span>\u00a0Activity\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  15. \u00a0\u00a0\u00a0\u00a0\/**\u00a0Called\u00a0when\u00a0the\u00a0activity\u00a0is\u00a0first\u00a0created.\u00a0*\/<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  16. \u00a0\u00a0\u00a0\u00a0@Override<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
  17. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>void<\/span>\u00a0onCreate(Bundle\u00a0savedInstanceState)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  18. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super<\/span>.onCreate(savedInstanceState);\u00a0\u00a0<\/span><\/span><\/li>\n
  19. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0setContentView(R.layout.main);\u00a0\u00a0<\/span><\/li>\n
  20. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Button\u00a0button\u00a0=\u00a0(Button)\u00a0this<\/span>.findViewById(R.id.button);\u00a0\u00a0<\/span><\/span><\/li>\n
  21. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0button.setOnClickListener(new<\/span>\u00a0ButtonOnClickListener());\u00a0\u00a0<\/span><\/span><\/li>\n
  22. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  23. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/li>\n
  24. \u00a0\u00a0\u00a0\u00a0private<\/span>\u00a0<\/span>final<\/span>\u00a0<\/span>class<\/span>\u00a0ButtonOnClickListener\u00a0<\/span>implements<\/span>\u00a0OnClickListener\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  25. \u00a0\u00a0<\/span><\/li>\n
  26. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>void<\/span>\u00a0onClick(View\u00a0v)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  27. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0EditText\u00a0filenameText\u00a0=\u00a0(EditText)\u00a0findViewById(R.id.filename);\u00a0\u00a0<\/span><\/li>\n
  28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0EditText\u00a0filecontentText\u00a0=\u00a0(EditText)\u00a0findViewById(R.id.filecontent);\u00a0\u00a0<\/span><\/li>\n
  29. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0String\u00a0filename\u00a0=\u00a0filenameText.getText().toString();\u00a0\u00a0<\/span><\/li>\n
  30. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0String\u00a0filecontent\u00a0=\u00a0filecontentText.getText().toString();\u00a0\u00a0<\/span><\/li>\n
  31. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileService\u00a0service\u00a0=\u00a0new<\/span>\u00a0FileService(getApplicationContext());\u00a0\u00a0<\/span><\/span><\/li>\n
  32. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0try<\/span>\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  33. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0service.save(filename,\u00a0filecontent);\u00a0\u00a0<\/span><\/li>\n
  34. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Toast.makeText(getApplicationContext(),\u00a0R.string.success,\u00a01<\/span>).show();\u00a0\u00a0<\/span><\/span><\/li>\n
  35. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0catch<\/span>\u00a0(Exception\u00a0e)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
  36. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Toast.makeText(getApplicationContext(),\u00a0R.string.fail,\u00a01<\/span>).show();\u00a0\u00a0<\/span><\/span><\/li>\n
  37. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0e.printStackTrace();\u00a0\u00a0<\/span><\/li>\n
  38. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  39. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  40. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/li>\n
  41. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
  42. }\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

     <\/p>\n

    FileService.java<\/strong><\/p>\n

    \n
    <\/div>\n
      \n
    1. package<\/span>\u00a0com.landroid.service;\u00a0\u00a0<\/span><\/span><\/li>\n
    2. \u00a0\u00a0<\/span><\/li>\n
    3. import<\/span>\u00a0java.io.ByteArrayOutputStream;\u00a0\u00a0<\/span><\/span><\/li>\n
    4. import<\/span>\u00a0java.io.FileInputStream;\u00a0\u00a0<\/span><\/span><\/li>\n
    5. import<\/span>\u00a0java.io.FileNotFoundException;\u00a0\u00a0<\/span><\/span><\/li>\n
    6. import<\/span>\u00a0java.io.FileOutputStream;\u00a0\u00a0<\/span><\/span><\/li>\n
    7. \u00a0\u00a0<\/span><\/li>\n
    8. import<\/span>\u00a0android.content.Context;\u00a0\u00a0<\/span><\/span><\/li>\n
    9. \u00a0\u00a0<\/span><\/li>\n
    10. public<\/span>\u00a0<\/span>class<\/span>\u00a0FileService\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    11. \u00a0\u00a0\u00a0\u00a0private<\/span>\u00a0Context\u00a0context;\u00a0\u00a0<\/span><\/span><\/li>\n
    12. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0FileService(Context\u00a0context)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    13. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this<\/span>.context\u00a0=\u00a0context;\u00a0\u00a0<\/span><\/span><\/li>\n
    14. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    15. \u00a0\u00a0<\/span><\/li>\n
    16. \u00a0\u00a0\u00a0\u00a0\/**<\/span>\u00a0<\/span><\/li>\n
    17. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u4fdd\u5b58\u6587\u4ef6<\/span>\u00a0<\/span><\/li>\n
    18. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0@param\u00a0filename\u00a0\u6587\u4ef6\u540d\u79f0<\/span>\u00a0<\/span><\/li>\n
    19. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0@param\u00a0filecontent\u00a0\u6587\u4ef6\u5185\u5bb9<\/span>\u00a0<\/span><\/li>\n
    20. \u00a0\u00a0\u00a0\u00a0\u00a0*\/<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
    21. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0<\/span>void<\/span>\u00a0save(String\u00a0filename,\u00a0String\u00a0filecontent)\u00a0<\/span>throws<\/span>\u00a0Exception\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    22. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u79c1\u6709\u64cd\u4f5c\u6a21\u5f0f\uff1a\u521b\u5efa\u51fa\u6765\u7684\u6587\u4ef6\u53ea\u80fd\u88ab\u672c\u5e94\u7528\u8bbf\u95ee\uff0c\u5176\u5b83\u5e94\u7528\u65e0\u6cd5\u8bbf\u95ee\u8be5\u6587\u4ef6<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
    23. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u53e6\u5916\u91c7\u7528\u79c1\u6709\u64cd\u4f5c\u6a21\u5f0f\u521b\u5efa\u7684\u6587\u4ef6\uff0c\u5199\u5165\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u4f1a\u8986\u76d6\u6e90\u6587\u4ef6\u7684\u5185\u5bb9<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
    24. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileOutputStream\u00a0outStream\u00a0=\u00a0context.openFileOutput(filename,\u00a0Context.MODE_PRIVATE);\u00a0\u00a0<\/span><\/li>\n
    25. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0outStream.write(filecontent.getBytes());\u00a0\u00a0<\/span><\/li>\n
    26. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0outStream.close();\u00a0\u00a0<\/span><\/li>\n
    27. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    28. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/li>\n
    29. \u00a0\u00a0\u00a0\u00a0\/**<\/span>\u00a0<\/span><\/li>\n
    30. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/span>\u00a0<\/span><\/li>\n
    31. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0@param\u00a0filename\u00a0\u6587\u4ef6\u540d\u79f0<\/span>\u00a0<\/span><\/li>\n
    32. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0@return\u00a0\u6587\u4ef6\u5185\u5bb9<\/span>\u00a0<\/span><\/li>\n
    33. \u00a0\u00a0\u00a0\u00a0\u00a0*\u00a0@throws\u00a0Exception<\/span>\u00a0<\/span><\/li>\n
    34. \u00a0\u00a0\u00a0\u00a0\u00a0*\/<\/span>\u00a0\u00a0<\/span><\/span><\/li>\n
    35. \u00a0\u00a0\u00a0\u00a0public<\/span>\u00a0String\u00a0read(String\u00a0filename)\u00a0<\/span>throws<\/span>\u00a0Exception\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    36. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileInputStream\u00a0inStream\u00a0=\u00a0context.openFileInput(filename);\u00a0\u00a0<\/span><\/li>\n
    37. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0byte<\/span>[]\u00a0buffer\u00a0=\u00a0<\/span>new<\/span>\u00a0<\/span>byte<\/span>[<\/span>1024<\/span>];\u00a0\u00a0<\/span><\/span><\/li>\n
    38. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ByteArrayOutputStream\u00a0outStream\u00a0=\u00a0new<\/span>\u00a0ByteArrayOutputStream();\u00a0\u00a0<\/span><\/span><\/li>\n
    39. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int<\/span>\u00a0len\u00a0=\u00a0<\/span>0<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    40. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while<\/span>((len\u00a0=\u00a0inStream.read(buffer))\u00a0!=\u00a0-<\/span>1<\/span>)\u00a0{\u00a0\u00a0<\/span><\/span><\/li>\n
    41. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0outStream.write(buffer,\u00a00<\/span>,\u00a0len);\u00a0\u00a0<\/span><\/span><\/li>\n
    42. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    43. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0byte<\/span>[]\u00a0data\u00a0=\u00a0outStream.toByteArray();\u00a0\u00a0<\/span><\/span><\/li>\n
    44. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0new<\/span>\u00a0String(data);\u00a0\u00a0<\/span><\/span><\/li>\n
    45. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return<\/span>\u00a0<\/span>null<\/span>;\u00a0\u00a0<\/span><\/span><\/li>\n
    46. \u00a0\u00a0\u00a0\u00a0}\u00a0\u00a0<\/span><\/li>\n
    47. \u00a0\u00a0<\/span><\/li>\n
    48. }\u00a0\u00a0<\/span><\/li>\n<\/ol>\n<\/div>\n

       <\/p>\n","protected":false},"excerpt":{"rendered":"

      \u8fd9\u662f\u4e00\u4e2aAndroid\u5e73\u53f0\u7684\u5c0f\u5e94\u7528\uff0c\u4e3b\u8981\u5b9e\u73b0\u4e86SD\u5361\u4e0a\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c\uff0c\u901a\u8fc7IO\u6d41\u6765\u5b9e\u73b0\u3002 MainActivi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[599,109,110],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-android","tag-android","tag-demo","tag-110"],"_links":{"self":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=300"}],"version-history":[{"count":0,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=\/wp\/v2\/posts\/300\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.menglanglang.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}