Android API编程之Assets文件操作示例

public class ReadAssetActivity extends Activity {
  private TextView mTextView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.read_asset);
    initViews();
    readAssetsData();
    listAssetsFiles("fonts");// 列出文件目录
  }
  private void readAssetsData() {
    InputStream is = null;
    try {
      // 读取Assets文件夹下对应文件的输入流
      is = getAssets().open("asset_test.txt");
      // 获取文件输入流的总大小
      int size = is.available();
      // 把整个文件流放到一个Byte[]缓冲区
      byte[] buffer = new byte[size];
      is.read(buffer);
      is.close();
      // 将缓冲区数据转换为字符串
      String text = new String(buffer);
      mTextView.setText(text);
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (is != null) {
          is.close();
        }
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
  }
  private void initViews() {
    mTextView = (TextView) findViewById(R.id.text);
  }
  /**
   * 获取Assets下指定文件夹下文件数量 情况
   *
   * @description：
   * @author ldm
   * @date 2016-4-27 上午9:25:54
   */
  private void listAssetsFiles(String filePath) {
    AssetManager am = getAssets();
    String[] fileName;
    try {
      fileName = am.list(filePath);
      if (fileName.length > 0) {
        for (int i = 0; i < fileName.length; i++) {
          Log.e("ldm", String.format("在" + filePath
              + "中文件路下有:[%d] 文件数量", fileName.length));
        }
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}