来源:https://blog.csdn.net/anjingshuai/article/details/84682779
开发过程中碰到将文件存储到手机中时,要先判断是否有sd卡,如下所示
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// 判断是否有SD卡
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private static boolean ExistSDCard() {
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if (android.os.Environment.getExternalStorageState().equals(
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android.os.Environment.MEDIA_MOUNTED)) {
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return true;
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} else
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return false;
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}
如果存在,则要获取sd卡的根目录路径,在目录下创建新的文件夹,sd卡根目录路径如下:
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public static String SDCARDPATH = Environment.getExternalStorageDirectory()
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.getPath();
然后是将要复制的文件写到sd卡下新建的文件夹内,代码如下:
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private void copyzipfileToLocalDir(final String path, final String filename) {
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File file = new File(path);
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if (file.exists()) {
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Uri uri = Uri.fromFile(file);
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Intent intent = new Intent(Intent.ACTION_VIEW, uri);
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intent.setClass(MainActivity.this, TestActivity.class);
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startActivity(intent);
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return;
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}
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pdlog = new ProgressDialog(this);
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pdlog.setMessage("正在复制文件...");
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pdlog.show();
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new Thread() {
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public void run() {
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try {
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InputStream input = getApplicationContext().getAssets()
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.open(filename);
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File f = new File(path);
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if (f.exists()) {
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return;
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}
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File file = f.getParentFile();
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// SDCARD/CN/ZNsql====================path
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if (!file.exists()) {
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file.mkdir();
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}
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FileOutputStream fout = new FileOutputStream(f);
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byte[] buff = new byte[1024];
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int len = 0;
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while ((len = input.read(buff)) > 0) {
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fout.write(buff, 0, len);
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}
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fout.close();
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input.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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handler.sendEmptyMessage(1);
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};
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}.start();
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}
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private Handler handler = new Handler() {
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public void handleMessage(android.os.Message msg) {
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switch (msg.what) {
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case 1:
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if (pdlog != null) {
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if (pdlog.isShowing()) {
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pdlog.cancel();
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}
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;
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}
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// jump
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File file = new File(SDCARDPATH+ "androidtest.pdf");
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if (file.exists()) {
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Uri uri = Uri.fromFile(file);
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Intent intent = new Intent(Intent.ACTION_VIEW, uri);
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intent.setClass(MainActivity.this, TestActivity.class);
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startActivity(intent);
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}
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break;
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default:
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break;
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}
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};
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};
这样就将assets下的文件写入了外置sd卡,对于一些不支持外置存储卡的Android手机,我们可以将文件写入机身内存,也就是俗称的ROM中,RomPath= Environment.getDataDirectory().getPath();当判断到没有外置sd卡时就可以把path换成这个RomPath即可,这样就完成了将文件写入机身内存中。