我想知道如何讀取內部存儲器中某些文件的值，但這些文件不在“/data/data/myapp/files”文件夾中，它們位于“/dev/”和“/”文件夾中sys/class”文件夾。import...public class Calentando extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate( savedInstanceState ); getWindow().setFlags( WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN ); setContentView( R.layout.activity_calentando ); @RequiresApi(api = Build.VERSION_CODES.KITKAT) private byte[] readFile(String path) { File file = new File( "/sys/class/gpio/gpio33/value" ); try (FileInputStream fis = new FileInputStream( file ); BufferedInputStream bis = new BufferedInputStream( fis )) { byte[] buffer = new byte[4096]; int bytesRead; ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((bytesRead = bis.read( buffer )) != -1) { baos.write( buffer, 0, bytesRead ); TextView Tempview = (TextView) findViewById( R.id.temperatura ); Tempview.setText( new String( readFile( path ), Charset.forName( "UTF-8" ) ) ); } return baos.toByteArray(); } catch (IOException e) { // handle the exception return null; } }}
1 回答
GCT1015
TA貢獻1827條經驗 獲得超4個贊
由于您的應用程序具有 root 權限，您可能能夠訪問/dev和/sys/class目錄。
您可以列出目錄內容：
new File(path).listFiles();
您可以讀取二進制文件內容：
private byte[] readFile(String path) {
File file = new File(path);
try (FileInputStream fis = new FileInputStream(file);
BufferedInputStream bis = new BufferedInputStream(fis)) {
byte[] buffer = new byte[4096];
int bytesRead;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while ((bytesRead = bis.read(buffer)) != -1) {
baos.write(buffer, 0, bytesRead);
}
return baos.toByteArray();
} catch (IOException e) {
// handle the exception
return null;
}
}
您可以在 a 中設置文件內容TextView（前提是它是文本文件）：
TextView Tempview;
Tempview = (TextView) findViewById( R.id.temperatura );
Tempview.setText(new String(readFile(path), Charset.forName("UTF-8")));
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