Android如何实现在进行文件读取的时候,停止文件读取,并清除已经读取到内存的文件
时间: 2023-05-25 21:03:27 浏览: 123
1. 停止文件读取:
在Android中,文件读取通常是通过InputStream类和FileReader类来实现的。如果想要停止文件读取,可以调用close()方法来关闭输入流对象,从而停止文件读取。
以下是示例代码:
```java
import java.io.*;
public class FileOperation {
private static final int BUFFER_SIZE = 1024;
public static void main(String[] args) {
File file = new File("test.txt");
InputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = 0;
while ((bytesRead = inputStream.read(buffer)) != -1) {
// 进行文件读取操作
// 如果需要停止文件读取,可以在此处加入判断语句
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (inputStream != null) {
inputStream.close(); // 关闭输入流对象,停止文件读取
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
```
2. 清除已经读取到内存的文件:
如果已经将文件读取到内存中,那么可以通过清空相应的缓存区来清除已经读取到内存中的文件内容。
以下是示例代码:
```java
import java.io.*;
public class FileOperation {
private static final int BUFFER_SIZE = 1024;
public static void main(String[] args) {
File file = new File("test.txt");
InputStream inputStream = null;
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = 0;
try {
inputStream = new FileInputStream(file);
while ((bytesRead = inputStream.read(buffer)) != -1) {
// 进行文件读取操作
}
buffer = null; // 清空缓存区,清除已经读取到内存中的文件
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
```
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