Android 错误 - 打开失败 ENOENT

Question

我正在尝试使用一个整数数组来保存一些块覆盖率，它只是保存一个块被执行的次数。但是，出于某种原因，当我尝试写入我创建的一些文件时（例如“BlockForHelper.txt”，我专门在 Eclipse 中制作并放置在项目目录中），我收到此错误：

java.io.FileNotFoundException:  /nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.FileOutputStream.<init>(FileOutputStream.java:88)
at java.io.FileOutputStream.<init>(FileOutputStream.java:73)
at com.example.sql2.SQLTest.blockCoverage(SQLTest.java:149)
at com.example.sql2.test.SQLTestCase.testSuite(SQLTestCase.java:41)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:190)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:175)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1584)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 18 more

并给我错误：

public void blockCoverage() throws IOException
{
    String coverage = "";
    for (int x = 0; x < 20; x++)
        coverage += x + " " + bb_count[x] + "\n";

    File file = new File("/nfs/guille/groce/users/nicholsk/workspace3/SQLTest/BlockForTest.txt");
    Writer out = new OutputStreamWriter(new FileOutputStream(file)); // Here
    try
    {
        out.write(coverage);
    } finally {
        out.close();
    }
}

有人知道是什么原因造成的吗？

Answer 1

使用sdk，您不能写入内部存储的根目录。这会导致你的错误。

根据您的代码，将内部存储与 sdk 一起使用：

final File dir = new File(context.getFilesDir() + "/nfs/guille/groce/users/nicholsk/workspace3/SQLTest");
dir.mkdirs(); //create folders where write files
final File file = new File(dir, "BlockForTest.txt");

Answer 2

将文本文件放在assets目录下。如果没有资产目录，请在项目的根目录中创建一个。然后你可以使用

Context.getAssets().open("BlockForTest.txt");

打开这个文件的流。