Question

我无法弄清楚创建新文件时出了什么问题，我已经测试了以下代码并且工作正常，但在当前项目中我无法创建新文件。

创建文件：

public static File createFile() {
    final String SDCARD = Environment.getExternalStorageDirectory().getPath();
    final String TEMP_FOLDER = SDCARD + File.separator + "AVL1" + File.separator + "temp";
    final String name = "myfile3.png";
    final File directory = new File(TEMP_FOLDER);
    File tst = null;
    try {
        tst = new File(TEMP_FOLDER, name);
        if (tst.exists())
            return tst;

        if (directory.exists()) {
            Log.i("fdbg", "directory exists");
            tst.createNewFile();
        } else {
            Log.i("fdbg", "directory not exists");
            directory.mkdirs();
            tst.createNewFile();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return tst;
}

例外：

10-04 16:21:02.995 9533-9533/app.name W/System.err: java.io.IOException: open failed: EACCES (Permission denied)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at java.io.File.createNewFile(File.java:941)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at app.name.Views.Activities.MainActivity.createTempFile(MainActivity.java:290)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at app.name.Views.Activities.MainActivity.onCreate(MainActivity.java:149)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.Activity.performCreate(Activity.java:6221)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2611)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2723)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.ActivityThread.access$900(ActivityThread.java:172)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1422)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.os.Looper.loop(Looper.java:145)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:5832)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at java.lang.reflect.Method.invoke(Method.java:372)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
10-04 16:21:02.995 9533-9533/app.name W/System.err: Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at libcore.io.Posix.open(Native Method)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     at java.io.File.createNewFile(File.java:934)
10-04 16:21:02.995 9533-9533/app.name W/System.err:     ... 15 more

App build.gradle

apply plugin: 'com.android.application'
apply plugin: 'android-apt'

android {
    compileSdkVersion 24
    buildToolsVersion "24.0.2"

    defaultConfig {
        applicationId "package.name"
        minSdkVersion 19
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
        renderscriptTargetApi 21
        renderscriptSupportModeEnabled true
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
   //some repos
}

dependencies {
  //project dependencies
}
apply plugin: 'com.google.gms.google-services'

清单权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />


<application
        />

设备API = 21

Answer 1

我正在测试这是在Android 6.0上，如果是，那么你必须添加一些代码来授予这个权限

创建新文件时出现异常

1 个答案: