Android编程权威指南（第4版）第16章使用Intent调用相机闪退问题

原创已于 2022-11-10 22:13:12 修改 · 2.9k 阅读

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于 2022-04-17 10:26:38 首次发布

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此篇博客讲述了在Android相机模块Logout过程中遇到的NullPointerException，具体表现为尝试获取null数组长度，解决方法是在AndroidManifest.xml中添加READ_EXTERNAL_STORAGE权限。

在Logout中搜索camera出现以下错误

2022-04-17 09:06:17.753 25405-25405/com.android.camera2 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.android.camera2, PID: 25405
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.camera2/com.android.camera.CaptureActivity}: java.lang.NullPointerException: Attempt to get length of null array
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.NullPointerException: Attempt to get length of null array
        at com.android.camera.CameraActivity.shouldUseNoOpLocation(CameraActivity.java:1753)
        at com.android.camera.CameraActivity.onCreateTasks(CameraActivity.java:1438)
        at com.android.camera.util.QuickActivity.onCreate(QuickActivity.java:114)
        at android.app.Activity.performCreate(Activity.java:7802)
        at android.app.Activity.performCreate(Activity.java:7791)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)

需要在AndroidManifest.xml中添加获取储存卡的权限

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

赋予应用使用存储权限