文章目錄

• 一、報錯信息
• 二、解決方案

一、報錯信息

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2021-05-07 13:24:24.672 29512-29512/kim.hsl.a7_zip E/AndroidRuntime: FATAL EXCEPTION: mainProcess: kim.hsl.a7_zip, PID: 29512java.lang.RuntimeException: Unable to start activity ComponentInfo{kim.hsl.a7_zip/kim.hsl.a7_zip.MainActivity}: java.lang.IllegalThreadStateException: process hasn't exitedat android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2951)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086)at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816)at android.os.Handler.dispatchMessage(Handler.java:106)at android.os.Looper.loop(Looper.java:193)at android.app.ActivityThread.main(ActivityThread.java:6718)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)Caused by: java.lang.IllegalThreadStateException: process hasn't exitedat java.lang.UNIXProcess.exitValue(UNIXProcess.java:215)at kim.hsl.a7_zip.MainActivity.compress7z(MainActivity.kt:115)at kim.hsl.a7_zip.MainActivity.onCreate(MainActivity.kt:24)at android.app.Activity.performCreate(Activity.java:7144)at android.app.Activity.performCreate(Activity.java:7135)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2931)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3086) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1816) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6718) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

問題描述 : 使用 Runtime.getRuntime().exec(cmd) 執行命令 , 如果實時打印出命令執行的命令行信息 , 使用如下代碼 :

var process: Process = Runtime.getRuntime().exec(cmd)// 讀取命令執行過程數據var reader = BufferedReader(InputStreamReader(process.inputStream))while (true) {val line = reader.readLine()if (line != null) {Log.i(TAG, "$line")}else{break}}

執行完畢后 , 調用如下代碼查詢執行結果 , 報上述錯誤 ;

process.exitValue()

二、解決方案

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出現問題原因 : 讀取命令執行過程的 BufferedReader 沒有關閉 ;

正確用法 :

var process: Process = Runtime.getRuntime().exec(cmd)// 讀取命令執行過程數據var reader = BufferedReader(InputStreamReader(process.inputStream))while (true) {val line = reader.readLine()if (line != null) {Log.i(TAG, "$line")}else{break}}reader.close()val exitValue = process.exitValue()

使用 BufferedReader 讀取命令行執行過程 , 讀取完畢后 , 及時關閉 BufferedReader ;

總結

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