Question

嘿其他程序员＆lt; 3
我想通过broadcastReceiver将我的服务中的字符串数组传输到我的MainActivity 字符串数组包含在Intent中但是当我试图从我的意图中获取String []时然后它是一个对象数组，我不能只使用intent.getStringArrayExtra（String）然后我尝试了这个：

如何在Java中将对象数组转换为字符串数组？ String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);

但它仍然可以工作：/

public class MainActivity extends Activity implements View.OnClickListener {
final String LOG_TAG = "mainActivityLogs";
Button btnStartService;

private int numberOfFinishedTasks = 0;
private List<String> finishedTasksInTheLast60Sec = new ArrayList<>();
private int startedTasks = 0;
private ProgressBar pbService;
private Handler progressHandler = new Handler();

private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        //results in java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]
        finishedTasksInTheLast60Sec = Arrays.asList(intent.getStringArrayExtra("finishedTasks"));

        //results in java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]
        Object[] objectArray = intent.getStringArrayExtra("finishedTasks");
        String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);
        finishedTasksInTheLast60Sec = Arrays.asList(stringArray);

        numberOfFinishedTasks += finishedTasksInTheLast60Sec.size();
        for (String finishedTask : finishedTasksInTheLast60Sec) {
            Log.d(LOG_TAG, finishedTask);
        }
    }
};

此函数在Service文件MyService中，var finishedTasks只包含已关闭的Threads的名称：

   private void sendBroadcast(List<String> finishedTasks) {
   Intent intent = new Intent("myServiceUpdate");
   intent.putExtra("finishedTasks", finishedTasks.toArray());
   LocalBroadcastManager.getInstance(this).sendBroadcast(intent);
   }

我希望你能提供帮助，如果你需要整个代码，请发短信给我：）

Answer 1

发送时，将List类型转换为ArrayList类型：

intent.putStringArrayListExtra("finishedTasks",(ArrayList<String>)finishedTasks);

接收时只需通过以下方式获取数据：

 List stringList = getIntent().getStringArrayListExtra("finishedTasks");

Android ClassCastException Object [] to String []

1 个答案: