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Infernal
Asked:2020-11-12 18:49:28 +0000 UTC2020-11-12 18:49:28 +0000 UTC

单击按钮时应用程序崩溃

  • 772

我编写了一个应用程序，显示有关电话运营商、网络类型等的信息。按下按钮后，它崩溃了。下面是程序代码和日志。

public class MainActivity extends AppCompatActivity {

    TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv = (TextView)findViewById(R.id.info);
    }

    public void onSubmit(View v) {
        TelephonyManager tm=(TelephonyManager)getSystemService(Context.TELECOM_SERVICE);
        int callstate=tm.getCallState();
        String callstat="";
        switch(callstate){
            case TelephonyManager.CALL_STATE_IDLE:
                callstat="Call State: Phone is idle\n";
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                callstat="Call State: Phone is in use\n";
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                callstat="Call State: Phone is ringing\n";
                break;
        }
        String opname="\n Operator ID:"+""+tm.getNetworkOperator();
        opname=opname+"\n Operator Name:"+""+tm.getNetworkOperatorName();
        int phoneType=tm.getPhoneType();
        String ptype="";
        switch (phoneType){
            case TelephonyManager.PHONE_TYPE_CDMA:
                ptype="\nPhone Type: CDMA";
                break;
            case TelephonyManager.PHONE_TYPE_GSM:
                ptype="\nPhone Type: GSM";
                break;
            case TelephonyManager.PHONE_TYPE_SIP:
                ptype="\nPhone Type: SIP";
                break;
            case TelephonyManager.PHONE_TYPE_NONE:
                ptype="\nPhone Type: NONE";
                break;
        }
        boolean isRoaming=tm.isNetworkRoaming();
        String pDetails="";
        if (isRoaming){
            pDetails="Roaming : Yes\n";
        }
        else {
            pDetails="Roaming : No\n";
        }
        tv.setText(callstat+opname+ptype+pDetails);
    }
}

日志猫：

5527) 在 java.lang.reflect.Method.invoke(Native Method) 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739) 在 com.android.internal.os.ZygoteInit.main( ZygoteInit.java:629) 11-12 14:44:42.531 25260-25260/com.galaxy.operator E/MQSEventManagerDelegate: 获取 MQSService 失败。11-12 14:44:42.547 25260-25260/? I/Process：发送信号。PID：25260 SIG：9 739) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629) 11-12 14:44:42.531 25260-25260/com.galaxy.operator E/MQSEventManagerDelegate: 未能获得 MQSService。11-12 14:44:42.547 25260-25260/? I/Process：发送信号。PID：25260 SIG：9 739) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:629) 11-12 14:44:42.531 25260-25260/com.galaxy.operator E/MQSEventManagerDelegate: 未能获得 MQSService。11-12 14:44:42.547 25260-25260/? I/Process：发送信号。PID：25260 SIG：9

我在清单中提供了以下权限：

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
java

1 个回答

  1. Best Answer

    代替它

    TelephonyManager tm= (TelephonyManager) getSystemService(Context.TELECOM_SERVICE);

    对此：

    TelephonyManager tm=(TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
    • 4

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