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我想在祝酒词中显示哪个网络连接可用。但是当我启动我的应用程序时，它会向我显示布局，但它不会让我敬酒。我是不是忘记了什么？

// 现在我每秒显示一个 toast。它从正确的开始，然后转到下一个。我现在还有一个按钮，它在文本视图中显示网络类型。但它总是只显示4g ..提前感谢您的帮助！

Button start;
TextView ergebniss;

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

    start = (Button)findViewById(R.id.start);
    start.setOnClickListener(this);

    ergebniss = (TextView) findViewById(R.id.textView1);

}


public void getNetworkClass(Context context) {
    TelephonyManager mTelephonyManager = (TelephonyManager) context
            .getSystemService(Context.TELEPHONY_SERVICE);
    int networkType = mTelephonyManager.getNetworkType();
    switch (networkType) {

    case TelephonyManager.NETWORK_TYPE_GPRS:
    case TelephonyManager.NETWORK_TYPE_EDGE:
    case TelephonyManager.NETWORK_TYPE_CDMA:
    case TelephonyManager.NETWORK_TYPE_1xRTT:
    case TelephonyManager.NETWORK_TYPE_IDEN:
    Toast.makeText(getApplicationContext(), "2G", Toast.LENGTH_LONG).show();
        ergebniss.setText("2G");


    case TelephonyManager.NETWORK_TYPE_UMTS:
    case TelephonyManager.NETWORK_TYPE_EVDO_0:
    case TelephonyManager.NETWORK_TYPE_EVDO_A:
    case TelephonyManager.NETWORK_TYPE_HSDPA:
    case TelephonyManager.NETWORK_TYPE_HSUPA:
    case TelephonyManager.NETWORK_TYPE_HSPA:
    case TelephonyManager.NETWORK_TYPE_EVDO_B:
    case TelephonyManager.NETWORK_TYPE_EHRPD:
    case TelephonyManager.NETWORK_TYPE_HSPAP:
        Toast.makeText(getApplicationContext(), "3G", Toast.LENGTH_LONG).show();
        ergebniss.setText("3G");


    case TelephonyManager.NETWORK_TYPE_LTE:
        Toast.makeText(getApplicationContext(), "4G", Toast.LENGTH_LONG).show();
        ergebniss.setText("4G");


    }

}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    getNetworkClass(this);
}

}

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1 回答 1

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你至少需要展示 Toast。

Toast.makeText(getApplicationContext(), "2G", Toast.LENGTH_LONG).show();

而且您在通话break;后缺少（或返回..）语句。Toast.makeText()

于 2014-09-10T13:48:04.650 回答