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我正在构建一个使用 tabs 实现 Bluetooth、Wifi、Phone call 和 Sms 的应用程序。MainActivity.java 文件如下所示。

package com.example.servicesdemo;

import android.os.Bundle;
import android.app.Activity;
import android.app.TabActivity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
import android.support.v4.app.NavUtils;

public class MainActivity extends TabActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TabHost tabHost = getTabHost();

    TabSpec btspec = tabHost.newTabSpec("Bluetooth");
    btspec.setIndicator("Bluetooth");
    Intent btIntent = new Intent(getBaseContext() , BtActivity.class);
    btspec.setContent(btIntent);

    TabSpec wifispec = tabHost.newTabSpec("Wifi");
    wifispec.setIndicator("Wifi");
    Intent wifiIntent = new Intent(getBaseContext(),WifiActivity.class);
    wifispec.setContent(wifiIntent);

    TabSpec callspec = tabHost.newTabSpec("Phone Call");
    callspec.setIndicator("Phone Call");
    Intent callIntent = new Intent(getBaseContext(),CallActivity.class);
    wifispec.setContent(callIntent);

    TabSpec smsspec = tabHost.newTabSpec("SMS");
    wifispec.setIndicator("SMS");
    Intent smsIntent = new Intent(getBaseContext(),SmsActivity.class);
    smsspec.setContent(smsIntent);

    tabHost.addTab(btspec);
    tabHost.addTab(wifispec);
    tabHost.addTab(callspec);

    tabHost.addTab(smsspec);
    tabHost.setCurrentTab(0);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}


}

我创建了 4 个 XML 文件和 4 个 Activity 文件（上面提到的每个服务一个）。例如，我为蓝牙选项卡创建了一个 BtActivity.java 文件，如下所示（稍后我将编写更多代码）。

BtActivity.java

package com.example.servicesdemo;

import android.app.Activity;
import android.os.Bundle;

public class BtActivity extends Activity{
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.bt_layout);
}

}

现在，当我尝试运行应用程序时，它只会崩溃。LogCat 错误如下所示。

     08-29 10:44:33.810: D/AndroidRuntime(369): Shutting down VM
08-29 10:44:33.810: W/dalvikvm(369): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-29 10:44:33.830: E/AndroidRuntime(369): FATAL EXCEPTION: main
08-29 10:44:33.830: E/AndroidRuntime(369): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.servicesdemo/com.example.servicesdemo.MainActivity}: java.lang.IllegalArgumentException: you must specify a way to create the tab content
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.os.Looper.loop(Looper.java:130)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-29 10:44:33.830: E/AndroidRuntime(369):  at java.lang.reflect.Method.invokeNative(Native Method)
08-29 10:44:33.830: E/AndroidRuntime(369):  at java.lang.reflect.Method.invoke(Method.java:507)
08-29 10:44:33.830: E/AndroidRuntime(369):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-29 10:44:33.830: E/AndroidRuntime(369):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-29 10:44:33.830: E/AndroidRuntime(369):  at dalvik.system.NativeStart.main(Native Method)
08-29 10:44:33.830: E/AndroidRuntime(369): Caused by: java.lang.IllegalArgumentException: you must specify a way to create the tab content
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.widget.TabHost.addTab(TabHost.java:202)
08-29 10:44:33.830: E/AndroidRuntime(369):  at com.example.servicesdemo.MainActivity.onCreate(MainActivity.java:43)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-29 10:44:33.830: E/AndroidRuntime(369):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-29 10:44:33.830: E/AndroidRuntime(369):  ... 11 more
08-29 10:49:53.781: D/AndroidRuntime(378): Shutting down VM
08-29 10:49:53.781: W/dalvikvm(378): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-29 10:49:53.790: E/AndroidRuntime(378): FATAL EXCEPTION: main
08-29 10:49:53.790: E/AndroidRuntime(378): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.servicesdemo/com.example.servicesdemo.MainActivity}: java.lang.IllegalArgumentException: you must specify a way to create the tab content
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.os.Looper.loop(Looper.java:130)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-29 10:49:53.790: E/AndroidRuntime(378):  at java.lang.reflect.Method.invokeNative(Native Method)
08-29 10:49:53.790: E/AndroidRuntime(378):  at java.lang.reflect.Method.invoke(Method.java:507)
08-29 10:49:53.790: E/AndroidRuntime(378):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-29 10:49:53.790: E/AndroidRuntime(378):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-29 10:49:53.790: E/AndroidRuntime(378):  at dalvik.system.NativeStart.main(Native Method)
08-29 10:49:53.790: E/AndroidRuntime(378): Caused by: java.lang.IllegalArgumentException: you must specify a way to create the tab content
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.widget.TabHost.addTab(TabHost.java:202)
08-29 10:49:53.790: E/AndroidRuntime(378):  at com.example.servicesdemo.MainActivity.onCreate(MainActivity.java:43)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-29 10:49:53.790: E/AndroidRuntime(378):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-29 10:49:53.790: E/AndroidRuntime(378):  ... 11 more
08-29 10:49:56.110: I/Process(378): Sending signal. PID: 378 SIG: 9

我之前遇到过类似的问题，但在那种情况下，我试图在选项卡中显示的一个类没有扩展 Activity 类（这是用户告诉我的）。

这是我上一个问题的链接以供参考。

但是现在，我已经使用了所有扩展 Activity 类的类，所以在运行时应该没有问题。请帮忙

4

1 回答 1

0

你已经使用了 wifispec.setContent(); 对于电话使用 callspec.setContent(callIntent); 等等

TabSpec callspec = tabHost.newTabSpec("Phone Call");
    **callspec.setIndicator("Phone Call");** 
    Intent callIntent = new Intent(getBaseContext(),CallActivity.class);
    **wifispec.setContent(callIntent);**  ---> callspec.setContent(callIntent);

    TabSpec smsspec = tabHost.newTabSpec("SMS");
    **wifispec.setIndicator("SMS");**  ---> smsspec.setIndicator("SMS");
    Intent smsIntent = new Intent(getBaseContext(),SmsActivity.class);
    **smsspec.setContent(smsIntent);**
于 2012-08-29T05:12:02.233 回答