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我正在为我的应用程序进行更新，我刚刚添加了另一个 tabhost，但我不断收到错误。第一个 tabhost 活动扩展了 TabActivity。我试图用第二个来做到这一点，但它没有用，所以我回到扩展活动。然后我开始遇到其他错误。我正在查看 logcat，其中一个错误是指我的第一个 tabhost 活动，所以我对此有点困惑。我不知道该怎么做。

继承人logcat

06-04 15:50:52.814: E/AndroidRuntime(23237): FATAL EXCEPTION: main
06-04 15:50:52.814: E/AndroidRuntime(23237): java.lang.RuntimeException: Unable to      start activity      ComponentInfo{com.TBJsoft.enclosurecalculator/tbjsoft.enclosurecalculator.DiagramTabHost}:   java.lang.NullPointerException
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.os.Looper.loop(Looper.java:137)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread.main(ActivityThread.java:5041)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at java.lang.reflect.Method.invokeNative(Native Method)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at java.lang.reflect.Method.invoke(Method.java:511)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at dalvik.system.NativeStart.main(Native Method)
06-04 15:50:52.814: E/AndroidRuntime(23237): Caused by: java.lang.NullPointerException
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.widget.TabHost.addTab(TabHost.java:236)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at tbjsoft.enclosurecalculator.DiagramTabHost.onCreate(DiagramTabHost.java:37)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.Activity.performCreate(Activity.java:5104)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
06-04 15:50:52.814: E/AndroidRuntime(23237):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
06-04 15:50:52.814: E/AndroidRuntime(23237):    ... 11 more

这是第一个标签主机

    protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tab_host);
    build();
}

public void build(){
    vas = getIntent().getDoubleExtra("vas",0);
    fs = getIntent().getDoubleExtra("fs",0);
    qts = getIntent().getDoubleExtra("qts",0);
    qes = getIntent().getDoubleExtra("qes",0);
    slotWidth = getIntent().getDoubleExtra("slotWidth",0);
    slotHeight = getIntent().getDoubleExtra("slotHeight",0);
    portDiameter = getIntent().getDoubleExtra("portDiameter",0);
    sVolume = getIntent().getDoubleExtra("sealedVolume",0);
    pVolume = getIntent().getDoubleExtra("portedVolume",0);
    fb = getIntent().getDoubleExtra("fb", 0);

    tabHost = getTabHost();

    spec = tabHost.newTabSpec("Specs");
    spec.setIndicator("Specs");
    Intent calculate = new Intent(this, Calculate.class);
    calculate.putExtra("vas", vas);
    calculate.putExtra("fs", fs);
    calculate.putExtra("qts", qts);
    calculate.putExtra("qes", qes);
    calculate.putExtra("slotWidth", slotWidth);
    calculate.putExtra("slotHeight", slotHeight);
    calculate.putExtra("portDiameter", portDiameter);
    spec.setContent(calculate);

    dimensions = tabHost.newTabSpec("Dimensions");
    dimensions.setIndicator("Dimensions");
    Intent dimension = new Intent(this,BoxDimensions.class);
    dimension.putExtra("sVolume",sVolume);
    dimension.putExtra("pVolume",pVolume);
    dimensions.setContent(dimension);

    ports = tabHost.newTabSpec("Ports");
    ports.setIndicator("Ports");
    Intent port = new Intent(this, Ports.class);
    port.putExtra("fb", fb);
    port.putExtra("pVolume", pVolume);
    ports.setContent(port);

    tabHost.addTab(spec);
    tabHost.addTab(dimensions);
    tabHost.addTab(ports);

}

}

这是第二个

protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_diagram_tab_host);
    tabHost = (android.widget.TabHost) findViewById(R.id.wdTabHost);
    in = getIntent().getStringArrayListExtra("imageName");

    if(in.get(4).equals("1")){

        String imageName = in.get(0) + in.get(1) + in.get(2) + in.get(3) + in.get(4);

        diagram = tabHost.newTabSpec("Diagram");
        diagram.setIndicator("Diagram");
        Intent d = new Intent(DiagramTabHost.this, Diagram.class);
        d.putExtra("imageName",imageName);
        diagram.setContent(d);

        tabHost.addTab(diagram);

    }else{

        String imageName = in.get(0) + in.get(1) + in.get(2) + in.get(3) + in.get(4);

        parallel = tabHost.newTabSpec("Parallel");
        parallel.setIndicator("Parallel");
        Intent p = new Intent(DiagramTabHost.this, Parallel.class);
        p.putExtra("imageName",imageName);
        parallel.setContent(p);

        series = tabHost.newTabSpec("Series");
        series.setIndicator("Series");
        Intent s = new Intent(DiagramTabHost.this, Series.class);
        s.putExtra("imageName",imageName);
        series.setContent(s);

        tabHost.addTab(parallel);
        tabHost.addTab(series);
    }
}
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2 回答 2

0

我尝试在我的应用程序 ["Droid Bones"] 中执行此操作，但没有成功。如果您在 android 设备中安装“Droid Bones”，您可以看到我的解决方法结构。

于 2013-06-04T22:44:35.050 回答
0

我相信问题是setup()如果使用findViewById().

tabHost = (android.widget.TabHost) findViewById(R.id.wdTabHost);
tabHost.setup();

我基本上是直接从文档中引用的。

于 2013-06-04T20:05:52.253 回答