Question

我尝试了很多次，但实际上我正在创建一个设置页面，我的意思是设置按钮，在哪里处理打开和关闭在我从应用程序扩展的应用程序类中它向我展示了布尔引用null异常。以下是清单。

             <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:name=".ApplicationClass">
    <activity android:name=".SplashScr">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

这是java类。

public class ApplicationClass extends Application {
MyService.Reciver  rec;
private Context context;

public Boolean getSoundFX_State() {
    return soundFX_State;
}

public void setSoundFX_State(Boolean soundFX_State) {
    this.soundFX_State = soundFX_State;
}

Boolean soundFX_State;

@Override
public void onCreate()
{
super.onCreate();


regster();



  pndng();

    setSoundFX_State(true);
}

protected   void regster()
{
    try {
    rec=new MyService().new Reciver();
    if(soundFX_State==true) {

        registerReceiver(
                rec, new IntentFilter(
                        "android.intent.action.PHONE_STATE"));
        Toast.makeText(getBaseContext(), "Your call can disconect   automatically", Toast.LENGTH_SHORT)
                .show();


    }

和setting.java类。

    public class Setting extends Activity {

    MyService.Reciver  rec;
    private CheckBox c1,c2;
    protected  ApplicationClass app;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.setting);
        app=(ApplicationClass)getApplication();
        c1=(CheckBox)findViewById(R.id.checkBox);
        c2=(CheckBox)findViewById(R.id.checkBox2);
        rec=new MyService().new Reciver();
        if(app.getSoundFX_State())
        {
            c1.setChecked(true);
        }
        else {
            c1.setChecked(false);
        }

        c1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                if(isChecked) {

                    Toast.makeText(getBaseContext(), "c1", Toast.LENGTH_LONG).show();
                    app.setSoundFX_State(true);

                }
                else {
                    app.setSoundFX_State(false);
                    Toast.makeText(getBaseContext(),"off",Toast.LENGTH_SHORT).show();

                }
            }
        });
        c2.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                Toast.makeText(getBaseContext(),"c2",Toast.LENGTH_LONG).show();
            }
        });
        {

        };

    }



    public  void  chkboxclicked(View view)
    {

    }
}

Answer 1

1）更改

Boolean soundFX_State;

到

boolean soundFX_State;

<强> 2）

@Override
public void onCreate()
{
    super.onCreate();

   setSoundFX_State(true);

    regster();

    pndng();


}

希望这是有道理的。

Boolean show null引用异常

1 个答案: