SwitchPreference（pre ICS）的兼容性？

Question

在ICS兼容android-support-v4库中引入SwitchPreference？我试图更新一些旧的项目，如果可能的话，想使用SwitchPreferences。

我知道我可以制作一个单独的资源文件来区分API版本，但我想尽可能避免这种情况。

Answer 1

ICS中引入的SwitchPreference是否与android-support-v4库兼容？

不，对不起。

但是，如果还没有人支持它，它不应该太棘手。

实际上，它可能有点痛苦，因为它也需要一个Switch的backport，并且backporting widgets有时很麻烦，因为它们经常使用backports无法访问的package-private方法。

我知道我可以制作一个单独的资源文件来区分API版本，但是我想尽可能避免这种情况。

好吧，那肯定会比其它方法更简单：

• 上述反向移植

• 创造某种别名Preference机制，允许您使用较新设备上SwitchPreference和CheckBoxPreference只有一个资源文件的旧设备上

Answer 2

android-switch-backport有一个适用于Android 2.1+的SwitchPreference。

https://github.com/BoD/android-switch-backport

Answer 3

我试过每一个解决方案，我发现，但其中不被满足我的需要，所以我创建了自己的小部件至极从nineOld兼容性LIB使用ObjectAnimator和工作得罚款任何Android API。

import android.widget.RelativeLayout; 
import com.myapp.utilities.AppUtils; 
import com.nineoldandroids.animation.Animator; 
import com.nineoldandroids.animation.AnimatorListenerAdapter; 
import com.nineoldandroids.animation.ObjectAnimator; 

public class SwitchButton extends RelativeLayout { 

public static final int TEXT_SIZE = 11; 

public float HANDLE_SHIFT = -40f; 
public float TEXT_RIGHT_SHIFT = 40f; 
public static int BUTTON_ID = 0x00009999; 
public static int TEXT_ID = 0x00008888; 


private Button handleButton; 
private RoboTextView textView; 
private boolean switchEnabled; 
private String yesStr; 
private String noStr; 
private int TEXT_LEFT_PADDING = 13; 

private ObjectAnimator animateHandleLeftShift; 
private ObjectAnimator animateHandleRightShift; 
private int HANDLE_BUTTON_HEIGHT = 22; 
private int HANDLE_BUTTON_WIDTH = 42; 
private ObjectAnimator animateTextLeftShift; 
private ObjectAnimator animateTextRightShift; 


public SwitchButton(Context context) { 
    super(context); 
    onCreate(context); 
} 


private void onCreate(Context context) { 

    float density = context.getResources().getDisplayMetrics().density; 

    TEXT_LEFT_PADDING *= density; 

    HANDLE_BUTTON_HEIGHT *= density; 
    HANDLE_BUTTON_WIDTH *= density; 

    HANDLE_SHIFT *= density; 
    TEXT_RIGHT_SHIFT *= density; 

    yesStr = getContext().getString(R.string.yes).toUpperCase(); 
    noStr = getContext().getString(R.string.no).toUpperCase(); 

    {// Button 
     handleButton = new Button(getContext()); 
     RelativeLayout.LayoutParams buttonParams = new LayoutParams(HANDLE_BUTTON_WIDTH, HANDLE_BUTTON_HEIGHT); 
     buttonParams.addRule(RelativeLayout.CENTER_VERTICAL); 
     buttonParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 

     handleButton.setBackgroundResource(R.drawable.button_switch_handle_selector); 
     handleButton.setId(BUTTON_ID); 

     addView(handleButton, buttonParams); 
    } 


    {// Text 
     textView = new RoboTextView(getContext()); 
     LayoutParams textParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); 
     textParams.addRule(RelativeLayout.CENTER_VERTICAL); 

     textView.setText(yesStr); 
     textView.setTextColor(getContext().getResources().getColor(R.color.new_normal_gray)); 
     textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, TEXT_SIZE); 
     textView.setPadding(TEXT_LEFT_PADDING, 0, 0, 0); 
     textView.setFont(RoboTextView.ROBOTO_BOLD_FONT); 
     textView.setId(TEXT_ID); 
     float shadowRadius = 0.5f ; 
     float shadowDx = 0; 
     float shadowDy = 1; 
     textView.setShadowLayer(shadowRadius, shadowDx, shadowDy, Color.BLACK); 

     addView(textView, textParams); 
    } 
    initFlipAnimation(); 

} 

@Override 
public void setOnClickListener(OnClickListener l) { 
    handleButton.setOnClickListener(l); 
    textView.setOnClickListener(l); 
} 

public void toggle(View view){ 
    if (AppUtils.HONEYCOMB_PLUS_API && view.getId() == TEXT_ID) { // ignore text clicks 
     return; 
    } 

    switchEnabled = !switchEnabled; 

    if (switchEnabled) { 
     // animate handle to the left 
     animateHandleLeftShift.start(); 
     animateTextLeftShift.start(); 

     textView.setText(noStr); 
    } else { 
     animateHandleRightShift.start(); 
     animateTextRightShift.start(); 

     textView.setText(yesStr); 
    } 
} 

private android.view.animation.Interpolator accelerator = new LinearInterpolator(); 
private static final int DURATION = 70; 

private void initFlipAnimation() { 


    animateHandleLeftShift = ObjectAnimator.ofFloat(handleButton, "translationX", 0f, HANDLE_SHIFT); 
    animateHandleLeftShift.setDuration(DURATION); 
    animateHandleLeftShift.setInterpolator(accelerator); 

    animateHandleRightShift = ObjectAnimator.ofFloat(handleButton, "translationX", HANDLE_SHIFT, 0f); 
    animateHandleRightShift.setDuration(DURATION); 
    animateHandleRightShift.setInterpolator(accelerator); 

    animateHandleLeftShift.addListener(new AnimatorListenerAdapter() { 
     @Override 
     public void onAnimationEnd(Animator anim) { 
      // TODO 
     } 
    }); 


    animateTextLeftShift = ObjectAnimator.ofFloat(textView, "translationX", 0f, TEXT_RIGHT_SHIFT); 
    animateTextLeftShift.setDuration(DURATION); 
    animateTextLeftShift.setInterpolator(accelerator); 

    animateTextRightShift = ObjectAnimator.ofFloat(textView, "translationX", TEXT_RIGHT_SHIFT, 0f); 
    animateTextRightShift.setDuration(DURATION); 
    animateTextRightShift.setInterpolator(accelerator); 
} 

}

在XML

<com.chess.SwitchButton 
    android:id="@+id/ratedGameSwitch" 
    android:layout_width="@dimen/button_switch_width" 
    android:layout_height="@dimen/button_switch_height" 
    android:background="@drawable/button_switch_back" 
    /> 

在活动/片段，你只需要findViewById，并设置clickListener它，并在的onClick回调处理：

switchButton = (SwitchButton) optionsView.findViewById(R.id.ratedGameSwitch); 
switchButton.setOnClickListener(this); 


@Override 
public void onClick(View view) { 
    if (view.getId() == SwitchButton.BUTTON_ID || view.getId() == SwitchButton.TEXT_ID){ 
     switchButton.toggle(view); 
    } 
} 

Answer 4

如果您想以编程方式创建设置活动，请尝试此解决方案。

public class SettingsActivity extends PreferenceActivity { 

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH) 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     PreferenceScreen rootScreen = getPreferenceManager() 
       .createPreferenceScreen(this); 
     setPreferenceScreen(rootScreen); 
     Preference NotifCheck=null; 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { 
      NotifCheck = new SwitchPreference(this); 

     } else { 
      NotifCheck = new CheckBoxPreference(this); 

     } 
     NotifCheck.setKey("yourKey"); 
     NotifCheck.setTitle(R.string.ShowNotification); 
     NotifCheck.setEnabled(true); 
     rootScreen.addPreference(NotifCheck); 
    } 
}