我是Android开发中的新手，我试图了解如何在界面中使用回调。
我在我的应用中使用"Color-pick-preference"库。我需要它来改变不同的设置，例如背景颜色。我想在运行时更改，无需刷新活动。
这就是我现在的表现：
颜色选择器偏好有三个主要类别：
ColorPickerView（据我了解它显示颜色面板并通过回调将用户选择发送到ColorPickerDialog）
ColorPickerDialog（此类显示优先对话窗口包括颜色面板，提交颜色按钮等，并在ColorPickerPreference中进一步发送用户选择数据）
和ColorPicerPreference，用于在共享首选项中保存用户选择。
如果你原谅我，我的描述非常浅薄。
这三个文件的一部分
ColorPickerView
***
***
private OnColorChangedListener mListener;
***
public interface OnColorChangedListener {
public void onColorChanged(int color);
}
***
@Override
public boolean onTouchEvent(MotionEvent event) {
boolean update = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mStartTouchPoint = new Point((int) event.getX(), (int) event.getY());
update = moveTrackersIfNeeded(event);
break;
case MotionEvent.ACTION_MOVE:
update = moveTrackersIfNeeded(event);
break;
case MotionEvent.ACTION_UP:
mStartTouchPoint = null;
update = moveTrackersIfNeeded(event);
break;
}
if (update) {
if (mListener != null) {
mListener.onColorChanged(Color.HSVToColor(mAlpha, new float[]{mHue, mSat, mVal}));
}
invalidate();
return true;
}
return super.onTouchEvent(event);
}
***
public void setOnColorChangedListener(OnColorChangedListener listener) {
mListener = listener;
}
***
public void setColor(int color, boolean callback) {
int alpha = Color.alpha(color);
float[] hsv = new float[3];
Color.colorToHSV(color, hsv);
mAlpha = alpha;
mHue = hsv[0];
mSat = hsv[1];
mVal = hsv[2];
if (callback && mListener != null) {
mListener.onColorChanged(Color.HSVToColor(mAlpha, new float[]{mHue, mSat, mVal}));
}
invalidate();
}
ColorPickerDialog
***
public class ColorPickerDialog
extends
Dialog
implements
ColorPickerView.OnColorChangedListener,
View.OnClickListener, ViewTreeObserver.OnGlobalLayoutListener ...
***
private OnColorChangedListener mListener;
***
public interface OnColorChangedListener {
public void onColorChanged(int color);
}
***
private void setUp(int color) {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mLayout = inflater.inflate(R.layout.dialog_color_picker, null);
mLayout.getViewTreeObserver().addOnGlobalLayoutListener(this);
mOrientation = getContext().getResources().getConfiguration().orientation;
setContentView(mLayout);
setTitle(R.string.dialog_color_picker);
mColorPicker = (ColorPickerView) mLayout.findViewById(R.id.color_picker_view);
mOldColor = (ColorPickerPanelView) mLayout.findViewById(R.id.old_color_panel);
mNewColor = (ColorPickerPanelView) mLayout.findViewById(R.id.new_color_panel);
mHexVal = (EditText) mLayout.findViewById(R.id.hex_val);
mHexVal.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
mHexDefaultTextColor = mHexVal.getTextColors();
mHexVal.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_ACTION_DONE) {
InputMethodManager imm = (InputMethodManager) v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
String s = mHexVal.getText().toString();
if (s.length() > 5 || s.length() < 10) {
try {
int c = ColorPickerPreference.convertToColorInt(s.toString());
mColorPicker.setColor(c, true);
mHexVal.setTextColor(mHexDefaultTextColor);
} catch (IllegalArgumentException e) {
mHexVal.setTextColor(Color.RED);
}
} else {
mHexVal.setTextColor(Color.RED);
}
return true;
}
return false;
}
});
((LinearLayout) mOldColor.getParent()).setPadding(
Math.round(mColorPicker.getDrawingOffset()),
0,
Math.round(mColorPicker.getDrawingOffset()),
0
);
mOldColor.setOnClickListener(this);
mNewColor.setOnClickListener(this);
mColorPicker.setOnColorChangedListener(this);
mOldColor.setColor(color);
mColorPicker.setColor(color, true);
}
***
@Override
public void onColorChanged(int color) {
mNewColor.setColor(color);
if (mHexValueEnabled)
updateHexValue(color);
}
***
public void setOnColorChangedListener(OnColorChangedListener listener) {
mListener = listener;
}
ColorPickerPreference
public class ColorPickerPreference
extends
Preference
implements
Preference.OnPreferenceClickListener,
ColorPickerDialog.OnColorChangedListener ...
***
@Override
public void onColorChanged(int color) {
if (isPersistent()) {
persistInt(color);
}
mValue = color;
setPreviewColor();
try {
getOnPreferenceChangeListener().onPreferenceChange(this, color);
} catch (NullPointerException e) {
}
notifyChanged();
}
***
protected void showDialog(Bundle state) {
mDialog = new ColorPickerDialog(getContext(), mValue);
mDialog.setOnColorChangedListener(this);
if (mAlphaSliderEnabled) {
mDialog.setAlphaSliderVisible(true);
}
if (mHexValueEnabled) {
mDialog.setHexValueEnabled(true);
}
if (state != null) {
mDialog.onRestoreInstanceState(state);
}
mDialog.show();
}
我在MainActivity中尝试做什么
public class MainActivity extends AppCompatActivity implements
ColorPickerDialog.OnColorChangedListener {
public ColorPickerDialog cpd;
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
//return super.onOptionsItemSelected(item);
Integer id = item.getItemId();
switch (id) {
case R.id.menu_action_settings:
Intent i = new Intent(this, SettingActivity.class);
startActivity(i);
break;
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
cpd = new ColorPickerDialog(this,Color.BLACK);
cpd.setOnColorChangedListener(this);
setContentView(R.layout.activity_main);
}
public void onColorChanged(int color) {
RelativeLayout main_scroll_view = (RelativeLayout)findViewById(R.id.activity_main_rel_layout);
System.out.println("AIM ALIVE!");
main_scroll_view.setBackgroundColor(color);
}
}
但是当我在ColorPickerPreference小部件中更改颜色时 - 没有任何反应。背景颜色不会改变，我的System.out.println不起作用？
对不起混乱的演讲，谢谢你的回答。
我自己更多的是挑战）通过在Mainactivity中添加onResume方法并检查共享首选项然后在结果值中设置背景颜色来解决问题。
答案 0 :(得分：0)
您在哪里声明操作以便显示/打开对话框？
答案 1 :(得分：0)
SettingActivity
***
public static class SettingsFragment extends PreferenceFragment {
PrefernceAnimation pa;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String settings = getArguments().getString("settings");
if ("colors".equals(settings)) {
addPreferencesFromResource(R.xml.preference_fragment_colors);
} else if ("sounds".equals(settings)) {
addPreferencesFromResource(R.xml.preference_fragment_sounds);
}
else if ("animation".equals(settings)) {
addPreferencesFromResource(R.xml.preference_fragment_animation);
}
}
}
和preference_headers.xml
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="com.dosomeweb.mika.babypic.SettingActivity$SettingsFragment"
android:title="@string/pref_main_title_colors"
android:summary="@string/pref_main_summery_colors">
<extra
android:name="settings"
android:value="colors"/>
</header>
<header
android:fragment="com.dosomeweb.mika.babypic.SettingActivity$SettingsFragment"
android:title="@string/pref_main_title_sounds"
android:summary="@string/pref_main_summery_sounds">
<extra
android:name="settings"
android:value="sounds"/>
</header>
<header
android:fragment="com.dosomeweb.mika.babypic.SettingActivity$SettingsFragment"
android:title="@string/pref_main_title_animation"
android:summary="@string/pref_main_summery_animation">
<extra
android:name="settings"
android:value="animation"/>
</header>
以防prference_fragment_colors.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<net.margaritov.preference.colorpicker.ColorPickerPreference
android:key="pref_bg_color"
android:title="@string/pref_title_layout_bg_color"
android:summary="@string/pref_summary_layout_bg_color"
android:defaultValue="@color/colorAccent"/>
</PreferenceScreen>
答案 2 :(得分：0)
为什么要创建这么多不同的界面？为什么不使用1个接口并将它们全部链接在一起，因为回调具有相同的参数。