Android 基础
文章目录
- 刷新媒体库
- 修改状态栏颜色
- 修改字体颜色
- 显示隐藏状态栏
- 布局边框 outlineProvider
- FragmentPagerAdapter 加载
- TextView 设置 Drawable
- 拍照快门声
- toJsonTree
- 输出堆栈
- LIstView
- 验证并初始化GLS
- List 嵌套
- SpannerString
- 防抖动
刷新媒体库
class MediaUtils {
companion object {
/**
* 刷新media显示，使用MediaScannerConnection.scanFile会导致MediaScanner ServiceConnectionLeaked低概率错误，因此改用广播的方式
* 2017.11.17改为scanFile，改成广播的方式会导致SD卡内容无法及时刷新
*
* @param ctx
* @param filePath
*/
fun noticeMediaScanner(ctx: Context, filePath: String?) {
if (null == filePath) {
return
}
MediaScannerConnection.scanFile(
ctx,
arrayOf(filePath), null
) { _, _ -> }
}
}
init {
throw AssertionError("cannot be instantiated")
}
}
修改状态栏颜色
fun initStatusBar() {
var statusBarView: View? = null
if (statusBarView == null) {
//利用反射机制修改状态栏背景
val identifier = resources.getIdentifier("statusBarBackground", "id", "android")
statusBarView = window.findViewById<View>(identifier)
}
if (statusBarView != null) {
statusBarView.setBackgroundResource(R.drawable.top_bar_background)
}
}
修改字体颜色
/**
* 界面设置状态栏字体颜色
*/
fun changeStatusBarTextImgColor(isBlack: Boolean) {
if (isBlack) {
//设置状态栏黑色字体
window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR
} else {
//恢复状态栏白色字体
window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE
}
}
显示隐藏状态栏
fun hideStatusBar() {
window.decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
// or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
// or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_FULLSCREEN
or View.SYSTEM_UI_FLAG_IMMERSIVE)
if (Build.VERSION.SDK_INT < 30) {
window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
window.clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
} else {
val v = window.decorView
val uiOptions = (View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_FULLSCREEN)
v.setSystemUiVisibility(uiOptions)
}
}
fun showStatusBar() {
window.decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE
or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN)
}
布局边框 outlineProvider
android:outlineProvider="bounds"
ViewOutlineProvider viewOutlineProvider = new ViewOutlineProvider() {
@Override
public void getOutline(View view, Outline outline) {
outline.setOval(0,0,mImg.getWidth(), mImg.getHeight());
}
};
mImg.setOutlineProvider(viewOutlineProvider);
mImg.setClipToOutline(true);
FragmentPagerAdapter 加载
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentTransaction;
import android.view.ViewGroup;
import com.proginn.base.BaseFragment;
import java.util.List;
public class BaseFragmentAdapter extends FragmentPagerAdapter {
private List<BaseFragment> fragments;
private String[] titles;
private FragmentManager fm;
public BaseFragmentAdapter(FragmentManager fm, List<BaseFragment> fragments, String[] titles) {
super(fm);
this.fm = fm;
this.titles = titles;
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return fragments.size();
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
FragmentTransaction ft = fm.beginTransaction();
for (int i = 0; i < getCount(); i++) {//通过遍历清除所有缓存
final long itemId = getItemId(i);
//得到缓存fragment的名字
String name = makeFragmentName(container.getId(), itemId);
//通过fragment名字找到该对象
BaseFragment fragment = (BaseFragment) fm.findFragmentByTag(name);
if (fragment != null) {
//移除之前的fragment
ft.remove(fragment);
}
}
//重新添加新的fragment:最后记得commit
ft.add(container.getId(), getItem(position)).attach(getItem(position)).commit();
return getItem(position);
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
/**
* 得到缓存fragment的名字
*
* @param viewId
* @param id
* @return
*/
private String makeFragmentName(int viewId, long id) {
return "android:switcher:" + viewId + ":" + id;
}
}
TextView 设置 Drawable
mTvWorkWay.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.icon_selectmore_active, 0);
拍照快门声
var audioManager: AudioManager = requireActivity().getSystemService(Context.AUDIO_SERVICE) as AudioManager
var ringerMode = audioManager.getRingerMode()
mMediaActionSound = MediaActionSound()
mMediaActionSound.load(MediaActionSound.SHUTTER_CLICK)
//铃音模式
if (ringerMode == AudioManager.RINGER_MODE_NORMAL) {
mMediaActionSound.play(MediaActionSound.SHUTTER_CLICK)
}
toJsonTree
//避免泛型擦除
/**
* 用于保存集合
*
* @param key key
* @param list 集合数据
* @return 保存结果
*/
public static <T> boolean putListData(SharedPreferences sp, String key, LinkedList<T> list) {
boolean result;
SharedPreferences.Editor editor = sp.edit();
JsonArray array = new JsonArray();
Gson gson = new Gson();
for (int i = 0; i < list.size(); i++) {
JsonElement obj = gson.toJsonTree(list.get(i));
array.add(obj);
}
}
/**
* 获取保存的List
*
* @param key key
* @return 对应的Lis集合
*/
public static <T> LinkedList<T> getListData(SharedPreferences sp, String key, Class<T> cls) {
LinkedList<T> list = new LinkedList<>();
String json = sp.getString(key, "");
if (!json.equals("") && json.length() > 0) {
Gson gson = new Gson();
JsonArray array = new JsonParser().parse(json).getAsJsonArray();
for (JsonElement elem : array) {
list.add(gson.fromJson(elem, cls));
}
}
return list;
}
输出堆栈
Writer writer = new StringWriter();
PrintWriter printWriter = new PrintWriter(writer);
ex.printStackTrace(printWriter);
Throwable cause = ex.getCause();
while (cause != null) {
cause.printStackTrace(printWriter);
cause = cause.getCause();
}
printWriter.close();
String result = writer.toString();
LIstView
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder;
if (convertView == null) {
holder = new Holder();
···
convertView.setTag(holder);
} else {
holder = (Holder) convertView.getTag();
}
}
static class Holder {
}
验证并初始化GLS
private GLFrameSurface mGLSurfaceView;
private GLFrameRenderer mRenderer;
private boolean supportsEs2;
public class GLFrameSurface extends GLSurfaceView {
String TAG = "GLFrameSurface";
public GLFrameSurface(Context context) {
super(context);
}
public GLFrameSurface(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onAttachedToWindow() {
Log.v(TAG, "surface onAttachedToWindow()");
super.onAttachedToWindow();
// setRenderMode() only takes effectd after SurfaceView attached to window!
// note that on this mode, surface will not render util GLSurfaceView.requestRender() is
// called, it's good and efficient -v-
setRenderMode(RENDERMODE_WHEN_DIRTY);
Log.v(TAG, "surface setRenderMode RENDERMODE_WHEN_DIRTY");
}
}
private void initFusionGlSurface() {
mGLSurfaceView = new GLFrameSurface(this);
mGLSurfaceView.setVisibility(View.INVISIBLE);
ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
supportsEs2 = configurationInfo.reqGlEsVersion >= 0x20000;
if (supportsEs2) {
// Request an OpenGL ES 2.0 compatible context.
mGLSurfaceView.setEGLContextClientVersion(2);
mRenderer = new GLFrameRenderer(this, mGLSurfaceView);
mGLSurfaceView.setRenderer(mRenderer);
}
mAnalyserIfrCameraShow.addView(mGLSurfaceView);
// 这句代码很重要，没有它会出现异常情况;
mGLSurfaceView.setZOrderMediaOverlay(true);
}
List 嵌套
public class ScrollListView extends ListView {
public ScrollListView(Context context) {
super(context);
}
public ScrollListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ScrollListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}
SpannerString
可点击，可变色字符串
@NonNull
public static SpannableString createAgreementString(
@NonNull final Activity activity, @NonNull String format) {
String smrz = new String("实名个人信息");
String zxkf = new String("在线客服");
String agreementString = String.format(Locale.ENGLISH, format, "实名个人信息认证", "在线客服");
SpannableString spannableString = new SpannableString(agreementString);
int smrzSI = agreementString.indexOf(smrz);
int zxkfSI = agreementString.indexOf(zxkf);
spannableString.setSpan(new ClickableSpan() {
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
ds.setColor(activity.getResources().getColor(R.color.app_color));
ds.setUnderlineText(false);
}
@Override
public void onClick(View widget) {
}
}, smrzSI, smrzSI+smrz.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(new ClickableSpan() {
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
ds.setColor(activity.getResources().getColor(R.color.app_color));
ds.setUnderlineText(false);
}
@Override
public void onClick(View widget) {
RouterHelper.startWebView(activity, activity.getString(R.string.service_url));
}
}, zxkfSI, zxkfSI+zxkf.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return spannableString;
}
防抖动
import android.os.SystemClock;
public class FastClickInterceptor {
private static final long MIN_INTERVAL = 1000;
private long mLastClickTime;
public boolean shouldIntercept() {
if (SystemClock.elapsedRealtime() - mLastClickTime < MIN_INTERVAL) {
return true;
}
mLastClickTime = SystemClock.elapsedRealtime();
return false;
}
}