| toRoundBitmap |
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public static Bitmap toRoundBitmap(Bitmap bitmap) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
float roundPx;
float left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;
if (width <= height) {
roundPx = width / 2;
top = 0;
bottom = width;
left = 0;
right = width;
height = width;
dst_left = 0;
dst_top = 0;
dst_right = width;
dst_bottom = width;
} else {
roundPx = height / 2;
float clip = (width - height) / 2;
left = clip;
right = width - clip;
top = 0;
bottom = height;
width = height;
dst_left = 0;
dst_top = 0;
dst_right = height;
dst_bottom = height;
}
Bitmap output = Bitmap.createBitmap(width,
height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff424242;
final Paint paint = new Paint();
final Rect src = new Rect((int)left, (int)top, (int)right, (int)bottom);
final Rect dst = new Rect((int)dst_left, (int)dst_top, (int)dst_right, (int)dst_bottom);
final RectF rectF = new RectF(dst);
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bitmap, src, dst, paint);
return output;
}
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| FileOperations |
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public synchronized static void writeFile(String lineStr, Context context) {
File f = context.getFileStreamPath(CACHE_FILE_NAME);
boolean isFileExist = f.exists();
try {
FileOutputStream fout = context.openFileOutput(CACHE_FILE_NAME, Context.MODE_PRIVATE|Context.MODE_APPEND);
OutputStreamWriter writer = new OutputStreamWriter(fout, "UTF-8");
if (isFileExist) {
writer.write(lineStr + "\t\n");
} else {
String headerLine = String.format("%s,%s,%s,%s", KEY_1, KEY_2, KEY_3,KEY_4);
writer.write(headerLine + "\t\n");
writer.write(lineStr + "\t\n");
}
writer.close();
fout.close();
} catch (IOException e) {
Log.e(TAG, "Exception happens", e);
}
}
//读数据
public synchronized static String readFile(Context context) {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(context.openFileInput(CACHE_FILE_NAME), "UTF-8"));
String line = "";
StringBuilder sb = new StringBuilder();
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
return sb.toString();
} catch (IOException e) {
Log.e(TAG, "Exception happens", e);
}
return "empty";
}
public synchronized static boolean copyAndDeleteOriginalFile(Context context) {
try {
File cacheFile = context.getFileStreamPath(CACHE_FILE_NAME);
if(!cacheFile.exists()) {
return false;
}
int byteread = 0;
InputStream inStream = context.openFileInput(CACHE_FILE_NAME);
FileOutputStream fs
= context.openFileOutput(BAK_CACHE_FILE_NAME, Context.MODE_PRIVATE);
byte[] buffer = new byte[1024];
while ((byteread = inStream.read(buffer)) != -1) {
fs.write(buffer, 0, byteread);
}
fs.flush();
fs.close();
inStream.close();
//Delete the original file.
context.deleteFile(CACHE_FILE_NAME);
return true;
} catch (FileNotFoundException e) {
Log.e(TAG, "Exception happens", e);
} catch (IOException e) {
Log.e(TAG, "Exception happens", e);
}
return false;
}
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| Combined Image |
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<!--
combined_image.xml, put in drawable folder.
image_2 将在image_1的右下角
-->
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="@+id/icon_1">
<bitmap
android:gravity ="center_vertical"
android:src="@drawable/image_1"/>
</item>
<item
android:id="@+id/icon_2"
android:left="15.0dip"
android:top="25.0dip">
<bitmap
android:gravity="bottom"
android:src="@drawable/image_2" />
</item>
</layer-list>
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| Get Storage Available Space |
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public long getInternalStorageAvailableSpace(String storagePath) {
StatFs stat = new StatFs(storagePath);
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return blockSize * availableBlocks;
}
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| Basic View Extension |
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//Java
public class CustomeView extends RelativeLayout {
public CustomeView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initUI(context);
}
public CustomeView(Context context, AttributeSet attrs) {
super(context, attrs);
initUI(context);
}
public CustomeView(Context context) {
super(context);
initUI(context);
}
private void initUI(Context context) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.custome_view, this);
//Do more
}
}
//custome_view.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageV1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/v1" >
</ImageView>
<ImageView
android:id="@+id/imageV2"
android:layout_width="20dip"
android:layout_height="20dip"
android:layout_alignTop = "@+id/imageV1"
android:layout_alignLeft = "@+id/imageV1"
android:layout_marginLeft = "-1dip"
android:layout_marginTop = "-1dip"
android:src="@drawable/v2" >
</ImageView>
</RelativeLayout>
/**
* RelativeLayout用到的一些重要的属性：
* 第一类:属性值为true或false
* android:layout_centerHrizontal 水平居中
* android:layout_centerVertical 垂直居中
* android:layout_centerInparent 相对于父元素完全居中
* android:layout_alignParentBottom 贴紧父元素的下边缘
* android:layout_alignParentLeft 贴紧父元素的左边缘
* android:layout_alignParentRight 贴紧父元素的右边缘
* android:layout_alignParentTop 贴紧父元素的上边缘
* android:layout_alignWithParentIfMissing 如果对应的兄弟元素找不到的话就以父元素做参照物
* 第二类：属性值必须为id的引用名“@id/id-name”
* android:layout_below 在某元素的下方
* android:layout_above 在某元素的的上方
* android:layout_toLeftOf 在某元素的左边
* android:layout_toRightOf 在某元素的右边
* android:layout_alignTop 本元素的上边缘和某元素的的上边缘对齐
* android:layout_alignLeft 本元素的左边缘和某元素的的左边缘对齐
* android:layout_alignBottom 本元素的下边缘和某元素的的下边缘对齐
* android:layout_alignRight 本元素的右边缘和某元素的的右边缘对齐
* 第三类：属性值为具体的像素值，如30dip，40px
* android:layout_marginBottom 离某元素底边缘的距离
* android:layout_marginLeft 离某元素左边缘的距离
* android:layout_marginRight 离某元素右边缘的距离
* android:layout_marginTop 离某元素上边缘的距离
*/
//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white"
android:orientation="vertical" >
<com.view.research.CustomeView
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</com.view.research.CustomeView>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
</LinearLayout>
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| Create a dialog |
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private void createDialog(final Context context, final Runnable callback){
final View view = LayoutInflater.from(context).inflate(R.layout.xxxx, null);
final CheckBox box = (CheckBox)view.findViewById(R.id.check_box);
box.setChecked(true);
final AlertDialog dialog = new AlertDialog.Builder(context)
.setIcon(null)
.setTitle(R.string.aTitle)
.setView(view)
.setOnCancelListener(new DialogInterface.OnCancelListener(){
@Override
public void onCancel(DialogInterface dialog) {
dialog.dismiss();
OutsideActivity.this.finish();
}
}).setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Do yes
dialog.dismiss();
}
}).setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
OutsideActivity.this.finish();
}
}).create();
dialog.show();
}
//xxxx.xml example content
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="@color/white">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
android:layout_weight="1" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:maxLines="10000"
android:singleLine="false"
android:text="blablablablabla"/>
</ScrollView>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_weight="0"
android:orientation="horizontal" >
<CheckBox
android:id="@+id/check_box"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:gravity="center"
android:text="lalalala"/>
</LinearLayout>
</LinearLayout>
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