android開發中積累的小知識
From: http://blog.csdn.net/zhou123shao/article/details/22926367
一：開機logo ，在根路徑7627a_splash下把圖片放入，執行splash.sh檔案
然後再把splash.txt中的值複製粘帖在bootable/bootloader/lk/target/專案名/include/target/的splash.h檔案中
再make aboot
把out/target/product/專案名/下面(emmc_appsboot.mbn,emmc_appsboothd.mbn)這個是針對與emmc,或者是(appsboot.mbn,appsboothd.mbn)這個是針對nand。把這2個檔案考出來，在window下用qts燒寫進去。
把製作好的bootanimation.zip和shutdownanimation.zip放到 /system/core/rootdir/專案名/。
可以直接push到機器的system/media下面，重啟就可以看到效果
三：判斷專案名import android.os.SystemProperties;
private boolean mIsA100 = "msm7627a_v12_a100".equals(SystemProperties.get("ro.product.name"));
if("1".equals(SystemProperties.get("persist.sys.emmcsdcard.enabled")))這是把記憶體設在為內部儲存
在cpp檔案中
#include <cutils/properties.h>
char value[PROPERTY_VALUE_MAX];
property_get("sys.secpolicy.camera.disabled", value, "0");獲取值
五：進入fastboot模式，可以命令adb reboot-bootloader,#*20110606#開啟測試開關
六：新增USB,在/etc/udev/rules.d下
七：
Intent.ACTION_USER_PRESENT這個為解鎖的廣播
KeyguardManager mKeyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
if (mKeyguardManager.inKeyguardRestrictedInputMode()) {
為鎖屏狀態
}
八：檢測耳機是否插入 public boolean checkHeadSet() {
AudioManager audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
return audio.isWiredHeadsetOn();
}
Intent.ACTION_HEADSET_PLUG這個為監聽耳機的插拔
九：給應用分配最小的記憶體
VMRuntime.getRuntime()
.setTargetHeapUtilization(TARGET_HEAP_UTILIZATION);
VMRuntime.getRuntime().setMinimumHeapSize(CWJ_HEAP_SIZE);
private final static float TARGET_HEAP_UTILIZATION = 0.75f;
private final static int CWJ_HEAP_SIZE = 6 * 1024 * 1024;
十：monkey測試的命令
adb shell monkey -v -p com.android.XXX --pct-nav 0 --pct-majornav 0 --pct-anyevent 0 --ignore-security-exceptions --throttle 100 -v 50000
public static Bitmap createVideoThumbnail(Context context, Uri uri) {
Bitmap bitmap = null;
String className = "android.media.MediaMetadataRetriever";
Object objectMediaMetadataRetriever = null;
Method release = null;
try {
objectMediaMetadataRetriever = Class.forName(className).newInstance();
Method setModeMethod = Class.forName(className).getMethod("setMode", int.class);
setModeMethod.invoke(objectMediaMetadataRetriever,
MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);
Method setDataSourceMethod = Class.forName(className).getMethod(
"setDataSource", Context.class, Uri.class);
setDataSourceMethod.invoke(objectMediaMetadataRetriever, context,uri);
Method captureFrameMethod = Class.forName(className).getMethod("captureFrame");
release = Class.forName(className).getMethod("release");
bitmap = (Bitmap) captureFrameMethod
.invoke(objectMediaMetadataRetriever);
} catch (Exception e) {
e.printStackTrace();
} finally {try {
if (release != null) {
release.invoke(objectMediaMetadataRetriever);
}
} catch (Exception e) {
// Ignore failures while cleaning up.
e.printStackTrace();
}
}
return bitmap;
}
十二：8x25系列camera配置
後攝 500 萬 ov5640 ov5647 s5k4e1已經新增
前攝 30萬 gc0339 ov9726 ov7692 也已新增
kernel/arch/arm/configs/msm8x25_d8_eg530-perf_defconfig
十三：判斷music是否在播放
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
if(audioManager.isMusicActive())
{
......}
android.os.Process.killProcess(android.os.Process.myPid());
十五：抓取log
1:帶有時間的log: adb logcat -v time >>log.txt
2:把log儲存在手機裡面，這時候可以在後臺執行
adb shell; logcat -vtime >data/log.txt &
十六：選擇編譯，例如在Android.mk裡面，如果msm8x25q_d10_j320c專案，則編譯d10_j320c/AndroidManifest.xml這個檔案。
ifneq (, $(filter msm8x25q_d10_j320c, $(TARGET_PRODUCT)))
LOCAL_MANIFEST_FILE := d10_j320c/AndroidManifest.xml
endif
十七：外部U盤無法掛載
在DOS中鍵入, chkdsk F: /f
十八：隱藏輸入法
1：隱藏其他應用開啟的輸入法
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
imm.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);
2：隱藏本應用開啟的輸入法
InputMethodManager inputMethodManager = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.hideSoftInputFromWindow(OpeListActivity.this.getCurrentFocus().getWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS)；
十九：camera的翻轉
有兩個地方可以改，但是這個要是情況而定，改其中一個
1：在CameraService.cpp中的sendCommand中
if (cmd == CAMERA_CMD_SET_DISPLAY_ORIENTATION) {
// Mirror the preview if the camera is front-facing.
bool isqqpimsecure = false;
if (mCameraFacing == CAMERA_FACING_FRONT) {
int fd;
char buf[1024] = {0};
if ((fd = open(buf,O_RDONLY)) != -1) {
if((read(fd, buf, 1023)) != -1) {
ALOGE("sendCommand pid=%d, pname=%s", getCallingPid(), buf);
}
close(fd);
}
if (strcmp(buf, "com.tencent.qqpimsecure") == 0 || strcmp(buf, "com.tencent.mobileqq") == 0 || strcmp(buf, "com.tencent.mobileqq:video") == 0) {
ALOGE("sendCommand pid=%d, pname=%s modifty 180 for com.tencent.qqpimsecure", getCallingPid(), buf);
isqqpimsecure = true;
}
}
orientation = getOrientation(isqqpimsecure ? (arg1 + 180) : arg1, mCameraFacing == CAMERA_FACING_FRONT);
if (orientation == -1) return BAD_VALUE;
if (mOrientation != orientation) {
mOrientation = orientation;
if (mPreviewWindow != 0) {
native_window_set_buffers_transform(mPreviewWindow.get(),
mOrientation);
}
}
return OK;
}
2：在CameraService.cpp中的getCameraInfo修改。
status_t CameraService::getCameraInfo(int cameraId,
struct CameraInfo* cameraInfo) {
if (!mModule) {
return NO_INIT;
}
if (cameraId < 0 || cameraId >= mNumberOfCameras) {
return BAD_VALUE;
}
struct camera_info info;
status_t rc = mModule->get_camera_info(cameraId, &info);
cameraInfo->facing = info.facing;
cameraInfo->orientation = info.orientation;
if (cameraId == CAMERA_FACING_FRONT) {
int fd;
char buf[1024] = {0};
char value2[PROPERTY_VALUE_MAX];
property_get("ro.product.name", value2, "0");
bool isv10_yd=false;
if(strcmp(value2,"msm8x25_v10_w656_yd")==0){
isv10_yd=true;
}
snprintf(buf,1024,"/proc/%d/cmdline",getCallingPid());
if ((fd = open(buf,O_RDONLY)) != -1) {
if((read(fd, buf, 1023)) != -1) {
LOGE("getCameraInfo pid=%d, pname=%s", getCallingPid(), buf);
}
close(fd);
}
if (!isv10_yd && strcmp(buf, "com.tencent.mm") == 0) {
LOGE("getCameraInfo pid=%d, pname=%s modifty 180 for weixin", getCallingPid(), buf);
cameraInfo->orientation += 180;
}else if(strcmp(buf, "com.google.android.talk")==0){
cameraInfo->orientation += 180;
}
}
return rc;
}
二十：當手機沒有許可權的時候，以下方法可以獲取許可權，進行install或者push.
#mount
# mount -o remount /dev/block/mtdblock1 /system
# chmod 777 system/app
二十一：CTStest
4.1平臺cts命令：單測試某個case: run cts -c class name -m case name 比如：run cts -c android.hardware.cts.CameraGLTest -m testCameraToSurfaceTextureMetadata
測試一個包： run cts -c class name; 比如：run cts -c android.hardware.cts.CameraGLTest
2.3平臺cts命令:單測試某個case : start --plan CTS -t class name#case name ,比如,start --plan CTS -t android.hardware.cts.CameraGLTest#testCameraToSurfaceTextureMetadata
測試一個包：start --plan CTS -p class name, 比如： start --plan CTS -p android.hardware.cts.CameraGLTest
二十二：抓起tcpdump資訊，tcpdump -i any -p -s 0 -w /sdcard/pcap.pcap
二十三：防止OOM程式碼
public static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(res, resId, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeResource(res, resId, options);
}
二十四：檢視總記憶體資訊：cat proc/meminfo
二十五：特殊符合表示
＋－×÷
Java中使用+\u2212\u00d7\u00f7表示
二十六：使用命名合patch.
你現在有一個code base： small-src, 你的patch檔案放在~/patch/0001-trival-patch.patch
cd small-src
git-am ~/patch/0001-trival-patch.patch
二十七：抓起視訊DUMP
1.Dump bit steam and outout yuv data
please run the below command before you test.
adb shell
// dump output yuv
setprop vidc.dec.log.out 1
//dump bit stream
setprop vidc.dec.log.in 1
You shall have the write permission in /data/misc/media
You will find the bitsteam and yuv data on /data/misc/media
2.Enable log.
please run the below command before you test.
a).Enable the omx debug
adb shell setprop vidc.debug.level 7
b.Enable the kernel log
adb shell
su
cd /d/msm_vidc
echo 0x1003 > debug_level
echo 0x3F > fw_level
二十八：命令輸入字串到Edittext裡面
adb shell input text asdfsff
直接列印Arrays.toString(陣列名) 即可。