Android9.0 判断是否是低内存设备
2020-06-18 本文已影响0人
小二小二小二
ActivityManager.java
/**
* Returns true if this is a low-RAM device. Exactly whether a device is low-RAM
* is ultimately up to the device configuration, but currently it generally means
* something with 1GB or less of RAM. This is mostly intended to be used by apps
* to determine whether they should turn off certain features that require more RAM.
*/
public boolean isLowRamDevice() {
return isLowRamDeviceStatic();
}
/** @hide */
public static boolean isLowRamDeviceStatic() {
return RoSystemProperties.CONFIG_LOW_RAM ||
(Build.IS_DEBUGGABLE && DEVELOPMENT_FORCE_LOW_RAM);
}
读取的系统属性:
public static final boolean CONFIG_LOW_RAM =
SystemProperties.getBoolean("ro.config.low_ram", false);
package com.android.internal.os;
import android.os.SystemProperties;
/**
* This is a cache of various ro.* properties so that they can be read just once
* at class init time.
*/
public class RoSystemProperties {
public static final boolean DEBUGGABLE =
SystemProperties.getInt("ro.debuggable", 0) == 1;
public static final int FACTORYTEST =
SystemProperties.getInt("ro.factorytest", 0);
public static final String CONTROL_PRIVAPP_PERMISSIONS =
SystemProperties.get("ro.control_privapp_permissions");
// ------ ro.config.* -------- //
public static final boolean CONFIG_AVOID_GFX_ACCEL =
SystemProperties.getBoolean("ro.config.avoid_gfx_accel", false);
public static final boolean CONFIG_LOW_RAM =
SystemProperties.getBoolean("ro.config.low_ram", false);
public static final boolean CONFIG_SMALL_BATTERY =
SystemProperties.getBoolean("ro.config.small_battery", false);
// ------ ro.fw.* ------------ //
public static final boolean FW_SYSTEM_USER_SPLIT =
SystemProperties.getBoolean("ro.fw.system_user_split", false);
// ------ ro.crypto.* -------- //
public static final String CRYPTO_STATE = SystemProperties.get("ro.crypto.state");
public static final String CRYPTO_TYPE = SystemProperties.get("ro.crypto.type");
// These are pseudo-properties
public static final boolean CRYPTO_ENCRYPTABLE =
!CRYPTO_STATE.isEmpty() && !"unsupported".equals(CRYPTO_STATE);
public static final boolean CRYPTO_ENCRYPTED =
"encrypted".equalsIgnoreCase(CRYPTO_STATE);
public static final boolean CRYPTO_FILE_ENCRYPTED =
"file".equalsIgnoreCase(CRYPTO_TYPE);
public static final boolean CRYPTO_BLOCK_ENCRYPTED =
"block".equalsIgnoreCase(CRYPTO_TYPE);
public static final boolean CONTROL_PRIVAPP_PERMISSIONS_LOG =
"log".equalsIgnoreCase(CONTROL_PRIVAPP_PERMISSIONS);
public static final boolean CONTROL_PRIVAPP_PERMISSIONS_ENFORCE =
"enforce".equalsIgnoreCase(CONTROL_PRIVAPP_PERMISSIONS);
public static final boolean CONTROL_PRIVAPP_PERMISSIONS_DISABLE =
!CONTROL_PRIVAPP_PERMISSIONS_LOG && !CONTROL_PRIVAPP_PERMISSIONS_ENFORCE;
}