1## 3.7\. Runtime Compatibility 2 3Device implementations: 4 5* [C-0-1] MUST support the full Dalvik Executable (DEX) format 6and [Dalvik bytecode specification and semantics](https://android.googlesource.com/platform/dalvik/). 7 8* [C-0-2] MUST configure Dalvik runtimes to allocate memory in 9accordance with the upstream Android platform, and as specified by 10the following table. (See [section 7.1.1](#7_1_1_screen_configuration) for 11screen size and screen density definitions.) 12 13* SHOULD use Android RunTime (ART), the reference upstream 14implementation of the Dalvik Executable Format, and the reference 15implementation’s package management system. 16 17* SHOULD run fuzz tests under various modes of execution 18and target architectures to assure the stability of the runtime. Refer to 19[JFuzz](https://android.googlesource.com/platform/art/+/master/tools/dexfuzz/) 20and [DexFuzz](https://android.googlesource.com/platform/art/+/master/tools/dexfuzz/) 21in the Android Open Source Project website. 22 23Note that memory values specified below are considered minimum values and 24device implementations MAY allocate more memory per application. 25 26<table> 27 <tr> 28 <th>Screen Layout</th> 29 <th>Screen Density</th> 30 <th>Minimum Application Memory</th> 31 </tr> 32 <tr> 33 <td rowspan="12">Android Watch</td> 34 <td>120 dpi (ldpi)</td> 35 <td rowspan="3">32MB</td> 36 </tr> 37 <tr> 38 <td>160 dpi (mdpi)</td> 39 </tr> 40 <tr> 41 <td>213 dpi (tvdpi)</td> 42 </tr> 43 <tr> 44 <td>240 dpi (hdpi)</td> 45 <td rowspan="2">36MB</td> 46 </tr> 47 <tr> 48 <td>280 dpi (280dpi)</td> 49 </tr> 50 <tr> 51 <td>320 dpi (xhdpi)</td> 52 <td rowspan="2">48MB</td> 53 </tr> 54 <tr> 55 <td>360 dpi (360dpi)</td> 56 </tr> 57 <tr> 58 <td>400 dpi (400dpi)</td> 59 <td>56MB</td> 60 </tr> 61 <tr> 62 <td>420 dpi (420dpi)</td> 63 <td>64MB</td> 64 </tr> 65 <tr> 66 <td>480 dpi (xxhdpi)</td> 67 <td>88MB</td> 68 </tr> 69 <tr> 70 <td>560 dpi (560dpi)</td> 71 <td>112MB</td> 72 </tr> 73 <tr> 74 <td>640 dpi (xxxhdpi)</td> 75 <td>154MB</td> 76 </tr> 77 <tr> 78 <td rowspan="12">small/normal</td> 79 <td>120 dpi (ldpi)</td> 80 <td rowspan="2">32MB</td> 81 </tr> 82 <tr> 83 <td>160 dpi (mdpi)</td> 84 </tr> 85 <tr> 86 <td>213 dpi (tvdpi)</td> 87 <td rowspan="3">48MB</td> 88 </tr> 89 <tr> 90 <td>240 dpi (hdpi)</td> 91 </tr> 92 <tr> 93 <td>280 dpi (280dpi)</td> 94 </tr> 95 <tr> 96 <td>320 dpi (xhdpi)</td> 97 <td rowspan="2">80MB</td> 98 </tr> 99 <tr> 100 <td>360 dpi (360dpi)</td> 101 </tr> 102 <tr> 103 <td>400 dpi (400dpi)</td> 104 <td>96MB</td> 105 </tr> 106 <tr> 107 <td>420 dpi (420dpi)</td> 108 <td>112MB</td> 109 </tr> 110 <tr> 111 <td>480 dpi (xxhdpi)</td> 112 <td>128MB</td> 113 </tr> 114 <tr> 115 <td>560 dpi (560dpi)</td> 116 <td>192MB</td> 117 </tr> 118 <tr> 119 <td>640 dpi (xxxhdpi)</td> 120 <td>256MB</td> 121 </tr> 122 <tr> 123 <td rowspan="12">large</td> 124 <td>120 dpi (ldpi)</td> 125 <td>32MB</td> 126 </tr> 127 <tr> 128 <td>160 dpi (mdpi)</td> 129 <td>48MB</td> 130 </tr> 131 <tr> 132 <td>213 dpi (tvdpi)</td> 133 <td rowspan="2">80MB</td> 134 </tr> 135 <tr> 136 <td>240 dpi (hdpi)</td> 137 </tr> 138 <tr> 139 <td>280 dpi (280dpi)</td> 140 <td>96MB</td> 141 </tr> 142 <tr> 143 <td>320 dpi (xhdpi)</td> 144 <td>128MB</td> 145 </tr> 146 <tr> 147 <td>360 dpi (360dpi)</td> 148 <td>160MB</td> 149 </tr> 150 <tr> 151 <td>400 dpi (400dpi)</td> 152 <td>192MB</td> 153 </tr> 154 <tr> 155 <td>420 dpi (420dpi)</td> 156 <td>228MB</td> 157 </tr> 158 <tr> 159 <td>480 dpi (xxhdpi)</td> 160 <td>256MB</td> 161 </tr> 162 <tr> 163 <td>560 dpi (560dpi)</td> 164 <td>384MB</td> 165 </tr> 166 <tr> 167 <td>640 dpi (xxxhdpi)</td> 168 <td>512MB</td> 169 </tr> 170 <tr> 171 <td rowspan="12">xlarge</td> 172 <td>120 dpi (ldpi)</td> 173 <td>48MB</td> 174 </tr> 175 <tr> 176 <td>160 dpi (mdpi)</td> 177 <td>80MB</td> 178 </tr> 179 <tr> 180 <td>213 dpi (tvdpi)</td> 181 <td rowspan="2">96MB</td> 182 </tr> 183 <tr> 184 <td>240 dpi (hdpi)</td> 185 </tr> 186 <tr> 187 <td>280 dpi (280dpi)</td> 188 <td>144MB</td> 189 </tr> 190 <tr> 191 <td>320 dpi (xhdpi)</td> 192 <td>192MB</td> 193 </tr> 194 <tr> 195 <td>360 dpi (360dpi)</td> 196 <td>240MB</td> 197 </tr> 198 <tr> 199 <td>400 dpi (400dpi)</td> 200 <td>288MB</td> 201 </tr> 202 <tr> 203 <td>420 dpi (420dpi)</td> 204 <td>336MB</td> 205 </tr> 206 <tr> 207 <td>480 dpi (xxhdpi)</td> 208 <td>384MB</td> 209 </tr> 210 <tr> 211 <td>560 dpi (560dpi)</td> 212 <td>576MB</td> 213 </tr> 214 <tr> 215 <td>640 dpi (xxxhdpi)</td> 216 <td>768MB</td> 217 </tr> 218</table> 219