{"id":298634,"date":"2024-05-20T16:57:49","date_gmt":"2024-05-20T08:57:49","guid":{"rendered":""},"modified":"2024-05-20T16:58:26","modified_gmt":"2024-05-20T08:58:26","slug":"android-activity-%e5%a6%82%e4%bd%95%e6%95%b0%e6%8d%ae%e4%bc%a0%e9%80%92","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/298634.html","title":{"rendered":"Android Activity \u5982\u4f55\u6570\u636e\u4f20\u9012"},"content":{"rendered":"

\"Android<\/p>\n

Android Activity \u6570\u636e\u4f20\u9012<\/strong>\u7684\u5e38\u89c1\u65b9\u6cd5\u6709\uff1aIntent\u3001Bundle\u3001\u9759\u6001\u53d8\u91cf\u3001\u5168\u5c40\u53d8\u91cf\u3001\u6587\u4ef6\u5171\u4eab\u3001SharedPreferences \u4f7f\u7528\u3001\u6570\u636e\u5e93\u4f7f\u7528<\/strong>\u3002\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0cIntent<\/strong> \u662f\u6700\u5e38\u7528\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5728\u4e0d\u540c\u7ec4\u4ef6\u95f4\u8fdb\u884c\u6570\u636e\u4f20\u9012\uff0c\u5c24\u5176\u662f\u7528\u4e8e Activity \u4e4b\u95f4\u3002Intent \u4e0d\u4ec5\u53ef\u4f20\u9012\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u8fd8\u53ef\u4ee5\u4f20\u9001 Serializable \u53ca Parcelable \u7c7b\u578b\u7684\u5bf9\u8c61\u6570\u636e\u3002<\/p>\n<\/p>\n

\u4e00\u3001INTENT \u4f20\u9012\u6570\u636e<\/h3>\n<\/p>\n

\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u4f20\u9012<\/h4>\n<\/p>\n

Intent \u53ef\u4ee5\u643a\u5e26\u57fa\u672c\u6570\u636e\u7c7b\u578b\u4f5c\u4e3a\u6570\u636e\u4f20\u9012\u548c\u63a5\u6536\u7684\u8f7d\u4f53\u3002\u5728\u6e90 Activity \u4e2d\uff0c\u4f1a\u521b\u5efa\u4e00\u4e2a Intent \u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7 putExtra<\/code> \u65b9\u6cd5\u4f20\u9012\u6570\u636e\uff0c\u4f8b\u5982\u4f20\u9012\u4e00\u4e2a\u5b57\u7b26\u4e32\uff1a<\/p>\n<\/p>\n

Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);<\/p>\n
intent.putExtra("key", "value");<\/p>\n
startActivity(intent);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u76ee\u6807 Activity \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7 getIntent().getStringExtra("key")<\/code> \u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u6570\u636e\uff1a<\/p>\n<\/p>\n
String value = getIntent().getStringExtra("key");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5bf9\u8c61\u7c7b\u578b\u7684\u4f20\u9012<\/h4>\n<\/p>\n
\u5bf9\u8c61\u7c7b\u578b\u4f20\u9012\u9700\u8981\u5b9e\u73b0 Serializable<\/strong> \u6216 Parcelable<\/strong> \u63a5\u53e3\u3002\u800c Parcelable<\/strong> \u6bd4 Serializable<\/strong> \u6027\u80fd\u66f4\u4f18\uff0c\u5728 Android \u4e2d\u66f4\u52a0\u63a8\u8350\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 Parcelable \u4f20\u9012\u5bf9\u8c61\uff1a<\/p>\n<\/p>\n
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);<\/p>\n
MyParcelable parcelableData = new MyParcelable();<\/p>\n
intent.putExtra("parcelable_key", parcelableData);<\/p>\n
startActivity(intent);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u76ee\u6807 Activity \u4e2d\u7684\u63a5\u6536\u65b9\u5f0f\uff1a<\/p>\n<\/p>\n
MyParcelable parcelableData = getIntent().getParcelableExtra("parcelable_key");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001BUNDLE \u4f20\u9012\u6570\u636e<\/h3>\n<\/p>\n
Bundle<\/strong> \u7c7b\u4e5f\u5e38\u7528\u4e8e Activity \u95f4\u6570\u636e\u4f20\u9012\u3002Bundle \u53ef\u4ee5\u770b\u4f5c\u662f\u4e00\u79cd\u5bb9\u5668\uff0c\u7528\u6765\u5b58\u653e\u4f20\u9012\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 Bundle \u4f20\u9012\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/h4>\n<\/p>\n
\u521b\u5efa\u4e00\u4e2a Bundle \u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7 put<\/code> \u65b9\u6cd5\u7cfb\u5217\u6765\u6dfb\u52a0\u6240\u9700\u4f20\u9012\u7684\u6570\u636e\uff0c\u7136\u540e\u5c06 Bundle \u9644\u52a0\u5230 Intent \u4e0a\uff1a<\/p>\n<\/p>\n
Bundle bundle = new Bundle();<\/p>\n
bundle.putString("key", "value");<\/p>\n
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);<\/p>\n
intent.putExtras(bundle);<\/p>\n
startActivity(intent);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u63a5\u6536 Bundle \u4e2d\u7684\u6570\u636e\uff1a<\/p>\n<\/p>\n
Bundle bundle = getIntent().getExtras();<\/p>\n
if(bundle != null){<\/p>\n
    String value = bundle.getString("key");<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528 Bundle \u4f20\u9012\u5bf9\u8c61\u6570\u636e<\/h4>\n<\/p>\n
\u5bf9\u8c61\u5fc5\u987b\u5b9e\u73b0 Parcelable \u6216 Serializable \u63a5\u53e3\u3002\u4ee5 Parcelable \u4e3a\u4f8b\uff1a<\/p>\n<\/p>\n
Bundle bundle = new Bundle();<\/p>\n
bundle.putParcelable("parcelable_key", new MyParcelable());<\/p>\n
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);<\/p>\n
intent.putExtras(bundle);<\/p>\n
startActivity(intent);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u9759\u6001\u53d8\u91cf\u4f20\u9012<\/h3>\n<\/p>\n
\u4f7f\u7528\u9759\u6001\u53d8\u91cf\uff0c\u4e5f\u79f0\u4f5c\u7c7b\u53d8\u91cf\uff0c\u6765\u5b58\u50a8\u548c\u4f20\u9012\u6570\u636e\uff0c\u662f\u4e00\u79cd\u7b80\u5355\u4f46\u5728 Android \u4e2d\u5e76\u4e0d\u63a8\u8350\u7684\u65b9\u5f0f\u3002\u5b83\u76f8\u5f53\u4e8e\u662f\u5168\u5c40\u53d8\u91cf\uff1a<\/p>\n<\/p>\n
public class Common {<\/p>\n
    public static String data = "default_value";<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u6e90 Activity \u8bbe\u7f6e\u503c\uff1a<\/p>\n<\/p>\n
Common.data = "new_value";<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u76ee\u6807 Activity \u83b7\u53d6\u503c\uff1a<\/p>\n<\/p>\n
String value = Common.data;<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u5355\u4f8b\u7c7b\u4f20\u9012<\/h3>\n<\/p>\n
\u5355\u4f8b\u6a21\u5f0f\uff0c\u786e\u4fdd\u4e00\u4e2a\u7c7b\u4ec5\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e2a\u8bbf\u95ee\u5b83\u7684\u5168\u5c40\u8bbf\u95ee\u70b9\u3002<\/p>\n<\/p>\n
public class DataManager {<\/p>\n
    private static final DataManager ourInstance = new DataManager();<\/p>\n
    public static DataManager getInstance() {<\/p>\n
        return ourInstance;<\/p>\n
    }<\/p>\n
    private String data;<\/p>\n
    public String getData() {<\/p>\n
        return data;<\/p>\n
    }<\/p>\n
    public void setData(String data) {<\/p>\n
        this.data = data;<\/p>\n
    }<\/p>\n
    private DataManager() {<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8bbe\u7f6e\u548c\u83b7\u53d6\u6570\u636e\uff1a<\/p>\n<\/p>\n
DataManager.getInstance().setData("Some Data");<\/p>\n
String data = DataManager.getInstance().getData();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u901a\u8fc7\u6587\u4ef6\u5171\u4eab\u4f20\u9012<\/h3>\n<\/p>\n
\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6\u4e2d\uff0c\u5728\u9700\u8981\u7684\u5730\u65b9\u8bfb\u53d6\u51fa\u6765\u3002\u8fd9\u79cd\u65b9\u5f0f\u9002\u7528\u4e8e\u4f20\u9012\u5927\u91cf\u6570\u636e\u548c\u6301\u4e45\u5316\u6570\u636e\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528 SharedPreferences \u4f20\u9012<\/h3>\n<\/p>\n
SharedPreferences \u9002\u7528\u4e8e\u4f20\u9012\u7b80\u5355\u7684\u6570\u636e\uff0c\u5e76\u4e14\u53ef\u4ee5\u6301\u4e45\u5316\u5b58\u50a8\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
\u5199\u5165\u6570\u636e\uff1a<\/p>\n<\/p>\n
SharedPreferences preferences = getSharedPreferences("shared_preferences", MODE_PRIVATE);<\/p>\n
SharedPreferences.Editor editor = preferences.edit();<\/p>\n
editor.putString("key", "value");<\/p>\n
editor.apply();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8bfb\u53d6\u6570\u636e\uff1a<\/p>\n<\/p>\n
SharedPreferences preferences = getSharedPreferences("shared_preferences", MODE_PRIVATE);<\/p>\n
String value = preferences.getString("key", "default_value");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u6570\u636e\u5e93\u4f7f\u7528<\/h3>\n<\/p>\n
\u901a\u8fc7 SQLite \u6570\u636e\u5e93\u8fdb\u884c\u6570\u636e\u5b58\u50a8\u548c\u4f20\u9012\uff0c\u7528\u4e8e\u590d\u6742\u6570\u636e\u7c7b\u578b\u5b58\u50a8\u6216\u5927\u91cf\u6570\u636e\u7684\u60c5\u51b5\u3002\u5e94\u7528\u5185\u4e0d\u540c\u7ec4\u4ef6\u53ef\u4ee5\u5171\u4eab\u6570\u636e\u5e93\u6765\u4ea4\u6362\u6570\u636e\u3002<\/p>\n<\/p>\n
\u521b\u5efa\u548c\u8bbf\u95ee\u6570\u636e\u5e93<\/h4>\n<\/p>\n
\u6570\u636e\u5e93\u7684\u521b\u5efa\u4e00\u822c\u7531 SQLiteOpenHelper \u6d3e\u751f\u7c7b\u5b8c\u6210\uff0c\u901a\u8fc7 getWritableDatabase()<\/code> \u6216 getReadableDatabase()<\/code> \u65b9\u6cd5\u83b7\u53d6\u6570\u636e\u5e93\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n
\u63d2\u5165\u6570\u636e\uff1a<\/p>\n<\/p>\n
ContentValues values = new ContentValues();<\/p>\n
values.put("column", "value");<\/p>\n
db.insert("table_name", null, values);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u67e5\u8be2\u6570\u636e\uff1a<\/p>\n<\/p>\n
Cursor cursor = db.query("table_name", new String[]{"column"}, null, null, null, null, null);<\/p>\n
if(cursor != null && cursor.moveToFirst()){<\/p>\n
    \/\/ process the data<\/p>\n
}<\/p>\n
cursor.close();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u603b\u7ed3\u4e00\u4e0b\uff0cActivity\u6570\u636e\u4f20\u9012<\/strong>\u662f Android \u5e94\u7528\u5f00\u53d1\u4e2d\u7684\u4e00\u4e2a\u57fa\u672c\u64cd\u4f5c\u3002\u4e0d\u540c\u7684\u4f20\u9012\u65b9\u5f0f\u9002\u5408\u4e0d\u540c\u7684\u60c5\u666f\uff0c\u5f00\u53d1\u8005\u5e94\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u6cd5\u6765\u4fdd\u8bc1\u5e94\u7528\u7684\u6027\u80fd\u548c\u7528\u6237\u4f53\u9a8c\u3002\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u3001\u5927\u6570\u636e\u91cf\u6216\u8005\u5bf9\u6570\u636e\u6301\u4e45\u5316\u8981\u6c42\u8f83\u9ad8\u7684\u60c5\u51b5\u4e0b\uff0c\u8003\u8651\u4f7f\u7528\u6587\u4ef6\u5171\u4eab\u3001SharedPreferences \u6216\u6570\u636e\u5e93\u4f20\u9012\u3002\u4f46\u901a\u5e38\u60c5\u51b5\u4e0b\uff0cIntent \u548c Bundle \u662f\u5904\u7406 Activity \u6570\u636e\u4f20\u9012\u6700\u4fbf\u6377\u548c\u6700\u5e38\u7528\u7684\u65b9\u6cd5<\/strong>\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. Android Activity\u4e2d\u5982\u4f55\u4f20\u9012\u7b80\u5355\u6570\u636e\uff1f<\/strong><\/p>\n
\u5728Android Activity\u4e4b\u95f4\u4f20\u9012\u7b80\u5355\u6570\u636e\u53ef\u4ee5\u4f7f\u7528Intent\u6765\u5b9e\u73b0\u3002\u53ef\u4ee5\u901a\u8fc7putExtra()\u65b9\u6cd5\u5c06\u6570\u636e\u653e\u5165Intent\u5bf9\u8c61\u4e2d\uff0c\u7136\u540e\u901a\u8fc7startActivity()\u65b9\u6cd5\u542f\u52a8\u76ee\u6807Activity\uff0c\u5e76\u5728\u76ee\u6807Activity\u4e2d\u4f7f\u7528getIntent()\u65b9\u6cd5\u83b7\u53d6\u4f20\u9012\u8fc7\u6765\u7684\u6570\u636e\u3002<\/p>\n
2. Android Activity\u4e2d\u5982\u4f55\u4f20\u9012\u590d\u6742\u6570\u636e\uff1f<\/strong><\/p>\n
\u5982\u679c\u8981\u4f20\u9012\u590d\u6742\u6570\u636e\uff0c\u4f8b\u5982\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6216\u96c6\u5408\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9e\u73b0Serializable\u6216Parcelable\u63a5\u53e3\u6765\u5b9e\u73b0\u6570\u636e\u7684\u4f20\u9012\u3002\u5b9e\u73b0Serializable\u63a5\u53e3\u53ef\u4ee5\u5c06\u5bf9\u8c61\u5e8f\u5217\u5316\u4e3a\u5b57\u8282\u6d41\uff0c\u5728Intent\u4e2d\u4f7f\u7528putExtra()\u65b9\u6cd5\u4f20\u9012\u5b57\u8282\u6d41\uff0c\u7136\u540e\u5728\u76ee\u6807Activity\u4e2d\u901a\u8fc7getSerializableExtra()\u65b9\u6cd5\u83b7\u53d6\u5b57\u8282\u6d41\uff0c\u5e76\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u3002\u5b9e\u73b0Parcelable\u63a5\u53e3\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u4f20\u9012\u5bf9\u8c61\uff0c\u56e0\u4e3a\u5b83\u76f4\u63a5\u4f20\u9012\u5bf9\u8c61\u7684\u5b57\u6bb5\uff0c\u4e0d\u9700\u8981\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u3002<\/p>\n
3. Android Activity\u4e4b\u95f4\u5982\u4f55\u5b9e\u73b0\u53cc\u5411\u6570\u636e\u4f20\u9012\uff1f<\/strong><\/p>\n
\u8981\u5b9e\u73b0Activity\u4e4b\u95f4\u7684\u53cc\u5411\u6570\u636e\u4f20\u9012\uff0c\u53ef\u4ee5\u4f7f\u7528startActivityForResult()\u65b9\u6cd5\u542f\u52a8\u76ee\u6807Activity\uff0c\u5e76\u5728\u76ee\u6807Activity\u4e2d\u4f7f\u7528setResult()\u65b9\u6cd5\u8bbe\u7f6e\u8fd4\u56de\u7ed3\u679c\u3002\u5728\u6e90Activity\u4e2d\u901a\u8fc7onActivityResult()\u65b9\u6cd5\u83b7\u53d6\u8fd4\u56de\u7684\u7ed3\u679c\u6570\u636e\u3002\u901a\u8fc7\u8bbe\u7f6e\u9002\u5f53\u7684resultCode\u6765\u533a\u5206\u4e0d\u540c\u7684\u8fd4\u56de\u7ed3\u679c\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e0d\u540c\u7684\u903b\u8f91\u5904\u7406\u3002\u540c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528Intent\u7684putExtra()\u65b9\u6cd5\u5c06\u9700\u8981\u4f20\u9012\u7684\u6570\u636e\u653e\u5165Intent\u4e2d\uff0c\u8fd9\u6837\u8fd4\u56de\u7ed3\u679c\u65f6\u4e5f\u53ef\u4ee5\u4f20\u9012\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Android Activity \u6570\u636e\u4f20\u9012\u7684\u5e38\u89c1\u65b9\u6cd5\u6709\uff1aIntent\u3001Bundle\u3001\u9759\u6001\u53d8\u91cf\u3001\u5168\u5c40\u53d8\u91cf\u3001\u6587\u4ef6\u5171 […]","protected":false},"author":3,"featured_media":298684,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/298634"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=298634"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/298634\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/298684"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=298634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=298634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=298634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}