{"id":6414,"date":"2022-02-10T15:56:56","date_gmt":"2022-02-10T07:56:56","guid":{"rendered":"https:\/\/www.wangonc.com\/?p=6414"},"modified":"2024-03-01T15:24:04","modified_gmt":"2024-03-01T07:24:04","slug":"basic-usage-of-activities","status":"publish","type":"post","link":"https:\/\/www.wangonc.com\/index.php\/2022\/02\/10\/basic-usage-of-activities\/","title":{"rendered":"\u6d3b\u52a8\u7684\u57fa\u672c\u7528\u6cd5"},"content":{"rendered":"

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\n

\u663e\u793a\u65f6\u95f4\u6709Toast.LENGTH_LONG\u548cToast.KENGTH_SHORT\u4e24\u79cd<\/p>\n<\/blockquote>\n

2\u3001\u4f7f\u7528makeText\u7684show\u65b9\u6cd5\u663e\u793a\u5728\u624b\u673a\u4e0a<\/p>\n

3\u3001Snackbar\u662f\u4e00\u79cd\u66f4\u5148\u8fdb\u7684\u6d88\u606f\u6846\uff0c\u4f7f\u7528\u65b9\u6cd5\u548cToast\u7c7b\u4f3c\uff0c\u533a\u522b\u662f\u5728\u9700\u8981\u4f7f\u7528make\u65b9\u6cd5\u521d\u59cb\u5316\uff0c\u9664\u4e86\u6587\u672c\u548c\u65f6\u5e38\u5916\uff0c\u8fd8\u9700\u8981\u4f7f\u7528findViewById\u6765\u9644\u52a0\u4e00\u4e2a\u8bd5\u56fe\uff08\u9700\u8981\u5728\u6587\u4ef6\u6e05\u5355\u4e2d\u7ed9\u60f3\u8981\u9644\u52a0\u7684\u89c6\u56fe\u6dfb\u52a0\u4e00\u4e2aid\uff09<\/p>\n

\n

\u4f8b\u5982Snackbar.make( findViewById( R.id.myCoordinatorLayout ),Hello, Snackbar.LENGTH_SHORT).show()<\/code><\/p>\n<\/blockquote>\n

\u4e8c\u3001Menu\u7684\u57fa\u672c\u6b65\u9aa4<\/h1>\n

1\u3001\u5728\u8d44\u6e90\u4e2d\u65b0\u5efa\u4e00\u6587\u4ef6\u5939\uff0c\u6587\u4ef6\u5939\u4e2d\u65b0\u5efa\u4e00xml\u6587\u4ef6\uff08\u4f8b\u5982res\/menu\/menu.xml\uff09<\/p>\n

2\u3001\u91cd\u5199onCreateOptionMenu\u65b9\u6cd5\uff0c\u6dfb\u52a0getMenuInflater().inflate(R.menu.menu ,menu)<\/code><\/p>\n

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\u4e09\u3001Intent\u7684\u57fa\u672c\u7528\u6cd5<\/h1>\n

1\u3001\u663e\u5f0f\u8c03\u7528<\/p>\n

a\u3001\u6784\u9020\u4f20\u5165\u53c2\u6570<\/p>\n

\n

Intent intent = new Intent(this.SecondActivity.class);
\nstartActivity(intent);<\/p>\n<\/blockquote>\n

b\u3001setClass \/ setClassName\u65b9\u6cd5<\/p>\n

\n

Intent intent = new Intent();
\nintent.setClass(this,SecondActivity.class);
\n\/\/intent.setClassName(this,com.excomple.app.SecondActivity);
\nstartActivity(intent);<\/p>\n<\/blockquote>\n

c\u3001setComponent\u65b9\u6cd5<\/p>\n

\n

Intent intent = new Intent();
\nintent.setComponent(new ComponentName(this.getPackageName(),com.example.message));
\nstartActivity(intent);<\/p>\n<\/blockquote>\n

2\u3001\u9690\u5f0f\u8c03\u7528<\/p>\n

a\u3001\u6784\u9020\u4f20\u5165\u53c2\u6570<\/p>\n

\n

Intent intent = new Intent(Intent.ACTION_CALL_BUTTON);
\nstartActivity(intent);<\/p>\n<\/blockquote>\n

b\u3001setAction\u65b9\u6cd5\uff08\u6216\u5176\u4ed6\u5c5e\u6027\uff09<\/p>\n

\n

Intent intent = new Intent();
\nintent.setAction(Intent.ACTION_VIEW);
\nUri uri=Uri.parse(https:\/\/www.baidu.com<\/a>);
\nintent.setData(uri);
\nstartActivity(intent);<\/p>\n<\/blockquote>\n

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e\u3001\u4f7f\u7528startActivityFoResult\u65b9\u6cd5\u5728\u5f53\u524d\u6d3b\u52a8\u9500\u6bc1\u65f6\u8fd4\u56de\u4e0a\u4e00\u4e2a\u6d3b\u52a8\uff0c\u53c2\u6570\u5206\u522b\u4e3aintent\u548c\u8bf7\u6c42\u7801<\/p>\n

f\u3001\u521d\u59cb\u5316\u4e00\u4e2aIntent\uff0c\u7528putExtra\u65b9\u6cd5\u4f20\u9012\u6570\u636e<\/p>\n

g\u3001\u4f7f\u7528setResult\u65b9\u6cd5\u5411\u4e0a\u4e00\u4e2a\u7a97\u53e3\u8fd4\u56de\u6570\u636e\uff0c\u6709\u4e24\u4e2a\u53c2\u6570\uff0c\u5206\u522b\u662f\u6d3b\u52a8\u5904\u7406\u7ed3\u679c\uff08RESULT_OK\u3001RESULT_CANCELED\u3001RESULT_FIRST_USER\uff09\u548c\u4f20\u9012\u6570\u636e\u7684Intent<\/p>\n

h\u3001\u5728\u4e0a\u4e00\u4e2a\u7a97\u53e3\u91cd\u5199onActivityResult\u65b9\u6cd5\uff0c\u4f7f\u7528getStringExrta\u65b9\u6cd5\u5f97\u5230\u4f20\u9012\u7684\u6570\u636e<\/p>\n

i\u3001\u5982\u679c\u6ce8\u518c\u6309\u94ae\u52a8\u4f5c\u9500\u6bc1\u6d3b\u52a8\uff0c\u5219\u628af\u3001g\u8fc7\u7a0b\u91cd\u5199\u5728\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6onClick\u65b9\u6cd5\u4e2d\uff0c\u5982\u679c\u76f8\u5e94back\u952e\u8fd4\u56de\u4f20\u9012\u6570\u636e\u5219\u628af\u3001g\u8fc7\u7a0b\u91cd\u5199\u5728\u5f53\u524d\u6d3b\u52a8\u7684onBackPressed\u65b9\u6cd5\u4e2d<\/p>\n

\u56db\u3001\u6d3b\u52a8\u7684\u542f\u52a8\u6a21\u5f0f<\/h1>\n

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2\u3001standard\u662f\u9ed8\u8ba4\u7684\u542f\u52a8\u6a21\u5f0f\uff0c\u6bcf\u6b21\u542f\u52a8\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u5b9e\u4f8b<\/p>\n

3\u3001singleTop\u6a21\u5f0f\u5728\u542f\u52a8\u6d3b\u52a8\u65f6\u53d1\u73b0\u8fd4\u56de\u6808\u6808\u9876\u5df2\u7ecf\u662f\u8be5\u6d3b\u52a8\u5219\u4e0d\u4f1a\u91cd\u65b0\u521b\u5efa\u5b9e\u4f8b\uff0c\u4f46\u662f\u6808\u9876\u65f6\u5176\u4ed6\u6d3b\u52a8\u8fd8\u662f\u4f1a\u91cd\u65b0\u521b\u5efa\u5b9e\u4f8b<\/p>\n

4\u3001singleTask\u6a21\u5f0f\u5728\u542f\u52a8\u6d3b\u52a8\u662f\u53d1\u73b0\u6808\u4e2d\u5df2\u7ecf\u5b58\u5728\u8fd9\u4e2a\u6d3b\u52a8\uff0c\u5219\u4f1a\u628a\u8fd9\u4e2a\u6d3b\u52a8\u4e4b\u4e0a\u7684\u6240\u6709\u6d3b\u52a8\u90fd\u51fa\u6808\uff0c\u5982\u679c\u6ca1\u6709\u53d1\u73b0\u5219\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u5b9e\u4f8b<\/p>\n

5\u3001singleInstance\u6a21\u5f0f\u4f1a\u5728\u65b0\u7684\u8fd4\u56de\u6808\u4e2d\u521b\u5efa\u65b0\u5b9e\u4f8b<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e00\u3001Toast\u7684\u57fa\u672c\u6b65\u9aa4 1\u3001\u4f7f\u7528makeText\u65b9\u6cd5\u5b9a\u4e49\u663e\u793a\u6587\u672c\u548c\u663e\u793a\u65f6\u95f4 \u663e\u793a\u65f6\u95f4\u6709Toast.LENGT […]<\/p>\n","protected":false},"author":1,"featured_media":6719,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,10],"tags":[42],"series":[],"class_list":["post-6414","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-study-notes","category-development","tag-android"],"_links":{"self":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/6414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/comments?post=6414"}],"version-history":[{"count":3,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/6414\/revisions"}],"predecessor-version":[{"id":7389,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/6414\/revisions\/7389"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/media\/6719"}],"wp:attachment":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/media?parent=6414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/categories?post=6414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/tags?post=6414"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/series?post=6414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}