{"id":806,"date":"2015-06-24T11:38:26","date_gmt":"2015-06-24T03:38:26","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=806"},"modified":"2026-08-15T16:49:07","modified_gmt":"2026-08-15T08:49:07","slug":"activity%e7%9a%84%e5%9b%9b%e7%a7%8dlaunchmode","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=806","title":{"rendered":"Activity\u7684\u56db\u79cdlaunchMode"},"content":{"rendered":"

\"\"<\/a><\/p>\n

\u6211\u4eec\u4eca\u5929\u8981\u8bb2\u7684\u662fActivity\u7684\u56db\u79cdlaunchMode\u3002
\nlaunchMode\u5728\u591a\u4e2aActivity\u8df3\u8f6c\u7684\u8fc7\u7a0b\u4e2d\u626e\u6f14\u7740\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5b83\u53ef\u4ee5\u51b3\u5b9a\u662f\u5426\u751f\u6210\u65b0\u7684Activity\u5b9e\u4f8b\uff0c\u662f\u5426\u91cd\u7528\u5df2\u5b58\u5728\u7684Activity\u5b9e\u4f8b\uff0c\u662f\u5426\u548c\u5176\u4ed6Activity\u5b9e\u4f8b\u516c\u7528\u4e00\u4e2atask\u91cc\u3002\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0btask\u7684\u6982\u5ff5\uff0ctask\u662f\u4e00\u4e2a\u5177\u6709\u6808\u7ed3\u6784\u7684\u5bf9\u8c61\uff0c\u4e00\u4e2atask\u53ef\u4ee5\u7ba1\u7406\u591a\u4e2aActivity\uff0c\u542f\u52a8\u4e00\u4e2a\u5e94\u7528\uff0c\u4e5f\u5c31\u521b\u5efa\u4e00\u4e2a\u4e0e\u4e4b\u5bf9\u5e94\u7684task\u3002
\nActivity\u4e00\u5171\u6709\u4ee5\u4e0b\u56db\u79cdlaunchMode\uff1a
\n

1.standard
\n2.singleTop
\n3.singleTask
\n4.singleInstance<\/div>
\n\u6211\u4eec\u53ef\u4ee5\u5728AndroidManifest.xml\u914d\u7f6e\u7684android:launchMode\u5c5e\u6027\u4e3a\u4ee5\u4e0a\u56db\u79cd\u4e4b\u4e00\u5373\u53ef\u3002
\n\u4e0b\u9762\u6211\u4eec\u7ed3\u5408\u5b9e\u4f8b\u4e00\u4e00\u4ecb\u7ecd\u8fd9\u56db\u79cdlanchMode\uff1a<\/p>\n

1.standard<\/strong><\/span>
\nstandard\u6a21\u5f0f\u662f\u9ed8\u8ba4\u7684\u542f\u52a8\u6a21\u5f0f\uff0c\u4e0d\u7528\u4e3a\u914d\u7f6eandroid:launchMode\u5c5e\u6027\u5373\u53ef\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u6307\u5b9a\u503c\u4e3astandard\u3002
\n\u6211\u4eec\u5c06\u4f1a\u4e00\u4e2aActivity\uff0c\u547d\u540d\u4e3aFirstActivity\uff0c\u6765\u6f14\u793a\u4e00\u4e0b\u6807\u51c6\u7684\u542f\u52a8\u6a21\u5f0f\u3002FirstActivity\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n

[java]package com.scott.launchmode;  \n\nimport android.app.Activity;\nimport android.content.Intent;\nimport android.os.Bundle;\nimport android.view.View;\nimport android.widget.Button;\nimport android.widget.TextView;  \n\npublic class FirstActivity extends Activity {\n    @Override\n    public void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.first);\n        TextView textView = (TextView) findViewById(R.id.textView);\n        textView.setText(this.toString());\n        Button button = (Button) findViewById(R.id.button);\n        button.setOnClickListener(new View.OnClickListener() {\n            @Override\n            public void onClick(View v) {\n                Intent intent = new Intent(FirstActivity.this, FirstActivity.class);\n                startActivity(intent);\n            }\n        });\n    }\n}  [\/java]<\/pre>\n
\u6211\u4eecFirstActivity\u754c\u9762\u4e2d\u7684TextView\u7528\u4e8e\u663e\u793a\u5f53\u524dActivity\u5b9e\u4f8b\u7684\u5e8f\u5217\u53f7\uff0cButton\u7528\u4e8e\u8df3\u8f6c\u5230\u4e0b\u4e00\u4e2aFirstActivity\u754c\u9762\u3002
\n\u7136\u540e\u6211\u4eec\u8fde\u7eed\u70b9\u51fb\u51e0\u6b21\u6309\u94ae\uff0c\u5c06\u4f1a\u51fa\u73b0\u4e0b\u9762\u7684\u73b0\u8c61\uff1a<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\u6211\u4eec\u6ce8\u610f\u5230\u90fd\u662fFirstActivity\u7684\u5b9e\u4f8b\uff0c\u4f46\u5e8f\u5217\u53f7\u4e0d\u540c\uff0c\u5e76\u4e14\u6211\u4eec\u9700\u8981\u8fde\u7eed\u6309\u540e\u9000\u952e\u4e24\u6b21\uff0c\u624d\u80fd\u56de\u5230\u7b2c\u4e00\u4e2aFristActivity\u3002standard\u6a21\u5f0f\u7684\u539f\u7406\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
\u5982\u56fe\u6240\u793a\uff0c\u6bcf\u6b21\u8df3\u8f6c\u7cfb\u7edf\u90fd\u4f1a\u5728task\u4e2d\u751f\u6210\u4e00\u4e2a\u65b0\u7684FirstActivity\u5b9e\u4f8b\uff0c\u5e76\u4e14\u653e\u4e8e\u6808\u7ed3\u6784\u7684\u9876\u90e8\uff0c\u5f53\u6211\u4eec\u6309\u4e0b\u540e\u9000\u952e\u65f6\uff0c\u624d\u80fd\u770b\u5230\u539f\u6765\u7684FirstActivity\u5b9e\u4f8b\u3002
\n\u8fd9\u5c31\u662fstandard\u542f\u52a8\u6a21\u5f0f\uff0c\u4e0d\u7ba1\u6709\u6ca1\u6709\u5df2\u5b58\u5728\u7684\u5b9e\u4f8b\uff0c\u90fd\u751f\u6210\u65b0\u7684\u5b9e\u4f8b\u3002<\/p>\n
2.singleTop<\/strong><\/span>
\n\u6211\u4eec\u5728\u4e0a\u9762\u7684\u57fa\u7840\u4e0a\u4e3a\u6307\u5b9a\u5c5e\u6027android:launchMode=”singleTop”\uff0c\u7cfb\u7edf\u5c31\u4f1a\u6309\u7167singleTop\u542f\u52a8\u6a21\u5f0f\u5904\u7406\u8df3\u8f6c\u884c\u4e3a\u3002\u6211\u4eec\u91cd\u590d\u4e0a\u9762\u51e0\u4e2a\u52a8\u4f5c\uff0c\u5c06\u4f1a\u51fa\u73b0\u4e0b\u9762\u7684\u73b0\u8c61\uff1a<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\u6211\u4eec\u770b\u5230\u8fd9\u4e2a\u7ed3\u679c\u8ddfstandard\u6709\u6240\u4e0d\u540c\uff0c\u4e09\u4e2a\u5e8f\u5217\u53f7\u662f\u76f8\u540c\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u4f7f\u7528\u7684\u90fd\u662f\u540c\u4e00\u4e2aFirstActivity\u5b9e\u4f8b\uff1b\u5982\u679c\u6309\u4e00\u4e0b\u540e\u9000\u952e\uff0c\u7a0b\u5e8f\u7acb\u5373\u9000\u51fa\uff0c\u8bf4\u660e\u5f53\u524d\u6808\u7ed3\u6784\u4e2d\u53ea\u6709\u4e00\u4e2aActivity\u5b9e\u4f8b\u3002singleTop\u6a21\u5f0f\u7684\u539f\u7406\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
\u6b63\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u8df3\u8f6c\u65f6\u7cfb\u7edf\u4f1a\u5148\u5728\u6808\u7ed3\u6784\u4e2d\u5bfb\u627e\u662f\u5426\u6709\u4e00\u4e2aFirstActivity\u5b9e\u4f8b\u6b63\u4f4d\u4e8e\u6808\u9876\uff0c\u5982\u679c\u6709\u5219\u4e0d\u518d\u751f\u6210\u65b0\u7684\uff0c\u800c\u662f\u76f4\u63a5\u4f7f\u7528\u3002\u4e5f\u8bb8\u670b\u53cb\u4eec\u4f1a\u6709\u7591\u95ee\uff0c\u6211\u53ea\u770b\u5230\u6808\u5185\u53ea\u6709\u4e00\u4e2aActivity\uff0c\u5982\u679c\u662f\u591a\u4e2aActivity\u600e\u4e48\u529e\uff0c\u5982\u679c\u4e0d\u662f\u5728\u6808\u9876\u4f1a\u5982\u4f55\uff1f\u6211\u4eec\u63a5\u4e0b\u6765\u518d\u901a\u8fc7\u4e00\u4e2a\u793a\u4f8b\u6765\u8bc1\u5b9e\u4e00\u4e0b\u5927\u5bb6\u7684\u7591\u95ee\u3002
\n\u6211\u4eec\u518d\u65b0\u5efa\u4e00\u4e2aActivity\u547d\u540d\u4e3aSecondActivity\uff0c\u5982\u4e0b\uff1a<\/p>\n
[java]\npackage com.scott.launchmode;  \n\nimport android.app.Activity;\nimport android.content.Intent;\nimport android.os.Bundle;\nimport android.view.View;\nimport android.widget.Button;\nimport android.widget.TextView;  \n\npublic class SecondActivity extends Activity {\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.second);\n        TextView textView = (TextView) findViewById(R.id.textView);\n        textView.setText(this.toString());\n        Button button = (Button) findViewById(R.id.button);\n        button.setOnClickListener(new View.OnClickListener() {\n            @Override\n            public void onClick(View v) {\n                Intent intent = new Intent(SecondActivity.this, FirstActivity.class);\n                startActivity(intent);\n            }\n        });\n    }\n}  [\/java]<\/pre>\n
\u7136\u540e\u5c06\u4e4b\u524d\u7684FirstActivity\u8df3\u8f6c\u4ee3\u7801\u6539\u4e3a\uff1a<\/p>\n
[java]\nIntent intent = new Intent(FirstActivity.this, SecondActivity.class);\nstartActivity(intent);  [\/java]<\/pre>\n
\u662f\u7684\uff0cFirstActivity\u4f1a\u8df3\u8f6c\u5230SecondActivity\uff0cSecondActivity\u53c8\u4f1a\u8df3\u8f6c\u5230FirstActivity\u3002\u6f14\u793a\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\"\"<\/p>\n
\u6211\u4eec\u770b\u5230\uff0c\u4e24\u4e2aFirstActivity\u7684\u5e8f\u5217\u53f7\u662f\u4e0d\u540c\u7684\uff0c\u8bc1\u660e\u4eceSecondActivity\u8df3\u8f6c\u5230FirstActivity\u65f6\u751f\u6210\u4e86\u65b0\u7684FirstActivity\u5b9e\u4f8b\u3002\u539f\u7406\u56fe\u5982\u4e0b\uff1a<\/p>\n
\"\"<\/p>\n
\u6211\u4eec\u770b\u5230\uff0c\u5f53\u4eceSecondActivity\u8df3\u8f6c\u5230FirstActivity\u65f6\uff0c\u7cfb\u7edf\u53d1\u73b0\u5b58\u5728\u6709FirstActivity\u5b9e\u4f8b,\u4f46\u4e0d\u662f\u4f4d\u4e8e\u6808\u9876\uff0c\u4e8e\u662f\u91cd\u65b0\u751f\u6210\u4e00\u4e2a\u5b9e\u4f8b\u3002
\n\u8fd9\u5c31\u662fsingleTop\u542f\u52a8\u6a21\u5f0f\uff0c\u5982\u679c\u53d1\u73b0\u6709\u5bf9\u5e94\u7684Activity\u5b9e\u4f8b\u6b63\u4f4d\u4e8e\u6808\u9876\uff0c\u5219\u91cd\u590d\u5229\u7528\uff0c\u4e0d\u518d\u751f\u6210\u65b0\u7684\u5b9e\u4f8b\u3002<\/p>\n
3.singleTask<\/strong><\/span>
\n\u5728\u4e0a\u9762\u7684\u57fa\u7840\u4e0a\u6211\u4eec\u4fee\u6539FirstActivity\u7684\u5c5e\u6027android:launchMode=”singleTask”\u3002\u6f14\u793a\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
\"\"\"\"<\/p>\n
\"\"\"\"<\/p>\n
\u6211\u4eec\u6ce8\u610f\u5230\uff0c\u5728\u4e0a\u9762\u7684\u8fc7\u7a0b\u4e2d\uff0cFirstActivity\u7684\u5e8f\u5217\u53f7\u662f\u4e0d\u53d8\u7684\uff0cSecondActivity\u7684\u5e8f\u5217\u53f7\u5374\u4e0d\u662f\u552f\u4e00\u7684\uff0c\u8bf4\u660e\u4eceSecondActivity\u8df3\u8f6c\u5230FirstActivity\u65f6\uff0c\u6ca1\u6709\u751f\u6210\u65b0\u7684\u5b9e\u4f8b\uff0c\u4f46\u662f\u4eceFirstActivity\u8df3\u8f6c\u5230SecondActivity\u65f6\u751f\u6210\u4e86\u65b0\u7684\u5b9e\u4f8b\u3002singleTask\u6a21\u5f0f\u7684\u539f\u7406\u56fe\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
\"\"<\/p>\n
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\n\u8fd9\u5c31\u662fsingleTask\u6a21\u5f0f\uff0c\u5982\u679c\u53d1\u73b0\u6709\u5bf9\u5e94\u7684Activity\u5b9e\u4f8b\uff0c\u5219\u4f7f\u6b64Activity\u5b9e\u4f8b\u4e4b\u4e0a\u7684\u5176\u4ed6Activity\u5b9e\u4f8b\u7edf\u7edf\u51fa\u6808\uff0c\u4f7f\u6b64Activity\u5b9e\u4f8b\u6210\u4e3a\u6808\u9876\u5bf9\u8c61\uff0c\u663e\u793a\u5230\u5e55\u524d\u3002<\/p>\n
4.singleInstance<\/strong><\/span>
\n\u8fd9\u79cd\u542f\u52a8\u6a21\u5f0f\u6bd4\u8f83\u7279\u6b8a\uff0c\u56e0\u4e3a\u5b83\u4f1a\u542f\u7528\u4e00\u4e2a\u65b0\u7684\u6808\u7ed3\u6784\uff0c\u5c06Acitvity\u653e\u7f6e\u4e8e\u8fd9\u4e2a\u65b0\u7684\u6808\u7ed3\u6784\u4e2d\uff0c\u5e76\u4fdd\u8bc1\u4e0d\u518d\u6709\u5176\u4ed6Activity\u5b9e\u4f8b\u8fdb\u5165\u3002
\n\u6211\u4eec\u4fee\u6539FirstActivity\u7684launchMode=”standard”\uff0cSecondActivity\u7684launchMode=”singleInstance”\uff0c\u7531\u4e8e\u6d89\u53ca\u5230\u4e86\u591a\u4e2a\u6808\u7ed3\u6784\uff0c\u6211\u4eec\u9700\u8981\u5728\u6bcf\u4e2aActivity\u4e2d\u663e\u793a\u5f53\u524d\u6808\u7ed3\u6784\u7684id\uff0c\u6240\u4ee5\u6211\u4eec\u4e3a\u6bcf\u4e2aActivity\u6dfb\u52a0\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
[java]\nTextView taskIdView = (TextView) findViewById(R.id.taskIdView);\ntaskIdView.setText("current task id: " + this.getTaskId());  [\/java]<\/pre>\n
\u7136\u540e\u6211\u4eec\u518d\u6f14\u793a\u4e00\u4e0b\u8fd9\u4e2a\u6d41\u7a0b\uff1a<\/p>\n
\"\"\"\"<\/p>\n
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\"\"<\/p>\n
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\"\"<\/p>\n
singleInstance\u542f\u52a8\u6a21\u5f0f\u53ef\u80fd\u662f\u6700\u590d\u6742\u7684\u4e00\u79cd\u6a21\u5f0f\uff0c\u4e3a\u4e86\u5e2e\u52a9\u5927\u5bb6\u7406\u89e3\uff0c\u6211\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5047\u5982\u6211\u4eec\u6709\u4e00\u4e2ashare\u5e94\u7528\uff0c\u5176\u4e2d\u7684ShareActivity\u662f\u5165\u53e3Activity\uff0c\u4e5f\u662f\u53ef\u4f9b\u5176\u4ed6\u5e94\u7528\u8c03\u7528\u7684Activity\uff0c\u6211\u4eec\u628a\u8fd9\u4e2aActivity\u7684\u542f\u52a8\u6a21\u5f0f\u8bbe\u7f6e\u4e3asingleInstance\uff0c\u7136\u540e\u5728\u5176\u4ed6\u5e94\u7528\u4e2d\u8c03\u7528\u3002\u6211\u4eec\u7f16\u8f91ShareActivity\u7684\u914d\u7f6e\uff1a<\/p>\n
[java]\n&lt;activity android:name=".ShareActivity" android:launchMode="singleInstance"&gt;\n    &lt;intent-filter&gt;\n        &lt;action android:name="android.intent.action.MAIN" \/&gt;\n        &lt;category android:name="android.intent.category.LAUNCHER" \/&gt;\n    &lt;\/intent-filter&gt;\n    &lt;intent-filter&gt;\n        &lt;action android:name="android.intent.action.SINGLE_INSTANCE_SHARE" \/&gt;\n        &lt;category android:name="android.intent.category.DEFAULT" \/&gt;\n    &lt;\/intent-filter&gt;\n&lt;\/activity&gt;  [\/java]<\/pre>\n
\u7136\u540e\u6211\u4eec\u5728\u5176\u4ed6\u5e94\u7528\u4e2d\u8fd9\u6837\u542f\u52a8\u8be5Activity\uff1a<\/p>\n
[java]\nIntent intent = new Intent("android.intent.action.SINGLE_INSTANCE_SHARE");\nstartActivity(intent);  [\/java]<\/pre>\n
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\"\"<\/p>\n
\u539f\u6587\u51fa\u5904:Activity\u7684\u56db\u79cdlaunchMode<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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