所谓隐式意图就是在意图激活Activity、Service或BroadcastReceiver这三类组件时,并不显示指出需要显示指出主键的名字,而是通过指定action,data,category,Android系统会根据这三个特征找到最合适的组件并激活。先看自定义的例子
- <application android:icon="@drawable/icon" android:label="@string/app_name">
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<activity android:name=".MainActivity"
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android:label="@string/app_name">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<activity android:name=".OtherActivity1" android:label="@string/app_name">
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<intent-filter>
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<action android:name="cn.xy.action" />
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<category android:name="android.intent.category.DEFAULT"></category>
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</intent-filter>
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</activity>
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<activity android:name=".OtherActivity2" android:label="@string/app_name">
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<intent-filter>
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<action android:name="cn.xy.action2" />
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<action android:name="cn.xy2.action2" />
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<category android:name="cn.xy.category2"></category>
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<category android:name="cn.xy2.category2"></category>
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<category android:name="android.intent.category.DEFAULT"></category>
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</intent-filter>
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</activity>
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<activity android:name=".OtherActivity3" android:label="@string/app_name">
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<intent-filter>
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<action android:name="cn.xy.action3" />
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<category android:name="cn.xy.category3"></category>
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<data android:scheme="xy" android:host="www.xy.cn" android:path="/xy"></data>
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<category android:name="android.intent.category.DEFAULT"></category>
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</intent-filter>
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</activity>
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<activity android:name=".OtherActivity4" android:label="@string/app_name">
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<intent-filter>
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<action android:name="cn.xy.action4" />
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<category android:name="cn.xy.category4"></category>
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<data android:scheme="xy" android:host="www.xy.cn"></data>
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<data android:mimeType="image/*"/>
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<category android:name="android.intent.category.DEFAULT"></category>
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</intent-filter>
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</activity>
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</application>
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public class MainActivity extends Activity
- {
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@Override
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public void onCreate(Bundle savedInstanceState)
- {
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super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- }
-
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public void goActivity1(View v)
- {
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Intent intent = new Intent();
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intent.setAction("cn.xy.action");
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this.startActivity(intent);
- }
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public void goActivity2(View v)
- {
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Intent intent = new Intent();
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intent.setAction("cn.xy.action2");
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intent.addCategory("cn.xy.category2");
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this.startActivity(intent);
- }
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public void goActivity3(View v)
- {
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Intent intent = new Intent();
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intent.setAction("cn.xy.action3");
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intent.addCategory("cn.xy.category3");
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intent.setData(Uri.parse("xy://www.xy.cn/xy"));
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this.startActivity(intent);
- }
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public void goActivity4(View v)
- {
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Intent intent = new Intent();
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intent.setAction("cn.xy.action4");
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intent.addCategory("cn.xy.category4");
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intent.setDataAndType(Uri.parse("xy://www.xy.cn/xxx"), "image/gif");
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this.startActivity(intent);
- }
- }
看一个系统intent的例子,我们在应用中比如要实现拨打电话
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public void onClick(View v)
- {
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- String phone = txtPhone.getText().toString();
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Intent intent = new Intent();
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intent.setAction("android.intent.action.CALL");
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intent.setData(Uri.parse("tel:" + phone));
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- startActivity(intent);
- }
本文转自IT徐胖子的专栏博客51CTO博客,原文链接http://blog.51cto.com/woshixy/1096171如需转载请自行联系原作者
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