显式意图：调用Intent.setComponent()、Intent.setClass()、Intent.setClassName()方法明确指定了组件名的Intent为显式意图，显式意图明确指定了Intent应该传递给哪个组件。
隐式意图：没有明确指定组件名的Intent为隐式意图。 Android系统会根据隐式意图中设置的动作(action)、类别(category)、数据（URI和数据类型）找到最合适的组件来处理这个意图。
MainActivity.java
package cn.android.intent;
import java.util.Date;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.TextView;
public class NewActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.other);
Intent intent = getIntent();
//Log.i("NewActivity", intent.getData().getPath());
String title = intent.getStringExtra("title");
double since = intent.getDoubleExtra("since", 1995.5);
TextView textView = (TextView) this.findViewById(R.id.textView);
textView.setText("语言：" + title + "，发布时间：" + since + "。");
}
public void closeActivity(View v) {
Intent intent = new Intent();
intent.putExtra("result", new Date().toString());
setResult(501, intent);
this.finish();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
closeActivity(null);
}
return true;
}
}
NewActivity.java
package cn.android.intent;
import java.util.Date;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.TextView;
public class NewActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.other);
Intent intent = getIntent();
//Log.i("NewActivity", intent.getData().getPath());
String title = intent.getStringExtra("title");
double since = intent.getDoubleExtra("since", 1995.5);
TextView textView = (TextView) this.findViewById(R.id.textView);
textView.setText("语言：" + title + "，发布时间：" + since + "。");
}
public void closeActivity(View v) {
Intent intent = new Intent();
intent.putExtra("result", new Date().toString());
setResult(501, intent);
this.finish();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
closeActivity(null);
}
return true;
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
android:id="@+id/textView" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:gravity="center_horizontal"
android:layout_below="@id/textView">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_display"
android:id="@+id/buttonDisplay"
android:onClick="openActivityDisplay" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_hidden"
android:onClick="openActivityHidden" />
</LinearLayout>
</RelativeLayout>
other.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TableRow>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/newActivity"
android:id="@+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_close"
android:onClick="closeActivity" />
</TableRow>
</TableLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.android.intent"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".MainActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".NewActivity" android:label="@string/newActivity">
<intent-filter>
<action android:name="cn.java.action.android" />
<action android:name="cn.java.action.windowsphone" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="cn.java.category.intent" />
<category android:name="cn.java.category.action" />
<data android:scheme="intent" android:host="www.android.com" />
<data android:mimeType="image/*" />
</intent-filter>
</activity>
</application>
</manifest>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainActivity!</string>
<string name="newActivity">New Activity!</string>
<string name="app_name">Android意图</string>
<string name="button_display">打开显示意图</string>
<string name="button_hidden">打开隐式意图</string>
<string name="button_close">关闭窗口</string>
</resources>