Uri uri = Uri.parse("tel:12345678"); 
Intent intent = new Intent(Intent.ACTION_CALL, uri); 
startActivity(intent); 

ERROR/AndroidRuntime: java.lang.SecurityException: Permission Denial:  
starting Intent { act=android.intent.action.CALL dat=tel:12345678 cmp=com.android.phone/.OutgoingCallBroadcaster } 
......  
requires android.permission.CALL_PHONE 

...... 
<uses-permission android:name="android.permission.CALL_PHONE" /> 
...... 
<activity android:name="OutgoingCallBroadcaster" 
        android:permission="android.permission.CALL_PHONE" 
        android:theme="@android:style/Theme.NoDisplay" 
        android:configChanges="orientation|keyboardHidden"> 
      <!-- CALL action intent filters, for the various ways 
         of initiating an outgoing call. --> 
      <intent-filter> 
        <action android:name="android.intent.action.CALL" /> 
        <category android:name="android.intent.category.DEFAULT" /> 
        <data android:scheme="tel" /> 
      </intent-filter> 
      <intent-filter> 
        <action android:name="android.intent.action.CALL" /> 
        <category android:name="android.intent.category.DEFAULT" /> 
        <data android:scheme="voicemail" /> 
      </intent-filter> 
      <intent-filter> 
        <action android:name="android.intent.action.CALL" /> 
        <category android:name="android.intent.category.DEFAULT" /> 
        <data android:mimeType="vnd.android.cursor.item/phone" /> 
        <data android:mimeType="vnd.android.cursor.item/phone_v2" /> 
        <data android:mimeType="vnd.android.cursor.item/person" /> 
      </intent-filter> 
</activity> 
...... 

<application ...> 
... 
</application> 
<uses-permission android:name="android.permission.CALL_PHONE"/> 

package com.scott.phone; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
 
public class MainActivity extends Activity { 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Button btn = (Button) findViewById(R.id.btn); 
    btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        startActivity(new Intent(MainActivity.this, PhoneActivity.class)); 
      } 
    }); 
  } 
} 

package com.scott.phone; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.widget.TextView; 
 
public class PhoneActivity extends Activity { 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    TextView tv = new TextView(this); 
    tv.setText("Yes! It works."); 
    setContentView(tv); 
  } 
} 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
   package="com.scott.phone" 
   android:versionCode="1" 
   android:versionName="1.0"> 
   
  <!-- 声明一个权限 --> 
  <permission android:protectionLevel="normal"  
        android:name="scott.permission.MY_CALL_PHONE"/> 
         
  <application android:icon="@drawable/icon" android:label="@string/app_name"> 
    <activity android:name=".MainActivity" 
         android:label="@string/app_name"> 
      <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 
        <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
    </activity> 
    <!-- 为Activity应用已定义的权限 --> 
    <activity android:name=".PhoneActivity"  
         android:permission="scott.permission.MY_CALL_PHONE"> 
      <intent-filter> 
        <!-- 注意这个action 在其他应用中可使用此action访问此Activity --> 
        <action android:name="scott.intent.action.MY_CALL"/> 
        <category android:name="android.intent.category.DEFAULT" /> 
      </intent-filter> 
    </activity> 
  </application> 
  <!-- 在同一应用中访问PhoneActivity也需要加上权限 --> 
  <uses-permission android:name="scott.permission.MY_CALL_PHONE"/> 
  <uses-sdk android:minSdkVersion="8" /> 
</manifest> 

package com.scott.app; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
 
public class MainActivity extends Activity { 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    Button btn = (Button) findViewById(R.id.btn); 
    btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
        Intent intent = new Intent("scott.intent.action.MY_CALL"); 
        startActivity(intent); 
      } 
    }); 
  } 
} 

<application ...> 
... 
</application> 
<uses-permission android:name="scott.permission.MY_CALL_PHONE"/>