继续今天的Android，经过昨天大体了解了Android开发的一些基本文件结构，今天来做一个电话拨号器！
预期达到的效果
实现过程
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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>
接着在activity_main.xml新建输入文本框,添加特殊的id属性android:id="@+id/et_number"，这里‘+’表示动态向R文件添加一个静态的内部类id，然后在R文件中动态的添加了一个et_number,以便后面进行操作
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<EditText
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:numeric="integer"
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android:lines = "1"
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android:hint="@string/hint"
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android:id="@+id/et_number"
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/>
其中在<EditText/>文本框下添加限制只能输入一行并且全部为数字的字符
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android:numeric="integer"
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android:lines = "1"
接下来处理按钮点击事件
在MainActivity中添加this.findViewById(R.id.bt_dail);就能找到该按钮，它返回的其实是一个view，继承关系是button继承自TextView，TextView又继承自View
注册MainActivity的tag
public static final String tag = "MainActivity";
添加点击事件
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Button button = (Button)this.findViewById(R.id.bt_dail);
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button.setOnClickListener((OnClickListener) new MyButtonClickListener());
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privateclass MyButtonClickListener implements OnClickListener
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{
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@Override
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publicvoid onClick(View v) {
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// TODO Auto-generated method stub
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System.out.println("按钮被点击了");
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Log.i(tag, "button被点击了");
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Log.e(tag, "error");
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Log.d(tag, "debug");
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Log.v(tag,"verbios");
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Log.w(tag, "warm");
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}
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}
点击按钮会在Log日志中会输对应的日志
然后实现拨打电话的功能
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privateclass MyButtonClickListener implements OnClickListener
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{
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@Override
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publicvoid onClick(View v) {
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// TODO Auto-generated method stub
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//拿到电话号码
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EditText mEditText = (EditText)MainActivity.this.findViewById(R.id.et_number);
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String number = mEditText.getText().toString();
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Log.i(tag, number);
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//拨打电话号码
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Intent intent = new Intent();//意图 代表一个要执行动作的意图
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//拨打动作 110
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intent.setAction(Intent.ACTION_CALL);//Intent.ACTION_DAL是拨号的操作
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//输入的话就拨打输入的，不属于的话就拨打作者的号码
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if(!"".equals(number))
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{
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intent.setData(Uri.parse("tel:"+number));
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}
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else
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{
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Log.i(tag, "我的号码");
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intent.setData(Uri.parse("tel:"+"13262983383"));
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}
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//激活意图
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startActivity(intent);
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}
到目前为止代码是差不多了点击运行，会发现报错了
我们来查看权限错误的Log日志
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04-0911:31:19.945: E/AndroidRuntime(516): <span style="color:#ff0000;">java.lang.SecurityException: Permission Denial</span>: starting Intent { act=android.intent.action.CALL dat=tel:110 cmp=com.android.phone/.OutgoingCallBroadcaster } from ProcessRecord{45ec9830 516:com.example.phonecall/10038} (pid=516, uid=10038) requires android.permission.CALL_PHONE
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04-0911:31:19.945: E/AndroidRuntime(516): at android.os.Parcel.readException(Parcel.java:1247)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.os.Parcel.readException(Parcel.java:1235)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1298)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1373)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.app.Activity.startActivityForResult(Activity.java:2817)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.app.Activity.startActivity(Activity.java:2923)
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04-0911:31:19.945: E/AndroidRuntime(516): at com.example.phonecall.MainActivity$MyButtonClickListener.onClick(MainActivity.java:45)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.view.View.performClick(View.java:2408)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.view.View$PerformClick.run(View.java:8816)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.os.Handler.handleCallback(Handler.java:587)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.os.Handler.dispatchMessage(Handler.java:92)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.os.Looper.loop(Looper.java:123)
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04-0911:31:19.945: E/AndroidRuntime(516): at android.app.ActivityThread.main(ActivityThread.java:4627)
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04-0911:31:19.945: E/AndroidRuntime(516): at java.lang.reflect.Method.invokeNative(Native Method)
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04-0911:31:19.945: E/AndroidRuntime(516): at java.lang.reflect.Method.invoke(Method.java:521)
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04-0911:31:19.945: E/AndroidRuntime(516): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
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04-0911:31:19.945: E/AndroidRuntime(516): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
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04-0911:31:19.945: E/AndroidRuntime(516): at dalvik.system.NativeStart.main(Native Method)
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java.lang.SecurityException: Permission Denial
解决办法，添加权限
找到ANdroidManifest.xml清单文件，找到Permissions
Add->android.permission.CALL_PHONE_CALL
