08-18 Activity跳转 Button LinearLayout布局 Relative属性

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Activity跳转

![这里写图片描述](http://img.blog.csdn.net/20150818205036745)//**MainActivity**public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button btn=(Button)findViewById(R.id.button);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent=new Intent(getApplicationContext(),Second_Activity.class);                startActivity(intent);            }        });    }    @Override    protected void onStart() {        super.onStart();        Log.d("myApplication", "onStart ");    }    @Override    protected void onRestart() {        super.onRestart();        Log.d("myApplication", "onRestart");    }    @Override    protected void onResume() {        super.onResume();        Log.d("myApplication", "onResume ");    }    @Override    protected void onPause() {        super.onPause();        Log.d("myApplication", "onPause ");    }    @Override    protected void onStop() {        super.onStop();        Log.d("myApplication", "onStop ");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.d("myApplication", "onDestroy ");    }}//**Second_Activity**public class Second_Activity  extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        Log.d("second_activity", "onCreate ");    }    @Override    protected void onStart() {        super.onStart();        Log.d("second_activity", "onStart ");    }    @Override    protected void onResume() {        super.onResume();        Log.d("second_activity", "onResume ");    }    @Override    protected void onPause() {        super.onPause();        Log.d("second_activity", "onPause ");    }    @Override    protected void onStop() {        super.onStop();        Log.d("second_activity", "onStop ");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.d("second_activity", "onDestroy ");    }}//**activity_main**<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/textView" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="第二个界面"        android:id="@+id/button"        android:layout_margin="@dimen/activity_horizontal_margin"        /></RelativeLayout>//**layout_second**<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"></LinearLayout>//**AndroidManifest**<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.administrator.myapplication" >    <application        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <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>        <activity android:name=".Second_Activity"></activity>    </application></manifest>

Button LinearLayout布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <LinearLayout        android:layout_width="match_parent"        android:layout_weight="1"        android:layout_height="0dip"        android:orientation="horizontal">        <Button            android:layout_width="0dip"            android:layout_weight="1"            android:layout_height="match_parent" />        <LinearLayout            android:layout_width="0dip"            android:layout_weight="2"            android:layout_height="match_parent"            android:orientation="vertical">            <Button                android:layout_width="match_parent"                android:layout_weight="1"                android:layout_height="0dip" />            <Button                android:layout_width="match_parent"                android:layout_weight="1"                android:layout_height="0dip" />        </LinearLayout>    </LinearLayout>    <Button        android:layout_width="match_parent"        android:layout_weight="1"        android:layout_height="0dip" />    <LinearLayout        android:layout_width="match_parent"        android:layout_weight="1"        android:layout_height="0dip"        android:orientation="horizontal">        <LinearLayout            android:layout_width="0dip"            android:layout_weight="1"            android:layout_height="match_parent"            android:orientation="vertical">            <Button                android:layout_width="match_parent"                android:layout_weight="1"                android:layout_height="0dip" />            <Button                android:layout_width="match_parent"                android:layout_weight="1"                android:layout_height="0dip" />            <Button                android:layout_width="match_parent"                android:layout_weight="1"                android:layout_height="0dip" />        </LinearLayout>        <Button            android:layout_width="0dip"            android:layout_weight="2"            android:layout_height="match_parent" />    </LinearLayout></LinearLayout>![这里写图片描述](http://img.blog.csdn.net/20150818200123407)

Relative属性

//**margin属性**    不需要加ID<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical" android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:id="@+id/button3" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentRight="true"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerVertical="true"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:layout_alignParentBottom="true"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:layout_alignParentRight="true"/></RelativeLayout>![这里写图片描述](http://img.blog.csdn.net/20150819194847046)//**gravity属性**   需要加ID<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:layout_width="150dp"        android:layout_height="150dp"        android:background="#ff0000"        android:id="@+id/button"        android:layout_centerVertical="true"        android:layout_centerHorizontal="true" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_toLeftOf="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_toRightOf="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@id/button"        android:layout_above="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@id/button"        android:layout_below="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@id/button"        android:layout_alignTop="@id/button"/>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@id/button"        android:layout_alignBottom="@id/button"/></RelativeLayout>![这里写图片描述](http://img.blog.csdn.net/20150818200556857)

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