android屏幕定位示例

本文概述

  • Android纵向和横向模式屏幕方向示例
screenOrientation是活动元素的属性。 android活动的方向可以是纵向,横向,传感器,未指定等。你需要在AndroidManifest.xml文件中对其进行定义。
句法:
< activity android:name="package_name.Your_ActivityName" android:screenOrientation="orirntation_type"> < /activity>

例:
< activity android:name=" example.srcmini.com.screenorientation.MainActivity" android:screenOrientation="portrait"> < /activity>

< activity android:name=".SecondActivity" android:screenOrientation="landscape"> < /activity>

screenOrientation属性的常用值如下:
描述
unspecified它是默认值。在这种情况下, 系统将选择方向。
portrait高不宽
landscape宽不高
sensor方向由设备方向传感器确定。
Android纵向和横向模式屏幕方向示例在此示例中,我们将创建两个不同屏幕方向的活动。第一个活动(MainActivity)将作为“纵向”方向,第二个活动(SecondActivity)将作为“横向”方向类型。
activity_main.xml
< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="example.srcmini.com.screenorientation.MainActivity">< Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginTop="112dp" android:onClick="onClick" android:text="Launch next activity" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.612" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/editText1" app:layout_constraintVertical_bias="0.613" />< TextView android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="124dp" android:ems="10" android:textSize="22dp" android:text="This activity is portrait orientation" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.502" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < /android.support.constraint.ConstraintLayout>

活动类
package example.srcmini.com.screenorientation; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity {Button button1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1=(Button)findViewById(R.id.button1); } public void onClick(View v) { Intent intent = new Intent(MainActivity.this, SecondActivity.class); startActivity(intent); } }

activity_second.xml
< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="example.srcmini.com.screenorientation.SecondActivity">< TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="180dp" android:text="this is landscape orientation" android:textSize="22dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.502" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < /android.support.constraint.ConstraintLayout>

SecondActivity类
package example.srcmini.com.screenorientation; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class SecondActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); } }

AndroidManifest.xml【android屏幕定位示例】在AndroidManifest.xml文件中,在活动中添加screenOrientation属性并提供其方向。在此示例中,我们为MainActivity提供“纵向”方向,为SecondActivity提供“横向”方向。
< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas.android.com/apk/res/android" package="example.srcmini.com.screenorientation">< application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> < activity android:name="example.srcmini.com.screenorientation.MainActivity" android:screenOrientation="portrait"> < intent-filter> < action android:name="android.intent.action.MAIN" />< category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < activity android:name=".SecondActivity" android:screenOrientation="landscape"> < /activity> < /application>< /manifest>

输出:
android屏幕定位示例

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android屏幕定位示例

文章图片

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