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這篇文章主要介紹了Android Studio屏幕方向以及UI界面狀態(tài)的示例分析,具有一定借鑒價(jià)值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
項(xiàng)目:Orientation
package com.example.orientation; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { /* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 1.禁止切換橫屏:在 AndroidManifest.xml-->application->activity->中設(shè)置如下代碼(android:screenOrientation="portrait") <activity android:name=".MainActivity" android:screenOrientation="portrait" > 2. 創(chuàng)建 Landscape 布局,橫屏?xí)r,會(huì)自動(dòng)加載 Landscape 的布局界面(清單文件中,注意去掉 android:screenOrientation="portrait" ) 3. 翻轉(zhuǎn)屏幕時(shí),保存窗口控件的狀態(tài)值; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */ Button button; TextView textView; String TAG = "myTag"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button = findViewById(R.id.button ); textView = findViewById(R.id.textView); //如果State中的值不為空,如果有相應(yīng)的這個(gè)組件的值,則讀取出來賦值上去 if(savedInstanceState !=null) { String s = savedInstanceState.getString("key"); textView.setText(s); } button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { textView.setText(button.getText()); } }); } @Override protected void onDestroy() { super.onDestroy(); Log.d(TAG,"onDestroy:"); } @Override //將 textView 中的值,先保存到 outState 中(鍵值對) public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString("key",textView.getText().toString()); } }
擴(kuò)展學(xué)習(xí):
UI界面設(shè)計(jì)
TextView
<TextView android:id="@+id/textview" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="This is a TextView" android:textColor="#00ff00" android:textSize="24sp" />
要想使得文字居中,需要添加屬性android:gravity="center",可選擇的選項(xiàng)還有top、bottom、left、right、center等,center相當(dāng)于center_vertical|center_horizontal。
使用android:textSize="24sp"指定文字大小,android:textColor="#00ff00"指定文字顏色。
Button
<Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Button" android:textAllCaps="false"/>
在Android中,Button上面的文字默認(rèn)英文全部大寫,可以通過設(shè)置android:textAllCaps="false"改變
EditText
<EditText android:id="@+id/edittext" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="HelloWorld" android:maxLength="20" android:maxLines="1" />
通過設(shè)置hint屬性可以得到提示文字,設(shè)置maxLines使得輸入框中最大輸入行數(shù)。
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