Android Studio 屏幕方向以及UI界面状态的保存 _UI界面

古人学问无遗力，少壮工夫老始成。这篇文章主要讲述Android Studio 屏幕方向以及UI界面状态的保存相关的知识，希望能为你提供帮助。

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 { /* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 本实例主要学习，屏幕翻转时，界面如何自适应，创建横屏布局 1.禁止切换横屏：在 AndroidManifest.xml--> application-> activity-> 中设置如下代码（android:screenOrientation="portrait"） < activity android:name=".MainActivity" android:screenOrientation="portrait" > 2. 创建 Landscape 布局，横屏时，会自动加载 Landscape 的布局界面（清单文件中，注意去掉 android:screenOrientation="portrait" ） 3. 翻转屏幕时，保存窗口控件的状态值; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */ 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中的值不为空，如果有相应的这个组件的值，则读取出来赋值上去 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 //将 textView 中的值，先保存到 outState 中（键值对） public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString("key",textView.getText().toString()); } }

【Android Studio 屏幕方向以及UI界面状态的保存】项目：Orientation