Android Studio 屏幕方向以及UI界面状态的保存
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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()); } }
项目:Orientation
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