Question

通过搜索栏我调整了textview的大小，是否可以保存调整大小的textview with sharedpreferences，以及重新打开活动时调整大小的TextView？

MainActivity.java

公共类MainActivity扩展了AppCompatActivity {

TextView txt;
SeekBar skb;
Button btn;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    //SharedPreferences ??





    txt = (TextView) findViewById(R.id.txt);

    skb = (SeekBar) findViewById(R.id.skb);
    skb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            android.view.ViewGroup.LayoutParams layoutParams = txt.getLayoutParams();
            layoutParams.height = progress;
            layoutParams.width = progress;
            txt.setLayoutParams(layoutParams);

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });


    btn = (Button) findViewById(R.id.btn);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            //?????

        }
    });
}

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.gela.myapplication111.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:background="@color/colorAccent"
        android:id="@+id/txt"
        android:gravity="center"
        android:textStyle="bold" />

    <SeekBar
        android:layout_width="250dp"
        android:layout_height="wrap_content"
        android:id="@+id/skb"
        android:layout_marginBottom="64dp"
        android:max="250"
        android:indeterminate="false"
        android:layout_above="@+id/btn"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SAVE"
        android:id="@+id/btn"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="23dp" />
</RelativeLayout>

Answer 1

只需保存新的高度和宽度

        preferenceEditor = sharedpreferences.edit();
    preferenceEditor.putString("height",progress);
    preferenceEditor.putString("widht",progress);
    preferenceEditor.commit();

在onCreate（）

中阅读....

       int width = sharedpreferences.getInt("width",10);
    int height = sharedpreferences.getInt("height",10);

Answer 2

这里有一些例子

用于存储值：

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        android.view.ViewGroup.LayoutParams layoutParams = txt.getLayoutParams();
        layoutParams.height = progress;
        layoutParams.width = progress;
        txt.setLayoutParams(layoutParams);
        SharedPreferences preferences = 
            PreferenceManager.getDefaultSharedPreferences(context);
        SharedPreferences.Editor editor = sharedpreferences.edit()
        editor.putInt("progress", progress).commit();
    }

用于检索和设置：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    txt = (TextView) findViewById(R.id.txt);

    SharedPreferences preferences = 
            PreferenceManager.getDefaultSharedPreferences(context);
    int progress = preferences.getInt("progress");

    android.view.ViewGroup.LayoutParams layoutParams = txt.getLayoutParams();
    layoutParams.height = progress;
    layoutParams.width = progress;
    txt.setLayoutParams(layoutParams);

        ...

如何通过SharedPreferences保存调整大小的textview？

2 个答案: