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我有三個按鈕「紅色」,「綠色」和「保存」和Textview。每當我按下「紅色」或「綠色」按鈕時,Textview背景顏色將會改變。當我按下「保存」按鈕時,我需要將更改的背景顏色保存到共享偏好設置。我需要打開一個活動獲取更改背景顏色。我怎樣才能做到這一點?共享首選項保存Textview背景
佈局/ activity_main
<?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.myexampleeeeeeeeeeeee.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="save"
android:id="@+id/button_save"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="59dp"
android:onClick="onClick" />
<TextView
android:layout_width="150dp"
android:layout_height="100dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textView"
android:background="@drawable/red"
android:gravity="center"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="red"
android:id="@+id/button_red"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="31dp"
android:onClick="onClick" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="green"
android:id="@+id/button_green"
android:layout_alignBottom="@+id/button_red"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="onClick" />
</RelativeLayout>
MainActivity.java
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
Button button_save, button_red, button_green;
TextView textView;
private SharedPreferences prefs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button_save = (Button)findViewById(R.id.button_save);
button_red = (Button)findViewById(R.id.button_red);
button_green = (Button)findViewById(R.id.button_green);
textView = (TextView)findViewById(R.id.textView);
prefs = getPreferences(MODE_PRIVATE);
// what code for this?
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.button_red:
textView.setBackgroundResource(R.drawable.red);
break;
case R.id.button_green:
textView.setBackgroundResource(R.drawable.green);
break;
case R.id.button_save:
prefs = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
//what code for this?
break;
}
}
}
繪製/紅色
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<shape android:shape="rectangle">
<gradient android:startColor="#FF4081" android:centerColor="#FF4081" android:endColor="#FF4081"/>
<corners android:bottomLeftRadius="50dp" android:bottomRightRadius="50dp" android:topLeftRadius="50dp" android:topRightRadius="50dp"/>
<stroke android:width="2dp" android:color="#ffffff" />
<padding android:left="15dp" android:top="2dp" android:right="15dp" android:bottom="2dp"/>
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="rectangle">
<gradient android:startColor="#4D000000" android:centerColor="#4D000000" android:endColor="#4D000000"/>
<corners android:bottomLeftRadius="50dp" android:bottomRightRadius="50dp" android:topLeftRadius="50dp" android:topRightRadius="50dp"/>
<stroke android:width="2dp" android:color="#ffffff" />
<padding android:left="15dp" android:top="2dp" android:right="15dp" android:bottom="2dp"/>
</shape>
</item>
</selector>
繪製/綠色
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<shape android:shape="rectangle">
<gradient android:startColor="#00e676" android:centerColor="#00e676" android:endColor="#00e676"/>
<corners android:bottomLeftRadius="50dp" android:bottomRightRadius="50dp" android:topLeftRadius="50dp" android:topRightRadius="50dp"/>
<stroke android:width="2dp" android:color="#ffffff" />
<padding android:left="15dp" android:top="2dp" android:right="15dp" android:bottom="2dp"/>
</shape>
</item>
<item android:state_pressed="true">
<shape android:shape="rectangle">
<gradient android:startColor="#4D000000" android:centerColor="#4D000000" android:endColor="#4D000000"/>
<corners android:bottomLeftRadius="50dp" android:bottomRightRadius="50dp" android:topLeftRadius="50dp" android:topRightRadius="50dp"/>
<stroke android:width="2dp" android:color="#ffffff" />
<padding android:left="15dp" android:top="2dp" android:right="15dp" android:bottom="2dp"/>
</shape>
</item>
</selector>
在問題中增加了更多的清晰度 – wizzardz