簡(jiǎn)介：
Activity經(jīng)常需要向Fragment進(jìn)行數(shù)據(jù)傳遞,推薦使用fragment.newInstance的方式進(jìn)行數(shù)據(jù)傳遞，以保證界面切換的時(shí)候數(shù)據(jù)不會(huì)丟失。
參考閱讀：Android開(kāi)發(fā)-Fragment和Activity傳值相關(guān)(Fragment傳值給Activity)
步驟一：MainActivity.java文件
packagecom.huwan.activity2fragmentvaluedemo2;
importandroid.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extendsAppCompatActivity {
???// 1.定義了幾個(gè)字符串
???private String aaaa = "字母a值";
???private String bbbb = "字母b值";
???private String cccc = "字母c值";
???@Override
???protected void onCreate(Bundle savedInstanceState) {
???????super.onCreate(savedInstanceState);
???????setContentView(R.layout.activity_main);
???????// 4.點(diǎn)擊進(jìn)行fragment切換
???????Button btn1;
???????Button btn2;
???????Button btn3;
???????btn1 = findViewById(R.id.btn1);
???????btn1.setOnClickListener(new View.OnClickListener() {
???????????@Override
???????????public void onClick(View v) {
???????????????getSupportFragmentManager().beginTransaction().replace(R.id.content_frame,Fragment1.newInstance(aaaa, bbbb)).commit();
???????????}
???????});
???????btn2 = findViewById(R.id.btn2);
???????btn2.setOnClickListener(new View.OnClickListener() {
???????????@Override
???????????public void onClick(View v) {
???????????????getSupportFragmentManager().beginTransaction().replace(R.id.content_frame,Fragment1.newInstance(bbbb, cccc)).commit();
???????????}
???????});
???????btn3 = findViewById(R.id.btn3);
???????btn3.setOnClickListener(new View.OnClickListener() {
???????????@Override
???????????public void onClick(View v) {
???????????????getSupportFragmentManager().beginTransaction().replace(R.id.content_frame,Fragment1.newInstance(aaaa, cccc)).commit();
???????????}
???????});
???????// 2.activity的數(shù)據(jù)可能是傳遞或者獲取的，所以一定要進(jìn)行判斷
???????if (savedInstanceState != null) {
???????????aaaa = savedInstanceState.getString("字母a值");
???????????bbbb = savedInstanceState.getString("字母b值");
???????????cccc = savedInstanceState.getString("字母c值");
???????}
??? }
???// 3.防止數(shù)據(jù)丟失，一定要進(jìn)行保存
???@Override
???protected void onSaveInstanceState(Bundle outState) {
???????super.onSaveInstanceState(outState);
???????outState.putString("字母a值", aaaa);
???????outState.putString("字母b值", bbbb);
???????outState.putString("字母c值", cccc);
??? }
}
步驟二：Fragment1.java文件
packagecom.huwan.activity2fragmentvaluedemo2;
import android.app.Activity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
public class Fragment1 extends Fragment {
???????? //5.獲取傳遞過(guò)來(lái)的值，并保存在bundle中
???????? Stringzhi1;
???????? Stringzhi2;
???????? publicstatic Fragment1 newInstance(String zhi1,String zhi2) {
?????????????????? Fragment1newFragment = new Fragment1();
?????????????????? Bundlebundle = new Bundle();
?????????????????? bundle.putString("zhi1",zhi1);
?????????????????? bundle.putString("zhi2",zhi2);
?????????????????? newFragment.setArguments(bundle);
?????????????????? returnnewFragment;
???????? }
???????? @Override
???????? publicView onCreateView(LayoutInflater inflater, ViewGroup container, BundlesavedInstanceState) {
?????????????????? Viewview = inflater.inflate(R.layout.fragment1, container, false);
?????????????????? //6.將保存的值取出，進(jìn)行展示
?????????????????? Bundleargs = getArguments();
?????????????????? if(args != null){
??????????????????????????? zhi1= args.getString("zhi1");
??????????????????????????? zhi2= args.getString("zhi2");
??????????????????????????? TextViewtext1 = view.findViewById(R.id.text1);
??????????????????????????? text1.setText(zhi1);
??????????????????????????? TextViewtext2 = view.findViewById(R.id.text2);
??????????????????????????? text2.setText(zhi2);
?????????????????? }
?????????????????? returnview;
???????? }
}
步驟三：其它相關(guān)文件
activity_main.xml
???xmlns:tools="http://schemas.android.com/tools"
???android:layout_width="match_parent"
???android:layout_height="match_parent"
???android:orientation="vertical">
???????android:id="@+id/btn1"
???????android:layout_width="wrap_content"
???????android:layout_height="wrap_content"
???????android:textColor="@color/colorAccent"
???????android:textSize="20dp"
???????android:text="切換一" />
???????android:id="@+id/btn2"
???????android:layout_width="wrap_content"
???????android:layout_height="wrap_content"
???????android:textColor="@color/colorAccent"
???????android:textSize="20dp"
???????android:text="切換二" />
???????android:id="@+id/btn3"
???????android:layout_width="wrap_content"
???????android:layout_height="wrap_content"
???????android:textColor="@color/colorAccent"
???????android:textSize="20dp"
???????android:text="切換三" />
???????android:id="@+id/content_frame"
???????android:layout_width="match_parent"
???????android:layout_height="match_parent"
???????android:background="#ff0000"
???????android:fitsSystemWindows="true" />
----------------------------------------------------------------
fragment1.xml
???xmlns:tools="http://schemas.android.com/tools"
???android:layout_width="match_parent"
???android:layout_height="match_parent"
???android:orientation="vertical"
???android:background="@color/colorAccent">
???????android:id="@+id/text1"
???????android:layout_width="wrap_content"
???????android:layout_height="wrap_content"
???????android:textSize="20dp"
???????android:text="值一" />
???????android:id="@+id/text2"
???????android:layout_width="wrap_content"
???????android:layout_height="wrap_content"
???????android:textSize="20dp"
???????android:text="值二"/>
Demo樣例下載：
http://www.huwan.xin/Source/AppPackage/ZIP/Android/
Activity2FragmentValueDemo2.rar
更多內(nèi)容請(qǐng)?jiān)L問(wèn)：www.huwan.xin
