Activity活动的数据传递

Moeyuuko · Apr 1, 2020 · c0004c5 · c0004c5
1 parent 1db89d1
commit c0004c5
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Showing 5 changed files with 117 additions and 4 deletions.
diff --git a/app/build.gradle b/app/build.gradle
@@ -9,7 +9,7 @@ android {
         minSdkVersion 16
         targetSdkVersion 28
         versionCode 1
-        versionName "1.2"
+        versionName "1.3"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }

diff --git a/app/src/main/java/com/example/helloandroid/Main4Activity.java b/app/src/main/java/com/example/helloandroid/Main4Activity.java
@@ -8,13 +8,17 @@
 import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.TextView;
+
+import org.w3c.dom.Text;
 
 public class Main4Activity extends AppCompatActivity {
     private Button button_finish;
     private Button button8;
     private Button button_clearFocus;
     private EditText PutExtra_TextData;
     private EditText Bundle_TextData;
+    private TextView textView_back;
     private String PutExtra_TextData_default_str;
     private String Bundle_TextData_default_str;
 
@@ -84,8 +88,8 @@ public void onClick(View view) {
                 Bundle bundle = new Bundle();
                 bundle.putString("Bundle_Data",Bundle_TextData.getText().toString());
                 intent.putExtras(bundle);
-
-                startActivity(intent);
+                //带返回请求//
+                startActivityForResult(intent,1);
             }
         });
 
@@ -107,4 +111,16 @@ public void onClick(View view) {
             }
         });
     }
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data){
+        super.onActivityResult(requestCode, resultCode, data);
+        if (requestCode == 1){
+            if (resultCode == 1) {
+                textView_back = (TextView) findViewById(R.id.textView_back);
+                textView_back.setText(data.getStringExtra("ExtraData"));
+            }
+        }
+
+    }
+
 }
diff --git a/app/src/main/java/com/example/helloandroid/Main5Activity.java b/app/src/main/java/com/example/helloandroid/Main5Activity.java
@@ -4,21 +4,27 @@
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
 import android.widget.TextView;
 
 public class Main5Activity extends AppCompatActivity {
 
     private TextView PutExtra_textView_get;
     private TextView Bundle_textView_get;
+    private Button Button_re;
+    private EditText EditText_re;
+    private String EditText_re_default_str;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main5);
 
+        //===获取===//
         PutExtra_textView_get = (TextView)findViewById(R.id.PutExtra_textView_get);
         Bundle_textView_get = (TextView)findViewById(R.id.Bundle_textView_get);
-
         //PutExtra//
         Intent intent = getIntent();
         String PutExtra_Data = intent.getStringExtra("PutExtra_Data");
@@ -28,5 +34,37 @@ protected void onCreate(Bundle savedInstanceState) {
         String Bundle_Data = bundle.getString("Bundle_Data");
         Bundle_textView_get.setText(Bundle_Data);
 
+
+        //===返回===//
+        EditText_re = (EditText)findViewById(R.id.EditText_re);
+        EditText_re_default_str = EditText_re.getText().toString();
+        EditText_re.setOnFocusChangeListener(new android.view.View.OnFocusChangeListener(){
+            @Override
+            public void onFocusChange(View view, boolean hasFocus) {
+                if (hasFocus) {
+                    if (EditText_re.getText().toString().equals(EditText_re_default_str)) {
+                        EditText_re.setText(""); //清除
+                    }
+                } else {
+                    if (EditText_re.getText().length()==0) {
+                        EditText_re.setText(EditText_re_default_str);
+                    }
+                }
+            }
+        });
+
+        Button_re = (Button)findViewById(R.id.Button_re);
+
+        Button_re.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                EditText_re.clearFocus();
+                Intent intent = new Intent();
+                intent.putExtra("ExtraData",EditText_re.getText().toString());
+                setResult(1,intent);
+                finish();
+            }
+        });
+
     }
 }
diff --git a/app/src/main/res/layout/activity_main4.xml b/app/src/main/res/layout/activity_main4.xml
@@ -22,6 +22,7 @@
         android:layout_width="300dp"
         android:layout_height="45dp"
         android:ems="10"
+        android:gravity="center"
         android:inputType="textPersonName"
         android:text="putExtra()的传递数据"
         app:layout_constraintBottom_toBottomOf="parent"
@@ -35,6 +36,7 @@
         android:layout_width="300dp"
         android:layout_height="wrap_content"
         android:ems="10"
+        android:gravity="center"
         android:inputType="textPersonName"
         android:text="Bundle对象的传递数据"
         app:layout_constraintEnd_toEndOf="parent"
@@ -81,4 +83,27 @@
         android:layout_marginTop="24dp"
         app:layout_constraintStart_toEndOf="@+id/button8"
         app:layout_constraintTop_toBottomOf="@+id/editText_Bundle" />
+
+    <TextView
+        android:id="@+id/textView10"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="返回:"
+        app:layout_constraintBottom_toTopOf="@+id/button_finish"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/button8"
+        app:layout_constraintVertical_bias="0.32999998" />
+
+    <TextView
+        android:id="@+id/textView_back"
+        android:layout_width="300dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:gravity="center"
+        android:text="No Data"
+        android:textSize="24sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/textView10" />
 </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/activity_main5.xml b/app/src/main/res/layout/activity_main5.xml
@@ -6,6 +6,17 @@
     android:layout_height="match_parent"
     tools:context=".Main5Activity">
 
+    <TextView
+        android:id="@+id/textView12"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="2dp"
+        android:layout_marginEnd="2dp"
+        android:layout_marginRight="2dp"
+        android:text="@string/moeyuuko"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
     <TextView
         android:id="@+id/textView6"
         android:layout_width="wrap_content"
@@ -60,4 +71,27 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/PutExtra_textView_get" />
 
+    <EditText
+        android:id="@+id/EditText_re"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:ems="10"
+        android:gravity="center"
+        android:inputType="textPersonName"
+        android:text="返回的数据"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/Bundle_textView_get" />
+
+    <Button
+        android:id="@+id/Button_re"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="返回"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/EditText_re" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>