android显式intent示例 android显式intent|Android

Android 显式 Intent指定要从活动中调用的组件。换句话说，我们可以通过显式 Intent调用android中的另一个活动。
我们还可以使用显式 Intent将信息从一个活动传递到另一个活动。
【android显式intent示例】在这里，我们将看到一个从另一个活动调用一个活动的示例，反之亦然。
Android从另一个活动示例调用一个活动
让我们看一下android显式示例的简单示例，该示例从另一个活动调用一个活动，反之亦然。
activity_main.xml

< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="example.srcmini.com.explicitintent.FirstActivity">< TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="8dp" android:text="First Activity" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.454" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.06" />< Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="392dp" android:onClick="callSecondActivity" android:text="Call second activity" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" />< /android.support.constraint.ConstraintLayout>

ActivityOne类

package example.srcmini.com.explicitintent; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; public class FirstActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_first); } public void callSecondActivity(View view){ Intent i = new Intent(getApplicationContext(), SecondActivity.class); i.putExtra("Value1", "Android By srcmini"); i.putExtra("Value2", "Simple Tutorial"); // Set the request code to any code you like, you can identify the // callback via this code startActivity(i); }}

activitytwo_main.xml

< ?xml version="1.0" encoding="utf-8"?> < android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="example.srcmini.com.explicitintent.SecondActivity">< TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="8dp" android:text="Second Activity" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.454" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_bias="0.06" />< Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="8dp" android:layout_marginStart="8dp" android:layout_marginTop="392dp" android:onClick="callFirstActivity" android:text="Call first activity" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> < /android.support.constraint.ConstraintLayout>

活动类2

package example.srcmini.com.explicitintent; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Toast; public class SecondActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); Bundle extras = getIntent().getExtras(); String value1 = extras.getString("Value1"); String value2 = extras.getString("Value2"); Toast.makeText(getApplicationContext(), "Values are:\n First value: "+value1+ "\n Second Value: "+value2, Toast.LENGTH_LONG).show(); } public void callFirstActivity(View view){ Intent i = new Intent(getApplicationContext(), FirstActivity.class); startActivity(i); }}

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