Two jni call methods in android

 

Today, we have a requirement that we need to call the methods in jni twice in android. This has never been implemented before, so we need to write a demo to practice it.

: Http://www.bkjia.com/uploadfile/2011/1202/20111202032600450.zip

:

 

Code:

Package com. boao;

Import android. app. Activity;

Import android. OS. Bundle;

Import android. widget. TextView;

Public class JniIntActivity extends Activity {

/** Called when the activity is first created .*/

TextView textView;

TextView textView2;

Public static final String libName = "JniInt ";

@ Override

Public void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. main );

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

TextView2 = (TextView) findViewById (R. id. text2 );

// String string = String. valueOf (getSum ());

TextView. setText ("Total number:" + getSum ());

TextView2.setText ("the number is:" + getDate () + "");

}

Static

{

System. loadLibrary (libName );

}

/**

* Obtain the total number.

* @ Return

*/

Public native int getSum ();

/**

* Get Data

* @ Return

*/

Public native int getDate ();

}

 

<? Xml version = "1.0" encoding = "UTF-8"?>

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

Android: orientation = "vertical">

<TextView

Android: id = "@ + id/text"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: text = "@ string/hello"/>

<TextView

Android: id = "@ + id/text2"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: text = "@ string/hello"/>

</LinearLayout>

 

 

LOCAL_PATH: = $ (call my-dir)

Include $ (CLEAR_VARS)

LOCAL_C_INCLUDES: = $ (LOCAL_PATH)/include

LOCAL_LDLIBS + =-L $ (SYSROOT)/usr/lib-llog

 

LOCAL_MODULE: = JniInt

LOCAL_SRC_FILES: = \

JavaCalu. c \

 

Include $ (BUILD_SHARED_LIBRARY)

 

# Include <string. h>

# Include <android/log. h>

# Include <jni. h>

/**

* Call methods in jni

*/

JNIEXPORT jint JNICALL Java_com_boao_JniIntActivity_getSum (JNIEnv * env, jobject thiz ){

Jint I = 0;

I ++;

Return getsum (env, I );

}

Jint getsum (JNIEnv * env, int date ){

Jint I = 1;

For (I = 0; I <10; I ++ ){

Date + = I;

}

Return date;

}

 

JNIEXPORT jint JNICALL Java_com_boao_JniIntActivity_getDate (JNIEnv * env, jobject thiz)

{

Jint I = 10;

Return I;

}

From the column of haojunming