《Android系统学习》之JAVA与C混合编程——JNI
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一、APK编写
1.Android.mk
LOCAL_PATH:= $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE_TAGS := optional LOCAL_SRC_FILES := $(call all-subdir-java-files) LOCAL_PACKAGE_NAME := Hello include $(BUILD_PACKAGE)2.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hello.jnitest"
android:versionCode="1"
android:versionName="1.0">
<application
android:icon="@drawable/icon"
android:label="Bug Report Sender" >
<activity android:name=".Hello"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest> 3.src/com/hello/jnitest/Hello.java
package com.hello.jnitest;
import com.hello.jnitest.R;
//jni
import com.tank.common.Inputproc;
//end
import android.app.Activity;
import android.os.Bundle;
import android.os.RemoteException;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class Hello extends Activity implements OnClickListener {
private final static String LOG_TAG = "com.hello.jnitest";
private EditText valueText = null;
private Button relButton = null;
private Button clearrelButton = null;
private Button focusButton = null;
private Button clearfocusButton = null;
private Button writeprocButton = null;
private Button cleartestButton = null;
//jni
private Inputproc test = null;
//end
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
valueText = (EditText)findViewById(R.id.edit_value);
relButton = (Button)findViewById(R.id.button_rel);
clearrelButton = (Button)findViewById(R.id.button_clearrel);
focusButton = (Button)findViewById(R.id.button_focus);
clearfocusButton = (Button)findViewById(R.id.button_clearfocus);
writeprocButton = (Button)findViewById(R.id.button_writeproc);
cleartestButton = (Button)findViewById(R.id.button_cleartest);
relButton.setOnClickListener(this);
clearrelButton.setOnClickListener(this);
focusButton.setOnClickListener(this);
clearfocusButton.setOnClickListener(this);
writeprocButton.setOnClickListener(this);
cleartestButton.setOnClickListener(this);
//jni
test = new Inputproc();
//end
}
@Override
public void onClick(View v) {
if(v.equals(relButton)) {
//jni
setTitle("The Native Add Result is "+String.valueOf(test.changesinglemod(0)));
//end
}
else if(v.equals(clearrelButton)) {
//jni
setTitle("The Native Add Result is "+String.valueOf(test.changesinglemod(1)));
//end
}
else if(v.equals(focusButton)) {
//jni
setTitle("The Native Add Result is "+String.valueOf(test.changesinglemod(2)));
//end
}
else if(v.equals(clearfocusButton)) {
//jni
setTitle("The Native Add Result is "+String.valueOf(test.changesinglemod(3)));
//end
}
else if(v.equals(writeprocButton)) {
//jni
//String text = valueText.getText().toString();
String text = "0;0;102;1";
setTitle("The Native Add Result is "+String.valueOf(test.input_event_in(text)));
String text1 = "0;0;102;0";
setTitle("The Native Add Result is "+String.valueOf(test.input_event_in(text1)));
//end
}
else if(v.equals(cleartestButton)) {
String text = "";
valueText.setText(text);
}
}
}4.src/com/tank/common/Inputproc.java
package com.tank.common;
public class Inputproc {
static {
System.loadLibrary("inputproc_jni");
}
public native int changesinglemod(int a);
public native int input_event_in(String a);
}
5.res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/value">
</TextView>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/edit_value"
android:hint="@string/hint">
</EditText>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">
<Button
android:id="@+id/button_rel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/rel">
</Button>
<Button
android:id="@+id/button_clearrel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/clearrel">
</Button>
<Button
android:id="@+id/button_focus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/focus">
</Button>
<Button
android:id="@+id/button_clearfocus"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/clearfocus">
</Button>
<Button
android:id="@+id/button_writeproc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/writeproc">
</Button>
<Button
android:id="@+id/button_cleartest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/cleartest">
</Button>
</LinearLayout>
</LinearLayout>
6.res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Hello</string>
<string name="value">Value</string>
<string name="hint">Please input a value...</string>
<string name="rel">relmod</string>
<string name="clearrel">relmodclose</string>
<string name="focus">focusmod</string>
<string name="clearfocus">focusmodclose</string>
<string name="writeproc">Writeproc</string>
<string name="cleartest">Cleartest</string>
</resources>7.res/drawable-mdpi/和res/drawable-hdpi下放图片。
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1.Android.mk
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_PRELINK_MODULE := false LOCAL_SRC_FILES := \ com_tank_common_Inputproc.cpp \ inputproc.cpp LOCAL_SHARED_LIBRARIES := \ libandroid_runtime \ libutils LOCAL_MODULE := libinputproc_jni LOCAL_MODULE_TAGS := optional include $(BUILD_SHARED_LIBRARY)2.com_tank_common_Inputproc.cpp
#define LOG_TAG "changemod-JNI"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include "inputproc.h"
///
static jint com_tank_common_Inputproc_changesinglemod(JNIEnv *env, jobject obj, jint a){
switch(a){
case 0:{
changesinglemod(34); //pipe 0
break;
}
case 1:{
changesinglemod(35); //pipe 1
break;
}
case 2:{
changesinglemod(36); //pipe 2
break;
}
case 3:{
changesinglemod(37); //pipe 3
break;
}
}
return 0;
}
static jint com_tank_common_Inputproc_input_event_in(JNIEnv *env, jobject obj, jstring a){
char buf[128];
const char* str = env->GetStringUTFChars(a,NULL);
LOGD("str is %s\n",str);
strcpy(buf,str);
LOGD("buf is %s",buf);
input_event_in(buf);
env->ReleaseStringUTFChars(a,str);
return 0;
}
///
static JNINativeMethod gMethods[] = {
{"changesinglemod", "(I)I", (void *)com_tank_common_Inputproc_changesinglemod},
{"input_event_in", "(Ljava/lang/String;)I", (void *)com_tank_common_Inputproc_input_event_in},
};
static int register_Inputproc(JNIEnv *env){
return android::AndroidRuntime::registerNativeMethods(env, "com/tank/common/Inputproc", gMethods, NELEM(gMethods));
}
jint JNI_OnLoad(JavaVM *vm, void *reserved){
JNIEnv *env = NULL;
if (vm->GetEnv((void **)&env, JNI_VERSION_1_4) != JNI_OK) {
printf("Error GetEnv\n");
return -1;
}
assert(env != NULL);
if (register_Inputproc(env) < 0) {
printf("register_android_test_hello error.\n");
return -1;
}
return JNI_VERSION_1_4;
}
3.具体实现inputproc.cpp和inputproc.h实现上述两个函数即可。