Why is it light when the API is old?

// Load and set music
p=MediaPlayer.create(getApplicationContext(), R.raw.s_m_map01);
p.setLooping(true); // Continuous playback ON
p.setVolume (0.4f, 0.4f);

// Sound effects settings
sp=new SoundPool(3,AudioManager.STREAM_MUSIC,0);
sound_id[0] = sp.load(this, R.raw.s_s_map00,1);
sound_id[1] = sp.load(this, R.raw.s_s_map01,1);
sound_id[2] = sp.load(this, R.raw.s_s_map02,1);

// Periodic Run Start (Basic 0.175 seconds)
timer.schedule(anim,0L,175L);



// Run every 0.175 seconds*************************************
TimerTaskanim=new TimerTask(){
    public void run() {
        if(App.power==0&power_0==true){
            power_0=false;
         } else {
            power_0 = true; // Once power is lost, it will be processed twice

            if(kyara_i_t!=0){
                // Go to run animation or running -------------------------
                hdl.post(newkyara_i_jikkou()); // Go Run
                } else if ((ImageView) findViewById(R.id.map_b1)).isPressed()||(ImageView) findViewById(R.id.map_b2)).isPressed()|(ImageView) findViewById(R.id.map_b3)).isPressed()|(ImageView) findViewById(R.id.map_b3)).isPressed(ap)|((ImageView) findView_By(mapId( .))
                // If the key is pressed for a long time without moving -----------------------------
                if(input==1){
                    kyara_i_t=1;
                    if(((ImageView)findViewById(R.id.map_b1)).isPressed())kyara_i=1;
                    if(((ImageView)findViewById(R.id.map_b2)).isPressed())kyara_i=2;
                    if(((ImageView)findViewById(R.id.map_b3)).isPressed())kyara_i=3;
                    if(((ImageView)findViewById(R.id.map_b4)).isPressed())kyara_i=4;
                    hdl.post(newkyara_i_jikkou()); // Go Run
                }
            } else{
                // If nothing has been done, step-by-step ---------------------
                hdl.post(newkyara_anim()); // Stepping
                }
            }
        }
    };

// Execute character animation (step) ********************************************************************************************************
    class kyara_animplementations Runnable {
        public void run() {
            // Change to character foot image
            inti;
            kyara_anim++;
            if(kyara_anim==5)kyara_anim=1;
            if(kyara_anim==4)i=2;
            else i=kyara_anim;

            img_id = "kyara";
            img_file="kyara_"+kyara_no+"_"+kyara_m+"_"+i;
            img_img(img_file, img_id);
        }
    }

private void img_img(String img_file2, String img_id2){
        // Image change img (image data, which name?) **************************************************************************************************************************************************
        String[]stArrayData=img_file2.split("\\.");
        intmon_id = getResources().getIdentifier(stArrayData[0], "drawable", getPackageName()); // Retrieve resources

        String[]stArrayData2 = img_id2.split("\\.");
        intmon_id2=getResources().getIdentifier(stArrayData2[0], "id", getPackageName()); // Retrieve resources

        ((ImageView) findViewById(mon_id2)).setImageResource(mon_id);
    }

buildscript{
    repositories {
        jcenter()
    }
    dependencies {
        classpath'com.android.tools.build:gradle:2.0.0'
        // NOTE: Do not place your application dependencies here; they Belong
        // in the individual module build.gradle files
    }
}
allprojects {
    repositories {
        jcenter()
    }
}
task clean (type: Delete) {
    delete rootProject.buildDir
}

apply plugin: 'com.android.application'

android{android{
    compileSdkVersion23
    buildToolsVersion "23.0.3"

    defaultConfig {
        applicationId "***********************"
        minSdkVersion15
        targetSdkVersion23
        versionCode1
        versionName "1.0"
    }
    buildTypes {
        release {
            miniEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    // addition
    applicationVariants.all {variant->
        if(variant.buildType.name.equals("release"){
            variant.outputs.each {output->
                if(output.outputFile!=null
                        &output.outputFile.name.endsWith('.apk'){
                    // Change the .apk name replacement newName as needed
                    defaultversionName = defaultConfig.versionName
                    def newName="vs_v${versionName}.apk"
                    output.outputFile=newFile(output.outputFile.parent, newName)
                }
            }
        }
    }
}

dependencies {
    compilefileTree (dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile'com.android.support:appcompat-v7:23.3.0'
    compile'com.google.android.gms:play-services-ads:7.5.0'
    compile'com.google.code.gson:gson:2.4'
}